afa23c46d9
Some functions such as EVP_VerifyFinal only finalise a copy of the passed context in case an application wants to digest more data. Doing this when it is not needed is inefficient and many applications don't require it. For compatibility the default is to still finalise a copy unless the flag EVP_MD_CTX_FLAG_FINALISE is set in which case the passed context is finalised an *no* further data can be digested after finalisation.
248 lines
6.8 KiB
C
248 lines
6.8 KiB
C
/* m_sigver.c */
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/* 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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*
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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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{
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if (type == NULL)
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{
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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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{
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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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{
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if (ctx->pctx->pmeth->verifyctx_init)
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{
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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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}
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else 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 (ctx->pctx->pmeth->signctx_init)
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{
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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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}
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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, 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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{
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if (!sigret)
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return pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
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if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
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r = pctx->pmeth->signctx(pctx, sigret, siglen, ctx);
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else
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{
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EVP_PKEY_CTX *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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}
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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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{
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unsigned char md[EVP_MAX_MD_SIZE];
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unsigned int mdlen;
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if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
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{
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if (sctx)
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r = ctx->pctx->pmeth->signctx(ctx->pctx,
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sigret, siglen, ctx);
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else
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r = EVP_DigestFinal_ex(ctx, md, &mdlen);
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}
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else
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{
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EVP_MD_CTX tmp_ctx;
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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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}
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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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}
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else
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{
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if (sctx)
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{
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if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0)
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return 0;
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}
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else
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{
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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, unsigned char *sig, size_t siglen)
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{
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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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if (ctx->flags & EVP_MD_CTX_FLAG_FINALISE)
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{
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if (vctx)
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{
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r = ctx->pctx->pmeth->verifyctx(ctx->pctx,
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sig, siglen, ctx);
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}
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else
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r = EVP_DigestFinal_ex(ctx, md, &mdlen);
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}
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else
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{
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EVP_MD_CTX tmp_ctx;
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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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{
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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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}
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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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}
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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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