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/*
* Copyright 2019 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 <openssl/crypto.h>
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/dsa.h>
#include <openssl/params.h>
#include "internal/provider_algs.h"
static OSSL_OP_signature_newctx_fn dsa_newctx;
static OSSL_OP_signature_sign_init_fn dsa_sign_init;
static OSSL_OP_signature_sign_fn dsa_sign;
static OSSL_OP_signature_freectx_fn dsa_freectx;
static OSSL_OP_signature_dupctx_fn dsa_dupctx;
static OSSL_OP_signature_set_params_fn dsa_set_params;
/*
* What's passed as an actual key is defined by the KEYMGMT interface.
* We happen to know that our KEYMGMT simply passes DSA structures, so
* we use that here too.
*/
typedef struct {
DSA *dsa;
size_t mdsize;
} PROV_DSA_CTX;
static void *dsa_newctx(void *provctx)
{
return OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
}
static int dsa_sign_init(void *vpdsactx, void *vdsa)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
if (pdsactx == NULL || vdsa == NULL || !DSA_up_ref(vdsa))
return 0;
DSA_free(pdsactx->dsa);
pdsactx->dsa = vdsa;
return 1;
}
static int dsa_sign(void *vpdsactx, unsigned char *sig, size_t *siglen,
size_t sigsize, const unsigned char *tbs, size_t tbslen)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
int ret;
unsigned int sltmp;
size_t dsasize = DSA_size(pdsactx->dsa);
if (sig == NULL) {
*siglen = dsasize;
return 1;
}
if (sigsize < (size_t)dsasize)
return 0;
if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
return 0;
ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, pdsactx-> dsa);
if (ret <= 0)
return 0;
*siglen = sltmp;
return 1;
}
static void dsa_freectx(void *vpdsactx)
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
DSA_free(pdsactx->dsa);
OPENSSL_free(pdsactx);
}
static void *dsa_dupctx(void *vpdsactx)
{
PROV_DSA_CTX *srcctx = (PROV_DSA_CTX *)vpdsactx;
PROV_DSA_CTX *dstctx;
dstctx = OPENSSL_zalloc(sizeof(*srcctx));
if (dstctx == NULL)
return NULL;
*dstctx = *srcctx;
if (dstctx->dsa != NULL && !DSA_up_ref(dstctx->dsa)) {
OPENSSL_free(dstctx);
return NULL;
}
return dstctx;
}
static int dsa_set_params(void *vpdsactx, const OSSL_PARAM params[])
{
PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
const OSSL_PARAM *p;
size_t mdsize;
if (pdsactx == NULL || params == NULL)
return 0;
p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
if (p == NULL || !OSSL_PARAM_get_size_t(p, &mdsize))
return 0;
pdsactx->mdsize = mdsize;
return 1;
}
const OSSL_DISPATCH dsa_signature_functions[] = {
{ OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
{ OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_sign_init },
{ OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
{ OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
{ OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
{ OSSL_FUNC_SIGNATURE_SET_PARAMS, (void (*)(void))dsa_set_params },
{ 0, NULL }
};
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