* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
+/* ====================================================================
+ * Copyright (c) 1998-2006 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
+ * openssl-core@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).
+ *
+ */
+
+#define OPENSSL_FIPSAPI
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/rand.h>
+#ifdef OPENSSL_FIPS
+#include <openssl/fips.h>
+#endif
#ifndef RSA_NULL
BN_mod_exp_mont, /* XXX probably we should not use Montgomery if e == 3 */
RSA_eay_init,
RSA_eay_finish,
- 0, /* flags */
+ RSA_FLAG_FIPS_METHOD, /* flags */
NULL,
0, /* rsa_sign */
0, /* rsa_verify */
return(&rsa_pkcs1_eay_meth);
}
-/* Static helper to reduce oodles of code duplication. As a slight
- * optimisation, the "MONT_HELPER() macro must be used as front-end to this
- * function, to prevent unnecessary function calls - there is an initial test
- * that is performed by the macro-generated code. */
-static int rsa_eay_mont_helper(BN_MONT_CTX **ptr, const BIGNUM *modulus, BN_CTX *ctx)
- {
- BN_MONT_CTX *bn_mont_ctx;
- if((bn_mont_ctx = BN_MONT_CTX_new()) == NULL)
- return 0;
- if(!BN_MONT_CTX_set(bn_mont_ctx, modulus, ctx))
- {
- BN_MONT_CTX_free(bn_mont_ctx);
- return 0;
- }
- if (*ptr == NULL) /* other thread may have finished first */
- {
- CRYPTO_w_lock(CRYPTO_LOCK_RSA);
- if (*ptr == NULL) /* check again in the lock to stop races */
- {
- *ptr = bn_mont_ctx;
- bn_mont_ctx = NULL;
- }
- CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
- }
- if (bn_mont_ctx)
- BN_MONT_CTX_free(bn_mont_ctx);
- return 1;
- }
-/* Usage example;
- * MONT_HELPER(rsa, bn_ctx, p, rsa->flags & RSA_FLAG_CACHE_PRIVATE, goto err);
- */
-#define MONT_HELPER(rsa, ctx, m, pre_cond, err_instr) \
- if((pre_cond) && ((rsa)->_method_mod_##m == NULL) && \
- !rsa_eay_mont_helper(&((rsa)->_method_mod_##m), \
- (rsa)->m, (ctx))) \
- err_instr
-
static int RSA_eay_public_encrypt(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding)
{
unsigned char *buf=NULL;
BN_CTX *ctx=NULL;
+#ifdef OPENSSL_FIPS
+ if(FIPS_selftest_failed())
+ {
+ FIPSerr(FIPS_F_RSA_EAY_PUBLIC_ENCRYPT,FIPS_R_FIPS_SELFTEST_FAILED);
+ goto err;
+ }
+
+ if (FIPS_module_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)
+ && (BN_num_bits(rsa->n) < OPENSSL_RSA_FIPS_MIN_MODULUS_BITS))
+ {
+ RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_KEY_SIZE_TOO_SMALL);
+ return -1;
+ }
+#endif
+
+ if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS)
+ {
+ RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_MODULUS_TOO_LARGE);
+ return -1;
+ }
+
+ if (BN_ucmp(rsa->n, rsa->e) <= 0)
+ {
+ RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE);
+ return -1;
+ }
+
+ /* for large moduli, enforce exponent limit */
+ if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS)
+ {
+ if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS)
+ {
+ RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT, RSA_R_BAD_E_VALUE);
+ return -1;
+ }
+ }
+
if ((ctx=BN_CTX_new()) == NULL) goto err;
BN_CTX_start(ctx);
f = BN_CTX_get(ctx);
if (BN_bin2bn(buf,num,f) == NULL) goto err;
if (BN_ucmp(f, rsa->n) >= 0)
- {
+ {
/* usually the padding functions would catch this */
RSAerr(RSA_F_RSA_EAY_PUBLIC_ENCRYPT,RSA_R_DATA_TOO_LARGE_FOR_MODULUS);
goto err;
}
- MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err);
+ if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+ if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+ goto err;
if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx,
rsa->_method_mod_n)) goto err;
return(r);
}
-static int rsa_eay_blinding(RSA *rsa, BN_CTX *ctx)
- {
- int ret = 1;
- CRYPTO_w_lock(CRYPTO_LOCK_RSA);
- /* Check again inside the lock - the macro's check is racey */
- if(rsa->blinding == NULL)
- ret = RSA_blinding_on(rsa, ctx);
- CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
- return ret;
- }
+static BN_BLINDING *rsa_get_blinding(RSA *rsa, int *local, BN_CTX *ctx)
+{
+ BN_BLINDING *ret;
+ int got_write_lock = 0;
+ CRYPTO_THREADID cur;
-#define BLINDING_HELPER(rsa, ctx, err_instr) \
- do { \
- if((!((rsa)->flags & RSA_FLAG_NO_BLINDING)) && \
- ((rsa)->blinding == NULL) && \
- !rsa_eay_blinding(rsa, ctx)) \
- err_instr \
- } while(0)
+ CRYPTO_r_lock(CRYPTO_LOCK_RSA);
-static BN_BLINDING *setup_blinding(RSA *rsa, BN_CTX *ctx)
- {
- BIGNUM *A, *Ai;
- BN_BLINDING *ret = NULL;
+ if (rsa->blinding == NULL)
+ {
+ CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
+ CRYPTO_w_lock(CRYPTO_LOCK_RSA);
+ got_write_lock = 1;
- /* added in OpenSSL 0.9.6j and 0.9.7b */
+ if (rsa->blinding == NULL)
+ rsa->blinding = RSA_setup_blinding(rsa, ctx);
+ }
- /* NB: similar code appears in RSA_blinding_on (rsa_lib.c);
- * this should be placed in a new function of its own, but for reasons
- * of binary compatibility can't */
+ ret = rsa->blinding;
+ if (ret == NULL)
+ goto err;
- BN_CTX_start(ctx);
- A = BN_CTX_get(ctx);
- if ((RAND_status() == 0) && rsa->d != NULL && rsa->d->d != NULL)
+ CRYPTO_THREADID_current(&cur);
+ if (!CRYPTO_THREADID_cmp(&cur, BN_BLINDING_thread_id(ret)))
{
- /* if PRNG is not properly seeded, resort to secret exponent as unpredictable seed */
- RAND_add(rsa->d->d, rsa->d->dmax * sizeof rsa->d->d[0], 0.0);
- if (!BN_pseudo_rand_range(A,rsa->n)) goto err;
+ /* rsa->blinding is ours! */
+
+ *local = 1;
}
else
{
- if (!BN_rand_range(A,rsa->n)) goto err;
+ /* resort to rsa->mt_blinding instead */
+
+ *local = 0; /* instructs rsa_blinding_convert(), rsa_blinding_invert()
+ * that the BN_BLINDING is shared, meaning that accesses
+ * require locks, and that the blinding factor must be
+ * stored outside the BN_BLINDING
+ */
+
+ if (rsa->mt_blinding == NULL)
+ {
+ if (!got_write_lock)
+ {
+ CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
+ CRYPTO_w_lock(CRYPTO_LOCK_RSA);
+ got_write_lock = 1;
+ }
+
+ if (rsa->mt_blinding == NULL)
+ rsa->mt_blinding = RSA_setup_blinding(rsa, ctx);
+ }
+ ret = rsa->mt_blinding;
}
- if ((Ai=BN_mod_inverse(NULL,A,rsa->n,ctx)) == NULL) goto err;
- if (!rsa->meth->bn_mod_exp(A,A,rsa->e,rsa->n,ctx,rsa->_method_mod_n))
- goto err;
- ret = BN_BLINDING_new(A,Ai,rsa->n);
- BN_free(Ai);
-err:
- BN_CTX_end(ctx);
+ err:
+ if (got_write_lock)
+ CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
+ else
+ CRYPTO_r_unlock(CRYPTO_LOCK_RSA);
return ret;
- }
+}
+
+static int rsa_blinding_convert(BN_BLINDING *b, int local, BIGNUM *f,
+ BIGNUM *r, BN_CTX *ctx)
+{
+ if (local)
+ return BN_BLINDING_convert_ex(f, NULL, b, ctx);
+ else
+ {
+ int ret;
+ CRYPTO_r_lock(CRYPTO_LOCK_RSA_BLINDING);
+ ret = BN_BLINDING_convert_ex(f, r, b, ctx);
+ CRYPTO_r_unlock(CRYPTO_LOCK_RSA_BLINDING);
+ return ret;
+ }
+}
+
+static int rsa_blinding_invert(BN_BLINDING *b, int local, BIGNUM *f,
+ BIGNUM *r, BN_CTX *ctx)
+{
+ if (local)
+ return BN_BLINDING_invert_ex(f, NULL, b, ctx);
+ else
+ {
+ int ret;
+ CRYPTO_w_lock(CRYPTO_LOCK_RSA_BLINDING);
+ ret = BN_BLINDING_invert_ex(f, r, b, ctx);
+ CRYPTO_w_unlock(CRYPTO_LOCK_RSA_BLINDING);
+ return ret;
+ }
+}
/* signing */
static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding)
{
- BIGNUM *f,*ret;
+ BIGNUM *f, *ret, *br, *res;
int i,j,k,num=0,r= -1;
unsigned char *buf=NULL;
BN_CTX *ctx=NULL;
int local_blinding = 0;
BN_BLINDING *blinding = NULL;
+#ifdef OPENSSL_FIPS
+ if(FIPS_selftest_failed())
+ {
+ FIPSerr(FIPS_F_RSA_EAY_PRIVATE_ENCRYPT,FIPS_R_FIPS_SELFTEST_FAILED);
+ goto err;
+ }
+
+ if (FIPS_module_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)
+ && (BN_num_bits(rsa->n) < OPENSSL_RSA_FIPS_MIN_MODULUS_BITS))
+ {
+ RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, RSA_R_KEY_SIZE_TOO_SMALL);
+ return -1;
+ }
+#endif
+
if ((ctx=BN_CTX_new()) == NULL) goto err;
BN_CTX_start(ctx);
- f = BN_CTX_get(ctx);
+ f = BN_CTX_get(ctx);
+ br = BN_CTX_get(ctx);
ret = BN_CTX_get(ctx);
- num=BN_num_bytes(rsa->n);
+ num = BN_num_bytes(rsa->n);
buf = OPENSSL_malloc(num);
if(!f || !ret || !buf)
{
case RSA_PKCS1_PADDING:
i=RSA_padding_add_PKCS1_type_1(buf,num,from,flen);
break;
+ case RSA_X931_PADDING:
+ i=RSA_padding_add_X931(buf,num,from,flen);
+ break;
case RSA_NO_PADDING:
i=RSA_padding_add_none(buf,num,from,flen);
break;
goto err;
}
- BLINDING_HELPER(rsa, ctx, goto err;);
- blinding = rsa->blinding;
-
- /* Now unless blinding is disabled, 'blinding' is non-NULL.
- * But the BN_BLINDING object may be owned by some other thread
- * (we don't want to keep it constant and we don't want to use
- * lots of locking to avoid race conditions, so only a single
- * thread can use it; other threads have to use local blinding
- * factors) */
if (!(rsa->flags & RSA_FLAG_NO_BLINDING))
{
+ blinding = rsa_get_blinding(rsa, &local_blinding, ctx);
if (blinding == NULL)
{
RSAerr(RSA_F_RSA_EAY_PRIVATE_ENCRYPT, ERR_R_INTERNAL_ERROR);
}
if (blinding != NULL)
- {
- if (blinding->thread_id != CRYPTO_thread_id())
- {
- /* we need a local one-time blinding factor */
-
- blinding = setup_blinding(rsa, ctx);
- if (blinding == NULL)
- goto err;
- local_blinding = 1;
- }
- }
-
- if (blinding)
- if (!BN_BLINDING_convert(f, blinding, ctx)) goto err;
+ if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx))
+ goto err;
if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
((rsa->p != NULL) &&
(rsa->dmp1 != NULL) &&
(rsa->dmq1 != NULL) &&
(rsa->iqmp != NULL)) )
- { if (!rsa->meth->rsa_mod_exp(ret,f,rsa,ctx)) goto err; }
+ {
+ if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err;
+ }
else
{
- MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err);
- if (!rsa->meth->bn_mod_exp(ret,f,rsa->d,rsa->n,ctx,
+ BIGNUM local_d;
+ BIGNUM *d = NULL;
+
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ BN_init(&local_d);
+ d = &local_d;
+ BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+ }
+ else
+ d= rsa->d;
+
+ if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+ if(!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+ goto err;
+
+ if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx,
rsa->_method_mod_n)) goto err;
}
if (blinding)
- if (!BN_BLINDING_invert(ret, blinding, ctx)) goto err;
+ if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx))
+ goto err;
+
+ if (padding == RSA_X931_PADDING)
+ {
+ BN_sub(f, rsa->n, ret);
+ if (BN_cmp(ret, f))
+ res = f;
+ else
+ res = ret;
+ }
+ else
+ res = ret;
/* put in leading 0 bytes if the number is less than the
* length of the modulus */
- j=BN_num_bytes(ret);
- i=BN_bn2bin(ret,&(to[num-j]));
+ j=BN_num_bytes(res);
+ i=BN_bn2bin(res,&(to[num-j]));
for (k=0; k<(num-i); k++)
to[k]=0;
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
- if (local_blinding)
- BN_BLINDING_free(blinding);
if (buf != NULL)
{
OPENSSL_cleanse(buf,num);
static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
unsigned char *to, RSA *rsa, int padding)
{
- BIGNUM *f,*ret;
+ BIGNUM *f, *ret, *br;
int j,num=0,r= -1;
unsigned char *p;
unsigned char *buf=NULL;
int local_blinding = 0;
BN_BLINDING *blinding = NULL;
+#ifdef OPENSSL_FIPS
+ if(FIPS_selftest_failed())
+ {
+ FIPSerr(FIPS_F_RSA_EAY_PRIVATE_DECRYPT,FIPS_R_FIPS_SELFTEST_FAILED);
+ goto err;
+ }
+
+ if (FIPS_module_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)
+ && (BN_num_bits(rsa->n) < OPENSSL_RSA_FIPS_MIN_MODULUS_BITS))
+ {
+ RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, RSA_R_KEY_SIZE_TOO_SMALL);
+ return -1;
+ }
+#endif
+
if((ctx = BN_CTX_new()) == NULL) goto err;
BN_CTX_start(ctx);
- f = BN_CTX_get(ctx);
+ f = BN_CTX_get(ctx);
+ br = BN_CTX_get(ctx);
ret = BN_CTX_get(ctx);
- num=BN_num_bytes(rsa->n);
+ num = BN_num_bytes(rsa->n);
buf = OPENSSL_malloc(num);
if(!f || !ret || !buf)
{
goto err;
}
- BLINDING_HELPER(rsa, ctx, goto err;);
- blinding = rsa->blinding;
-
- /* Now unless blinding is disabled, 'blinding' is non-NULL.
- * But the BN_BLINDING object may be owned by some other thread
- * (we don't want to keep it constant and we don't want to use
- * lots of locking to avoid race conditions, so only a single
- * thread can use it; other threads have to use local blinding
- * factors) */
if (!(rsa->flags & RSA_FLAG_NO_BLINDING))
{
+ blinding = rsa_get_blinding(rsa, &local_blinding, ctx);
if (blinding == NULL)
{
RSAerr(RSA_F_RSA_EAY_PRIVATE_DECRYPT, ERR_R_INTERNAL_ERROR);
}
if (blinding != NULL)
- {
- if (blinding->thread_id != CRYPTO_thread_id())
- {
- /* we need a local one-time blinding factor */
-
- blinding = setup_blinding(rsa, ctx);
- if (blinding == NULL)
- goto err;
- local_blinding = 1;
- }
- }
-
- if (blinding)
- if (!BN_BLINDING_convert(f, blinding, ctx)) goto err;
+ if (!rsa_blinding_convert(blinding, local_blinding, f, br, ctx))
+ goto err;
/* do the decrypt */
if ( (rsa->flags & RSA_FLAG_EXT_PKEY) ||
(rsa->dmp1 != NULL) &&
(rsa->dmq1 != NULL) &&
(rsa->iqmp != NULL)) )
- { if (!rsa->meth->rsa_mod_exp(ret,f,rsa,ctx)) goto err; }
+ {
+ if (!rsa->meth->rsa_mod_exp(ret, f, rsa, ctx)) goto err;
+ }
else
{
- MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err);
- if (!rsa->meth->bn_mod_exp(ret,f,rsa->d,rsa->n,ctx,
+ BIGNUM local_d;
+ BIGNUM *d = NULL;
+
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ d = &local_d;
+ BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+ }
+ else
+ d = rsa->d;
+
+ if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+ if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+ goto err;
+ if (!rsa->meth->bn_mod_exp(ret,f,d,rsa->n,ctx,
rsa->_method_mod_n))
- goto err;
+ goto err;
}
if (blinding)
- if (!BN_BLINDING_invert(ret, blinding, ctx)) goto err;
+ if (!rsa_blinding_invert(blinding, local_blinding, ret, br, ctx))
+ goto err;
p=buf;
j=BN_bn2bin(ret,p); /* j is only used with no-padding mode */
r=RSA_padding_check_PKCS1_type_2(to,num,buf,j,num);
break;
#ifndef OPENSSL_NO_SHA
- case RSA_PKCS1_OAEP_PADDING:
+ case RSA_PKCS1_OAEP_PADDING:
r=RSA_padding_check_PKCS1_OAEP(to,num,buf,j,num,NULL,0);
- break;
+ break;
#endif
case RSA_SSLV23_PADDING:
r=RSA_padding_check_SSLv23(to,num,buf,j,num);
BN_CTX_end(ctx);
BN_CTX_free(ctx);
}
- if (local_blinding)
- BN_BLINDING_free(blinding);
if (buf != NULL)
{
OPENSSL_cleanse(buf,num);
unsigned char *buf=NULL;
BN_CTX *ctx=NULL;
+#ifdef OPENSSL_FIPS
+ if(FIPS_selftest_failed())
+ {
+ FIPSerr(FIPS_F_RSA_EAY_PUBLIC_DECRYPT,FIPS_R_FIPS_SELFTEST_FAILED);
+ goto err;
+ }
+
+ if (FIPS_module_mode() && !(rsa->flags & RSA_FLAG_NON_FIPS_ALLOW)
+ && (BN_num_bits(rsa->n) < OPENSSL_RSA_FIPS_MIN_MODULUS_BITS))
+ {
+ RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_KEY_SIZE_TOO_SMALL);
+ return -1;
+ }
+#endif
+
+ if (BN_num_bits(rsa->n) > OPENSSL_RSA_MAX_MODULUS_BITS)
+ {
+ RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_MODULUS_TOO_LARGE);
+ return -1;
+ }
+
+ if (BN_ucmp(rsa->n, rsa->e) <= 0)
+ {
+ RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE);
+ return -1;
+ }
+
+ /* for large moduli, enforce exponent limit */
+ if (BN_num_bits(rsa->n) > OPENSSL_RSA_SMALL_MODULUS_BITS)
+ {
+ if (BN_num_bits(rsa->e) > OPENSSL_RSA_MAX_PUBEXP_BITS)
+ {
+ RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_BAD_E_VALUE);
+ return -1;
+ }
+ }
+
if((ctx = BN_CTX_new()) == NULL) goto err;
BN_CTX_start(ctx);
f = BN_CTX_get(ctx);
goto err;
}
- MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err);
+ if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+ if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+ goto err;
if (!rsa->meth->bn_mod_exp(ret,f,rsa->e,rsa->n,ctx,
rsa->_method_mod_n)) goto err;
+ if ((padding == RSA_X931_PADDING) && ((ret->d[0] & 0xf) != 12))
+ if (!BN_sub(ret, rsa->n, ret)) goto err;
+
p=buf;
i=BN_bn2bin(ret,p);
case RSA_PKCS1_PADDING:
r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num);
break;
+ case RSA_X931_PADDING:
+ r=RSA_padding_check_X931(to,num,buf,i,num);
+ break;
case RSA_NO_PADDING:
r=RSA_padding_check_none(to,num,buf,i,num);
break;
static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
{
BIGNUM *r1,*m1,*vrfy;
+ BIGNUM local_dmp1,local_dmq1,local_c,local_r1;
+ BIGNUM *dmp1,*dmq1,*c,*pr1;
int ret=0;
BN_CTX_start(ctx);
m1 = BN_CTX_get(ctx);
vrfy = BN_CTX_get(ctx);
- MONT_HELPER(rsa, ctx, p, rsa->flags & RSA_FLAG_CACHE_PRIVATE, goto err);
- MONT_HELPER(rsa, ctx, q, rsa->flags & RSA_FLAG_CACHE_PRIVATE, goto err);
- MONT_HELPER(rsa, ctx, n, rsa->flags & RSA_FLAG_CACHE_PUBLIC, goto err);
+ {
+ BIGNUM local_p, local_q;
+ BIGNUM *p = NULL, *q = NULL;
+
+ /* Make sure BN_mod_inverse in Montgomery intialization uses the
+ * BN_FLG_CONSTTIME flag (unless RSA_FLAG_NO_CONSTTIME is set)
+ */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ BN_init(&local_p);
+ p = &local_p;
+ BN_with_flags(p, rsa->p, BN_FLG_CONSTTIME);
- if (!BN_mod(r1,I,rsa->q,ctx)) goto err;
- if (!rsa->meth->bn_mod_exp(m1,r1,rsa->dmq1,rsa->q,ctx,
+ BN_init(&local_q);
+ q = &local_q;
+ BN_with_flags(q, rsa->q, BN_FLG_CONSTTIME);
+ }
+ else
+ {
+ p = rsa->p;
+ q = rsa->q;
+ }
+
+ if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
+ {
+ if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_p, CRYPTO_LOCK_RSA, p, ctx))
+ goto err;
+ if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_q, CRYPTO_LOCK_RSA, q, ctx))
+ goto err;
+ }
+ }
+
+ if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
+ if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n, CRYPTO_LOCK_RSA, rsa->n, ctx))
+ goto err;
+
+ /* compute I mod q */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ c = &local_c;
+ BN_with_flags(c, I, BN_FLG_CONSTTIME);
+ if (!BN_mod(r1,c,rsa->q,ctx)) goto err;
+ }
+ else
+ {
+ if (!BN_mod(r1,I,rsa->q,ctx)) goto err;
+ }
+
+ /* compute r1^dmq1 mod q */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ dmq1 = &local_dmq1;
+ BN_with_flags(dmq1, rsa->dmq1, BN_FLG_CONSTTIME);
+ }
+ else
+ dmq1 = rsa->dmq1;
+ if (!rsa->meth->bn_mod_exp(m1,r1,dmq1,rsa->q,ctx,
rsa->_method_mod_q)) goto err;
- if (!BN_mod(r1,I,rsa->p,ctx)) goto err;
- if (!rsa->meth->bn_mod_exp(r0,r1,rsa->dmp1,rsa->p,ctx,
+ /* compute I mod p */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ c = &local_c;
+ BN_with_flags(c, I, BN_FLG_CONSTTIME);
+ if (!BN_mod(r1,c,rsa->p,ctx)) goto err;
+ }
+ else
+ {
+ if (!BN_mod(r1,I,rsa->p,ctx)) goto err;
+ }
+
+ /* compute r1^dmp1 mod p */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ dmp1 = &local_dmp1;
+ BN_with_flags(dmp1, rsa->dmp1, BN_FLG_CONSTTIME);
+ }
+ else
+ dmp1 = rsa->dmp1;
+ if (!rsa->meth->bn_mod_exp(r0,r1,dmp1,rsa->p,ctx,
rsa->_method_mod_p)) goto err;
if (!BN_sub(r0,r0,m1)) goto err;
/* This will help stop the size of r0 increasing, which does
* affect the multiply if it optimised for a power of 2 size */
- if (BN_get_sign(r0))
+ if (BN_is_negative(r0))
if (!BN_add(r0,r0,rsa->p)) goto err;
if (!BN_mul(r1,r0,rsa->iqmp,ctx)) goto err;
- if (!BN_mod(r0,r1,rsa->p,ctx)) goto err;
+
+ /* Turn BN_FLG_CONSTTIME flag on before division operation */
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ pr1 = &local_r1;
+ BN_with_flags(pr1, r1, BN_FLG_CONSTTIME);
+ }
+ else
+ pr1 = r1;
+ if (!BN_mod(r0,pr1,rsa->p,ctx)) goto err;
+
/* If p < q it is occasionally possible for the correction of
- * adding 'p' if r0 is negative above to leave the result still
+ * adding 'p' if r0 is negative above to leave the result still
* negative. This can break the private key operations: the following
* second correction should *always* correct this rare occurrence.
* This will *never* happen with OpenSSL generated keys because
- * they ensure p > q [steve]
- */
- if (BN_get_sign(r0))
+ * they ensure p > q [steve]
+ */
+ if (BN_is_negative(r0))
if (!BN_add(r0,r0,rsa->p)) goto err;
if (!BN_mul(r1,r0,rsa->q,ctx)) goto err;
if (!BN_add(r0,r1,m1)) goto err;
* for absolute equality, just congruency. */
if (!BN_sub(vrfy, vrfy, I)) goto err;
if (!BN_mod(vrfy, vrfy, rsa->n, ctx)) goto err;
- if (BN_get_sign(vrfy))
+ if (BN_is_negative(vrfy))
if (!BN_add(vrfy, vrfy, rsa->n)) goto err;
if (!BN_is_zero(vrfy))
+ {
/* 'I' and 'vrfy' aren't congruent mod n. Don't leak
* miscalculated CRT output, just do a raw (slower)
* mod_exp and return that instead. */
- if (!rsa->meth->bn_mod_exp(r0,I,rsa->d,rsa->n,ctx,
- rsa->_method_mod_n)) goto err;
+
+ BIGNUM local_d;
+ BIGNUM *d = NULL;
+
+ if (!(rsa->flags & RSA_FLAG_NO_CONSTTIME))
+ {
+ d = &local_d;
+ BN_with_flags(d, rsa->d, BN_FLG_CONSTTIME);
+ }
+ else
+ d = rsa->d;
+ if (!rsa->meth->bn_mod_exp(r0,I,d,rsa->n,ctx,
+ rsa->_method_mod_n)) goto err;
+ }
}
ret=1;
err:
static int RSA_eay_init(RSA *rsa)
{
+#ifdef OPENSSL_FIPS
+ if(FIPS_selftest_failed())
+ {
+ FIPSerr(FIPS_F_RSA_EAY_INIT,FIPS_R_FIPS_SELFTEST_FAILED);
+ return 0;
+ }
+#endif
rsa->flags|=RSA_FLAG_CACHE_PUBLIC|RSA_FLAG_CACHE_PRIVATE;
return(1);
}
projects / openssl.git / blobdiff