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pineappleEA
2020-12-28 15:15:37 +00:00
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commit 78b48028e1
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167
externals/libressl/crypto/asn1/a_verify.c vendored Executable file
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/* $OpenBSD: a_verify.c,v 1.24 2017/05/02 03:59:44 deraadt Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* 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 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 acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS 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 AUTHOR OR 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.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <openssl/bn.h>
#include <openssl/buffer.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include "asn1_locl.h"
int
ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a,
ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey)
{
EVP_MD_CTX ctx;
unsigned char *buf_in = NULL;
int ret = -1, inl;
int mdnid, pknid;
if (!pkey) {
ASN1error(ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7)
{
ASN1error(ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
return -1;
}
EVP_MD_CTX_init(&ctx);
/* Convert signature OID into digest and public key OIDs */
if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) {
ASN1error(ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
goto err;
}
if (mdnid == NID_undef) {
if (!pkey->ameth || !pkey->ameth->item_verify) {
ASN1error(ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
goto err;
}
ret = pkey->ameth->item_verify(&ctx, it, asn, a,
signature, pkey);
/* Return value of 2 means carry on, anything else means we
* exit straight away: either a fatal error of the underlying
* verification routine handles all verification.
*/
if (ret != 2)
goto err;
ret = -1;
} else {
const EVP_MD *type;
type = EVP_get_digestbynid(mdnid);
if (type == NULL) {
ASN1error(ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
goto err;
}
/* Check public key OID matches public key type */
if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) {
ASN1error(ASN1_R_WRONG_PUBLIC_KEY_TYPE);
goto err;
}
if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey)) {
ASN1error(ERR_R_EVP_LIB);
ret = 0;
goto err;
}
}
inl = ASN1_item_i2d(asn, &buf_in, it);
if (buf_in == NULL) {
ASN1error(ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_DigestVerifyUpdate(&ctx, buf_in, inl)) {
ASN1error(ERR_R_EVP_LIB);
ret = 0;
goto err;
}
freezero(buf_in, (unsigned int)inl);
if (EVP_DigestVerifyFinal(&ctx, signature->data,
(size_t)signature->length) <= 0) {
ASN1error(ERR_R_EVP_LIB);
ret = 0;
goto err;
}
/* we don't need to zero the 'ctx' because we just checked
* public information */
/* memset(&ctx,0,sizeof(ctx)); */
ret = 1;
err:
EVP_MD_CTX_cleanup(&ctx);
return (ret);
}