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boringssl/crypto/evp/p_rsa.c
Adam Langley 5129e2d695 Align EVP return values with BoringSSL convention. 
Where possible, functions should return one for success and zero for
error. The use of additional negative values to indicate an error is,
itself, error prone.

This change fixes many EVP functions to remove the possibility of
negative return values. Existing code that is testing for <= 0 will
continue to function, although there is the possibility that some code
was differentiating between negative values (error) and zero (invalid
signature) for the verify functions and will now show the wrong error
message.

Change-Id: I982512596bb18a82df65861394dbd7487783bd3d
Reviewed-on: https://boringssl-review.googlesource.com/1333
Reviewed-by: Adam Langley <agl@google.com>
2014-07-29 21:47:51 +00:00

597 lines
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2006.
*/
/* ====================================================================
* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com). */
#include <openssl/evp.h>
#include <openssl/bn.h>
#include <openssl/buf.h>
#include <openssl/digest.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/rsa.h>
#include "../rsa/internal.h"
#include "internal.h"
typedef struct {
/* Key gen parameters */
int nbits;
BIGNUM *pub_exp;
/* RSA padding mode */
int pad_mode;
/* message digest */
const EVP_MD *md;
/* message digest for MGF1 */
const EVP_MD *mgf1md;
/* PSS salt length */
int saltlen;
/* tbuf is a buffer which is either NULL, or is the size of the RSA modulus.
* It's used to store the output of RSA operations. */
uint8_t *tbuf;
/* OAEP label */
uint8_t *oaep_label;
size_t oaep_labellen;
} RSA_PKEY_CTX;
static int pkey_rsa_init(EVP_PKEY_CTX *ctx) {
RSA_PKEY_CTX *rctx;
rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
if (!rctx) {
return 0;
}
memset(rctx, 0, sizeof(RSA_PKEY_CTX));
rctx->nbits = 2048;
rctx->pad_mode = RSA_PKCS1_PADDING;
rctx->saltlen = -2;
ctx->data = rctx;
return 1;
}
static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) {
RSA_PKEY_CTX *dctx, *sctx;
if (!pkey_rsa_init(dst)) {
return 0;
}
sctx = src->data;
dctx = dst->data;
dctx->nbits = sctx->nbits;
if (sctx->pub_exp) {
dctx->pub_exp = BN_dup(sctx->pub_exp);
if (!dctx->pub_exp) {
return 0;
}
}
dctx->pad_mode = sctx->pad_mode;
dctx->md = sctx->md;
dctx->mgf1md = sctx->mgf1md;
if (sctx->oaep_label) {
if (dctx->oaep_label) {
OPENSSL_free(dctx->oaep_label);
}
dctx->oaep_label = BUF_memdup(sctx->oaep_label, sctx->oaep_labellen);
if (!dctx->oaep_label) {
return 0;
}
dctx->oaep_labellen = sctx->oaep_labellen;
}
return 1;
}
static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx) {
RSA_PKEY_CTX *rctx = ctx->data;
if (rctx == NULL) {
return;
}
if (rctx->pub_exp) {
BN_free(rctx->pub_exp);
}
if (rctx->tbuf) {
OPENSSL_free(rctx->tbuf);
}
if (rctx->oaep_label) {
OPENSSL_free(rctx->oaep_label);
}
OPENSSL_free(rctx);
}
static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk) {
if (ctx->tbuf) {
return 1;
}
ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
if (!ctx->tbuf) {
return 0;
}
return 1;
}
static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *siglen,
const uint8_t *tbs, size_t tbslen) {
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
const size_t key_len = EVP_PKEY_size(ctx->pkey);
if (!sig) {
*siglen = key_len;
return 1;
}
if (*siglen < key_len) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_sign, EVP_R_BUFFER_TOO_SMALL);
return 0;
}
if (rctx->md) {
unsigned int out_len;
if (tbslen != EVP_MD_size(rctx->md)) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_sign, EVP_R_INVALID_DIGEST_LENGTH);
return 0;
}
if (EVP_MD_type(rctx->md) == NID_mdc2) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_sign, EVP_R_NO_MDC2_SUPPORT);
return 0;
}
switch (rctx->pad_mode) {
case RSA_PKCS1_PADDING:
if (!RSA_sign(EVP_MD_type(rctx->md), tbs, tbslen, sig, &out_len, rsa)) {
return 0;
}
*siglen = out_len;
return 1;
case RSA_PKCS1_PSS_PADDING:
if (!setup_tbuf(rctx, ctx) ||
!RSA_padding_add_PKCS1_PSS_mgf1(rsa, rctx->tbuf, tbs, rctx->md,
rctx->mgf1md, rctx->saltlen) ||
!RSA_encrypt(rsa, siglen, sig, *siglen, rctx->tbuf, key_len,
RSA_NO_PADDING)) {
return 0;
}
return 1;
default:
return 0;
}
}
return RSA_sign_raw(rsa, siglen, sig, *siglen, tbs, tbslen, rctx->pad_mode);
}
static int pkey_rsa_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig,
size_t siglen, const uint8_t *tbs,
size_t tbslen) {
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
size_t rslen;
const size_t key_len = EVP_PKEY_size(ctx->pkey);
if (rctx->md) {
switch (rctx->pad_mode) {
case RSA_PKCS1_PADDING:
return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen, sig, siglen, rsa);
case RSA_PKCS1_PSS_PADDING:
if (!setup_tbuf(rctx, ctx) ||
!RSA_verify_raw(rsa, &rslen, rctx->tbuf, key_len, sig, siglen,
RSA_NO_PADDING) ||
!RSA_verify_PKCS1_PSS_mgf1(rsa, tbs, rctx->md, rctx->mgf1md,
rctx->tbuf, rctx->saltlen)) {
return 0;
}
return 1;
default:
return 0;
}
}
if (!setup_tbuf(rctx, ctx) ||
!RSA_verify_raw(rsa, &rslen, rctx->tbuf, key_len, sig, siglen,
rctx->pad_mode) ||
rslen != tbslen ||
CRYPTO_memcmp(tbs, rctx->tbuf, rslen) != 0) {
return 0;
}
return 1;
}
static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx, uint8_t *out, size_t *outlen,
const uint8_t *in, size_t inlen) {
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
const size_t key_len = EVP_PKEY_size(ctx->pkey);
if (!out) {
*outlen = key_len;
return 1;
}
if (*outlen < key_len) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_encrypt, EVP_R_BUFFER_TOO_SMALL);
return 0;
}
if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
if (!setup_tbuf(rctx, ctx) ||
!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, key_len, in, inlen,
rctx->oaep_label, rctx->oaep_labellen,
rctx->md, rctx->mgf1md) ||
!RSA_encrypt(rsa, outlen, out, *outlen, rctx->tbuf, key_len,
RSA_NO_PADDING)) {
return 0;
}
return 1;
}
return RSA_encrypt(rsa, outlen, out, *outlen, in, inlen, rctx->pad_mode);
}
static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx, uint8_t *out,
size_t *outlen, const uint8_t *in,
size_t inlen) {
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
const size_t key_len = EVP_PKEY_size(ctx->pkey);
if (!out) {
*outlen = key_len;
return 1;
}
if (*outlen < key_len) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_decrypt, EVP_R_BUFFER_TOO_SMALL);
return 0;
}
if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
size_t plaintext_len;
int message_len;
if (!setup_tbuf(rctx, ctx) ||
!RSA_decrypt(rsa, &plaintext_len, rctx->tbuf, key_len, in, inlen,
RSA_NO_PADDING)) {
return 0;
}
message_len = RSA_padding_check_PKCS1_OAEP_mgf1(
out, key_len, rctx->tbuf, plaintext_len, rctx->oaep_label,
rctx->oaep_labellen, rctx->md, rctx->mgf1md);
if (message_len < 0) {
return 0;
}
*outlen = message_len;
return 1;
}
return RSA_decrypt(rsa, outlen, out, key_len, in, inlen, rctx->pad_mode);
}
static int check_padding_md(const EVP_MD *md, int padding) {
if (!md) {
return 1;
}
if (padding == RSA_NO_PADDING) {
OPENSSL_PUT_ERROR(EVP, check_padding_md, EVP_R_INVALID_PADDING_MODE);
return 0;
}
return 1;
}
static int is_known_padding(int padding_mode) {
switch (padding_mode) {
case RSA_PKCS1_PADDING:
case RSA_NO_PADDING:
case RSA_PKCS1_OAEP_PADDING:
case RSA_PKCS1_PSS_PADDING:
return 1;
default:
return 0;
}
}
static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) {
RSA_PKEY_CTX *rctx = ctx->data;
switch (type) {
case EVP_PKEY_CTRL_RSA_PADDING:
if (!is_known_padding(p1) || !check_padding_md(rctx->md, p1) ||
(p1 == RSA_PKCS1_PSS_PADDING &&
0 == (ctx->operation & (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY))) ||
(p1 == RSA_PKCS1_OAEP_PADDING &&
0 == (ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_ctrl,
EVP_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return -2;
}
if ((p1 == RSA_PKCS1_PSS_PADDING || p1 == RSA_PKCS1_OAEP_PADDING) &&
rctx->md == NULL) {
rctx->md = EVP_sha1();
}
rctx->pad_mode = p1;
return 1;
case EVP_PKEY_CTRL_GET_RSA_PADDING:
*(int *)p2 = rctx->pad_mode;
return 1;
case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_ctrl, EVP_R_INVALID_PSS_SALTLEN);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
*(int *)p2 = rctx->saltlen;
} else {
if (p1 < -2) {
return -2;
}
rctx->saltlen = p1;
}
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
if (p1 < 256) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_ctrl, EVP_R_INVALID_KEYBITS);
return -2;
}
rctx->nbits = p1;
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
if (!p2) {
return -2;
}
BN_free(rctx->pub_exp);
rctx->pub_exp = p2;
return 1;
case EVP_PKEY_CTRL_RSA_OAEP_MD:
case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_ctrl, EVP_R_INVALID_PADDING_MODE);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD) {
*(const EVP_MD **)p2 = rctx->md;
} else {
rctx->md = p2;
}
return 1;
case EVP_PKEY_CTRL_MD:
if (!check_padding_md(p2, rctx->pad_mode)) {
return 0;
}
rctx->md = p2;
return 1;
case EVP_PKEY_CTRL_GET_MD:
*(const EVP_MD **)p2 = rctx->md;
return 1;
case EVP_PKEY_CTRL_RSA_MGF1_MD:
case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING &&
rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_ctrl, EVP_R_INVALID_MGF1_MD);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
if (rctx->mgf1md) {
*(const EVP_MD **)p2 = rctx->mgf1md;
} else {
*(const EVP_MD **)p2 = rctx->md;
}
} else {
rctx->mgf1md = p2;
}
return 1;
case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_ctrl, EVP_R_INVALID_PADDING_MODE);
return -2;
}
if (rctx->oaep_label) {
OPENSSL_free(rctx->oaep_label);
}
if (p2 && p1 > 0) {
/* TODO(fork): this seems wrong. Shouldn't it take a copy of the
* buffer? */
rctx->oaep_label = p2;
rctx->oaep_labellen = p1;
} else {
rctx->oaep_label = NULL;
rctx->oaep_labellen = 0;
}
return 1;
case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
OPENSSL_PUT_ERROR(EVP, pkey_rsa_ctrl, EVP_R_INVALID_PADDING_MODE);
return -2;
}
*(uint8_t **)p2 = rctx->oaep_label;
return rctx->oaep_labellen;
case EVP_PKEY_CTRL_DIGESTINIT:
return 1;
default:
return -2;
}
}
static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
RSA *rsa = NULL;
RSA_PKEY_CTX *rctx = ctx->data;
if (!rctx->pub_exp) {
rctx->pub_exp = BN_new();
if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
return 0;
}
rsa = RSA_new();
if (!rsa) {
return 0;
}
if (!RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, NULL)) {
RSA_free(rsa);
return 0;
}
EVP_PKEY_assign_RSA(pkey, rsa);
return 1;
}
const EVP_PKEY_METHOD rsa_pkey_meth = {
EVP_PKEY_RSA, 0 /* flags */, pkey_rsa_init,
pkey_rsa_copy, pkey_rsa_cleanup, 0 /* paramgen_init */,
0 /* paramgen */, 0 /* keygen_init */, pkey_rsa_keygen,
0 /* sign_init */, pkey_rsa_sign, 0 /* verify_init */,
pkey_rsa_verify, 0 /* signctx_init */, 0 /* signctx */,
0 /* verifyctx_init */, 0 /* verifyctx */, 0 /* encrypt_init */,
pkey_rsa_encrypt, 0 /* decrypt_init */, pkey_rsa_decrypt,
0 /* derive_init */, 0 /* derive */, pkey_rsa_ctrl,
};
int EVP_PKEY_CTX_set_rsa_padding(EVP_PKEY_CTX *ctx, int padding) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, -1, EVP_PKEY_CTRL_RSA_PADDING,
padding, NULL);
}
int EVP_PKEY_CTX_get_rsa_padding(EVP_PKEY_CTX *ctx, int *out_padding) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, -1, EVP_PKEY_CTRL_GET_RSA_PADDING,
0, out_padding);
}
int EVP_PKEY_CTX_set_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int salt_len) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA,
(EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY),
EVP_PKEY_CTRL_RSA_PSS_SALTLEN, salt_len, NULL);
}
int EVP_PKEY_CTX_get_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int *out_salt_len) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA,
(EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY),
EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN, 0, out_salt_len);
}
int EVP_PKEY_CTX_set_rsa_keygen_bits(EVP_PKEY_CTX *ctx, int bits) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_KEYGEN,
EVP_PKEY_CTRL_RSA_KEYGEN_BITS, bits, NULL);
}
int EVP_PKEY_CTX_set_rsa_keygen_pubexp(EVP_PKEY_CTX *ctx, BIGNUM *e) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_KEYGEN,
EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP, 0, e);
}
int EVP_PKEY_CTX_set_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD *md) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_OAEP_MD, 0, (void *)md);
}
int EVP_PKEY_CTX_get_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD **out_md) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_GET_RSA_OAEP_MD, 0, (void*) out_md);
}
int EVP_PKEY_CTX_set_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD *md) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA,
EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_MGF1_MD, 0, (void*) md);
}
int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD **out_md) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA,
EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_GET_RSA_MGF1_MD, 0, (void*) out_md);
}
int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, const uint8_t *label,
size_t label_len) {
int label_len_int = label_len;
if (((size_t) label_len_int) != label_len) {
return -2;
}
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_OAEP_LABEL, label_len,
(void *)label);
}
int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx,
const uint8_t **out_label) {
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL, 0, (void *) out_label);
}
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