mirror of
https://github.com/openssl/openssl.git
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c5f8713443
Use of the low level RSA functions has been informally discouraged for a long time. We now formally deprecate them. Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11063)
540 lines
18 KiB
C
540 lines
18 KiB
C
/*
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* Copyright 2019 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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* RSA low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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#include <openssl/crypto.h>
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#include <openssl/evp.h>
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#include <openssl/core_numbers.h>
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#include <openssl/core_names.h>
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#include <openssl/rsa.h>
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#include <openssl/params.h>
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#include <openssl/err.h>
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/* Just for SSL_MAX_MASTER_KEY_LENGTH */
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#include <openssl/ssl.h>
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#include "internal/constant_time.h"
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#include "internal/sizes.h"
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#include "crypto/rsa.h"
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#include "prov/providercommonerr.h"
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#include "prov/provider_ctx.h"
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#include "prov/implementations.h"
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#include <stdlib.h>
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static OSSL_OP_asym_cipher_newctx_fn rsa_newctx;
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static OSSL_OP_asym_cipher_encrypt_init_fn rsa_init;
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static OSSL_OP_asym_cipher_encrypt_fn rsa_encrypt;
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static OSSL_OP_asym_cipher_decrypt_init_fn rsa_init;
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static OSSL_OP_asym_cipher_decrypt_fn rsa_decrypt;
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static OSSL_OP_asym_cipher_freectx_fn rsa_freectx;
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static OSSL_OP_asym_cipher_dupctx_fn rsa_dupctx;
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static OSSL_OP_asym_cipher_get_ctx_params_fn rsa_get_ctx_params;
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static OSSL_OP_asym_cipher_gettable_ctx_params_fn rsa_gettable_ctx_params;
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static OSSL_OP_asym_cipher_set_ctx_params_fn rsa_set_ctx_params;
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static OSSL_OP_asym_cipher_settable_ctx_params_fn rsa_settable_ctx_params;
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static OSSL_ITEM padding_item[] = {
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{ RSA_PKCS1_PADDING, "pkcs1" },
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{ RSA_SSLV23_PADDING, "sslv23" },
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{ RSA_NO_PADDING, "none" },
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{ RSA_PKCS1_OAEP_PADDING, "oaep" }, /* Correct spelling first */
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{ RSA_PKCS1_OAEP_PADDING, "oeap" },
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{ RSA_X931_PADDING, "x931" },
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{ RSA_PKCS1_PSS_PADDING, "pss" },
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{ 0, NULL }
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};
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/*
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* What's passed as an actual key is defined by the KEYMGMT interface.
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* We happen to know that our KEYMGMT simply passes RSA structures, so
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* we use that here too.
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*/
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typedef struct {
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OPENSSL_CTX *libctx;
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RSA *rsa;
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int pad_mode;
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/* OAEP message digest */
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EVP_MD *oaep_md;
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/* message digest for MGF1 */
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EVP_MD *mgf1_md;
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/* OAEP label */
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unsigned char *oaep_label;
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size_t oaep_labellen;
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/* TLS padding */
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unsigned int client_version;
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unsigned int alt_version;
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} PROV_RSA_CTX;
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static void *rsa_newctx(void *provctx)
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{
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PROV_RSA_CTX *prsactx = OPENSSL_zalloc(sizeof(PROV_RSA_CTX));
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if (prsactx == NULL)
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return NULL;
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prsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
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return prsactx;
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}
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static int rsa_init(void *vprsactx, void *vrsa)
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{
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PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
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if (prsactx == NULL || vrsa == NULL || !RSA_up_ref(vrsa))
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return 0;
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RSA_free(prsactx->rsa);
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prsactx->rsa = vrsa;
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prsactx->pad_mode = RSA_PKCS1_PADDING;
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return 1;
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}
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static int rsa_encrypt(void *vprsactx, unsigned char *out, size_t *outlen,
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size_t outsize, const unsigned char *in, size_t inlen)
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{
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PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
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int ret;
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if (out == NULL) {
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size_t len = RSA_size(prsactx->rsa);
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if (len == 0) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
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return 0;
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}
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*outlen = len;
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return 1;
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}
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if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
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int rsasize = RSA_size(prsactx->rsa);
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unsigned char *tbuf;
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if ((tbuf = OPENSSL_malloc(rsasize)) == NULL) {
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PROVerr(0, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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if (prsactx->oaep_md == NULL) {
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OPENSSL_free(tbuf);
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prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
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PROVerr(0, ERR_R_INTERNAL_ERROR);
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return 0;
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}
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ret = RSA_padding_add_PKCS1_OAEP_mgf1(tbuf, rsasize, in, inlen,
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prsactx->oaep_label,
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prsactx->oaep_labellen,
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prsactx->oaep_md,
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prsactx->mgf1_md);
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if (!ret) {
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OPENSSL_free(tbuf);
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return 0;
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}
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ret = RSA_public_encrypt(rsasize, tbuf, out, prsactx->rsa,
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RSA_NO_PADDING);
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OPENSSL_free(tbuf);
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} else {
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ret = RSA_public_encrypt(inlen, in, out, prsactx->rsa,
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prsactx->pad_mode);
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}
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/* A ret value of 0 is not an error */
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if (ret < 0)
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return ret;
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*outlen = ret;
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return 1;
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}
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static int rsa_decrypt(void *vprsactx, unsigned char *out, size_t *outlen,
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size_t outsize, const unsigned char *in, size_t inlen)
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{
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PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
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int ret;
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size_t len = RSA_size(prsactx->rsa);
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if (prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
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if (out == NULL) {
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*outlen = SSL_MAX_MASTER_KEY_LENGTH;
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return 1;
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}
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if (outsize < SSL_MAX_MASTER_KEY_LENGTH) {
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ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
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return 0;
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}
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} else {
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if (out == NULL) {
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if (len == 0) {
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ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY);
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return 0;
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}
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*outlen = len;
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return 1;
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}
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if (outsize < len) {
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ERR_raise(ERR_LIB_PROV, PROV_R_BAD_LENGTH);
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return 0;
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}
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}
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if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING
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|| prsactx->pad_mode == RSA_PKCS1_WITH_TLS_PADDING) {
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unsigned char *tbuf;
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if ((tbuf = OPENSSL_malloc(len)) == NULL) {
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PROVerr(0, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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ret = RSA_private_decrypt(inlen, in, tbuf, prsactx->rsa,
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RSA_NO_PADDING);
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/*
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* With no padding then, on success ret should be len, otherwise an
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* error occurred (non-constant time)
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*/
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if (ret != (int)len) {
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OPENSSL_free(tbuf);
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ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_DECRYPT);
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return 0;
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}
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if (prsactx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
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if (prsactx->oaep_md == NULL) {
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prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA-1", NULL);
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if (prsactx->oaep_md == NULL) {
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PROVerr(0, ERR_R_INTERNAL_ERROR);
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return 0;
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}
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}
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ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, outsize, tbuf,
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len, len,
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prsactx->oaep_label,
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prsactx->oaep_labellen,
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prsactx->oaep_md,
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prsactx->mgf1_md);
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} else {
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/* RSA_PKCS1_WITH_TLS_PADDING */
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if (prsactx->client_version <= 0) {
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ERR_raise(ERR_LIB_PROV, PROV_R_BAD_TLS_CLIENT_VERSION);
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return 0;
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}
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ret = rsa_padding_check_PKCS1_type_2_TLS(out, outsize,
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tbuf, len,
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prsactx->client_version,
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prsactx->alt_version);
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}
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OPENSSL_free(tbuf);
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} else {
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ret = RSA_private_decrypt(inlen, in, out, prsactx->rsa,
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prsactx->pad_mode);
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}
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*outlen = constant_time_select_s(constant_time_msb_s(ret), *outlen, ret);
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ret = constant_time_select_int(constant_time_msb(ret), 0, 1);
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return ret;
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}
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static void rsa_freectx(void *vprsactx)
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{
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PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
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RSA_free(prsactx->rsa);
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EVP_MD_free(prsactx->oaep_md);
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EVP_MD_free(prsactx->mgf1_md);
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OPENSSL_free(prsactx);
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}
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static void *rsa_dupctx(void *vprsactx)
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{
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PROV_RSA_CTX *srcctx = (PROV_RSA_CTX *)vprsactx;
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PROV_RSA_CTX *dstctx;
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dstctx = OPENSSL_zalloc(sizeof(*srcctx));
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if (dstctx == NULL)
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return NULL;
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*dstctx = *srcctx;
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if (dstctx->rsa != NULL && !RSA_up_ref(dstctx->rsa)) {
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OPENSSL_free(dstctx);
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return NULL;
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}
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if (dstctx->oaep_md != NULL && !EVP_MD_up_ref(dstctx->oaep_md)) {
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RSA_free(dstctx->rsa);
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OPENSSL_free(dstctx);
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return NULL;
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}
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if (dstctx->mgf1_md != NULL && !EVP_MD_up_ref(dstctx->mgf1_md)) {
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RSA_free(dstctx->rsa);
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EVP_MD_free(dstctx->oaep_md);
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OPENSSL_free(dstctx);
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return NULL;
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}
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return dstctx;
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}
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static int rsa_get_ctx_params(void *vprsactx, OSSL_PARAM *params)
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{
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PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
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OSSL_PARAM *p;
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if (prsactx == NULL || params == NULL)
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return 0;
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p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
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if (p != NULL)
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switch (p->data_type) {
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case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
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if (!OSSL_PARAM_set_int(p, prsactx->pad_mode))
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return 0;
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break;
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case OSSL_PARAM_UTF8_STRING:
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{
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int i;
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const char *word = NULL;
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for (i = 0; padding_item[i].id != 0; i++) {
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if (prsactx->pad_mode == (int)padding_item[i].id) {
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word = padding_item[i].ptr;
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break;
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}
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}
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if (word != NULL) {
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if (!OSSL_PARAM_set_utf8_string(p, word))
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return 0;
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} else {
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ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
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}
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}
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break;
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default:
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return 0;
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}
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p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
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if (p != NULL && !OSSL_PARAM_set_utf8_string(p, prsactx->oaep_md == NULL
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? ""
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: EVP_MD_name(prsactx->oaep_md)))
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return 0;
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p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
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if (p != NULL) {
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EVP_MD *mgf1_md = prsactx->mgf1_md == NULL ? prsactx->oaep_md
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: prsactx->mgf1_md;
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if (!OSSL_PARAM_set_utf8_string(p, mgf1_md == NULL
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? ""
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: EVP_MD_name(mgf1_md)))
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return 0;
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}
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p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
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if (p != NULL && !OSSL_PARAM_set_octet_ptr(p, prsactx->oaep_label, 0))
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return 0;
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p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN);
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if (p != NULL && !OSSL_PARAM_set_size_t(p, prsactx->oaep_labellen))
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return 0;
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p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
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if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->client_version))
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return 0;
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p = OSSL_PARAM_locate(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
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if (p != NULL && !OSSL_PARAM_set_uint(p, prsactx->alt_version))
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return 0;
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return 1;
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}
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static const OSSL_PARAM known_gettable_ctx_params[] = {
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OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
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OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
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OSSL_PARAM_DEFN(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, OSSL_PARAM_OCTET_PTR,
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NULL, 0),
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OSSL_PARAM_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN, NULL),
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OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
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OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *rsa_gettable_ctx_params(void)
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{
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return known_gettable_ctx_params;
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}
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static int rsa_set_ctx_params(void *vprsactx, const OSSL_PARAM params[])
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{
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PROV_RSA_CTX *prsactx = (PROV_RSA_CTX *)vprsactx;
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const OSSL_PARAM *p;
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char mdname[OSSL_MAX_NAME_SIZE];
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char mdprops[OSSL_MAX_PROPQUERY_SIZE] = { '\0' };
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char *str = mdname;
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if (prsactx == NULL || params == NULL)
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return 0;
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p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST);
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if (p != NULL) {
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if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
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return 0;
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str = mdprops;
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p = OSSL_PARAM_locate_const(params,
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OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS);
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if (p != NULL) {
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if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
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return 0;
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}
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EVP_MD_free(prsactx->oaep_md);
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prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, mdname, mdprops);
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if (prsactx->oaep_md == NULL)
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return 0;
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}
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p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_PAD_MODE);
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if (p != NULL) {
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int pad_mode = 0;
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switch (p->data_type) {
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case OSSL_PARAM_INTEGER: /* Support for legacy pad mode number */
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if (!OSSL_PARAM_get_int(p, &pad_mode))
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return 0;
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break;
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case OSSL_PARAM_UTF8_STRING:
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{
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int i;
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if (p->data == NULL)
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return 0;
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for (i = 0; padding_item[i].id != 0; i++) {
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if (strcmp(p->data, padding_item[i].ptr) == 0) {
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pad_mode = padding_item[i].id;
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break;
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}
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}
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}
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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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* PSS padding is for signatures only so is not compatible with
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* asymmetric cipher use.
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*/
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if (pad_mode == RSA_PKCS1_PSS_PADDING)
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return 0;
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if (pad_mode == RSA_PKCS1_OAEP_PADDING && prsactx->oaep_md == NULL) {
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prsactx->oaep_md = EVP_MD_fetch(prsactx->libctx, "SHA1", mdprops);
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if (prsactx->oaep_md == NULL)
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return 0;
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}
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prsactx->pad_mode = pad_mode;
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}
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p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST);
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if (p != NULL) {
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if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdname)))
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return 0;
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str = mdprops;
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p = OSSL_PARAM_locate_const(params,
|
|
OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS);
|
|
if (p != NULL) {
|
|
if (!OSSL_PARAM_get_utf8_string(p, &str, sizeof(mdprops)))
|
|
return 0;
|
|
} else {
|
|
str = NULL;
|
|
}
|
|
|
|
EVP_MD_free(prsactx->mgf1_md);
|
|
prsactx->mgf1_md = EVP_MD_fetch(prsactx->libctx, mdname, str);
|
|
|
|
if (prsactx->mgf1_md == NULL)
|
|
return 0;
|
|
}
|
|
|
|
p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL);
|
|
if (p != NULL) {
|
|
void *tmp_label = NULL;
|
|
size_t tmp_labellen;
|
|
|
|
if (!OSSL_PARAM_get_octet_string(p, &tmp_label, 0, &tmp_labellen))
|
|
return 0;
|
|
OPENSSL_free(prsactx->oaep_label);
|
|
prsactx->oaep_label = (unsigned char *)tmp_label;
|
|
prsactx->oaep_labellen = tmp_labellen;
|
|
}
|
|
|
|
p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION);
|
|
if (p != NULL) {
|
|
unsigned int client_version;
|
|
|
|
if (!OSSL_PARAM_get_uint(p, &client_version))
|
|
return 0;
|
|
prsactx->client_version = client_version;
|
|
}
|
|
|
|
p = OSSL_PARAM_locate_const(params, OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION);
|
|
if (p != NULL) {
|
|
unsigned int alt_version;
|
|
|
|
if (!OSSL_PARAM_get_uint(p, &alt_version))
|
|
return 0;
|
|
prsactx->alt_version = alt_version;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static const OSSL_PARAM known_settable_ctx_params[] = {
|
|
OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST, NULL, 0),
|
|
OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, NULL, 0),
|
|
OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST, NULL, 0),
|
|
OSSL_PARAM_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS, NULL, 0),
|
|
OSSL_PARAM_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL, NULL, 0),
|
|
OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION, NULL),
|
|
OSSL_PARAM_uint(OSSL_ASYM_CIPHER_PARAM_TLS_NEGOTIATED_VERSION, NULL),
|
|
OSSL_PARAM_END
|
|
};
|
|
|
|
static const OSSL_PARAM *rsa_settable_ctx_params(void)
|
|
{
|
|
return known_settable_ctx_params;
|
|
}
|
|
|
|
const OSSL_DISPATCH rsa_asym_cipher_functions[] = {
|
|
{ OSSL_FUNC_ASYM_CIPHER_NEWCTX, (void (*)(void))rsa_newctx },
|
|
{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT, (void (*)(void))rsa_init },
|
|
{ OSSL_FUNC_ASYM_CIPHER_ENCRYPT, (void (*)(void))rsa_encrypt },
|
|
{ OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT, (void (*)(void))rsa_init },
|
|
{ OSSL_FUNC_ASYM_CIPHER_DECRYPT, (void (*)(void))rsa_decrypt },
|
|
{ OSSL_FUNC_ASYM_CIPHER_FREECTX, (void (*)(void))rsa_freectx },
|
|
{ OSSL_FUNC_ASYM_CIPHER_DUPCTX, (void (*)(void))rsa_dupctx },
|
|
{ OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS,
|
|
(void (*)(void))rsa_get_ctx_params },
|
|
{ OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS,
|
|
(void (*)(void))rsa_gettable_ctx_params },
|
|
{ OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS,
|
|
(void (*)(void))rsa_set_ctx_params },
|
|
{ OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS,
|
|
(void (*)(void))rsa_settable_ctx_params },
|
|
{ 0, NULL }
|
|
};
|