blob: 08968ed266442e9190ee58459d0f48ae872a5d4e [file] [log] [blame]
/* 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 <openssl/evp.h>
#include <openssl/digest.h>
#include <openssl/err.h>
#include "internal.h"
#include "../digest/internal.h"
/* md_begin_digset is a callback from the |EVP_MD_CTX| code that is called when
* a new digest is begun. */
static int md_begin_digest(EVP_MD_CTX *ctx) {
int r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG,
EVP_PKEY_CTRL_DIGESTINIT, 0, ctx);
return r > 0 || r == -2;
}
static const struct evp_md_pctx_ops md_pctx_ops = {
EVP_PKEY_CTX_free,
EVP_PKEY_CTX_dup,
md_begin_digest,
};
static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
int is_verify) {
if (ctx->pctx == NULL) {
ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
}
if (ctx->pctx == NULL) {
return 0;
}
ctx->pctx_ops = &md_pctx_ops;
if (type == NULL) {
type = EVP_sha1();
}
if (type == NULL) {
OPENSSL_PUT_ERROR(EVP, do_sigver_init, EVP_R_NO_DEFAULT_DIGEST);
return 0;
}
if (is_verify) {
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_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
return EVP_DigestUpdate(ctx, data, len);
}
int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
return EVP_DigestUpdate(ctx, data, len);
}
int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig,
size_t *out_sig_len) {
int r = 0;
const int has_signctx = ctx->pctx->pmeth->signctx != NULL;
if (out_sig) {
EVP_MD_CTX tmp_ctx;
uint8_t 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 (has_signctx) {
r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, out_sig, out_sig_len, &tmp_ctx);
} else {
r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
}
EVP_MD_CTX_cleanup(&tmp_ctx);
if (has_signctx || !r) {
return r;
}
if (EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen) <= 0) {
return 0;
}
} else {
if (has_signctx) {
if (ctx->pctx->pmeth->signctx(ctx->pctx, out_sig, out_sig_len, ctx) <= 0) {
return 0;
}
} else {
size_t s = EVP_MD_size(ctx->digest);
if (EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s) <= 0) {
return 0;
}
}
}
return 1;
}
int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
size_t sig_len) {
EVP_MD_CTX tmp_ctx;
uint8_t md[EVP_MAX_MD_SIZE];
int r;
unsigned int mdlen;
const int has_verifyctx = ctx->pctx->pmeth->verifyctx != NULL;
EVP_MD_CTX_init(&tmp_ctx);
if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) {
return -1;
}
if (has_verifyctx) {
r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, sig, sig_len, &tmp_ctx);
} else {
r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
}
EVP_MD_CTX_cleanup(&tmp_ctx);
if (has_verifyctx || !r) {
return r;
}
return EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen);
}