Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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/* m_sigver.c */
/*
* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
* 2006.
*/
/* ====================================================================
* Copyright (c) 2006,2007 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/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include "evp_locl.h"
static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
int ver)
{
if (ctx->pctx == NULL)
ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
if (ctx->pctx == NULL)
return 0;
if (type == NULL) {
int def_nid;
if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
type = EVP_get_digestbynid(def_nid);
}
if (type == NULL) {
EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
return 0;
}
if (ver) {
if (ctx->pctx->pmeth->verifyctx_init) {
if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
return 0;
ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
} else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
return 0;
} else {
if (ctx->pctx->pmeth->signctx_init) {
if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
return 0;
ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
} else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
return 0;
}
if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
return 0;
if (pctx)
*pctx = ctx->pctx;
if (!EVP_DigestInit_ex(ctx, type, e))
return 0;
return 1;
}
int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
{
return do_sigver_init(ctx, pctx, type, e, pkey, 0);
}
int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
{
return do_sigver_init(ctx, pctx, type, e, pkey, 1);
}
int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
size_t *siglen)
{
int sctx, r = 0;
if (ctx->pctx->pmeth->signctx)
sctx = 1;
else
sctx = 0;
if (sigret) {
EVP_MD_CTX tmp_ctx;
unsigned char md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
EVP_MD_CTX_init(&tmp_ctx);
if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
return 0;
if (sctx)
r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx,
sigret, siglen, &tmp_ctx);
else
r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
EVP_MD_CTX_cleanup(&tmp_ctx);
if (sctx || !r)
return r;
if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
return 0;
} else {
if (sctx) {
if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx) <=
0)
return 0;
} else {
int s = EVP_MD_size(ctx->digest);
if (s < 0
|| EVP_PKEY_sign(ctx->pctx, sigret, siglen, NULL, s) <= 0)
return 0;
}
}
return 1;
}
int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, unsigned char *sig, size_t siglen)
{
EVP_MD_CTX tmp_ctx;
unsigned char md[EVP_MAX_MD_SIZE];
int r;
unsigned int mdlen;
int vctx;
if (ctx->pctx->pmeth->verifyctx)
vctx = 1;
else
vctx = 0;
EVP_MD_CTX_init(&tmp_ctx);
if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
return -1;
if (vctx) {
r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx,
sig, siglen, &tmp_ctx);
} else
r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
EVP_MD_CTX_cleanup(&tmp_ctx);
if (vctx || !r)
return r;
return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
}