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231 lines
7.4 KiB
C
231 lines
7.4 KiB
C
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2006.
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*/
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/* ====================================================================
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* Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include "internal.h"
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#include "../fipsmodule/digest/internal.h"
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enum evp_sign_verify_t {
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evp_sign,
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evp_verify,
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};
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static const struct evp_md_pctx_ops md_pctx_ops = {
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EVP_PKEY_CTX_free,
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EVP_PKEY_CTX_dup,
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};
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static int uses_prehash(EVP_MD_CTX *ctx, enum evp_sign_verify_t op) {
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return (op == evp_sign) ? (ctx->pctx->pmeth->sign != NULL)
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: (ctx->pctx->pmeth->verify != NULL);
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}
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static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey,
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enum evp_sign_verify_t op) {
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if (ctx->pctx == NULL) {
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ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
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}
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if (ctx->pctx == NULL) {
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return 0;
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}
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ctx->pctx_ops = &md_pctx_ops;
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if (op == evp_verify) {
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if (!EVP_PKEY_verify_init(ctx->pctx)) {
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return 0;
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}
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} else {
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if (!EVP_PKEY_sign_init(ctx->pctx)) {
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return 0;
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}
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}
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if (type != NULL &&
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!EVP_PKEY_CTX_set_signature_md(ctx->pctx, type)) {
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return 0;
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}
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if (uses_prehash(ctx, op)) {
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if (type == NULL) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_NO_DEFAULT_DIGEST);
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return 0;
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}
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if (!EVP_DigestInit_ex(ctx, type, e)) {
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return 0;
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}
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}
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if (pctx) {
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*pctx = ctx->pctx;
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}
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return 1;
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}
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int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type,
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ENGINE *e, EVP_PKEY *pkey) {
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return do_sigver_init(ctx, pctx, type, e, pkey, evp_sign);
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}
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int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
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const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) {
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return do_sigver_init(ctx, pctx, type, e, pkey, evp_verify);
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}
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int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
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if (!uses_prehash(ctx, evp_sign)) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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return 0;
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}
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return EVP_DigestUpdate(ctx, data, len);
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}
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int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
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if (!uses_prehash(ctx, evp_verify)) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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return 0;
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}
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return EVP_DigestUpdate(ctx, data, len);
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}
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int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig,
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size_t *out_sig_len) {
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if (!uses_prehash(ctx, evp_sign)) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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return 0;
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}
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if (out_sig) {
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EVP_MD_CTX tmp_ctx;
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int ret;
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uint8_t md[EVP_MAX_MD_SIZE];
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unsigned int mdlen;
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EVP_MD_CTX_init(&tmp_ctx);
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ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) &&
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EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) &&
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EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen);
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EVP_MD_CTX_cleanup(&tmp_ctx);
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return ret;
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} else {
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size_t s = EVP_MD_size(ctx->digest);
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return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s);
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}
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}
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int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
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size_t sig_len) {
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if (!uses_prehash(ctx, evp_verify)) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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return 0;
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}
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EVP_MD_CTX tmp_ctx;
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int ret;
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uint8_t md[EVP_MAX_MD_SIZE];
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unsigned int mdlen;
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EVP_MD_CTX_init(&tmp_ctx);
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ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) &&
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EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) &&
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EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen);
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EVP_MD_CTX_cleanup(&tmp_ctx);
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return ret;
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}
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int EVP_DigestSign(EVP_MD_CTX *ctx, uint8_t *out_sig, size_t *out_sig_len,
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const uint8_t *data, size_t data_len) {
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if (uses_prehash(ctx, evp_sign)) {
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// If |out_sig| is NULL, the caller is only querying the maximum output
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// length. |data| should only be incorporated in the final call.
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if (out_sig != NULL &&
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!EVP_DigestSignUpdate(ctx, data, data_len)) {
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return 0;
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}
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return EVP_DigestSignFinal(ctx, out_sig, out_sig_len);
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}
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if (ctx->pctx->pmeth->sign_message == NULL) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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return 0;
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}
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return ctx->pctx->pmeth->sign_message(ctx->pctx, out_sig, out_sig_len, data,
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data_len);
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}
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int EVP_DigestVerify(EVP_MD_CTX *ctx, const uint8_t *sig, size_t sig_len,
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const uint8_t *data, size_t len) {
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if (uses_prehash(ctx, evp_verify)) {
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return EVP_DigestVerifyUpdate(ctx, data, len) &&
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EVP_DigestVerifyFinal(ctx, sig, sig_len);
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}
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if (ctx->pctx->pmeth->verify_message == NULL) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
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return 0;
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}
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return ctx->pctx->pmeth->verify_message(ctx->pctx, sig, sig_len, data, len);
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}
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