mirror of
https://github.com/openssl/openssl.git
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63ee6ec177
Reviewed-by: Shane Lontis <shane.lontis@oracle.com> (Merged from https://github.com/openssl/openssl/pull/12288)
254 lines
9.3 KiB
C
254 lines
9.3 KiB
C
/*
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* Copyright 2019-2020 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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/*
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* This file uses the low level AES functions (which are deprecated for
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* non-internal use) in order to implement provider AES ciphers.
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*/
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#include "internal/deprecated.h"
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#include "cipher_aes.h"
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#include "prov/providercommonerr.h"
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#include "prov/implementations.h"
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/* AES wrap with padding has IV length of 4, without padding 8 */
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#define AES_WRAP_PAD_IVLEN 4
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#define AES_WRAP_NOPAD_IVLEN 8
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/* TODO(3.0) Figure out what flags need to be passed */
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#define WRAP_FLAGS (EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV \
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| EVP_CIPH_ALWAYS_CALL_INIT)
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typedef size_t (*aeswrap_fn)(void *key, const unsigned char *iv,
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unsigned char *out, const unsigned char *in,
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size_t inlen, block128_f block);
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static OSSL_FUNC_cipher_encrypt_init_fn aes_wrap_einit;
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static OSSL_FUNC_cipher_decrypt_init_fn aes_wrap_dinit;
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static OSSL_FUNC_cipher_update_fn aes_wrap_cipher;
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static OSSL_FUNC_cipher_final_fn aes_wrap_final;
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static OSSL_FUNC_cipher_freectx_fn aes_wrap_freectx;
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typedef struct prov_aes_wrap_ctx_st {
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PROV_CIPHER_CTX base;
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union {
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OSSL_UNION_ALIGN;
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AES_KEY ks;
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} ks;
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aeswrap_fn wrapfn;
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} PROV_AES_WRAP_CTX;
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static void *aes_wrap_newctx(size_t kbits, size_t blkbits,
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size_t ivbits, unsigned int mode, uint64_t flags)
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{
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PROV_AES_WRAP_CTX *wctx = OPENSSL_zalloc(sizeof(*wctx));
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PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)wctx;
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if (ctx != NULL) {
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cipher_generic_initkey(ctx, kbits, blkbits, ivbits, mode, flags,
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NULL, NULL);
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ctx->pad = (ctx->ivlen == AES_WRAP_PAD_IVLEN);
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}
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return wctx;
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}
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static void aes_wrap_freectx(void *vctx)
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{
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PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
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cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
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OPENSSL_clear_free(wctx, sizeof(*wctx));
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}
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static int aes_wrap_init(void *vctx, const unsigned char *key,
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size_t keylen, const unsigned char *iv,
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size_t ivlen, int enc)
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{
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PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
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ctx->enc = enc;
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ctx->block = enc ? (block128_f)AES_encrypt : (block128_f)AES_decrypt;
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if (ctx->pad)
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wctx->wrapfn = enc ? CRYPTO_128_wrap_pad : CRYPTO_128_unwrap_pad;
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else
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wctx->wrapfn = enc ? CRYPTO_128_wrap : CRYPTO_128_unwrap;
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if (iv != NULL) {
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if (!cipher_generic_initiv(ctx, iv, ivlen))
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return 0;
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}
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if (key != NULL) {
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if (keylen != ctx->keylen) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
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return 0;
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}
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if (ctx->enc)
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AES_set_encrypt_key(key, keylen * 8, &wctx->ks.ks);
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else
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AES_set_decrypt_key(key, keylen * 8, &wctx->ks.ks);
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}
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return 1;
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}
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static int aes_wrap_einit(void *ctx, const unsigned char *key, size_t keylen,
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const unsigned char *iv, size_t ivlen)
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{
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return aes_wrap_init(ctx, key, keylen, iv, ivlen, 1);
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}
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static int aes_wrap_dinit(void *ctx, const unsigned char *key, size_t keylen,
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const unsigned char *iv, size_t ivlen)
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{
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return aes_wrap_init(ctx, key, keylen, iv, ivlen, 0);
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}
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static int aes_wrap_cipher_internal(void *vctx, unsigned char *out,
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const unsigned char *in, size_t inlen)
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{
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PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
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size_t rv;
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int pad = ctx->pad;
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/* No final operation so always return zero length */
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if (in == NULL)
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return 0;
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/* Input length must always be non-zero */
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if (inlen == 0)
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return -1;
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/* If decrypting need at least 16 bytes and multiple of 8 */
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if (!ctx->enc && (inlen < 16 || inlen & 0x7))
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return -1;
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/* If not padding input must be multiple of 8 */
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if (!pad && inlen & 0x7)
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return -1;
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if (out == NULL) {
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if (ctx->enc) {
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/* If padding round up to multiple of 8 */
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if (pad)
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inlen = (inlen + 7) / 8 * 8;
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/* 8 byte prefix */
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return inlen + 8;
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} else {
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/*
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* If not padding output will be exactly 8 bytes smaller than
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* input. If padding it will be at least 8 bytes smaller but we
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* don't know how much.
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*/
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return inlen - 8;
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}
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}
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rv = wctx->wrapfn(&wctx->ks.ks, ctx->iv_set ? ctx->iv : NULL, out, in,
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inlen, ctx->block);
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return rv ? (int)rv : -1;
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}
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static int aes_wrap_final(void *vctx, unsigned char *out, size_t *outl,
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size_t outsize)
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{
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*outl = 0;
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return 1;
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}
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static int aes_wrap_cipher(void *vctx,
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unsigned char *out, size_t *outl, size_t outsize,
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const unsigned char *in, size_t inl)
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{
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PROV_AES_WRAP_CTX *ctx = (PROV_AES_WRAP_CTX *)vctx;
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size_t len;
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if (inl == 0) {
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*outl = 0;
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return 1;
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}
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if (outsize < inl) {
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ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
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return -1;
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}
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len = aes_wrap_cipher_internal(ctx, out, in, inl);
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if (len == 0)
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return -1;
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*outl = len;
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return 1;
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}
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static int aes_wrap_set_ctx_params(void *vctx, const OSSL_PARAM params[])
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{
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PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
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const OSSL_PARAM *p;
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size_t keylen = 0;
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p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
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if (p != NULL) {
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if (!OSSL_PARAM_get_size_t(p, &keylen)) {
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
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return 0;
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}
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if (ctx->keylen != keylen) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
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return 0;
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}
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}
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return 1;
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}
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#define IMPLEMENT_cipher(mode, fname, UCMODE, flags, kbits, blkbits, ivbits) \
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static OSSL_FUNC_cipher_get_params_fn aes_##kbits##_##fname##_get_params; \
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static int aes_##kbits##_##fname##_get_params(OSSL_PARAM params[]) \
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{ \
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return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
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flags, kbits, blkbits, ivbits); \
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} \
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static OSSL_FUNC_cipher_newctx_fn aes_##kbits##fname##_newctx; \
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static void *aes_##kbits##fname##_newctx(void *provctx) \
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{ \
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return aes_##mode##_newctx(kbits, blkbits, ivbits, \
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EVP_CIPH_##UCMODE##_MODE, flags); \
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} \
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const OSSL_DISPATCH aes##kbits##fname##_functions[] = { \
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{ OSSL_FUNC_CIPHER_NEWCTX, \
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(void (*)(void))aes_##kbits##fname##_newctx }, \
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{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_##mode##_einit }, \
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{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_##mode##_dinit }, \
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{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_##mode##_cipher }, \
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{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_##mode##_final }, \
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{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_##mode##_freectx }, \
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{ OSSL_FUNC_CIPHER_GET_PARAMS, \
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(void (*)(void))aes_##kbits##_##fname##_get_params }, \
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{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
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(void (*)(void))cipher_generic_gettable_params }, \
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{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
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(void (*)(void))cipher_generic_get_ctx_params }, \
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{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
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(void (*)(void))aes_wrap_set_ctx_params }, \
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{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
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(void (*)(void))cipher_generic_gettable_ctx_params }, \
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{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
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(void (*)(void))cipher_generic_settable_ctx_params }, \
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{ 0, NULL } \
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}
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IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_NOPAD_IVLEN * 8);
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IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_NOPAD_IVLEN * 8);
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IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_NOPAD_IVLEN * 8);
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IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_PAD_IVLEN * 8);
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IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_PAD_IVLEN * 8);
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IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_PAD_IVLEN * 8);
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