-/* crypto/dsa/dsa_asn1.c */
+/*
+ * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
#include <stdio.h>
-#include "cryptlib.h"
-#include <openssl/dsa.h>
+#include "internal/cryptlib.h"
+#include "dsa_locl.h"
#include <openssl/asn1.h>
-#include <openssl/asn1_mac.h>
+#include <openssl/asn1t.h>
+#include <openssl/rand.h>
+
+ASN1_SEQUENCE(DSA_SIG) = {
+ ASN1_SIMPLE(DSA_SIG, r, CBIGNUM),
+ ASN1_SIMPLE(DSA_SIG, s, CBIGNUM)
+} static_ASN1_SEQUENCE_END(DSA_SIG)
+
+IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(DSA_SIG, DSA_SIG, DSA_SIG)
DSA_SIG *DSA_SIG_new(void)
{
- DSA_SIG *ret;
-
- ret = OPENSSL_malloc(sizeof(DSA_SIG));
- if (ret == NULL)
- {
- DSAerr(DSA_F_DSA_SIG_NEW,ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- ret->r = NULL;
- ret->s = NULL;
- return(ret);
+ DSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
+ if (sig == NULL)
+ DSAerr(DSA_F_DSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
+ return sig;
+}
+
+void DSA_SIG_free(DSA_SIG *sig)
+{
+ if (sig == NULL)
+ return;
+ BN_clear_free(sig->r);
+ BN_clear_free(sig->s);
+ OPENSSL_free(sig);
+}
+
+void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
+{
+ if (pr != NULL)
+ *pr = sig->r;
+ if (ps != NULL)
+ *ps = sig->s;
+}
+
+int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s)
+{
+ if (r == NULL || s == NULL)
+ return 0;
+ BN_clear_free(sig->r);
+ BN_clear_free(sig->s);
+ sig->r = r;
+ sig->s = s;
+ return 1;
}
-void DSA_SIG_free(DSA_SIG *r)
+/* Override the default free and new methods */
+static int dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
+ void *exarg)
{
- if (r == NULL) return;
- if (r->r) BN_clear_free(r->r);
- if (r->s) BN_clear_free(r->s);
- OPENSSL_free(r);
+ 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;
}
-int i2d_DSA_SIG(const DSA_SIG *v, unsigned char **pp)
+ASN1_SEQUENCE_cb(DSAPrivateKey, dsa_cb) = {
+ ASN1_EMBED(DSA, version, INT32),
+ 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_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),
+} static_ASN1_SEQUENCE_END_cb(DSA, DSAparams)
+
+IMPLEMENT_ASN1_ENCODE_FUNCTIONS_fname(DSA, DSAparams, DSAparams)
+
+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_fname(DSA, DSAPublicKey, DSAPublicKey)
+
+DSA *DSAparams_dup(const DSA *dsa)
{
- int t=0,len;
- ASN1_INTEGER rbs,sbs;
- unsigned char *p;
-
- rbs.data=OPENSSL_malloc(BN_num_bits(v->r)/8+1);
- if (rbs.data == NULL)
- {
- DSAerr(DSA_F_I2D_DSA_SIG, ERR_R_MALLOC_FAILURE);
- return(0);
- }
- rbs.type=V_ASN1_INTEGER;
- rbs.length=BN_bn2bin(v->r,rbs.data);
- sbs.data=OPENSSL_malloc(BN_num_bits(v->s)/8+1);
- if (sbs.data == NULL)
- {
- OPENSSL_free(rbs.data);
- DSAerr(DSA_F_I2D_DSA_SIG, ERR_R_MALLOC_FAILURE);
- return(0);
- }
- sbs.type=V_ASN1_INTEGER;
- sbs.length=BN_bn2bin(v->s,sbs.data);
-
- len=i2d_ASN1_INTEGER(&rbs,NULL);
- len+=i2d_ASN1_INTEGER(&sbs,NULL);
-
- if (pp)
- {
- p=*pp;
- ASN1_put_object(&p,1,len,V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL);
- i2d_ASN1_INTEGER(&rbs,&p);
- i2d_ASN1_INTEGER(&sbs,&p);
- }
- t=ASN1_object_size(1,len,V_ASN1_SEQUENCE);
- OPENSSL_free(rbs.data);
- OPENSSL_free(sbs.data);
- return(t);
+ return ASN1_item_dup(ASN1_ITEM_rptr(DSAparams), dsa);
}
-DSA_SIG *d2i_DSA_SIG(DSA_SIG **a, const unsigned char **pp, long length)
+int DSA_sign(int type, const unsigned char *dgst, int dlen,
+ unsigned char *sig, unsigned int *siglen, DSA *dsa)
{
- int i=ERR_R_NESTED_ASN1_ERROR;
- ASN1_INTEGER *bs=NULL;
- M_ASN1_D2I_vars(a,DSA_SIG *,DSA_SIG_new);
-
- M_ASN1_D2I_Init();
- M_ASN1_D2I_start_sequence();
- M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
- if ((ret->r=BN_bin2bn(bs->data,bs->length,ret->r)) == NULL)
- goto err_bn;
- M_ASN1_D2I_get(bs,d2i_ASN1_INTEGER);
- if ((ret->s=BN_bin2bn(bs->data,bs->length,ret->s)) == NULL)
- goto err_bn;
- M_ASN1_BIT_STRING_free(bs);
- bs = NULL;
- M_ASN1_D2I_Finish_2(a);
-
-err_bn:
- i=ERR_R_BN_LIB;
-err:
- DSAerr(DSA_F_D2I_DSA_SIG,i);
- if ((ret != NULL) && ((a == NULL) || (*a != ret))) DSA_SIG_free(ret);
- if (bs != NULL) M_ASN1_BIT_STRING_free(bs);
- return(NULL);
+ DSA_SIG *s;
+
+ 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;
+}
+
+/* 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