/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2006.
*/
/* ====================================================================
* Copyright (c) 2006 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 "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/evp.h>
#include <openssl/bn.h>
#include "evp_locl.h"
#include "dsa_locl.h"
/* DSA pkey context structure */
typedef struct
{
/* Parameter gen parameters */
int nbits; /* size of p in bits (default: 1024) */
int qbits; /* size of q in bits (default: 160) */
const EVP_MD *pmd; /* MD for parameter generation */
/* Keygen callback info */
int gentmp[2];
/* message digest */
const EVP_MD *md; /* MD for the signature */
} DSA_PKEY_CTX;
static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
{
DSA_PKEY_CTX *dctx;
dctx = OPENSSL_malloc(sizeof(DSA_PKEY_CTX));
if (!dctx)
return 0;
dctx->nbits = 1024;
dctx->qbits = 160;
dctx->pmd = NULL;
dctx->md = NULL;
ctx->data = dctx;
ctx->keygen_info = dctx->gentmp;
ctx->keygen_info_count = 2;
return 1;
}
static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
DSA_PKEY_CTX *dctx, *sctx;
if (!pkey_dsa_init(dst))
return 0;
sctx = src->data;
dctx = dst->data;
dctx->nbits = sctx->nbits;
dctx->qbits = sctx->qbits;
dctx->pmd = sctx->pmd;
dctx->md = sctx->md;
return 1;
}
static void pkey_dsa_cleanup(EVP_PKEY_CTX *ctx)
{
DSA_PKEY_CTX *dctx = ctx->data;
if (dctx)
OPENSSL_free(dctx);
}
static int pkey_dsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
const unsigned char *tbs, size_t tbslen)
{
int ret, type;
unsigned int sltmp;
DSA_PKEY_CTX *dctx = ctx->data;
DSA *dsa = ctx->pkey->pkey.dsa;
if (dctx->md)
type = EVP_MD_type(dctx->md);
else
type = NID_sha1;
ret = DSA_sign(type, tbs, tbslen, sig, &sltmp, dsa);
if (ret <= 0)
return ret;
*siglen = sltmp;
return 1;
}
static int pkey_dsa_verify(EVP_PKEY_CTX *ctx,
const unsigned char *sig, size_t siglen,
const unsigned char *tbs, size_t tbslen)
{
int ret, type;
DSA_PKEY_CTX *dctx = ctx->data;
DSA *dsa = ctx->pkey->pkey.dsa;
if (dctx->md)
type = EVP_MD_type(dctx->md);
else
type = NID_sha1;
ret = DSA_verify(type, tbs, tbslen, sig, siglen, dsa);
return ret;
}
static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
DSA_PKEY_CTX *dctx = ctx->data;
switch (type)
{
case EVP_PKEY_CTRL_DSA_PARAMGEN_BITS:
if (p1 < 256)
return -2;
dctx->nbits = p1;
return 1;
case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
return -2;
dctx->qbits = p1;
return 1;
case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha256)
{
DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
return 0;
}
dctx->md = p2;
return 1;
case EVP_PKEY_CTRL_MD:
if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
EVP_MD_type((const EVP_MD *)p2) != NID_dsa &&
EVP_MD_type((const EVP_MD *)p2) != NID_dsaWithSHA &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
{
DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
return 0;
}
dctx->md = p2;
return 1;
case EVP_PKEY_CTRL_DIGESTINIT:
case EVP_PKEY_CTRL_PKCS7_SIGN:
case EVP_PKEY_CTRL_CMS_SIGN:
return 1;
case EVP_PKEY_CTRL_PEER_KEY:
DSAerr(DSA_F_PKEY_DSA_CTRL,
EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return -2;
default:
return -2;
}
}
static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (!strcmp(type, "dsa_paramgen_bits"))
{
int nbits;
nbits = atoi(value);
return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
}
if (!strcmp(type, "dsa_paramgen_q_bits"))
{
int qbits = atoi(value);
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL);
}
if (!strcmp(type, "dsa_paramgen_md"))
{
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
(void *)EVP_get_digestbyname(value));
}
return -2;
}
static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
DSA *dsa = NULL;
DSA_PKEY_CTX *dctx = ctx->data;
BN_GENCB *pcb, cb;
int ret;
if (ctx->pkey_gencb)
{
pcb = &cb;
evp_pkey_set_cb_translate(pcb, ctx);
}
else
pcb = NULL;
dsa = DSA_new();
if (!dsa)
return 0;
ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
NULL, 0, NULL, NULL, NULL, pcb);
if (ret)
EVP_PKEY_assign_DSA(pkey, dsa);
else
DSA_free(dsa);
return ret;
}
static int pkey_dsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
DSA *dsa = NULL;
if (ctx->pkey == NULL)
{
DSAerr(DSA_F_PKEY_DSA_KEYGEN, DSA_R_NO_PARAMETERS_SET);
return 0;
}
dsa = DSA_new();
if (!dsa)
return 0;
EVP_PKEY_assign_DSA(pkey, dsa);
/* Note: if error return, pkey is freed by parent routine */
if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
return 0;
return DSA_generate_key(pkey->pkey.dsa);
}
const EVP_PKEY_METHOD dsa_pkey_meth =
{
EVP_PKEY_DSA,
EVP_PKEY_FLAG_AUTOARGLEN,
pkey_dsa_init,
pkey_dsa_copy,
pkey_dsa_cleanup,
0,
pkey_dsa_paramgen,
0,
pkey_dsa_keygen,
0,
pkey_dsa_sign,
0,
pkey_dsa_verify,
0,0,
0,0,0,0,
0,0,
0,0,
0,0,
pkey_dsa_ctrl,
pkey_dsa_ctrl_str
};