204 lines
7.0 KiB
C
204 lines
7.0 KiB
C
/* m_sigver.c */
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/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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* 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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*
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/evp.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include "evp_locl.h"
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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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int ver)
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{
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if (ctx->pctx == NULL)
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ctx->pctx = EVP_PKEY_CTX_new(pkey, e);
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if (ctx->pctx == NULL)
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return 0;
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if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) {
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if (type == NULL) {
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int def_nid;
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if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0)
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type = EVP_get_digestbynid(def_nid);
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}
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if (type == NULL) {
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EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST);
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return 0;
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}
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}
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if (ver) {
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if (ctx->pctx->pmeth->verifyctx_init) {
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if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0)
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return 0;
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ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX;
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} else if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
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return 0;
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} else {
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if (ctx->pctx->pmeth->signctx_init) {
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if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0)
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return 0;
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ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX;
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} else if (EVP_PKEY_sign_init(ctx->pctx) <= 0)
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return 0;
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}
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if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0)
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return 0;
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if (pctx)
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*pctx = ctx->pctx;
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if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)
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return 1;
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if (!EVP_DigestInit_ex(ctx, type, e))
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return 0;
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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,
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const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey)
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{
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return do_sigver_init(ctx, pctx, type, e, pkey, 0);
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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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{
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return do_sigver_init(ctx, pctx, type, e, pkey, 1);
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}
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int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
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size_t *siglen)
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{
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int sctx, r = 0;
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EVP_PKEY_CTX *pctx = ctx->pctx;
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if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) {
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EVP_PKEY_CTX *dctx;
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if (!sigret)
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return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
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dctx = EVP_PKEY_CTX_dup(ctx->pctx);
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if (!dctx)
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return 0;
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r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx);
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EVP_PKEY_CTX_free(dctx);
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return r;
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}
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if (pctx->pmeth->signctx)
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sctx = 1;
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else
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sctx = 0;
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if (sigret) {
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EVP_MD_CTX tmp_ctx;
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unsigned char 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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if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
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return 0;
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if (sctx)
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r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx,
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sigret, siglen, &tmp_ctx);
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else
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r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
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EVP_MD_CTX_cleanup(&tmp_ctx);
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if (sctx || !r)
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return r;
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if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0)
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return 0;
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} else {
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if (sctx) {
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if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
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return 0;
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} else {
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int s = EVP_MD_size(ctx->digest);
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if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0)
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return 0;
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}
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}
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return 1;
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}
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int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
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size_t siglen)
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{
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EVP_MD_CTX tmp_ctx;
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unsigned char md[EVP_MAX_MD_SIZE];
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int r;
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unsigned int mdlen;
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int vctx;
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if (ctx->pctx->pmeth->verifyctx)
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vctx = 1;
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else
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vctx = 0;
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EVP_MD_CTX_init(&tmp_ctx);
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if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx))
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return -1;
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if (vctx) {
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r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx,
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sig, siglen, &tmp_ctx);
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} else
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r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen);
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EVP_MD_CTX_cleanup(&tmp_ctx);
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if (vctx || !r)
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return r;
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return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
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}
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