fips_rsa_sign.c
/* fips_rsa_sign.c */
/*
* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
* 2007.
*/
/* ====================================================================
* Copyright (c) 2007 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 <string.h>
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/err.h>
#include <openssl/sha.h>
#ifdef OPENSSL_FIPS
/*
* FIPS versions of RSA_sign() and RSA_verify(). These will only have to deal
* with SHA* signatures and by including pregenerated encodings all ASN1
* dependencies can be avoided
*/
/* Standard encodings including NULL parameter */
static const unsigned char sha1_bin[] = {
0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05,
0x00, 0x04, 0x14
};
static const unsigned char sha224_bin[] = {
0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x04, 0x05, 0x00, 0x04, 0x1c
};
static const unsigned char sha256_bin[] = {
0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20
};
static const unsigned char sha384_bin[] = {
0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30
};
static const unsigned char sha512_bin[] = {
0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40
};
/*
* Alternate encodings with absent parameters. We don't generate signature
* using this format but do tolerate received signatures of this form.
*/
static unsigned char sha1_nn_bin[] = {
0x30, 0x1f, 0x30, 0x07, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x04,
0x14
};
static unsigned char sha224_nn_bin[] = {
0x30, 0x2b, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x04, 0x04, 0x1c
};
static unsigned char sha256_nn_bin[] = {
0x30, 0x2f, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x01, 0x04, 0x20
};
static unsigned char sha384_nn_bin[] = {
0x30, 0x3f, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x02, 0x04, 0x30
};
static unsigned char sha512_nn_bin[] = {
0x30, 0x4f, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
0x04, 0x02, 0x03, 0x04, 0x40
};
static const unsigned char *fips_digestinfo_encoding(int nid,
unsigned int *len)
{
switch (nid) {
case NID_sha1:
*len = sizeof(sha1_bin);
return sha1_bin;
case NID_sha224:
*len = sizeof(sha224_bin);
return sha224_bin;
case NID_sha256:
*len = sizeof(sha256_bin);
return sha256_bin;
case NID_sha384:
*len = sizeof(sha384_bin);
return sha384_bin;
case NID_sha512:
*len = sizeof(sha512_bin);
return sha512_bin;
default:
return NULL;
}
}
static const unsigned char *fips_digestinfo_nn_encoding(int nid,
unsigned int *len)
{
switch (nid) {
case NID_sha1:
*len = sizeof(sha1_nn_bin);
return sha1_nn_bin;
case NID_sha224:
*len = sizeof(sha224_nn_bin);
return sha224_nn_bin;
case NID_sha256:
*len = sizeof(sha256_nn_bin);
return sha256_nn_bin;
case NID_sha384:
*len = sizeof(sha384_nn_bin);
return sha384_nn_bin;
case NID_sha512:
*len = sizeof(sha512_nn_bin);
return sha512_nn_bin;
default:
return NULL;
}
}
static int fips_rsa_sign(int type, const unsigned char *x, unsigned int y,
unsigned char *sigret, unsigned int *siglen,
EVP_MD_SVCTX * sv)
{
int i = 0, j, ret = 0;
unsigned int dlen;
const unsigned char *der;
unsigned int m_len;
int pad_mode = sv->mctx->flags & EVP_MD_CTX_FLAG_PAD_MASK;
int rsa_pad_mode = 0;
RSA *rsa = sv->key;
/* Largest DigestInfo: 19 (max encoding) + max MD */
unsigned char tmpdinfo[19 + EVP_MAX_MD_SIZE];
unsigned char md[EVP_MAX_MD_SIZE + 1];
EVP_DigestFinal_ex(sv->mctx, md, &m_len);
if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign) {
ret = rsa->meth->rsa_sign(type, md, m_len, sigret, siglen, rsa);
goto done;
}
if (pad_mode == EVP_MD_CTX_FLAG_PAD_X931) {
int hash_id;
memcpy(tmpdinfo, md, m_len);
hash_id = RSA_X931_hash_id(M_EVP_MD_CTX_type(sv->mctx));
if (hash_id == -1) {
RSAerr(RSA_F_FIPS_RSA_SIGN, RSA_R_UNKNOWN_ALGORITHM_TYPE);
return 0;
}
tmpdinfo[m_len] = (unsigned char)hash_id;
i = m_len + 1;
rsa_pad_mode = RSA_X931_PADDING;
} else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PKCS1) {
der = fips_digestinfo_encoding(type, &dlen);
if (!der) {
RSAerr(RSA_F_FIPS_RSA_SIGN, RSA_R_UNKNOWN_ALGORITHM_TYPE);
return 0;
}
memcpy(tmpdinfo, der, dlen);
memcpy(tmpdinfo + dlen, md, m_len);
i = dlen + m_len;
rsa_pad_mode = RSA_PKCS1_PADDING;
} else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PSS) {
unsigned char *sbuf;
int saltlen;
i = RSA_size(rsa);
sbuf = OPENSSL_malloc(RSA_size(rsa));
saltlen = M_EVP_MD_CTX_FLAG_PSS_SALT(sv->mctx);
if (saltlen == EVP_MD_CTX_FLAG_PSS_MDLEN)
saltlen = -1;
else if (saltlen == EVP_MD_CTX_FLAG_PSS_MREC)
saltlen = -2;
if (!sbuf) {
RSAerr(RSA_F_FIPS_RSA_SIGN, ERR_R_MALLOC_FAILURE);
goto psserr;
}
if (!RSA_padding_add_PKCS1_PSS(rsa, sbuf, md,
M_EVP_MD_CTX_md(sv->mctx), saltlen))
goto psserr;
j = rsa->meth->rsa_priv_enc(i, sbuf, sigret, rsa, RSA_NO_PADDING);
if (j > 0) {
ret = 1;
*siglen = j;
}
psserr:
OPENSSL_cleanse(md, m_len);
OPENSSL_cleanse(sbuf, i);
OPENSSL_free(sbuf);
return ret;
}
j = RSA_size(rsa);
if (i > (j - RSA_PKCS1_PADDING_SIZE)) {
RSAerr(RSA_F_FIPS_RSA_SIGN, RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
goto done;
}
/* NB: call underlying method directly to avoid FIPS blocking */
j = rsa->meth->rsa_priv_enc(i, tmpdinfo, sigret, rsa, rsa_pad_mode);
if (j > 0) {
ret = 1;
*siglen = j;
}
done:
OPENSSL_cleanse(tmpdinfo, i);
OPENSSL_cleanse(md, m_len);
return ret;
}
static int fips_rsa_verify(int dtype,
const unsigned char *x, unsigned int y,
unsigned char *sigbuf, unsigned int siglen,
EVP_MD_SVCTX * sv)
{
int i, ret = 0;
unsigned int dlen, diglen;
int pad_mode = sv->mctx->flags & EVP_MD_CTX_FLAG_PAD_MASK;
int rsa_pad_mode = 0;
unsigned char *s;
const unsigned char *der;
unsigned char dig[EVP_MAX_MD_SIZE];
RSA *rsa = sv->key;
if (siglen != (unsigned int)RSA_size(sv->key)) {
RSAerr(RSA_F_FIPS_RSA_VERIFY, RSA_R_WRONG_SIGNATURE_LENGTH);
return (0);
}
EVP_DigestFinal_ex(sv->mctx, dig, &diglen);
if ((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify) {
return rsa->meth->rsa_verify(dtype, dig, diglen, sigbuf, siglen, rsa);
}
s = OPENSSL_malloc((unsigned int)siglen);
if (s == NULL) {
RSAerr(RSA_F_FIPS_RSA_VERIFY, ERR_R_MALLOC_FAILURE);
goto err;
}
if (pad_mode == EVP_MD_CTX_FLAG_PAD_X931)
rsa_pad_mode = RSA_X931_PADDING;
else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PKCS1)
rsa_pad_mode = RSA_PKCS1_PADDING;
else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PSS)
rsa_pad_mode = RSA_NO_PADDING;
/* NB: call underlying method directly to avoid FIPS blocking */
i = rsa->meth->rsa_pub_dec((int)siglen, sigbuf, s, rsa, rsa_pad_mode);
if (i <= 0)
goto err;
if (pad_mode == EVP_MD_CTX_FLAG_PAD_X931) {
int hash_id;
if (i != (int)(diglen + 1)) {
RSAerr(RSA_F_FIPS_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
goto err;
}
hash_id = RSA_X931_hash_id(M_EVP_MD_CTX_type(sv->mctx));
if (hash_id == -1) {
RSAerr(RSA_F_FIPS_RSA_VERIFY, RSA_R_UNKNOWN_ALGORITHM_TYPE);
goto err;
}
if (s[diglen] != (unsigned char)hash_id) {
RSAerr(RSA_F_FIPS_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
goto err;
}
if (memcmp(s, dig, diglen)) {
RSAerr(RSA_F_FIPS_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
goto err;
}
ret = 1;
} else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PKCS1) {
der = fips_digestinfo_encoding(dtype, &dlen);
if (!der) {
RSAerr(RSA_F_FIPS_RSA_VERIFY, RSA_R_UNKNOWN_ALGORITHM_TYPE);
return (0);
}
/*
* Compare, DigestInfo length, DigestInfo header and finally digest
* value itself
*/
/* If length mismatch try alternate encoding */
if (i != (int)(dlen + diglen))
der = fips_digestinfo_nn_encoding(dtype, &dlen);
if ((i != (int)(dlen + diglen)) || memcmp(der, s, dlen)
|| memcmp(s + dlen, dig, diglen)) {
RSAerr(RSA_F_FIPS_RSA_VERIFY, RSA_R_BAD_SIGNATURE);
goto err;
}
ret = 1;
} else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PSS) {
int saltlen;
saltlen = M_EVP_MD_CTX_FLAG_PSS_SALT(sv->mctx);
if (saltlen == EVP_MD_CTX_FLAG_PSS_MDLEN)
saltlen = -1;
else if (saltlen == EVP_MD_CTX_FLAG_PSS_MREC)
saltlen = -2;
ret = RSA_verify_PKCS1_PSS(rsa, dig, M_EVP_MD_CTX_md(sv->mctx),
s, saltlen);
if (ret < 0)
ret = 0;
}
err:
if (s != NULL) {
OPENSSL_cleanse(s, siglen);
OPENSSL_free(s);
}
return (ret);
}
# define EVP_PKEY_RSA_fips_method \
(evp_sign_method *)fips_rsa_sign, \
(evp_verify_method *)fips_rsa_verify, \
{EVP_PKEY_RSA,EVP_PKEY_RSA2,0,0}
static int init(EVP_MD_CTX *ctx)
{
return SHA1_Init(ctx->md_data);
}
static int update(EVP_MD_CTX *ctx, const void *data, size_t count)
{
return SHA1_Update(ctx->md_data, data, count);
}
static int final(EVP_MD_CTX *ctx, unsigned char *md)
{
return SHA1_Final(md, ctx->md_data);
}
static const EVP_MD sha1_md = {
NID_sha1,
NID_sha1WithRSAEncryption,
SHA_DIGEST_LENGTH,
EVP_MD_FLAG_FIPS | EVP_MD_FLAG_SVCTX,
init,
update,
final,
NULL,
NULL,
EVP_PKEY_RSA_fips_method,
SHA_CBLOCK,
sizeof(EVP_MD *) + sizeof(SHA_CTX),
};
const EVP_MD *EVP_sha1(void)
{
return (&sha1_md);
}
static int init224(EVP_MD_CTX *ctx)
{
return SHA224_Init(ctx->md_data);
}
static int init256(EVP_MD_CTX *ctx)
{
return SHA256_Init(ctx->md_data);
}
/*
* Even though there're separate SHA224_[Update|Final], we call
* SHA256 functions even in SHA224 context. This is what happens
* there anyway, so we can spare few CPU cycles:-)
*/
static int update256(EVP_MD_CTX *ctx, const void *data, size_t count)
{
return SHA256_Update(ctx->md_data, data, count);
}
static int final256(EVP_MD_CTX *ctx, unsigned char *md)
{
return SHA256_Final(md, ctx->md_data);
}
static const EVP_MD sha224_md = {
NID_sha224,
NID_sha224WithRSAEncryption,
SHA224_DIGEST_LENGTH,
EVP_MD_FLAG_FIPS | EVP_MD_FLAG_SVCTX,
init224,
update256,
final256,
NULL,
NULL,
EVP_PKEY_RSA_fips_method,
SHA256_CBLOCK,
sizeof(EVP_MD *) + sizeof(SHA256_CTX),
};
const EVP_MD *EVP_sha224(void)
{
return (&sha224_md);
}
static const EVP_MD sha256_md = {
NID_sha256,
NID_sha256WithRSAEncryption,
SHA256_DIGEST_LENGTH,
EVP_MD_FLAG_FIPS | EVP_MD_FLAG_SVCTX,
init256,
update256,
final256,
NULL,
NULL,
EVP_PKEY_RSA_fips_method,
SHA256_CBLOCK,
sizeof(EVP_MD *) + sizeof(SHA256_CTX),
};
const EVP_MD *EVP_sha256(void)
{
return (&sha256_md);
}
static int init384(EVP_MD_CTX *ctx)
{
return SHA384_Init(ctx->md_data);
}
static int init512(EVP_MD_CTX *ctx)
{
return SHA512_Init(ctx->md_data);
}
/* See comment in SHA224/256 section */
static int update512(EVP_MD_CTX *ctx, const void *data, size_t count)
{
return SHA512_Update(ctx->md_data, data, count);
}
static int final512(EVP_MD_CTX *ctx, unsigned char *md)
{
return SHA512_Final(md, ctx->md_data);
}
static const EVP_MD sha384_md = {
NID_sha384,
NID_sha384WithRSAEncryption,
SHA384_DIGEST_LENGTH,
EVP_MD_FLAG_FIPS | EVP_MD_FLAG_SVCTX,
init384,
update512,
final512,
NULL,
NULL,
EVP_PKEY_RSA_fips_method,
SHA512_CBLOCK,
sizeof(EVP_MD *) + sizeof(SHA512_CTX),
};
const EVP_MD *EVP_sha384(void)
{
return (&sha384_md);
}
static const EVP_MD sha512_md = {
NID_sha512,
NID_sha512WithRSAEncryption,
SHA512_DIGEST_LENGTH,
EVP_MD_FLAG_FIPS | EVP_MD_FLAG_SVCTX,
init512,
update512,
final512,
NULL,
NULL,
EVP_PKEY_RSA_fips_method,
SHA512_CBLOCK,
sizeof(EVP_MD *) + sizeof(SHA512_CTX),
};
const EVP_MD *EVP_sha512(void)
{
return (&sha512_md);
}
#endif
