2 * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
13 #include <openssl/asn1.h>
14 #include <openssl/asn1t.h>
15 #include <openssl/rand.h>
17 ASN1_SEQUENCE(DSA_SIG) = {
18 ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
19 ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
20 } static_ASN1_SEQUENCE_END(DSA_SIG)
22 IMPLEMENT_ASN1_FUNCTIONS_const(DSA_SIG)
24 void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
32 int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s)
34 if (r == NULL || s == NULL)
36 BN_clear_free(sig->r);
37 BN_clear_free(sig->s);
43 /* Override the default free and new methods */
44 static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
47 if (operation == ASN1_OP_NEW_PRE) {
48 *pval = (ASN1_VALUE *)DSA_new();
52 } else if (operation == ASN1_OP_FREE_PRE) {
53 DSA_free((DSA *)*pval);
60 ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = {
61 ASN1_SIMPLE(DSA, version, LONG),
62 ASN1_SIMPLE(DSA, p, BIGNUM),
63 ASN1_SIMPLE(DSA, q, BIGNUM),
64 ASN1_SIMPLE(DSA, g, BIGNUM),
65 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
66 ASN1_SIMPLE(DSA, priv_key, CBIGNUM)
67 } static_ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)
69 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey)
71 ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = {
72 ASN1_SIMPLE(DSA, p, BIGNUM),
73 ASN1_SIMPLE(DSA, q, BIGNUM),
74 ASN1_SIMPLE(DSA, g, BIGNUM),
75 } static_ASN1_SEQUENCE_END_cb(DSA, DSAparams)
77 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)
79 ASN1_SEQUENCE_cb(DSAPublicKey, dsa_cb) = {
80 ASN1_SIMPLE(DSA, pub_key, BIGNUM),
81 ASN1_SIMPLE(DSA, p, BIGNUM),
82 ASN1_SIMPLE(DSA, q, BIGNUM),
83 ASN1_SIMPLE(DSA, g, BIGNUM)
84 } static_ASN1_SEQUENCE_END_cb(DSA, DSAPublicKey)
86 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
88 DSA *DSAparams_dup(DSA *dsa)
90 return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
93 int DSA_sign(int type, const unsigned char *dgst, int dlen,
94 unsigned char *sig, unsigned int *siglen, DSA *dsa)
97 RAND_seed(dgst, dlen);
98 s = DSA_do_sign(dgst, dlen, dsa);
103 *siglen = i2d_DSA_SIG(s, &sig);
108 /* data has already been hashed (probably with SHA or SHA-1). */
111 * 1: correct signature
112 * 0: incorrect signature
115 int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
116 const unsigned char *sigbuf, int siglen, DSA *dsa)
119 const unsigned char *p = sigbuf;
120 unsigned char *der = NULL;
127 if (d2i_DSA_SIG(&s, &p, siglen) == NULL)
129 /* Ensure signature uses DER and doesn't have trailing garbage */
130 derlen = i2d_DSA_SIG(s, &der);
131 if (derlen != siglen || memcmp(sigbuf, der, derlen))
133 ret = DSA_do_verify(dgst, dgst_len, s, dsa);
135 OPENSSL_clear_free(der, derlen);