mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
d05105665f
Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8888)
1172 lines
33 KiB
C
1172 lines
33 KiB
C
/*
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* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <assert.h>
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#include "internal/cryptlib.h"
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/rand.h>
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#include <openssl/rand_drbg.h>
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#include <openssl/engine.h>
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#include <openssl/params.h>
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#include <openssl/core_names.h>
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#include "internal/evp_int.h"
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#include "internal/provider.h"
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#include "evp_locl.h"
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int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *ctx)
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{
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if (ctx == NULL)
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return 1;
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if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
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goto legacy;
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if (ctx->provctx != NULL) {
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if (ctx->cipher->freectx != NULL)
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ctx->cipher->freectx(ctx->provctx);
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ctx->provctx = NULL;
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}
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if (ctx->fetched_cipher != NULL)
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EVP_CIPHER_meth_free(ctx->fetched_cipher);
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memset(ctx, 0, sizeof(*ctx));
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return 1;
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/* TODO(3.0): Remove legacy code below */
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legacy:
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if (ctx->cipher != NULL) {
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if (ctx->cipher->cleanup && !ctx->cipher->cleanup(ctx))
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return 0;
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/* Cleanse cipher context data */
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if (ctx->cipher_data && ctx->cipher->ctx_size)
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OPENSSL_cleanse(ctx->cipher_data, ctx->cipher->ctx_size);
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}
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OPENSSL_free(ctx->cipher_data);
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#ifndef OPENSSL_NO_ENGINE
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ENGINE_finish(ctx->engine);
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#endif
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memset(ctx, 0, sizeof(*ctx));
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return 1;
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}
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EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
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{
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return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
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}
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void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
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{
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EVP_CIPHER_CTX_reset(ctx);
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OPENSSL_free(ctx);
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}
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int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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const unsigned char *key, const unsigned char *iv, int enc)
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{
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if (cipher != NULL)
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EVP_CIPHER_CTX_reset(ctx);
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return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
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}
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int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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ENGINE *impl, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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EVP_CIPHER *provciph = NULL;
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ENGINE *tmpimpl = NULL;
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const EVP_CIPHER *tmpcipher;
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/*
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* enc == 1 means we are encrypting.
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* enc == 0 means we are decrypting.
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* enc == -1 means, use the previously initialised value for encrypt/decrypt
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*/
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if (enc == -1) {
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enc = ctx->encrypt;
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} else {
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if (enc)
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enc = 1;
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ctx->encrypt = enc;
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}
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if (cipher == NULL && ctx->cipher == NULL) {
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
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return 0;
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}
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/* TODO(3.0): Legacy work around code below. Remove this */
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#ifndef OPENSSL_NO_ENGINE
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/*
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* Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
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* this context may already have an ENGINE! Try to avoid releasing the
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* previous handle, re-querying for an ENGINE, and having a
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* reinitialisation, when it may all be unnecessary.
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*/
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if (ctx->engine && ctx->cipher
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&& (cipher == NULL || cipher->nid == ctx->cipher->nid))
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goto skip_to_init;
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if (cipher != NULL && impl == NULL) {
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/* Ask if an ENGINE is reserved for this job */
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tmpimpl = ENGINE_get_cipher_engine(cipher->nid);
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}
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#endif
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/*
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* If there are engines involved then we should use legacy handling for now.
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*/
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if (ctx->engine != NULL
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|| impl != NULL
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|| tmpimpl != NULL) {
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if (ctx->cipher == ctx->fetched_cipher)
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ctx->cipher = NULL;
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EVP_CIPHER_meth_free(ctx->fetched_cipher);
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ctx->fetched_cipher = NULL;
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goto legacy;
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}
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tmpcipher = (cipher == NULL) ? ctx->cipher : cipher;
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if (tmpcipher->prov == NULL) {
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switch(tmpcipher->nid) {
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case NID_aes_256_ecb:
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case NID_aes_192_ecb:
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case NID_aes_128_ecb:
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case NID_aes_256_cbc:
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case NID_aes_192_cbc:
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case NID_aes_128_cbc:
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case NID_aes_256_ofb128:
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case NID_aes_192_ofb128:
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case NID_aes_128_ofb128:
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case NID_aes_256_cfb128:
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case NID_aes_192_cfb128:
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case NID_aes_128_cfb128:
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case NID_aes_256_cfb1:
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case NID_aes_192_cfb1:
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case NID_aes_128_cfb1:
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case NID_aes_256_cfb8:
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case NID_aes_192_cfb8:
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case NID_aes_128_cfb8:
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case NID_aes_256_ctr:
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case NID_aes_192_ctr:
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case NID_aes_128_ctr:
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break;
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default:
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goto legacy;
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}
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}
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/*
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* Ensure a context left lying around from last time is cleared
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* (legacy code)
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*/
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if (cipher != NULL && ctx->cipher != NULL) {
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OPENSSL_clear_free(ctx->cipher_data, ctx->cipher->ctx_size);
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ctx->cipher_data = NULL;
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}
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/* TODO(3.0): Start of non-legacy code below */
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/* Ensure a context left lying around from last time is cleared */
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if (cipher != NULL && ctx->cipher != NULL) {
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unsigned long flags = ctx->flags;
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EVP_CIPHER_CTX_reset(ctx);
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/* Restore encrypt and flags */
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ctx->encrypt = enc;
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ctx->flags = flags;
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}
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if (cipher != NULL)
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ctx->cipher = cipher;
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else
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cipher = ctx->cipher;
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if (cipher->prov == NULL) {
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provciph = EVP_CIPHER_fetch(NULL, OBJ_nid2sn(cipher->nid), "");
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if (provciph == NULL) {
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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cipher = provciph;
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EVP_CIPHER_meth_free(ctx->fetched_cipher);
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ctx->fetched_cipher = provciph;
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}
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ctx->cipher = cipher;
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if (ctx->provctx == NULL) {
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ctx->provctx = ctx->cipher->newctx(ossl_provider_ctx(cipher->prov));
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if (ctx->provctx == NULL) {
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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}
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if ((ctx->flags & EVP_CIPH_NO_PADDING) != 0) {
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/*
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* If this ctx was already set up for no padding then we need to tell
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* the new cipher about it.
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*/
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if (!EVP_CIPHER_CTX_set_padding(ctx, 0))
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return 0;
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}
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switch (EVP_CIPHER_mode(ctx->cipher)) {
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case EVP_CIPH_CFB_MODE:
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case EVP_CIPH_OFB_MODE:
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case EVP_CIPH_CBC_MODE:
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/* For these modes we remember the original IV for later use */
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if (!ossl_assert(EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->oiv))) {
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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if (iv != NULL)
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memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
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}
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if (enc) {
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if (ctx->cipher->einit == NULL) {
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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return ctx->cipher->einit(ctx->provctx,
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key,
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key == NULL ? 0
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: EVP_CIPHER_CTX_key_length(ctx),
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iv,
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iv == NULL ? 0
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: EVP_CIPHER_CTX_iv_length(ctx));
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}
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if (ctx->cipher->dinit == NULL) {
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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return ctx->cipher->dinit(ctx->provctx,
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key,
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key == NULL ? 0
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: EVP_CIPHER_CTX_key_length(ctx),
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iv,
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iv == NULL ? 0
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: EVP_CIPHER_CTX_iv_length(ctx));
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/* TODO(3.0): Remove legacy code below */
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legacy:
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if (cipher != NULL) {
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/*
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* Ensure a context left lying around from last time is cleared (we
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* previously attempted to avoid this if the same ENGINE and
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* EVP_CIPHER could be used).
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*/
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if (ctx->cipher) {
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unsigned long flags = ctx->flags;
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EVP_CIPHER_CTX_reset(ctx);
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/* Restore encrypt and flags */
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ctx->encrypt = enc;
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ctx->flags = flags;
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}
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#ifndef OPENSSL_NO_ENGINE
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if (impl != NULL) {
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if (!ENGINE_init(impl)) {
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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} else {
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impl = tmpimpl;
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}
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if (impl != NULL) {
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/* There's an ENGINE for this job ... (apparently) */
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const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
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if (c == NULL) {
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/*
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* One positive side-effect of US's export control history,
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* is that we should at least be able to avoid using US
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* misspellings of "initialisation"?
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*/
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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/* We'll use the ENGINE's private cipher definition */
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cipher = c;
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/*
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* Store the ENGINE functional reference so we know 'cipher' came
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* from an ENGINE and we need to release it when done.
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*/
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ctx->engine = impl;
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} else {
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ctx->engine = NULL;
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}
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#endif
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ctx->cipher = cipher;
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if (ctx->cipher->ctx_size) {
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ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
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if (ctx->cipher_data == NULL) {
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ctx->cipher = NULL;
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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} else {
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ctx->cipher_data = NULL;
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}
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ctx->key_len = cipher->key_len;
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/* Preserve wrap enable flag, zero everything else */
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ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
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if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
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if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
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ctx->cipher = NULL;
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
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return 0;
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}
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}
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}
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#ifndef OPENSSL_NO_ENGINE
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skip_to_init:
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#endif
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/* we assume block size is a power of 2 in *cryptUpdate */
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OPENSSL_assert(ctx->cipher->block_size == 1
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|| ctx->cipher->block_size == 8
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|| ctx->cipher->block_size == 16);
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if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
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&& EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
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EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
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return 0;
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}
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if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
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switch (EVP_CIPHER_CTX_mode(ctx)) {
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case EVP_CIPH_STREAM_CIPHER:
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case EVP_CIPH_ECB_MODE:
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break;
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case EVP_CIPH_CFB_MODE:
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case EVP_CIPH_OFB_MODE:
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ctx->num = 0;
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/* fall-through */
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case EVP_CIPH_CBC_MODE:
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OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
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(int)sizeof(ctx->iv));
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if (iv)
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memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
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memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
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break;
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case EVP_CIPH_CTR_MODE:
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ctx->num = 0;
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/* Don't reuse IV for CTR mode */
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if (iv)
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memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
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break;
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default:
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return 0;
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}
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}
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if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
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if (!ctx->cipher->init(ctx, key, iv, enc))
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return 0;
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}
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ctx->buf_len = 0;
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ctx->final_used = 0;
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ctx->block_mask = ctx->cipher->block_size - 1;
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return 1;
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}
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int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
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const unsigned char *in, int inl)
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{
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if (ctx->encrypt)
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return EVP_EncryptUpdate(ctx, out, outl, in, inl);
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else
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return EVP_DecryptUpdate(ctx, out, outl, in, inl);
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}
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int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
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if (ctx->encrypt)
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return EVP_EncryptFinal_ex(ctx, out, outl);
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else
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return EVP_DecryptFinal_ex(ctx, out, outl);
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}
|
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|
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int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
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{
|
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if (ctx->encrypt)
|
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return EVP_EncryptFinal(ctx, out, outl);
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else
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return EVP_DecryptFinal(ctx, out, outl);
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}
|
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|
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int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
|
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const unsigned char *key, const unsigned char *iv)
|
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{
|
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return EVP_CipherInit(ctx, cipher, key, iv, 1);
|
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}
|
|
|
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int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
|
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ENGINE *impl, const unsigned char *key,
|
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const unsigned char *iv)
|
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{
|
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return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
|
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}
|
|
|
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int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
|
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const unsigned char *key, const unsigned char *iv)
|
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{
|
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return EVP_CipherInit(ctx, cipher, key, iv, 0);
|
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}
|
|
|
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int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
|
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ENGINE *impl, const unsigned char *key,
|
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const unsigned char *iv)
|
|
{
|
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return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
|
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}
|
|
|
|
/*
|
|
* According to the letter of standard difference between pointers
|
|
* is specified to be valid only within same object. This makes
|
|
* it formally challenging to determine if input and output buffers
|
|
* are not partially overlapping with standard pointer arithmetic.
|
|
*/
|
|
#ifdef PTRDIFF_T
|
|
# undef PTRDIFF_T
|
|
#endif
|
|
#if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
|
|
/*
|
|
* Then we have VMS that distinguishes itself by adhering to
|
|
* sizeof(size_t)==4 even in 64-bit builds, which means that
|
|
* difference between two pointers might be truncated to 32 bits.
|
|
* In the context one can even wonder how comparison for
|
|
* equality is implemented. To be on the safe side we adhere to
|
|
* PTRDIFF_T even for comparison for equality.
|
|
*/
|
|
# define PTRDIFF_T uint64_t
|
|
#else
|
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# define PTRDIFF_T size_t
|
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#endif
|
|
|
|
int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
|
|
{
|
|
PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
|
|
/*
|
|
* Check for partially overlapping buffers. [Binary logical
|
|
* operations are used instead of boolean to minimize number
|
|
* of conditional branches.]
|
|
*/
|
|
int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
|
|
(diff > (0 - (PTRDIFF_T)len)));
|
|
|
|
return overlapped;
|
|
}
|
|
|
|
static int evp_EncryptDecryptUpdate(EVP_CIPHER_CTX *ctx,
|
|
unsigned char *out, int *outl,
|
|
const unsigned char *in, int inl)
|
|
{
|
|
int i, j, bl, cmpl = inl;
|
|
|
|
if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
|
|
cmpl = (cmpl + 7) / 8;
|
|
|
|
bl = ctx->cipher->block_size;
|
|
|
|
if (inl <= 0) {
|
|
*outl = 0;
|
|
return inl == 0;
|
|
}
|
|
|
|
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
|
|
/* If block size > 1 then the cipher will have to do this check */
|
|
if (bl == 1 && is_partially_overlapping(out, in, cmpl)) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
|
|
return 0;
|
|
}
|
|
|
|
i = ctx->cipher->do_cipher(ctx, out, in, inl);
|
|
if (i < 0)
|
|
return 0;
|
|
else
|
|
*outl = i;
|
|
return 1;
|
|
}
|
|
|
|
if (is_partially_overlapping(out + ctx->buf_len, in, cmpl)) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTDECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
|
|
return 0;
|
|
}
|
|
|
|
if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
|
|
if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
|
|
*outl = inl;
|
|
return 1;
|
|
} else {
|
|
*outl = 0;
|
|
return 0;
|
|
}
|
|
}
|
|
i = ctx->buf_len;
|
|
OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
|
|
if (i != 0) {
|
|
if (bl - i > inl) {
|
|
memcpy(&(ctx->buf[i]), in, inl);
|
|
ctx->buf_len += inl;
|
|
*outl = 0;
|
|
return 1;
|
|
} else {
|
|
j = bl - i;
|
|
memcpy(&(ctx->buf[i]), in, j);
|
|
inl -= j;
|
|
in += j;
|
|
if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
|
|
return 0;
|
|
out += bl;
|
|
*outl = bl;
|
|
}
|
|
} else
|
|
*outl = 0;
|
|
i = inl & (bl - 1);
|
|
inl -= i;
|
|
if (inl > 0) {
|
|
if (!ctx->cipher->do_cipher(ctx, out, in, inl))
|
|
return 0;
|
|
*outl += inl;
|
|
}
|
|
|
|
if (i != 0)
|
|
memcpy(ctx->buf, &(in[inl]), i);
|
|
ctx->buf_len = i;
|
|
return 1;
|
|
}
|
|
|
|
|
|
int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
|
|
const unsigned char *in, int inl)
|
|
{
|
|
int ret;
|
|
size_t soutl;
|
|
int blocksize;
|
|
|
|
/* Prevent accidental use of decryption context when encrypting */
|
|
if (!ctx->encrypt) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_INVALID_OPERATION);
|
|
return 0;
|
|
}
|
|
|
|
if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
|
|
goto legacy;
|
|
|
|
blocksize = EVP_CIPHER_CTX_block_size(ctx);
|
|
|
|
if (ctx->cipher->cupdate == NULL || blocksize < 1) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
|
|
return 0;
|
|
}
|
|
ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
|
|
inl + (blocksize == 1 ? 0 : blocksize), in,
|
|
(size_t)inl);
|
|
|
|
if (soutl > INT_MAX) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_UPDATE_ERROR);
|
|
return 0;
|
|
}
|
|
*outl = soutl;
|
|
return ret;
|
|
|
|
/* TODO(3.0): Remove legacy code below */
|
|
legacy:
|
|
|
|
return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
|
|
}
|
|
|
|
int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
|
|
{
|
|
int ret;
|
|
ret = EVP_EncryptFinal_ex(ctx, out, outl);
|
|
return ret;
|
|
}
|
|
|
|
int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
|
|
{
|
|
int n, ret;
|
|
unsigned int i, b, bl;
|
|
size_t soutl;
|
|
int blocksize;
|
|
|
|
/* Prevent accidental use of decryption context when encrypting */
|
|
if (!ctx->encrypt) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
|
|
return 0;
|
|
}
|
|
|
|
if (ctx->cipher == NULL) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_NO_CIPHER_SET);
|
|
return 0;
|
|
}
|
|
if (ctx->cipher->prov == NULL)
|
|
goto legacy;
|
|
|
|
blocksize = EVP_CIPHER_CTX_block_size(ctx);
|
|
|
|
if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
|
|
blocksize == 1 ? 0 : blocksize);
|
|
|
|
if (soutl > INT_MAX) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX, EVP_R_FINAL_ERROR);
|
|
return 0;
|
|
}
|
|
*outl = soutl;
|
|
|
|
return ret;
|
|
|
|
/* TODO(3.0): Remove legacy code below */
|
|
legacy:
|
|
|
|
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
|
|
ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
|
|
if (ret < 0)
|
|
return 0;
|
|
else
|
|
*outl = ret;
|
|
return 1;
|
|
}
|
|
|
|
b = ctx->cipher->block_size;
|
|
OPENSSL_assert(b <= sizeof(ctx->buf));
|
|
if (b == 1) {
|
|
*outl = 0;
|
|
return 1;
|
|
}
|
|
bl = ctx->buf_len;
|
|
if (ctx->flags & EVP_CIPH_NO_PADDING) {
|
|
if (bl) {
|
|
EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
|
|
EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
|
|
return 0;
|
|
}
|
|
*outl = 0;
|
|
return 1;
|
|
}
|
|
|
|
n = b - bl;
|
|
for (i = bl; i < b; i++)
|
|
ctx->buf[i] = n;
|
|
ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
|
|
|
|
if (ret)
|
|
*outl = b;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
|
|
const unsigned char *in, int inl)
|
|
{
|
|
int fix_len, cmpl = inl, ret;
|
|
unsigned int b;
|
|
size_t soutl;
|
|
int blocksize;
|
|
|
|
/* Prevent accidental use of encryption context when decrypting */
|
|
if (ctx->encrypt) {
|
|
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_INVALID_OPERATION);
|
|
return 0;
|
|
}
|
|
|
|
if (ctx->cipher == NULL) {
|
|
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_NO_CIPHER_SET);
|
|
return 0;
|
|
}
|
|
if (ctx->cipher->prov == NULL)
|
|
goto legacy;
|
|
|
|
blocksize = EVP_CIPHER_CTX_block_size(ctx);
|
|
|
|
if (ctx->cipher->cupdate == NULL || blocksize < 1) {
|
|
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
|
|
return 0;
|
|
}
|
|
ret = ctx->cipher->cupdate(ctx->provctx, out, &soutl,
|
|
inl + (blocksize == 1 ? 0 : blocksize), in,
|
|
(size_t)inl);
|
|
|
|
if (ret) {
|
|
if (soutl > INT_MAX) {
|
|
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_UPDATE_ERROR);
|
|
return 0;
|
|
}
|
|
*outl = soutl;
|
|
}
|
|
|
|
return ret;
|
|
|
|
/* TODO(3.0): Remove legacy code below */
|
|
legacy:
|
|
|
|
b = ctx->cipher->block_size;
|
|
|
|
if (EVP_CIPHER_CTX_test_flags(ctx, EVP_CIPH_FLAG_LENGTH_BITS))
|
|
cmpl = (cmpl + 7) / 8;
|
|
|
|
if (inl <= 0) {
|
|
*outl = 0;
|
|
return inl == 0;
|
|
}
|
|
|
|
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
|
|
if (b == 1 && is_partially_overlapping(out, in, cmpl)) {
|
|
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
|
|
return 0;
|
|
}
|
|
|
|
fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
|
|
if (fix_len < 0) {
|
|
*outl = 0;
|
|
return 0;
|
|
} else
|
|
*outl = fix_len;
|
|
return 1;
|
|
}
|
|
|
|
if (ctx->flags & EVP_CIPH_NO_PADDING)
|
|
return evp_EncryptDecryptUpdate(ctx, out, outl, in, inl);
|
|
|
|
OPENSSL_assert(b <= sizeof(ctx->final));
|
|
|
|
if (ctx->final_used) {
|
|
/* see comment about PTRDIFF_T comparison above */
|
|
if (((PTRDIFF_T)out == (PTRDIFF_T)in)
|
|
|| is_partially_overlapping(out, in, b)) {
|
|
EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
|
|
return 0;
|
|
}
|
|
memcpy(out, ctx->final, b);
|
|
out += b;
|
|
fix_len = 1;
|
|
} else
|
|
fix_len = 0;
|
|
|
|
if (!evp_EncryptDecryptUpdate(ctx, out, outl, in, inl))
|
|
return 0;
|
|
|
|
/*
|
|
* if we have 'decrypted' a multiple of block size, make sure we have a
|
|
* copy of this last block
|
|
*/
|
|
if (b > 1 && !ctx->buf_len) {
|
|
*outl -= b;
|
|
ctx->final_used = 1;
|
|
memcpy(ctx->final, &out[*outl], b);
|
|
} else
|
|
ctx->final_used = 0;
|
|
|
|
if (fix_len)
|
|
*outl += b;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
|
|
{
|
|
int ret;
|
|
ret = EVP_DecryptFinal_ex(ctx, out, outl);
|
|
return ret;
|
|
}
|
|
|
|
int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
|
|
{
|
|
int i, n;
|
|
unsigned int b;
|
|
size_t soutl;
|
|
int ret;
|
|
int blocksize;
|
|
|
|
/* Prevent accidental use of encryption context when decrypting */
|
|
if (ctx->encrypt) {
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_INVALID_OPERATION);
|
|
return 0;
|
|
}
|
|
|
|
if (ctx->cipher == NULL || ctx->cipher->prov == NULL)
|
|
goto legacy;
|
|
|
|
blocksize = EVP_CIPHER_CTX_block_size(ctx);
|
|
|
|
if (blocksize < 1 || ctx->cipher->cfinal == NULL) {
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
ret = ctx->cipher->cfinal(ctx->provctx, out, &soutl,
|
|
blocksize == 1 ? 0 : blocksize);
|
|
|
|
if (ret) {
|
|
if (soutl > INT_MAX) {
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_FINAL_ERROR);
|
|
return 0;
|
|
}
|
|
*outl = soutl;
|
|
}
|
|
|
|
return ret;
|
|
|
|
/* TODO(3.0): Remove legacy code below */
|
|
legacy:
|
|
|
|
*outl = 0;
|
|
|
|
if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
|
|
i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
|
|
if (i < 0)
|
|
return 0;
|
|
else
|
|
*outl = i;
|
|
return 1;
|
|
}
|
|
|
|
b = ctx->cipher->block_size;
|
|
if (ctx->flags & EVP_CIPH_NO_PADDING) {
|
|
if (ctx->buf_len) {
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
|
|
EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
|
|
return 0;
|
|
}
|
|
*outl = 0;
|
|
return 1;
|
|
}
|
|
if (b > 1) {
|
|
if (ctx->buf_len || !ctx->final_used) {
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
|
|
return 0;
|
|
}
|
|
OPENSSL_assert(b <= sizeof(ctx->final));
|
|
|
|
/*
|
|
* The following assumes that the ciphertext has been authenticated.
|
|
* Otherwise it provides a padding oracle.
|
|
*/
|
|
n = ctx->final[b - 1];
|
|
if (n == 0 || n > (int)b) {
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
|
|
return 0;
|
|
}
|
|
for (i = 0; i < n; i++) {
|
|
if (ctx->final[--b] != n) {
|
|
EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
|
|
return 0;
|
|
}
|
|
}
|
|
n = ctx->cipher->block_size - n;
|
|
for (i = 0; i < n; i++)
|
|
out[i] = ctx->final[i];
|
|
*outl = n;
|
|
} else
|
|
*outl = 0;
|
|
return 1;
|
|
}
|
|
|
|
int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
|
|
{
|
|
if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
|
|
return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
|
|
if (EVP_CIPHER_CTX_key_length(c) == keylen)
|
|
return 1;
|
|
if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
|
|
c->key_len = keylen;
|
|
return 1;
|
|
}
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
|
|
return 0;
|
|
}
|
|
|
|
int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
|
|
{
|
|
if (pad)
|
|
ctx->flags &= ~EVP_CIPH_NO_PADDING;
|
|
else
|
|
ctx->flags |= EVP_CIPH_NO_PADDING;
|
|
|
|
if (ctx->cipher != NULL && ctx->cipher->prov != NULL) {
|
|
OSSL_PARAM params[] = {
|
|
OSSL_PARAM_int(OSSL_CIPHER_PARAM_PADDING, NULL),
|
|
OSSL_PARAM_END
|
|
};
|
|
|
|
params[0].data = &pad;
|
|
|
|
if (ctx->cipher->ctx_set_params == NULL) {
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_SET_PADDING, EVP_R_CTRL_NOT_IMPLEMENTED);
|
|
return 0;
|
|
}
|
|
|
|
if (!ctx->cipher->ctx_set_params(ctx->provctx, params))
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
|
|
{
|
|
int ret;
|
|
|
|
if (!ctx->cipher) {
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
|
|
return 0;
|
|
}
|
|
|
|
if (!ctx->cipher->ctrl) {
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
|
|
return 0;
|
|
}
|
|
|
|
ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
|
|
if (ret == -1) {
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
|
|
EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
|
|
return 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
|
|
{
|
|
int kl;
|
|
if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
|
|
return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
|
|
kl = EVP_CIPHER_CTX_key_length(ctx);
|
|
if (kl <= 0 || RAND_priv_bytes(key, kl) <= 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
|
|
{
|
|
if ((in == NULL) || (in->cipher == NULL)) {
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
|
|
return 0;
|
|
}
|
|
|
|
if (in->cipher->prov == NULL)
|
|
goto legacy;
|
|
|
|
if (in->cipher->dupctx == NULL) {
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
|
|
return 0;
|
|
}
|
|
|
|
EVP_CIPHER_CTX_reset(out);
|
|
|
|
*out = *in;
|
|
out->provctx = NULL;
|
|
|
|
if (in->fetched_cipher != NULL && !EVP_CIPHER_upref(in->fetched_cipher)) {
|
|
out->fetched_cipher = NULL;
|
|
return 0;
|
|
}
|
|
|
|
out->provctx = in->cipher->dupctx(in->provctx);
|
|
if (out->provctx == NULL) {
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_NOT_ABLE_TO_COPY_CTX);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
|
|
/* TODO(3.0): Remove legacy code below */
|
|
legacy:
|
|
|
|
#ifndef OPENSSL_NO_ENGINE
|
|
/* Make sure it's safe to copy a cipher context using an ENGINE */
|
|
if (in->engine && !ENGINE_init(in->engine)) {
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
EVP_CIPHER_CTX_reset(out);
|
|
memcpy(out, in, sizeof(*out));
|
|
|
|
if (in->cipher_data && in->cipher->ctx_size) {
|
|
out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
|
|
if (out->cipher_data == NULL) {
|
|
out->cipher = NULL;
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
|
|
}
|
|
|
|
if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
|
|
if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) {
|
|
out->cipher = NULL;
|
|
EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INITIALIZATION_ERROR);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void *evp_cipher_from_dispatch(int nid, const OSSL_DISPATCH *fns,
|
|
OSSL_PROVIDER *prov)
|
|
{
|
|
EVP_CIPHER *cipher = NULL;
|
|
int fnciphcnt = 0, fnctxcnt = 0;
|
|
|
|
if ((cipher = EVP_CIPHER_meth_new(nid, 0, 0)) == NULL)
|
|
return NULL;
|
|
|
|
for (; fns->function_id != 0; fns++) {
|
|
switch (fns->function_id) {
|
|
case OSSL_FUNC_CIPHER_NEWCTX:
|
|
if (cipher->newctx != NULL)
|
|
break;
|
|
cipher->newctx = OSSL_get_OP_cipher_newctx(fns);
|
|
fnctxcnt++;
|
|
break;
|
|
case OSSL_FUNC_CIPHER_ENCRYPT_INIT:
|
|
if (cipher->einit != NULL)
|
|
break;
|
|
cipher->einit = OSSL_get_OP_cipher_encrypt_init(fns);
|
|
fnciphcnt++;
|
|
break;
|
|
case OSSL_FUNC_CIPHER_DECRYPT_INIT:
|
|
if (cipher->dinit != NULL)
|
|
break;
|
|
cipher->dinit = OSSL_get_OP_cipher_decrypt_init(fns);
|
|
fnciphcnt++;
|
|
break;
|
|
case OSSL_FUNC_CIPHER_UPDATE:
|
|
if (cipher->cupdate != NULL)
|
|
break;
|
|
cipher->cupdate = OSSL_get_OP_cipher_update(fns);
|
|
fnciphcnt++;
|
|
break;
|
|
case OSSL_FUNC_CIPHER_FINAL:
|
|
if (cipher->cfinal != NULL)
|
|
break;
|
|
cipher->cfinal = OSSL_get_OP_cipher_final(fns);
|
|
fnciphcnt++;
|
|
break;
|
|
case OSSL_FUNC_CIPHER_CIPHER:
|
|
if (cipher->ccipher != NULL)
|
|
break;
|
|
cipher->ccipher = OSSL_get_OP_cipher_cipher(fns);
|
|
break;
|
|
case OSSL_FUNC_CIPHER_FREECTX:
|
|
if (cipher->freectx != NULL)
|
|
break;
|
|
cipher->freectx = OSSL_get_OP_cipher_freectx(fns);
|
|
fnctxcnt++;
|
|
break;
|
|
case OSSL_FUNC_CIPHER_DUPCTX:
|
|
if (cipher->dupctx != NULL)
|
|
break;
|
|
cipher->dupctx = OSSL_get_OP_cipher_dupctx(fns);
|
|
break;
|
|
case OSSL_FUNC_CIPHER_KEY_LENGTH:
|
|
if (cipher->key_length != NULL)
|
|
break;
|
|
cipher->key_length = OSSL_get_OP_cipher_key_length(fns);
|
|
break;
|
|
case OSSL_FUNC_CIPHER_IV_LENGTH:
|
|
if (cipher->iv_length != NULL)
|
|
break;
|
|
cipher->iv_length = OSSL_get_OP_cipher_iv_length(fns);
|
|
break;
|
|
case OSSL_FUNC_CIPHER_BLOCK_SIZE:
|
|
if (cipher->blocksize != NULL)
|
|
break;
|
|
cipher->blocksize = OSSL_get_OP_cipher_block_size(fns);
|
|
break;
|
|
case OSSL_FUNC_CIPHER_GET_PARAMS:
|
|
if (cipher->get_params != NULL)
|
|
break;
|
|
cipher->get_params = OSSL_get_OP_cipher_get_params(fns);
|
|
break;
|
|
case OSSL_FUNC_CIPHER_CTX_GET_PARAMS:
|
|
if (cipher->ctx_get_params != NULL)
|
|
break;
|
|
cipher->ctx_get_params = OSSL_get_OP_cipher_ctx_get_params(fns);
|
|
break;
|
|
case OSSL_FUNC_CIPHER_CTX_SET_PARAMS:
|
|
if (cipher->ctx_set_params != NULL)
|
|
break;
|
|
cipher->ctx_set_params = OSSL_get_OP_cipher_ctx_set_params(fns);
|
|
break;
|
|
}
|
|
}
|
|
if ((fnciphcnt != 0 && fnciphcnt != 3 && fnciphcnt != 4)
|
|
|| (fnciphcnt == 0 && cipher->ccipher == NULL)
|
|
|| fnctxcnt != 2
|
|
|| cipher->blocksize == NULL
|
|
|| cipher->iv_length == NULL
|
|
|| cipher->key_length == NULL) {
|
|
/*
|
|
* In order to be a consistent set of functions we must have at least
|
|
* a complete set of "encrypt" functions, or a complete set of "decrypt"
|
|
* functions, or a single "cipher" function. In all cases we need a
|
|
* complete set of context management functions, as well as the
|
|
* blocksize, iv_length and key_length functions.
|
|
*/
|
|
EVP_CIPHER_meth_free(cipher);
|
|
EVPerr(EVP_F_EVP_CIPHER_FROM_DISPATCH, EVP_R_INVALID_PROVIDER_FUNCTIONS);
|
|
return NULL;
|
|
}
|
|
cipher->prov = prov;
|
|
if (prov != NULL)
|
|
ossl_provider_upref(prov);
|
|
|
|
return cipher;
|
|
}
|
|
|
|
static int evp_cipher_upref(void *cipher)
|
|
{
|
|
return EVP_CIPHER_upref(cipher);
|
|
}
|
|
|
|
static void evp_cipher_free(void *cipher)
|
|
{
|
|
EVP_CIPHER_meth_free(cipher);
|
|
}
|
|
|
|
static int evp_cipher_nid(void *vcipher)
|
|
{
|
|
EVP_CIPHER *cipher = vcipher;
|
|
|
|
return cipher->nid;
|
|
}
|
|
|
|
EVP_CIPHER *EVP_CIPHER_fetch(OPENSSL_CTX *ctx, const char *algorithm,
|
|
const char *properties)
|
|
{
|
|
return evp_generic_fetch(ctx, OSSL_OP_CIPHER, algorithm, properties,
|
|
evp_cipher_from_dispatch, evp_cipher_upref,
|
|
evp_cipher_free, evp_cipher_nid);
|
|
}
|