-/* crypto/dsa/dsa_vrf.c */
-/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * 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 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 acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS 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 AUTHOR OR 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-/* Origional version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
+/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
-#include <stdio.h>
-#include "cryptlib.h"
-#include "bn.h"
-#include "dsa.h"
-#include "rand.h"
-#include "asn1.h"
-#include "asn1_mac.h"
+#include "internal/cryptlib.h"
+#include "dsa_locl.h"
-/* data has already been hashed (probably with SHA or SHA-1). */
-/* returns
- * 1: correct signature
- * 0: incorrect signature
- * -1: error
- */
-int DSA_verify(type,dgst,dgst_len,sigbuf,siglen, dsa)
-int type;
-unsigned char *dgst;
-int dgst_len;
-unsigned char *sigbuf;
-int siglen;
-DSA *dsa;
- {
- /* The next 3 are used by the M_ASN1 macros */
- long length=siglen;
- ASN1_CTX c;
- unsigned char **pp= &sigbuf;
- BN_CTX *ctx;
- BIGNUM *r=NULL;
- BIGNUM *t1=NULL,*t2=NULL;
- BIGNUM *u1=NULL,*u2=NULL;
- ASN1_INTEGER *bs=NULL;
- int ret = -1;
-
- ctx=BN_CTX_new();
- if (ctx == NULL) goto err;
-
- t1=BN_new();
- t2=BN_new();
- if (t1 == NULL || t2 == NULL) goto err;
-
- M_ASN1_D2I_Init();
- M_ASN1_D2I_start_sequence();
- M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
- if ((r=BN_bin2bn(bs->data,bs->length,NULL)) == NULL) goto err_bn;
- M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
- if ((u1=BN_bin2bn(bs->data,bs->length,NULL)) == NULL) goto err_bn;
- if (!asn1_Finish(&c)) goto err;
-
- /* Calculate W = inv(S) mod Q
- * save W in u2 */
- if ((u2=BN_mod_inverse(u1,dsa->q,ctx)) == NULL) goto err_bn;
-
- /* save M in u1 */
- if (BN_bin2bn(dgst,dgst_len,u1) == NULL) goto err_bn;
-
- /* u1 = M * w mod q */
- if (!BN_mod_mul(u1,u1,u2,dsa->q,ctx)) goto err_bn;
-
- /* u2 = r * w mod q */
- if (!BN_mod_mul(u2,r,u2,dsa->q,ctx)) goto err_bn;
-
- /* v = ( g^u1 * y^u2 mod p ) mod q */
- /* let t1 = g ^ u1 mod p */
- if (!BN_mod_exp(t1,dsa->g,u1,dsa->p,ctx)) goto err_bn;
- /* let t2 = y ^ u2 mod p */
- if (!BN_mod_exp(t2,dsa->pub_key,u2,dsa->p,ctx)) goto err_bn;
- /* let u1 = t1 * t2 mod p */
- if (!BN_mod_mul(u1,t1,t2,dsa->p,ctx)) goto err_bn;
- /* let u1 = u1 mod q */
- if (!BN_mod(u1,u1,dsa->q,ctx)) goto err_bn;
- /* V is now in u1. If the signature is correct, it will be
- * equal to R. */
- ret=(BN_ucmp(u1, r) == 0);
- if (0)
- {
-err: /* ASN1 error */
- DSAerr(DSA_F_DSA_VERIFY,c.error);
- }
- if (0)
- {
-err_bn: /* BN error */
- DSAerr(DSA_F_DSA_VERIFY,ERR_R_BN_LIB);
- }
- if (ctx != NULL) BN_CTX_free(ctx);
- if (r != NULL) BN_free(r);
- if (t1 != NULL) BN_free(t1);
- if (t2 != NULL) BN_free(t2);
- if (u1 != NULL) BN_free(u1);
- if (u2 != NULL) BN_free(u2);
- if (bs != NULL) ASN1_BIT_STRING_free(bs);
- return(ret);
- }
+int DSA_do_verify(const unsigned char *dgst, int dgst_len, DSA_SIG *sig,
+ DSA *dsa)
+{
+ return dsa->meth->dsa_do_verify(dgst, dgst_len, sig, dsa);
+}
projects / openssl.git / blobdiff