130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/*
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* Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include "dsa_locl.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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struct DSA_SIG_st {
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BIGNUM *r;
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BIGNUM *s;
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};
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ASN1_SEQUENCE(DSA_SIG) = {
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ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
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ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
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} static_ASN1_SEQUENCE_END(DSA_SIG)
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IMPLEMENT_ASN1_FUNCTIONS_const(DSA_SIG)
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void DSA_SIG_get0(BIGNUM **pr, BIGNUM **ps, const DSA_SIG *sig)
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{
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*pr = sig->r;
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*ps = sig->s;
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}
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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 != NULL)
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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, CBIGNUM)
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} static_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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} static_ASN1_SEQUENCE_END_cb(DSA, DSAparams)
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IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)
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ASN1_SEQUENCE_cb(DSAPublicKey, dsa_cb) = {
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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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} static_ASN1_SEQUENCE_END_cb(DSA, DSAPublicKey)
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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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OPENSSL_clear_free(der, derlen);
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DSA_SIG_free(s);
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return (ret);
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}
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