1 files changed, 235 insertions, 14 deletions

diff --git a/src/lib/libcrypto/bn/bn_blind.c b/src/lib/libcrypto/bn/bn_blind.c
index 2d287e6d1b..c11fb4ccc2 100644
--- a/src/lib/libcrypto/bn/bn_blind.c
+++ b/src/lib/libcrypto/bn/bn_blind.c
@@ -1,4 +1,57 @@
 /* crypto/bn/bn_blind.c */
+/* ====================================================================
+ * 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).
+ *
+ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -60,11 +113,28 @@
 #include "cryptlib.h"
 #include "bn_lcl.h"
 
-BN_BLINDING *BN_BLINDING_new(BIGNUM *A, BIGNUM *Ai, BIGNUM *mod)
+#define BN_BLINDING_COUNTER     32
+
+struct bn_blinding_st
+        {
+        BIGNUM *A;
+        BIGNUM *Ai;
+        BIGNUM *e;
+        BIGNUM *mod; /* just a reference */
+        unsigned long thread_id; /* added in OpenSSL 0.9.6j and 0.9.7b;
+                                  * used only by crypto/rsa/rsa_eay.c, rsa_lib.c */
+        unsigned int  counter;
+        unsigned long flags;
+        BN_MONT_CTX *m_ctx;
+        int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+                          const BIGNUM *m, BN_CTX *ctx,
+                          BN_MONT_CTX *m_ctx);
+        };
+
+BN_BLINDING *BN_BLINDING_new(const BIGNUM *A, const BIGNUM *Ai, /* const */ BIGNUM *mod)
         {
         BN_BLINDING *ret=NULL;
 
-        bn_check_top(Ai);
         bn_check_top(mod);
 
         if ((ret=(BN_BLINDING *)OPENSSL_malloc(sizeof(BN_BLINDING))) == NULL)
@@ -73,11 +143,21 @@ BN_BLINDING *BN_BLINDING_new(BIGNUM *A, BIGNUM *Ai, BIGNUM *mod)
                 return(NULL);
                 }
         memset(ret,0,sizeof(BN_BLINDING));
-        if ((ret->A=BN_new()) == NULL) goto err;
-        if ((ret->Ai=BN_new()) == NULL) goto err;
-        if (!BN_copy(ret->A,A)) goto err;
-        if (!BN_copy(ret->Ai,Ai)) goto err;
-        ret->mod=mod;
+        if (A != NULL)
+                {
+                if ((ret->A  = BN_dup(A))  == NULL) goto err;
+                }
+        if (Ai != NULL)
+                {
+                if ((ret->Ai = BN_dup(Ai)) == NULL) goto err;
+                }
+
+        /* save a copy of mod in the BN_BLINDING structure */
+        if ((ret->mod = BN_dup(mod)) == NULL) goto err;
+        if (BN_get_flags(mod, BN_FLG_CONSTTIME) != 0)
+                BN_set_flags(ret->mod, BN_FLG_CONSTTIME);
+
+        ret->counter = BN_BLINDING_COUNTER;
         return(ret);
 err:
         if (ret != NULL) BN_BLINDING_free(ret);
@@ -91,6 +171,8 @@ void BN_BLINDING_free(BN_BLINDING *r)
 
         if (r->A  != NULL) BN_free(r->A );
         if (r->Ai != NULL) BN_free(r->Ai);
+        if (r->e  != NULL) BN_free(r->e );
+        if (r->mod != NULL) BN_free(r->mod); 
         OPENSSL_free(r);
         }
 
@@ -103,42 +185,181 @@ int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx)
                 BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITIALIZED);
                 goto err;
                 }
-                
-        if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err;
-        if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err;
+
+        if (--(b->counter) == 0 && b->e != NULL &&
+                !(b->flags & BN_BLINDING_NO_RECREATE))
+                {
+                /* re-create blinding parameters */
+                if (!BN_BLINDING_create_param(b, NULL, NULL, ctx, NULL, NULL))
+                        goto err;
+                }
+        else if (!(b->flags & BN_BLINDING_NO_UPDATE))
+                {
+                if (!BN_mod_mul(b->A,b->A,b->A,b->mod,ctx)) goto err;
+                if (!BN_mod_mul(b->Ai,b->Ai,b->Ai,b->mod,ctx)) goto err;
+                }
 
         ret=1;
 err:
+        if (b->counter == 0)
+                b->counter = BN_BLINDING_COUNTER;
         return(ret);
         }
 
 int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
         {
+        return BN_BLINDING_convert_ex(n, NULL, b, ctx);
+        }
+
+int BN_BLINDING_convert_ex(BIGNUM *n, BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
+        {
+        int ret = 1;
+
         bn_check_top(n);
 
         if ((b->A == NULL) || (b->Ai == NULL))
                 {
-                BNerr(BN_F_BN_BLINDING_CONVERT,BN_R_NOT_INITIALIZED);
+                BNerr(BN_F_BN_BLINDING_CONVERT_EX,BN_R_NOT_INITIALIZED);
                 return(0);
                 }
-        return(BN_mod_mul(n,n,b->A,b->mod,ctx));
+
+        if (r != NULL)
+                {
+                if (!BN_copy(r, b->Ai)) ret=0;
+                }
+
+        if (!BN_mod_mul(n,n,b->A,b->mod,ctx)) ret=0;
+        
+        return ret;
         }
 
 int BN_BLINDING_invert(BIGNUM *n, BN_BLINDING *b, BN_CTX *ctx)
         {
+        return BN_BLINDING_invert_ex(n, NULL, b, ctx);
+        }
+
+int BN_BLINDING_invert_ex(BIGNUM *n, const BIGNUM *r, BN_BLINDING *b, BN_CTX *ctx)
+        {
         int ret;
 
         bn_check_top(n);
         if ((b->A == NULL) || (b->Ai == NULL))
                 {
-                BNerr(BN_F_BN_BLINDING_INVERT,BN_R_NOT_INITIALIZED);
+                BNerr(BN_F_BN_BLINDING_INVERT_EX,BN_R_NOT_INITIALIZED);
                 return(0);
                 }
-        if ((ret=BN_mod_mul(n,n,b->Ai,b->mod,ctx)) >= 0)
+
+        if (r != NULL)
+                ret = BN_mod_mul(n, n, r, b->mod, ctx);
+        else
+                ret = BN_mod_mul(n, n, b->Ai, b->mod, ctx);
+
+        if (ret >= 0)
                 {
                 if (!BN_BLINDING_update(b,ctx))
                         return(0);
                 }
+        bn_check_top(n);
         return(ret);
         }
 
+unsigned long BN_BLINDING_get_thread_id(const BN_BLINDING *b)
+        {
+        return b->thread_id;
+        }
+
+void BN_BLINDING_set_thread_id(BN_BLINDING *b, unsigned long n)
+        {
+        b->thread_id = n;
+        }
+
+unsigned long BN_BLINDING_get_flags(const BN_BLINDING *b)
+        {
+        return b->flags;
+        }
+
+void BN_BLINDING_set_flags(BN_BLINDING *b, unsigned long flags)
+        {
+        b->flags = flags;
+        }
+
+BN_BLINDING *BN_BLINDING_create_param(BN_BLINDING *b,
+        const BIGNUM *e, /* const */ BIGNUM *m, BN_CTX *ctx,
+        int (*bn_mod_exp)(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+                          const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx),
+        BN_MONT_CTX *m_ctx)
+{
+        int    retry_counter = 32;
+        BN_BLINDING *ret = NULL;
+
+        if (b == NULL)
+                ret = BN_BLINDING_new(NULL, NULL, m);
+        else
+                ret = b;
+
+        if (ret == NULL)
+                goto err;
+
+        if (ret->A  == NULL && (ret->A  = BN_new()) == NULL)
+                goto err;
+        if (ret->Ai == NULL && (ret->Ai = BN_new()) == NULL)
+                goto err;
+
+        if (e != NULL)
+                {
+                if (ret->e != NULL)
+                        BN_free(ret->e);
+                ret->e = BN_dup(e);
+                }
+        if (ret->e == NULL)
+                goto err;
+
+        if (bn_mod_exp != NULL)
+                ret->bn_mod_exp = bn_mod_exp;
+        if (m_ctx != NULL)
+                ret->m_ctx = m_ctx;
+
+        do {
+                if (!BN_rand_range(ret->A, ret->mod)) goto err;
+                if (BN_mod_inverse(ret->Ai, ret->A, ret->mod, ctx) == NULL)
+                        {
+                        /* this should almost never happen for good RSA keys */
+                        unsigned long error = ERR_peek_last_error();
+                        if (ERR_GET_REASON(error) == BN_R_NO_INVERSE)
+                                {
+                                if (retry_counter-- == 0)
+                                {
+                                        BNerr(BN_F_BN_BLINDING_CREATE_PARAM,
+                                                BN_R_TOO_MANY_ITERATIONS);
+                                        goto err;
+                                }
+                                ERR_clear_error();
+                                }
+                        else
+                                goto err;
+                        }
+                else
+                        break;
+        } while (1);
+
+        if (ret->bn_mod_exp != NULL && ret->m_ctx != NULL)
+                {
+                if (!ret->bn_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx, ret->m_ctx))
+                        goto err;
+                }
+        else
+                {
+                if (!BN_mod_exp(ret->A, ret->A, ret->e, ret->mod, ctx))
+                        goto err;
+                }
+
+        return ret;
+err:
+        if (b == NULL && ret != NULL)
+                {
+                BN_BLINDING_free(ret);
+                ret = NULL;
+                }
+
+        return ret;
+}