142 lines
4.6 KiB
C
142 lines
4.6 KiB
C
/* m_sigver.c */
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/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
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* project 2006.
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*/
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/* ====================================================================
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* Copyright (c) 2006 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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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, int ver)
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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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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 (ver)
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{
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if (EVP_PKEY_verify_init(ctx->pctx) <= 0)
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return 0;
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}
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else
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{
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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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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, size_t *siglen)
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{
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if (sigret)
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{
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MS_STATIC 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 (!EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen))
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return 0;
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EVP_MD_CTX_cleanup(&tmp_ctx);
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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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}
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else
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{
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if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, NULL,
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EVP_MD_size(ctx->digest)) <= 0)
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return 0;
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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, unsigned char *sig, size_t siglen)
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{
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MS_STATIC 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 -1;
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if (!EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen))
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return -1;
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EVP_MD_CTX_cleanup(&tmp_ctx);
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return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen);
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}
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