1 /* $OpenBSD: dsa_asn1.c,v 1.15 2015/02/10 05:12:23 jsing Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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13 * notice, this list of conditions and the following disclaimer.
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16 * notice, this list of conditions and the following disclaimer in
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21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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36 * "This product includes software developed by the OpenSSL Project
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51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
62 #include <openssl/asn1.h>
63 #include <openssl/asn1t.h>
64 #include <openssl/dsa.h>
65 #include <openssl/err.h>
67 /* Override the default new methods */
69 sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
71 if (operation == ASN1_OP_NEW_PRE) {
74 sig = malloc(sizeof(DSA_SIG));
76 DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);
81 *pval = (ASN1_VALUE *)sig;
87 static const ASN1_AUX DSA_SIG_aux = {
95 static const ASN1_TEMPLATE DSA_SIG_seq_tt[] = {
99 .offset = offsetof(DSA_SIG, r),
106 .offset = offsetof(DSA_SIG, s),
112 const ASN1_ITEM DSA_SIG_it = {
113 .itype = ASN1_ITYPE_SEQUENCE,
114 .utype = V_ASN1_SEQUENCE,
115 .templates = DSA_SIG_seq_tt,
116 .tcount = sizeof(DSA_SIG_seq_tt) / sizeof(ASN1_TEMPLATE),
117 .funcs = &DSA_SIG_aux,
118 .size = sizeof(DSA_SIG),
124 d2i_DSA_SIG(DSA_SIG **a, const unsigned char **in, long len)
126 return (DSA_SIG *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
131 i2d_DSA_SIG(const DSA_SIG *a, unsigned char **out)
133 return ASN1_item_i2d((ASN1_VALUE *)a, out, &DSA_SIG_it);
136 /* Override the default free and new methods */
138 dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
140 if (operation == ASN1_OP_NEW_PRE) {
141 *pval = (ASN1_VALUE *)DSA_new();
145 } else if (operation == ASN1_OP_FREE_PRE) {
146 DSA_free((DSA *)*pval);
153 static const ASN1_AUX DSAPrivateKey_aux = {
161 static const ASN1_TEMPLATE DSAPrivateKey_seq_tt[] = {
165 .offset = offsetof(DSA, version),
166 .field_name = "version",
172 .offset = offsetof(DSA, p),
179 .offset = offsetof(DSA, q),
186 .offset = offsetof(DSA, g),
193 .offset = offsetof(DSA, pub_key),
194 .field_name = "pub_key",
200 .offset = offsetof(DSA, priv_key),
201 .field_name = "priv_key",
206 const ASN1_ITEM DSAPrivateKey_it = {
207 .itype = ASN1_ITYPE_SEQUENCE,
208 .utype = V_ASN1_SEQUENCE,
209 .templates = DSAPrivateKey_seq_tt,
210 .tcount = sizeof(DSAPrivateKey_seq_tt) / sizeof(ASN1_TEMPLATE),
211 .funcs = &DSAPrivateKey_aux,
218 d2i_DSAPrivateKey(DSA **a, const unsigned char **in, long len)
220 return (DSA *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
225 i2d_DSAPrivateKey(const DSA *a, unsigned char **out)
227 return ASN1_item_i2d((ASN1_VALUE *)a, out, &DSAPrivateKey_it);
230 static const ASN1_AUX DSAparams_aux = {
238 static const ASN1_TEMPLATE DSAparams_seq_tt[] = {
242 .offset = offsetof(DSA, p),
249 .offset = offsetof(DSA, q),
256 .offset = offsetof(DSA, g),
262 const ASN1_ITEM DSAparams_it = {
263 .itype = ASN1_ITYPE_SEQUENCE,
264 .utype = V_ASN1_SEQUENCE,
265 .templates = DSAparams_seq_tt,
266 .tcount = sizeof(DSAparams_seq_tt) / sizeof(ASN1_TEMPLATE),
267 .funcs = &DSAparams_aux,
274 d2i_DSAparams(DSA **a, const unsigned char **in, long len)
276 return (DSA *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
281 i2d_DSAparams(const DSA *a, unsigned char **out)
283 return ASN1_item_i2d((ASN1_VALUE *)a, out, &DSAparams_it);
287 * DSA public key is a bit trickier... its effectively a CHOICE type
288 * decided by a field called write_params which can either write out
289 * just the public key as an INTEGER or the parameters and public key
293 static const ASN1_TEMPLATE dsa_pub_internal_seq_tt[] = {
297 .offset = offsetof(DSA, pub_key),
298 .field_name = "pub_key",
304 .offset = offsetof(DSA, p),
311 .offset = offsetof(DSA, q),
318 .offset = offsetof(DSA, g),
324 const ASN1_ITEM dsa_pub_internal_it = {
325 .itype = ASN1_ITYPE_SEQUENCE,
326 .utype = V_ASN1_SEQUENCE,
327 .templates = dsa_pub_internal_seq_tt,
328 .tcount = sizeof(dsa_pub_internal_seq_tt) / sizeof(ASN1_TEMPLATE),
334 static const ASN1_AUX DSAPublicKey_aux = {
342 static const ASN1_TEMPLATE DSAPublicKey_ch_tt[] = {
346 .offset = offsetof(DSA, pub_key),
347 .field_name = "pub_key",
351 .flags = 0 | ASN1_TFLG_COMBINE,
355 .item = &dsa_pub_internal_it,
359 const ASN1_ITEM DSAPublicKey_it = {
360 .itype = ASN1_ITYPE_CHOICE,
361 .utype = offsetof(DSA, write_params),
362 .templates = DSAPublicKey_ch_tt,
363 .tcount = sizeof(DSAPublicKey_ch_tt) / sizeof(ASN1_TEMPLATE),
364 .funcs = &DSAPublicKey_aux,
371 d2i_DSAPublicKey(DSA **a, const unsigned char **in, long len)
373 return (DSA *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
378 i2d_DSAPublicKey(const DSA *a, unsigned char **out)
380 return ASN1_item_i2d((ASN1_VALUE *)a, out, &DSAPublicKey_it);
384 DSAparams_dup(DSA *dsa)
386 return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
390 DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig,
391 unsigned int *siglen, DSA *dsa)
395 s = DSA_do_sign(dgst, dlen, dsa);
400 *siglen = i2d_DSA_SIG(s,&sig);
406 * data has already been hashed (probably with SHA or SHA-1).
408 * 1: correct signature
409 * 0: incorrect signature
413 DSA_verify(int type, const unsigned char *dgst, int dgst_len,
414 const unsigned char *sigbuf, int siglen, DSA *dsa)
417 unsigned char *der = NULL;
418 const unsigned char *p = sigbuf;
425 if (d2i_DSA_SIG(&s, &p, siglen) == NULL)
427 /* Ensure signature uses DER and doesn't have trailing garbage */
428 derlen = i2d_DSA_SIG(s, &der);
429 if (derlen != siglen || memcmp(sigbuf, der, derlen))
431 ret = DSA_do_verify(dgst, dgst_len, s, dsa);
434 explicit_bzero(der, derlen);