X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fbn%2Fbn_blind.c;h=e060592fdc53415dc407b12d835fc4d5a986798e;hp=a7b34f0bf07954062f462c076ca42a842fccd396;hb=d70323f1c5fcc8845a2edf48b49178526b7b0305;hpb=78414a6a897db42c9bcf06aa21c705811ab33921

diff --git a/crypto/bn/bn_blind.c b/crypto/bn/bn_blind.c
index a7b34f0bf0..e060592fdc 100644
--- a/crypto/bn/bn_blind.c
+++ b/crypto/bn/bn_blind.c
@@ -1,4 +1,57 @@
 /* crypto/bn/bn_blind.c */
+/* ====================================================================
+ * 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).
+ *
+ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -60,84 +113,264 @@
 #include "cryptlib.h"
 #include "bn_lcl.h"
 
-BN_BLINDING *BN_BLINDING_new(A,Ai,mod)
-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 */
+#ifndef OPENSSL_NO_DEPRECATED
+	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 */
+#endif
+	CRYPTO_THREADID tid;
+	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, BIGNUM *mod)
 	{
 	BN_BLINDING *ret=NULL;
 
-	if ((ret=(BN_BLINDING *)Malloc(sizeof(BN_BLINDING))) == NULL)
+	bn_check_top(mod);
+
+	if ((ret=(BN_BLINDING *)OPENSSL_malloc(sizeof(BN_BLINDING))) == NULL)
+		{
 		BNerr(BN_F_BN_BLINDING_NEW,ERR_R_MALLOC_FAILURE);
+		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;
+	CRYPTO_THREADID_current(&ret->tid);
 	return(ret);
 err:
 	if (ret != NULL) BN_BLINDING_free(ret);
-	return(ret);
+	return(NULL);
 	}
 
-void BN_BLINDING_free(r)
-BN_BLINDING *r;
+void BN_BLINDING_free(BN_BLINDING *r)
 	{
+	if(r == NULL)
+	    return;
+
 	if (r->A  != NULL) BN_free(r->A );
 	if (r->Ai != NULL) BN_free(r->Ai);
-	Free(r);
+	if (r->e  != NULL) BN_free(r->e );
+	if (r->mod != NULL) BN_free(r->mod); 
+	OPENSSL_free(r);
 	}
 
-int BN_BLINDING_update(b,ctx)
-BN_BLINDING *b;
-BN_CTX *ctx;
+int BN_BLINDING_update(BN_BLINDING *b, BN_CTX *ctx)
 	{
 	int ret=0;
 
 	if ((b->A == NULL) || (b->Ai == NULL))
 		{
-		BNerr(BN_F_BN_BLINDING_UPDATE,BN_R_NOT_INITALISED);
+		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(n,b,ctx)
-BIGNUM *n;
-BN_BLINDING *b;
-BN_CTX *ctx;
+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_INITALISED);
+		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(n,b,ctx)
-BIGNUM *n;
-BN_BLINDING *b;
-BN_CTX *ctx;
+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_INITALISED);
+		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);
 	}
 
+#ifndef OPENSSL_NO_DEPRECATED
+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;
+	}
+#endif
+
+CRYPTO_THREADID *BN_BLINDING_thread_id(BN_BLINDING *b)
+	{
+	return &b->tid;
+	}
+
+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, 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;
+}