2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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 * DSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
16 #include <openssl/bn.h>
17 #include "internal/cryptlib.h"
18 #include "dsa_local.h"
19 #include "crypto/asn1_dsa.h"
20 #include "crypto/dsa.h"
22 DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa)
24 return dsa->meth->dsa_do_sign(dgst, dlen, dsa);
27 #ifndef OPENSSL_NO_DEPRECATED_3_0
28 int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp)
30 return dsa->meth->dsa_sign_setup(dsa, ctx_in, kinvp, rp);
34 DSA_SIG *DSA_SIG_new(void)
36 DSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
38 DSAerr(DSA_F_DSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
42 void DSA_SIG_free(DSA_SIG *sig)
46 BN_clear_free(sig->r);
47 BN_clear_free(sig->s);
51 DSA_SIG *d2i_DSA_SIG(DSA_SIG **psig, const unsigned char **ppin, long len)
57 if (psig != NULL && *psig != NULL) {
68 if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
69 if (psig == NULL || *psig == NULL)
73 if (psig != NULL && *psig == NULL)
78 int i2d_DSA_SIG(const DSA_SIG *sig, unsigned char **ppout)
85 if (!WPACKET_init_null(&pkt, 0))
87 } else if (*ppout == NULL) {
88 if ((buf = BUF_MEM_new()) == NULL
89 || !WPACKET_init_len(&pkt, buf, 0)) {
94 if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
98 if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
99 || !WPACKET_get_total_written(&pkt, &encoded_len)
100 || !WPACKET_finish(&pkt)) {
102 WPACKET_cleanup(&pkt);
107 if (*ppout == NULL) {
108 *ppout = (unsigned char *)buf->data;
112 *ppout += encoded_len;
116 return (int)encoded_len;
119 int DSA_size(const DSA *dsa)
124 sig.r = sig.s = dsa->params.q;
125 ret = i2d_DSA_SIG(&sig, NULL);
132 void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
140 int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s)
142 if (r == NULL || s == NULL)
144 BN_clear_free(sig->r);
145 BN_clear_free(sig->s);
151 int dsa_sign_int(int type, const unsigned char *dgst,
152 int dlen, unsigned char *sig, unsigned int *siglen, DSA *dsa)
156 /* legacy case uses the method table */
157 if (dsa->libctx == NULL || dsa->meth != DSA_get_default_method())
158 s = DSA_do_sign(dgst, dlen, dsa);
160 s = dsa_do_sign_int(dgst, dlen, dsa);
165 *siglen = i2d_DSA_SIG(s, &sig);
170 int DSA_sign(int type, const unsigned char *dgst, int dlen,
171 unsigned char *sig, unsigned int *siglen, DSA *dsa)
173 return dsa_sign_int(type, dgst, dlen, sig, siglen, dsa);
176 /* data has already been hashed (probably with SHA or SHA-1). */
179 * 1: correct signature
180 * 0: incorrect signature
183 int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
184 const unsigned char *sigbuf, int siglen, DSA *dsa)
187 const unsigned char *p = sigbuf;
188 unsigned char *der = NULL;
195 if (d2i_DSA_SIG(&s, &p, siglen) == NULL)
197 /* Ensure signature uses DER and doesn't have trailing garbage */
198 derlen = i2d_DSA_SIG(s, &der);
199 if (derlen != siglen || memcmp(sigbuf, der, derlen))
201 ret = DSA_do_verify(dgst, dgst_len, s, dsa);
203 OPENSSL_clear_free(der, derlen);