yuzu/externals/libressl/crypto/dsa/dsa_asn1.c

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2020-12-28 19:15:37 +04:00
/* $OpenBSD: dsa_asn1.c,v 1.22 2018/06/14 17:03:19 jsing Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2000.
*/
/* ====================================================================
* Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* 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
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/dsa.h>
#include <openssl/err.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;
if ((sig = DSA_SIG_new()) == NULL) {
DSAerror(ERR_R_MALLOC_FAILURE);
return 0;
}
*pval = (ASN1_VALUE *)sig;
return 2;
}
return 1;
}
static const ASN1_AUX DSA_SIG_aux = {
.app_data = NULL,
.flags = 0,
.ref_offset = 0,
.ref_lock = 0,
.asn1_cb = sig_cb,
.enc_offset = 0,
};
static const ASN1_TEMPLATE DSA_SIG_seq_tt[] = {
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA_SIG, r),
.field_name = "r",
.item = &CBIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA_SIG, s),
.field_name = "s",
.item = &CBIGNUM_it,
},
};
const ASN1_ITEM DSA_SIG_it = {
.itype = ASN1_ITYPE_SEQUENCE,
.utype = V_ASN1_SEQUENCE,
.templates = DSA_SIG_seq_tt,
.tcount = sizeof(DSA_SIG_seq_tt) / sizeof(ASN1_TEMPLATE),
.funcs = &DSA_SIG_aux,
.size = sizeof(DSA_SIG),
.sname = "DSA_SIG",
};
DSA_SIG *
d2i_DSA_SIG(DSA_SIG **a, const unsigned char **in, long len)
{
return (DSA_SIG *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
&DSA_SIG_it);
}
int
i2d_DSA_SIG(const DSA_SIG *a, unsigned char **out)
{
return ASN1_item_i2d((ASN1_VALUE *)a, out, &DSA_SIG_it);
}
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);
sig->r = r;
BN_clear_free(sig->s);
sig->s = s;
return 1;
}
/* Override the default free and new methods */
static int
dsa_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 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;
}
static const ASN1_AUX DSAPrivateKey_aux = {
.app_data = NULL,
.flags = 0,
.ref_offset = 0,
.ref_lock = 0,
.asn1_cb = dsa_cb,
.enc_offset = 0,
};
static const ASN1_TEMPLATE DSAPrivateKey_seq_tt[] = {
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, version),
.field_name = "version",
.item = &LONG_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, p),
.field_name = "p",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, q),
.field_name = "q",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, g),
.field_name = "g",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, pub_key),
.field_name = "pub_key",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, priv_key),
.field_name = "priv_key",
.item = &BIGNUM_it,
},
};
const ASN1_ITEM DSAPrivateKey_it = {
.itype = ASN1_ITYPE_SEQUENCE,
.utype = V_ASN1_SEQUENCE,
.templates = DSAPrivateKey_seq_tt,
.tcount = sizeof(DSAPrivateKey_seq_tt) / sizeof(ASN1_TEMPLATE),
.funcs = &DSAPrivateKey_aux,
.size = sizeof(DSA),
.sname = "DSA",
};
DSA *
d2i_DSAPrivateKey(DSA **a, const unsigned char **in, long len)
{
return (DSA *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
&DSAPrivateKey_it);
}
int
i2d_DSAPrivateKey(const DSA *a, unsigned char **out)
{
return ASN1_item_i2d((ASN1_VALUE *)a, out, &DSAPrivateKey_it);
}
static const ASN1_AUX DSAparams_aux = {
.app_data = NULL,
.flags = 0,
.ref_offset = 0,
.ref_lock = 0,
.asn1_cb = dsa_cb,
.enc_offset = 0,
};
static const ASN1_TEMPLATE DSAparams_seq_tt[] = {
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, p),
.field_name = "p",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, q),
.field_name = "q",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, g),
.field_name = "g",
.item = &BIGNUM_it,
},
};
const ASN1_ITEM DSAparams_it = {
.itype = ASN1_ITYPE_SEQUENCE,
.utype = V_ASN1_SEQUENCE,
.templates = DSAparams_seq_tt,
.tcount = sizeof(DSAparams_seq_tt) / sizeof(ASN1_TEMPLATE),
.funcs = &DSAparams_aux,
.size = sizeof(DSA),
.sname = "DSA",
};
DSA *
d2i_DSAparams(DSA **a, const unsigned char **in, long len)
{
return (DSA *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
&DSAparams_it);
}
int
i2d_DSAparams(const DSA *a, unsigned char **out)
{
return ASN1_item_i2d((ASN1_VALUE *)a, out, &DSAparams_it);
}
DSA *
d2i_DSAparams_bio(BIO *bp, DSA **a)
{
return ASN1_item_d2i_bio(&DSAparams_it, bp, a);
}
int
i2d_DSAparams_bio(BIO *bp, DSA *a)
{
return ASN1_item_i2d_bio(&DSAparams_it, bp, a);
}
DSA *
d2i_DSAparams_fp(FILE *fp, DSA **a)
{
return ASN1_item_d2i_fp(&DSAparams_it, fp, a);
}
int
i2d_DSAparams_fp(FILE *fp, DSA *a)
{
return ASN1_item_i2d_fp(&DSAparams_it, fp, a);
}
/*
* 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
*/
static const ASN1_TEMPLATE dsa_pub_internal_seq_tt[] = {
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, pub_key),
.field_name = "pub_key",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, p),
.field_name = "p",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, q),
.field_name = "q",
.item = &BIGNUM_it,
},
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, g),
.field_name = "g",
.item = &BIGNUM_it,
},
};
const ASN1_ITEM dsa_pub_internal_it = {
.itype = ASN1_ITYPE_SEQUENCE,
.utype = V_ASN1_SEQUENCE,
.templates = dsa_pub_internal_seq_tt,
.tcount = sizeof(dsa_pub_internal_seq_tt) / sizeof(ASN1_TEMPLATE),
.funcs = NULL,
.size = sizeof(DSA),
.sname = "DSA",
};
static const ASN1_AUX DSAPublicKey_aux = {
.app_data = NULL,
.flags = 0,
.ref_offset = 0,
.ref_lock = 0,
.asn1_cb = dsa_cb,
.enc_offset = 0,
};
static const ASN1_TEMPLATE DSAPublicKey_ch_tt[] = {
{
.flags = 0,
.tag = 0,
.offset = offsetof(DSA, pub_key),
.field_name = "pub_key",
.item = &BIGNUM_it,
},
{
.flags = 0 | ASN1_TFLG_COMBINE,
.tag = 0,
.offset = 0,
.field_name = NULL,
.item = &dsa_pub_internal_it,
},
};
const ASN1_ITEM DSAPublicKey_it = {
.itype = ASN1_ITYPE_CHOICE,
.utype = offsetof(DSA, write_params),
.templates = DSAPublicKey_ch_tt,
.tcount = sizeof(DSAPublicKey_ch_tt) / sizeof(ASN1_TEMPLATE),
.funcs = &DSAPublicKey_aux,
.size = sizeof(DSA),
.sname = "DSA",
};
DSA *
d2i_DSAPublicKey(DSA **a, const unsigned char **in, long len)
{
return (DSA *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
&DSAPublicKey_it);
}
int
i2d_DSAPublicKey(const DSA *a, unsigned char **out)
{
return ASN1_item_i2d((ASN1_VALUE *)a, out, &DSAPublicKey_it);
}
DSA *
DSAparams_dup(DSA *dsa)
{
return ASN1_item_dup(&DSAparams_it, dsa);
}
int
DSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char *sig,
unsigned int *siglen, DSA *dsa)
{
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;
unsigned char *der = NULL;
const unsigned char *p = sigbuf;
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:
freezero(der, derlen);
DSA_SIG_free(s);
return ret;
}