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202 lines
6.6 KiB
202 lines
6.6 KiB
/* dsa_asn1.c */ |
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/* |
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project |
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* 2000. |
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*/ |
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/* ==================================================================== |
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* Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* licensing@OpenSSL.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This product includes cryptographic software written by Eric Young |
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* (eay@cryptsoft.com). This product includes software written by Tim |
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* Hudson (tjh@cryptsoft.com). |
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* |
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*/ |
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#include <stdio.h> |
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#include "cryptlib.h" |
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#include <openssl/dsa.h> |
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#include <openssl/asn1.h> |
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#include <openssl/asn1t.h> |
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#include <openssl/rand.h> |
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/* Override the default new methods */ |
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static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, |
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void *exarg) |
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{ |
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if (operation == ASN1_OP_NEW_PRE) { |
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DSA_SIG *sig; |
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sig = OPENSSL_malloc(sizeof(DSA_SIG)); |
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if (!sig) { |
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DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE); |
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return 0; |
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} |
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sig->r = NULL; |
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sig->s = NULL; |
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*pval = (ASN1_VALUE *)sig; |
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return 2; |
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} |
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return 1; |
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} |
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ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = { |
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ASN1_SIMPLE(DSA_SIG, r, CBIGNUM), |
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ASN1_SIMPLE(DSA_SIG, s, CBIGNUM) |
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} ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG) |
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA_SIG, DSA_SIG, DSA_SIG) |
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/* Override the default free and new methods */ |
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static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, |
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void *exarg) |
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{ |
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if (operation == ASN1_OP_NEW_PRE) { |
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*pval = (ASN1_VALUE *)DSA_new(); |
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if (*pval) |
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return 2; |
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return 0; |
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} else if (operation == ASN1_OP_FREE_PRE) { |
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DSA_free((DSA *)*pval); |
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*pval = NULL; |
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return 2; |
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} |
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return 1; |
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} |
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ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = { |
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ASN1_SIMPLE(DSA, version, LONG), |
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ASN1_SIMPLE(DSA, p, BIGNUM), |
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ASN1_SIMPLE(DSA, q, BIGNUM), |
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ASN1_SIMPLE(DSA, g, BIGNUM), |
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ASN1_SIMPLE(DSA, pub_key, BIGNUM), |
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ASN1_SIMPLE(DSA, priv_key, BIGNUM) |
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} ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey) |
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey) |
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ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = { |
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ASN1_SIMPLE(DSA, p, BIGNUM), |
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ASN1_SIMPLE(DSA, q, BIGNUM), |
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ASN1_SIMPLE(DSA, g, BIGNUM), |
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} ASN1_SEQUENCE_END_cb(DSA, DSAparams) |
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams) |
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/* |
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* DSA public key is a bit trickier... its effectively a CHOICE type decided |
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* by a field called write_params which can either write out just the public |
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* key as an INTEGER or the parameters and public key in a SEQUENCE |
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*/ |
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ASN1_SEQUENCE(dsa_pub_internal) = { |
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ASN1_SIMPLE(DSA, pub_key, BIGNUM), |
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ASN1_SIMPLE(DSA, p, BIGNUM), |
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ASN1_SIMPLE(DSA, q, BIGNUM), |
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ASN1_SIMPLE(DSA, g, BIGNUM) |
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} ASN1_SEQUENCE_END_name(DSA, dsa_pub_internal) |
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ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = { |
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ASN1_SIMPLE(DSA, pub_key, BIGNUM), |
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ASN1_EX_COMBINE(0, 0, dsa_pub_internal) |
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} ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params) |
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey) |
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DSA *DSAparams_dup(DSA *dsa) |
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{ |
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return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa); |
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} |
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int DSA_sign(int type, const unsigned char *dgst, int dlen, |
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unsigned char *sig, unsigned int *siglen, DSA *dsa) |
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{ |
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DSA_SIG *s; |
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RAND_seed(dgst, dlen); |
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s = DSA_do_sign(dgst, dlen, dsa); |
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if (s == NULL) { |
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*siglen = 0; |
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return (0); |
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} |
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*siglen = i2d_DSA_SIG(s, &sig); |
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DSA_SIG_free(s); |
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return (1); |
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} |
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/* data has already been hashed (probably with SHA or SHA-1). */ |
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/*- |
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* returns |
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* 1: correct signature |
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* 0: incorrect signature |
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* -1: error |
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*/ |
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int DSA_verify(int type, const unsigned char *dgst, int dgst_len, |
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const unsigned char *sigbuf, int siglen, DSA *dsa) |
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{ |
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DSA_SIG *s; |
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const unsigned char *p = sigbuf; |
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unsigned char *der = NULL; |
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int derlen = -1; |
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int ret = -1; |
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s = DSA_SIG_new(); |
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if (s == NULL) |
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return (ret); |
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if (d2i_DSA_SIG(&s, &p, siglen) == NULL) |
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goto err; |
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/* Ensure signature uses DER and doesn't have trailing garbage */ |
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derlen = i2d_DSA_SIG(s, &der); |
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if (derlen != siglen || memcmp(sigbuf, der, derlen)) |
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goto err; |
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ret = DSA_do_verify(dgst, dgst_len, s, dsa); |
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err: |
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if (derlen > 0) { |
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OPENSSL_cleanse(der, derlen); |
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OPENSSL_free(der); |
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} |
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DSA_SIG_free(s); |
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return (ret); |
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}
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