-/* dsa_asn1.c */
-/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
- * project 2000.
+/*
+ * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
+ * 2000.
*/
/* ====================================================================
* Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
*/
#include <stdio.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
#include <openssl/dsa.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
+#include <openssl/rand.h>
+#include "dsa_locl.h"
-/* Override the default new methods */
-static int sig_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
- void *exarg)
-{
- if(operation == ASN1_OP_NEW_PRE) {
- DSA_SIG *sig;
- sig = OPENSSL_malloc(sizeof(DSA_SIG));
- if (!sig)
- {
- DSAerr(DSA_F_SIG_CB, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- sig->r = NULL;
- sig->s = NULL;
- *pval = (ASN1_VALUE *)sig;
- return 2;
- }
- return 1;
-}
-
-ASN1_SEQUENCE_cb(DSA_SIG, sig_cb) = {
- ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
- ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
-} ASN1_SEQUENCE_END_cb(DSA_SIG, DSA_SIG)
+ASN1_SEQUENCE(DSA_SIG) = {
+ ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
+ ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
+} static_ASN1_SEQUENCE_END(DSA_SIG)
IMPLEMENT_ASN1_FUNCTIONS_const(DSA_SIG)
+void DSA_SIG_get0(BIGNUM **pr, BIGNUM **ps, DSA_SIG *sig)
+{
+ *pr = sig->r;
+ *ps = sig->s;
+}
+
/* Override the default free and new methods */
static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
- void *exarg)
+ void *exarg)
{
- if(operation == ASN1_OP_NEW_PRE) {
- *pval = (ASN1_VALUE *)DSA_new();
- if(*pval) return 2;
- return 0;
- } else if(operation == ASN1_OP_FREE_PRE) {
- DSA_free((DSA *)*pval);
- *pval = NULL;
- return 2;
- }
- return 1;
+ if (operation == ASN1_OP_NEW_PRE) {
+ *pval = (ASN1_VALUE *)DSA_new();
+ if (*pval != NULL)
+ return 2;
+ return 0;
+ } else if (operation == ASN1_OP_FREE_PRE) {
+ DSA_free((DSA *)*pval);
+ *pval = NULL;
+ return 2;
+ }
+ return 1;
}
ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = {
- ASN1_SIMPLE(DSA, version, LONG),
- ASN1_SIMPLE(DSA, p, BIGNUM),
- ASN1_SIMPLE(DSA, q, BIGNUM),
- ASN1_SIMPLE(DSA, g, BIGNUM),
- ASN1_SIMPLE(DSA, pub_key, BIGNUM),
- ASN1_SIMPLE(DSA, priv_key, BIGNUM)
-} ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)
+ ASN1_SIMPLE(DSA, version, LONG),
+ ASN1_SIMPLE(DSA, p, BIGNUM),
+ ASN1_SIMPLE(DSA, q, BIGNUM),
+ ASN1_SIMPLE(DSA, g, BIGNUM),
+ ASN1_SIMPLE(DSA, pub_key, BIGNUM),
+ ASN1_SIMPLE(DSA, priv_key, CBIGNUM)
+} static_ASN1_SEQUENCE_END_cb(DSA, DSAPrivateKey)
IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPrivateKey, DSAPrivateKey)
ASN1_SEQUENCE_cb(DSAparams, dsa_cb) = {
- ASN1_SIMPLE(DSA, p, BIGNUM),
- ASN1_SIMPLE(DSA, q, BIGNUM),
- ASN1_SIMPLE(DSA, g, BIGNUM),
-} ASN1_SEQUENCE_END_cb(DSA, DSAparams)
+ ASN1_SIMPLE(DSA, p, BIGNUM),
+ ASN1_SIMPLE(DSA, q, BIGNUM),
+ ASN1_SIMPLE(DSA, g, BIGNUM),
+} static_ASN1_SEQUENCE_END_cb(DSA, DSAparams)
IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAparams, DSAparams)
-/* DSA public key is a bit trickier... its effectively a CHOICE type
- * decided by a field called write_params which can either write out
- * just the public key as an INTEGER or the parameters and public key
- * in a SEQUENCE
- */
+ASN1_SEQUENCE_cb(DSAPublicKey, dsa_cb) = {
+ ASN1_SIMPLE(DSA, pub_key, BIGNUM),
+ ASN1_SIMPLE(DSA, p, BIGNUM),
+ ASN1_SIMPLE(DSA, q, BIGNUM),
+ ASN1_SIMPLE(DSA, g, BIGNUM)
+} static_ASN1_SEQUENCE_END_cb(DSA, DSAPublicKey)
+
+IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
-ASN1_SEQUENCE(dsa_pub_internal) = {
- ASN1_SIMPLE(DSA, pub_key, BIGNUM),
- ASN1_SIMPLE(DSA, p, BIGNUM),
- ASN1_SIMPLE(DSA, q, BIGNUM),
- ASN1_SIMPLE(DSA, g, BIGNUM)
-} ASN1_SEQUENCE_END_name(DSA, dsa_pub_internal)
+DSA *DSAparams_dup(DSA *dsa)
+{
+ return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
+}
-ASN1_CHOICE_cb(DSAPublicKey, dsa_cb) = {
- ASN1_SIMPLE(DSA, pub_key, BIGNUM),
- ASN1_EX_COMBINE(0, 0, dsa_pub_internal)
-} ASN1_CHOICE_END_cb(DSA, DSAPublicKey, write_params)
+int DSA_sign(int type, const unsigned char *dgst, int dlen,
+ unsigned char *sig, unsigned int *siglen, DSA *dsa)
+{
+ DSA_SIG *s;
+ RAND_seed(dgst, dlen);
+ s = DSA_do_sign(dgst, dlen, dsa);
+ if (s == NULL) {
+ *siglen = 0;
+ return (0);
+ }
+ *siglen = i2d_DSA_SIG(s, &sig);
+ DSA_SIG_free(s);
+ return (1);
+}
-IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DSA, DSAPublicKey, DSAPublicKey)
+/* data has already been hashed (probably with SHA or SHA-1). */
+/*-
+ * returns
+ * 1: correct signature
+ * 0: incorrect signature
+ * -1: error
+ */
+int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
+ const unsigned char *sigbuf, int siglen, DSA *dsa)
+{
+ DSA_SIG *s;
+ const unsigned char *p = sigbuf;
+ unsigned char *der = NULL;
+ int derlen = -1;
+ int ret = -1;
+
+ s = DSA_SIG_new();
+ if (s == NULL)
+ return (ret);
+ if (d2i_DSA_SIG(&s, &p, siglen) == NULL)
+ goto err;
+ /* Ensure signature uses DER and doesn't have trailing garbage */
+ derlen = i2d_DSA_SIG(s, &der);
+ if (derlen != siglen || memcmp(sigbuf, der, derlen))
+ goto err;
+ ret = DSA_do_verify(dgst, dgst_len, s, dsa);
+ err:
+ OPENSSL_clear_free(der, derlen);
+ DSA_SIG_free(s);
+ return (ret);
+}
projects / openssl.git / blobdiff