1 files changed, 147 insertions, 100 deletions

diff --git a/src/lib/libcrypto/rsa/rsa_eay.c b/src/lib/libcrypto/rsa/rsa_eay.c
index d4caab3f95..be4ac96ce3 100644
--- a/src/lib/libcrypto/rsa/rsa_eay.c
+++ b/src/lib/libcrypto/rsa/rsa_eay.c
@@ -55,6 +55,59 @@
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
+/* ====================================================================
+ * Copyright (c) 1998-2005 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).
+ *
+ */
 
 #include <stdio.h>
 #include "cryptlib.h"
@@ -145,30 +198,13 @@ static int RSA_eay_public_encrypt(int flen, const unsigned char *from,
                 goto err;
                 }
 
-        if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
+        if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
                 {
-                BN_MONT_CTX* bn_mont_ctx;
-                if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
-                        goto err;
-                if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->n,ctx))
-                        {
-                        BN_MONT_CTX_free(bn_mont_ctx);
+                if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n,
+                                        CRYPTO_LOCK_RSA, rsa->n, ctx))
                         goto err;
-                        }
-                if (rsa->_method_mod_n == NULL) /* other thread may have finished first */
-                        {
-                        CRYPTO_w_lock(CRYPTO_LOCK_RSA);
-                        if (rsa->_method_mod_n == NULL)
-                                {
-                                rsa->_method_mod_n = bn_mont_ctx;
-                                bn_mont_ctx = NULL;
-                                }
-                        CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
-                        }
-                if (bn_mont_ctx)
-                        BN_MONT_CTX_free(bn_mont_ctx);
                 }
-                
+
         if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->e,rsa->n,ctx,
                 rsa->_method_mod_n)) goto err;
 
@@ -249,7 +285,7 @@ err:
 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, *res;
         int i,j,k,num=0,r= -1;
         unsigned char *buf=NULL;
         BN_CTX *ctx=NULL;
@@ -331,19 +367,43 @@ static int RSA_eay_private_encrypt(int flen, const unsigned char *from,
                 (rsa->dmp1 != NULL) &&
                 (rsa->dmq1 != NULL) &&
                 (rsa->iqmp != NULL)) )
-                { if (!rsa->meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
+                { 
+                if (!rsa->meth->rsa_mod_exp(&ret,&f,rsa)) goto err;
+                }
         else
                 {
-                if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL)) goto err;
+                BIGNUM local_d;
+                BIGNUM *d = NULL;
+                
+                if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME))
+                        {
+                        BN_init(&local_d);
+                        d = &local_d;
+                        BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME);
+                        }
+                else
+                        d = rsa->d;
+                if (!rsa->meth->bn_mod_exp(&ret,&f,d,rsa->n,ctx,NULL)) goto err;
                 }
 
         if (blinding)
                 if (!BN_BLINDING_invert(&ret, blinding, 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;
 
@@ -444,10 +504,22 @@ static int RSA_eay_private_decrypt(int flen, const unsigned char *from,
                 (rsa->dmp1 != NULL) &&
                 (rsa->dmq1 != NULL) &&
                 (rsa->iqmp != NULL)) )
-                { if (!rsa->meth->rsa_mod_exp(&ret,&f,rsa)) goto err; }
+                {
+                if (!rsa->meth->rsa_mod_exp(&ret,&f,rsa)) goto err;
+                }
         else
                 {
-                if (!rsa->meth->bn_mod_exp(&ret,&f,rsa->d,rsa->n,ctx,NULL))
+                BIGNUM local_d;
+                BIGNUM *d = NULL;
+                
+                if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME))
+                        {
+                        d = &local_d;
+                        BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME);
+                        }
+                else
+                        d = rsa->d;
+                if (!rsa->meth->bn_mod_exp(&ret,&f,d,rsa->n,ctx,NULL))
                         goto err;
                 }
 
@@ -534,33 +606,20 @@ static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
                 }
 
         /* do the decrypt */
-        if ((rsa->_method_mod_n == NULL) && (rsa->flags & RSA_FLAG_CACHE_PUBLIC))
+
+        if (rsa->flags & RSA_FLAG_CACHE_PUBLIC)
                 {
-                BN_MONT_CTX* bn_mont_ctx;
-                if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
-                        goto err;
-                if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->n,ctx))
-                        {
-                        BN_MONT_CTX_free(bn_mont_ctx);
+                if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_n,
+                                        CRYPTO_LOCK_RSA, rsa->n, ctx))
                         goto err;
-                        }
-                if (rsa->_method_mod_n == NULL) /* other thread may have finished first */
-                        {
-                        CRYPTO_w_lock(CRYPTO_LOCK_RSA);
-                        if (rsa->_method_mod_n == NULL)
-                                {
-                                rsa->_method_mod_n = bn_mont_ctx;
-                                bn_mont_ctx = NULL;
-                                }
-                        CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
-                        }
-                if (bn_mont_ctx)
-                        BN_MONT_CTX_free(bn_mont_ctx);
                 }
-                
+
         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))
+                BN_sub(&ret, rsa->n, &ret);
+
         p=buf;
         i=BN_bn2bin(&ret,p);
 
@@ -594,6 +653,8 @@ err:
 static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
         {
         BIGNUM r1,m1,vrfy;
+        BIGNUM local_dmp1, local_dmq1;
+        BIGNUM *dmp1, *dmq1;
         int ret=0;
         BN_CTX *ctx;
 
@@ -604,61 +665,34 @@ static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
 
         if (rsa->flags & RSA_FLAG_CACHE_PRIVATE)
                 {
-                if (rsa->_method_mod_p == NULL)
-                        {
-                        BN_MONT_CTX* bn_mont_ctx;
-                        if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
-                                goto err;
-                        if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->p,ctx))
-                                {
-                                BN_MONT_CTX_free(bn_mont_ctx);
-                                goto err;
-                                }
-                        if (rsa->_method_mod_p == NULL) /* other thread may have finished first */
-                                {
-                                CRYPTO_w_lock(CRYPTO_LOCK_RSA);
-                                if (rsa->_method_mod_p == NULL)
-                                        {
-                                        rsa->_method_mod_p = bn_mont_ctx;
-                                        bn_mont_ctx = NULL;
-                                        }
-                                CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
-                                }
-                        if (bn_mont_ctx)
-                                BN_MONT_CTX_free(bn_mont_ctx);
-                        }
-
-                if (rsa->_method_mod_q == NULL)
-                        {
-                        BN_MONT_CTX* bn_mont_ctx;
-                        if ((bn_mont_ctx=BN_MONT_CTX_new()) == NULL)
-                                goto err;
-                        if (!BN_MONT_CTX_set(bn_mont_ctx,rsa->q,ctx))
-                                {
-                                BN_MONT_CTX_free(bn_mont_ctx);
-                                goto err;
-                                }
-                        if (rsa->_method_mod_q == NULL) /* other thread may have finished first */
-                                {
-                                CRYPTO_w_lock(CRYPTO_LOCK_RSA);
-                                if (rsa->_method_mod_q == NULL)
-                                        {
-                                        rsa->_method_mod_q = bn_mont_ctx;
-                                        bn_mont_ctx = NULL;
-                                        }
-                                CRYPTO_w_unlock(CRYPTO_LOCK_RSA);
-                                }
-                        if (bn_mont_ctx)
-                                BN_MONT_CTX_free(bn_mont_ctx);
-                        }
+                if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_p,
+                                        CRYPTO_LOCK_RSA, rsa->p, ctx))
+                        goto err;
+                if (!BN_MONT_CTX_set_locked(&rsa->_method_mod_q,
+                                        CRYPTO_LOCK_RSA, rsa->q, ctx))
+                        goto err;
                 }
-                
+
         if (!BN_mod(&r1,I,rsa->q,ctx)) goto err;
-        if (!rsa->meth->bn_mod_exp(&m1,&r1,rsa->dmq1,rsa->q,ctx,
+        if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME))
+                {
+                dmq1 = &local_dmq1;
+                BN_with_flags(dmq1, rsa->dmq1, BN_FLG_EXP_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,
+        if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME))
+                {
+                dmp1 = &local_dmp1;
+                BN_with_flags(dmp1, rsa->dmp1, BN_FLG_EXP_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;
@@ -693,10 +727,23 @@ static int RSA_eay_mod_exp(BIGNUM *r0, const BIGNUM *I, RSA *rsa)
                 if (vrfy.neg)
                         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,NULL)) goto err;
+
+                        BIGNUM local_d;
+                        BIGNUM *d = NULL;
+                
+                        if (!(rsa->flags & RSA_FLAG_NO_EXP_CONSTTIME))
+                                {
+                                d = &local_d;
+                                BN_with_flags(d, rsa->d, BN_FLG_EXP_CONSTTIME);
+                                }
+                        else
+                                d = rsa->d;
+                        if (!rsa->meth->bn_mod_exp(r0,I,d,rsa->n,ctx,NULL)) goto err;
+                        }
                 }
         ret=1;
 err: