/* crypto/rsa/rsa_pmeth.c */
/* 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 <stdio.h>
#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/rsa.h>
#include <openssl/bn.h>
#include <openssl/evp.h>
#ifndef OPENSSL_NO_CMS
#include <openssl/cms.h>
#endif
#ifdef OPENSSL_FIPS
#include <openssl/fips.h>
#endif
#include "evp_locl.h"
#include "rsa_locl.h"
/* RSA pkey context structure */
typedef struct
{
/* Key gen parameters */
int nbits;
BIGNUM *pub_exp;
/* Keygen callback info */
int gentmp[2];
/* RSA padding mode */
int pad_mode;
/* message digest */
const EVP_MD *md;
/* message digest for MGF1 */
const EVP_MD *mgf1md;
/* PSS/OAEP salt length */
int saltlen;
/* Temp buffer */
unsigned char *tbuf;
} 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;
rctx->nbits = 1024;
rctx->pub_exp = NULL;
rctx->pad_mode = RSA_PKCS1_PADDING;
rctx->md = NULL;
rctx->mgf1md = NULL;
rctx->tbuf = NULL;
rctx->saltlen = -2;
ctx->data = rctx;
ctx->keygen_info = rctx->gentmp;
ctx->keygen_info_count = 2;
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;
return 1;
}
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 void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
{
RSA_PKEY_CTX *rctx = ctx->data;
if (rctx)
{
if (rctx->pub_exp)
BN_free(rctx->pub_exp);
if (rctx->tbuf)
OPENSSL_free(rctx->tbuf);
OPENSSL_free(rctx);
}
}
#ifdef OPENSSL_FIPS
/* FIP checker. Return value indicates status of context parameters:
* 1 : redirect to FIPS.
* 0 : don't redirect to FIPS.
* -1 : illegal operation in FIPS mode.
*/
static int pkey_fips_check_ctx(EVP_PKEY_CTX *ctx)
{
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
int rv = -1;
if (!FIPS_mode())
return 0;
if (rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)
rv = 0;
if (!(rsa->meth->flags & RSA_FLAG_FIPS_METHOD) && rv)
return -1;
if (rctx->md && !(rctx->md->flags & EVP_MD_FLAG_FIPS))
return rv;
if (rctx->mgf1md && !(rctx->mgf1md->flags & EVP_MD_FLAG_FIPS))
return rv;
return 1;
}
#endif
static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
const unsigned char *tbs, size_t tbslen)
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
#ifdef OPENSSL_FIPS
ret = pkey_fips_check_ctx(ctx);
if (ret < 0)
{
RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
return -1;
}
#endif
if (rctx->md)
{
if (tbslen != (size_t)EVP_MD_size(rctx->md))
{
RSAerr(RSA_F_PKEY_RSA_SIGN,
RSA_R_INVALID_DIGEST_LENGTH);
return -1;
}
#ifdef OPENSSL_FIPS
if (ret > 0)
{
unsigned int slen;
ret = FIPS_rsa_sign_digest(rsa, tbs, tbslen, rctx->md,
rctx->pad_mode,
rctx->saltlen,
rctx->mgf1md,
sig, &slen);
if (ret > 0)
*siglen = slen;
else
*siglen = 0;
return ret;
}
#endif
if (EVP_MD_type(rctx->md) == NID_mdc2)
{
unsigned int sltmp;
if (rctx->pad_mode != RSA_PKCS1_PADDING)
return -1;
ret = RSA_sign_ASN1_OCTET_STRING(NID_mdc2,
tbs, tbslen, sig, &sltmp, rsa);
if (ret <= 0)
return ret;
ret = sltmp;
}
else if (rctx->pad_mode == RSA_X931_PADDING)
{
if (!setup_tbuf(rctx, ctx))
return -1;
memcpy(rctx->tbuf, tbs, tbslen);
rctx->tbuf[tbslen] =
RSA_X931_hash_id(EVP_MD_type(rctx->md));
ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
sig, rsa, RSA_X931_PADDING);
}
else if (rctx->pad_mode == RSA_PKCS1_PADDING)
{
unsigned int sltmp;
ret = RSA_sign(EVP_MD_type(rctx->md),
tbs, tbslen, sig, &sltmp, rsa);
if (ret <= 0)
return ret;
ret = sltmp;
}
else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
{
if (!setup_tbuf(rctx, ctx))
return -1;
if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
rctx->tbuf, tbs,
rctx->md, rctx->mgf1md,
rctx->saltlen))
return -1;
ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
sig, rsa, RSA_NO_PADDING);
}
else
return -1;
}
else
ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
rctx->pad_mode);
if (ret < 0)
return ret;
*siglen = ret;
return 1;
}
static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
unsigned char *rout, size_t *routlen,
const unsigned char *sig, size_t siglen)
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
if (rctx->md)
{
if (rctx->pad_mode == RSA_X931_PADDING)
{
if (!setup_tbuf(rctx, ctx))
return -1;
ret = RSA_public_decrypt(siglen, sig,
rctx->tbuf, ctx->pkey->pkey.rsa,
RSA_X931_PADDING);
if (ret < 1)
return 0;
ret--;
if (rctx->tbuf[ret] !=
RSA_X931_hash_id(EVP_MD_type(rctx->md)))
{
RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
RSA_R_ALGORITHM_MISMATCH);
return 0;
}
if (ret != EVP_MD_size(rctx->md))
{
RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
RSA_R_INVALID_DIGEST_LENGTH);
return 0;
}
if (rout)
memcpy(rout, rctx->tbuf, ret);
}
else if (rctx->pad_mode == RSA_PKCS1_PADDING)
{
size_t sltmp;
ret = int_rsa_verify(EVP_MD_type(rctx->md),
NULL, 0, rout, &sltmp,
sig, siglen, ctx->pkey->pkey.rsa);
if (ret <= 0)
return 0;
ret = sltmp;
}
else
return -1;
}
else
ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
rctx->pad_mode);
if (ret < 0)
return ret;
*routlen = ret;
return 1;
}
static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
RSA_PKEY_CTX *rctx = ctx->data;
RSA *rsa = ctx->pkey->pkey.rsa;
size_t rslen;
#ifdef OPENSSL_FIPS
int rv;
rv = pkey_fips_check_ctx(ctx);
if (rv < 0)
{
RSAerr(RSA_F_PKEY_RSA_VERIFY, RSA_R_OPERATION_NOT_ALLOWED_IN_FIPS_MODE);
return -1;
}
#endif
if (rctx->md)
{
#ifdef OPENSSL_FIPS
if (rv > 0)
{
return FIPS_rsa_verify_digest(rsa,
tbs, tbslen,
rctx->md,
rctx->pad_mode,
rctx->saltlen,
rctx->mgf1md,
sig, siglen);
}
#endif
if (rctx->pad_mode == RSA_PKCS1_PADDING)
return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
sig, siglen, rsa);
if (rctx->pad_mode == RSA_X931_PADDING)
{
if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
sig, siglen) <= 0)
return 0;
}
else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
{
int ret;
if (!setup_tbuf(rctx, ctx))
return -1;
ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
rsa, RSA_NO_PADDING);
if (ret <= 0)
return 0;
ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
rctx->md, rctx->mgf1md,
rctx->tbuf, rctx->saltlen);
if (ret <= 0)
return 0;
return 1;
}
else
return -1;
}
else
{
if (!setup_tbuf(rctx, ctx))
return -1;
rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
rsa, rctx->pad_mode);
if (rslen == 0)
return 0;
}
if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
return 0;
return 1;
}
static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
unsigned char *out, size_t *outlen,
const unsigned char *in, size_t inlen)
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
rctx->pad_mode);
if (ret < 0)
return ret;
*outlen = ret;
return 1;
}
static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
unsigned char *out, size_t *outlen,
const unsigned char *in, size_t inlen)
{
int ret;
RSA_PKEY_CTX *rctx = ctx->data;
ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
rctx->pad_mode);
if (ret < 0)
return ret;
*outlen = ret;
return 1;
}
static int check_padding_md(const EVP_MD *md, int padding)
{
if (!md)
return 1;
if (padding == RSA_NO_PADDING)
{
RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
return 0;
}
if (padding == RSA_X931_PADDING)
{
if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
{
RSAerr(RSA_F_CHECK_PADDING_MD,
RSA_R_INVALID_X931_DIGEST);
return 0;
}
return 1;
}
return 1;
}
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 ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
{
if (!check_padding_md(rctx->md, p1))
return 0;
if (p1 == RSA_PKCS1_PSS_PADDING)
{
if (!(ctx->operation &
(EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
goto bad_pad;
if (!rctx->md)
rctx->md = EVP_sha1();
}
if (p1 == RSA_PKCS1_OAEP_PADDING)
{
if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
goto bad_pad;
if (!rctx->md)
rctx->md = EVP_sha1();
}
rctx->pad_mode = p1;
return 1;
}
bad_pad:
RSAerr(RSA_F_PKEY_RSA_CTRL,
RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return -2;
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)
{
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_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)
{
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
return -2;
}
rctx->nbits = p1;
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
if (!p2)
return -2;
rctx->pub_exp = 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_RSA_MGF1_MD:
case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
{
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_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_DIGESTINIT:
case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
case EVP_PKEY_CTRL_PKCS7_DECRYPT:
case EVP_PKEY_CTRL_PKCS7_SIGN:
return 1;
#ifndef OPENSSL_NO_CMS
case EVP_PKEY_CTRL_CMS_DECRYPT:
{
X509_ALGOR *alg = NULL;
ASN1_OBJECT *encalg = NULL;
if (p2)
CMS_RecipientInfo_ktri_get0_algs(p2, NULL, NULL, &alg);
if (alg)
X509_ALGOR_get0(&encalg, NULL, NULL, alg);
if (encalg && OBJ_obj2nid(encalg) == NID_rsaesOaep)
rctx->pad_mode = RSA_PKCS1_OAEP_PADDING;
}
case EVP_PKEY_CTRL_CMS_ENCRYPT:
case EVP_PKEY_CTRL_CMS_SIGN:
return 1;
#endif
case EVP_PKEY_CTRL_PEER_KEY:
RSAerr(RSA_F_PKEY_RSA_CTRL,
RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
default:
return -2;
}
}
static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (!value)
{
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
return 0;
}
if (!strcmp(type, "rsa_padding_mode"))
{
int pm;
if (!strcmp(value, "pkcs1"))
pm = RSA_PKCS1_PADDING;
else if (!strcmp(value, "sslv23"))
pm = RSA_SSLV23_PADDING;
else if (!strcmp(value, "none"))
pm = RSA_NO_PADDING;
else if (!strcmp(value, "oeap"))
pm = RSA_PKCS1_OAEP_PADDING;
else if (!strcmp(value, "x931"))
pm = RSA_X931_PADDING;
else if (!strcmp(value, "pss"))
pm = RSA_PKCS1_PSS_PADDING;
else
{
RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
RSA_R_UNKNOWN_PADDING_TYPE);
return -2;
}
return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
}
if (!strcmp(type, "rsa_pss_saltlen"))
{
int saltlen;
saltlen = atoi(value);
return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
}
if (!strcmp(type, "rsa_keygen_bits"))
{
int nbits;
nbits = atoi(value);
return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
}
if (!strcmp(type, "rsa_keygen_pubexp"))
{
int ret;
BIGNUM *pubexp = NULL;
if (!BN_asc2bn(&pubexp, value))
return 0;
ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
if (ret <= 0)
BN_free(pubexp);
return ret;
}
return -2;
}
static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
RSA *rsa = NULL;
RSA_PKEY_CTX *rctx = ctx->data;
BN_GENCB *pcb, cb;
int ret;
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 (ctx->pkey_gencb)
{
pcb = &cb;
evp_pkey_set_cb_translate(pcb, ctx);
}
else
pcb = NULL;
ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
if (ret > 0)
EVP_PKEY_assign_RSA(pkey, rsa);
else
RSA_free(rsa);
return ret;
}
const EVP_PKEY_METHOD rsa_pkey_meth =
{
EVP_PKEY_RSA,
EVP_PKEY_FLAG_AUTOARGLEN,
pkey_rsa_init,
pkey_rsa_copy,
pkey_rsa_cleanup,
0,0,
0,
pkey_rsa_keygen,
0,
pkey_rsa_sign,
0,
pkey_rsa_verify,
0,
pkey_rsa_verifyrecover,
0,0,0,0,
0,
pkey_rsa_encrypt,
0,
pkey_rsa_decrypt,
0,0,
pkey_rsa_ctrl,
pkey_rsa_ctrl_str
};