ref: 4010db3078491baf3cb0d3d4e3a60c0cea114471
dir: /third_party/boringssl/src/crypto/evp/digestsign.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 <openssl/evp.h>
#include <openssl/err.h>
#include "internal.h"
#include "../fipsmodule/digest/internal.h"
enum evp_sign_verify_t {
evp_sign,
evp_verify,
};
static const struct evp_md_pctx_ops md_pctx_ops = {
EVP_PKEY_CTX_free,
EVP_PKEY_CTX_dup,
};
static int uses_prehash(EVP_MD_CTX *ctx, enum evp_sign_verify_t op) {
return (op == evp_sign) ? (ctx->pctx->pmeth->sign != NULL)
: (ctx->pctx->pmeth->verify != NULL);
}
static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
enum evp_sign_verify_t op) {
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 (op == evp_verify) {
if (!EVP_PKEY_verify_init(ctx->pctx)) {
return 0;
}
} else {
if (!EVP_PKEY_sign_init(ctx->pctx)) {
return 0;
}
}
if (type != NULL &&
!EVP_PKEY_CTX_set_signature_md(ctx->pctx, type)) {
return 0;
}
if (uses_prehash(ctx, op)) {
if (type == NULL) {
OPENSSL_PUT_ERROR(EVP, EVP_R_NO_DEFAULT_DIGEST);
return 0;
}
if (!EVP_DigestInit_ex(ctx, type, e)) {
return 0;
}
}
if (pctx) {
*pctx = ctx->pctx;
}
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, evp_sign);
}
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, evp_verify);
}
int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
if (!uses_prehash(ctx, evp_sign)) {
OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return 0;
}
return EVP_DigestUpdate(ctx, data, len);
}
int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
if (!uses_prehash(ctx, evp_verify)) {
OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return 0;
}
return EVP_DigestUpdate(ctx, data, len);
}
int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig,
size_t *out_sig_len) {
if (!uses_prehash(ctx, evp_sign)) {
OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return 0;
}
if (out_sig) {
EVP_MD_CTX tmp_ctx;
int ret;
uint8_t md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
EVP_MD_CTX_init(&tmp_ctx);
ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) &&
EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) &&
EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen);
EVP_MD_CTX_cleanup(&tmp_ctx);
return ret;
} else {
size_t s = EVP_MD_size(ctx->digest);
return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s);
}
}
int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
size_t sig_len) {
if (!uses_prehash(ctx, evp_verify)) {
OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return 0;
}
EVP_MD_CTX tmp_ctx;
int ret;
uint8_t md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
EVP_MD_CTX_init(&tmp_ctx);
ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) &&
EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) &&
EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen);
EVP_MD_CTX_cleanup(&tmp_ctx);
return ret;
}
int EVP_DigestSign(EVP_MD_CTX *ctx, uint8_t *out_sig, size_t *out_sig_len,
const uint8_t *data, size_t data_len) {
if (uses_prehash(ctx, evp_sign)) {
// If |out_sig| is NULL, the caller is only querying the maximum output
// length. |data| should only be incorporated in the final call.
if (out_sig != NULL &&
!EVP_DigestSignUpdate(ctx, data, data_len)) {
return 0;
}
return EVP_DigestSignFinal(ctx, out_sig, out_sig_len);
}
if (ctx->pctx->pmeth->sign_message == NULL) {
OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return 0;
}
return ctx->pctx->pmeth->sign_message(ctx->pctx, out_sig, out_sig_len, data,
data_len);
}
int EVP_DigestVerify(EVP_MD_CTX *ctx, const uint8_t *sig, size_t sig_len,
const uint8_t *data, size_t len) {
if (uses_prehash(ctx, evp_verify)) {
return EVP_DigestVerifyUpdate(ctx, data, len) &&
EVP_DigestVerifyFinal(ctx, sig, sig_len);
}
if (ctx->pctx->pmeth->verify_message == NULL) {
OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
return 0;
}
return ctx->pctx->pmeth->verify_message(ctx->pctx, sig, sig_len, data, len);
}