A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <time.h>
#include <sys/types.h>
#include "internal/cryptlib.h"
#include <openssl/bn.h>
#include <openssl/x509.h>
#include <openssl/objects.h>
#include <openssl/buffer.h>
#include <openssl/evp.h>
#include "crypto/asn1.h"
#include "crypto/evp.h"
#ifndef OPENSSL_NO_DEPRECATED_3_0
int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
char *data, EVP_PKEY *pkey)
{
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
const EVP_MD *type;
unsigned char *p, *buf_in = NULL;
int ret = -1, i, inl;
if (ctx == NULL) {
ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
goto err;
}
i = OBJ_obj2nid(a->algorithm);
type = EVP_get_digestbyname(OBJ_nid2sn(i));
if (type == NULL) {
ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
goto err;
}
if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
ASN1err(ASN1_F_ASN1_VERIFY, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
goto err;
}
inl = i2d(data, NULL);
if (inl <= 0) {
ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_INTERNAL_ERROR);
goto err;
}
buf_in = OPENSSL_malloc((unsigned int)inl);
if (buf_in == NULL) {
ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_MALLOC_FAILURE);
goto err;
}
p = buf_in;
i2d(data, &p);
ret = EVP_VerifyInit_ex(ctx, type, NULL)
&& EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl);
OPENSSL_clear_free(buf_in, (unsigned int)inl);
if (!ret) {
ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
goto err;
}
ret = -1;
if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data,
(unsigned int)signature->length, pkey) <= 0) {
ASN1err(ASN1_F_ASN1_VERIFY, ERR_R_EVP_LIB);
ret = 0;
goto err;
}
ret = 1;
err:
EVP_MD_CTX_free(ctx);
return ret;
}
#endif
int ASN1_item_verify(const ASN1_ITEM *it, const X509_ALGOR *alg,
const ASN1_BIT_STRING *signature, const void *data,
EVP_PKEY *pkey)
{
return ASN1_item_verify_ex(it, alg, signature, data, NULL, pkey, NULL, NULL);
}
int ASN1_item_verify_ex(const ASN1_ITEM *it, const X509_ALGOR *alg,
const ASN1_BIT_STRING *signature, const void *data,
const ASN1_OCTET_STRING *id, EVP_PKEY *pkey,
OSSL_LIB_CTX *libctx, const char *propq)
{
EVP_MD_CTX *ctx;
int rv = -1;
if ((ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq)) != NULL) {
rv = ASN1_item_verify_ctx(it, alg, signature, data, ctx);
EVP_PKEY_CTX_free(EVP_MD_CTX_pkey_ctx(ctx));
EVP_MD_CTX_free(ctx);
}
return rv;
}
int ASN1_item_verify_ctx(const ASN1_ITEM *it, const X509_ALGOR *alg,
const ASN1_BIT_STRING *signature, const void *data,
EVP_MD_CTX *ctx)
{
EVP_PKEY *pkey;
unsigned char *buf_in = NULL;
int ret = -1, inl = 0;
int mdnid, pknid;
size_t inll = 0;
pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
if (pkey == NULL) {
ASN1err(0, ERR_R_PASSED_NULL_PARAMETER);
return -1;
}
if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
ASN1err(0, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
return -1;
}
/* Convert signature OID into digest and public key OIDs */
if (!OBJ_find_sigid_algs(OBJ_obj2nid(alg->algorithm), &mdnid, &pknid)) {
ASN1err(0, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
goto err;
}
if (mdnid == NID_undef) {
if (pkey->ameth == NULL || pkey->ameth->item_verify == NULL) {
ASN1err(0, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
goto err;
}
ret = pkey->ameth->item_verify(ctx, it, data, alg, signature, pkey);
/*
* Return values meaning:
* <=0: error.
* 1: method does everything.
* 2: carry on as normal, method has called EVP_DigestVerifyInit()
*/
if (ret <= 0)
ASN1err(0, ERR_R_EVP_LIB);
if (ret <= 1)
goto err;
} else {
const EVP_MD *type = EVP_get_digestbynid(mdnid);
if (type == NULL) {
ASN1err(0, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
goto err;
}
/* Check public key OID matches public key type */
if (!EVP_PKEY_is_a(pkey, OBJ_nid2sn(pknid))) {
ASN1err(0, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
goto err;
}
if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
ASN1err(0, ERR_R_EVP_LIB);
ret = 0;
goto err;
}
}
inl = ASN1_item_i2d(data, &buf_in, it);
if (inl <= 0) {
ASN1err(0, ERR_R_INTERNAL_ERROR);
goto err;
}
if (buf_in == NULL) {
ASN1err(0, ERR_R_MALLOC_FAILURE);
goto err;
}
inll = inl;
ret = EVP_DigestVerify(ctx, signature->data, (size_t)signature->length,
buf_in, inl);
if (ret <= 0) {
ASN1err(0, ERR_R_EVP_LIB);
goto err;
}
ret = 1;
err:
OPENSSL_clear_free(buf_in, inll);
return ret;
}