224 lines
6.8 KiB
C
224 lines
6.8 KiB
C
/*
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* Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include <time.h>
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#include <sys/types.h>
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#include "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/x509.h>
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#include <openssl/objects.h>
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#include <openssl/buffer.h>
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#include <openssl/evp.h>
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#include "crypto/asn1.h"
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#include "crypto/evp.h"
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#include "crypto/rsa.h"
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#ifndef OPENSSL_NO_DEPRECATED_3_0
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int ASN1_verify(i2d_of_void *i2d, X509_ALGOR *a, ASN1_BIT_STRING *signature,
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char *data, EVP_PKEY *pkey)
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{
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EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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const EVP_MD *type;
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unsigned char *p, *buf_in = NULL;
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int ret = -1, i, inl;
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if (ctx == NULL) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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goto err;
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}
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i = OBJ_obj2nid(a->algorithm);
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type = EVP_get_digestbyname(OBJ_nid2sn(i));
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if (type == NULL) {
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ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM);
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goto err;
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}
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if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
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ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
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goto err;
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}
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inl = i2d(data, NULL);
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if (inl <= 0) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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buf_in = OPENSSL_malloc((unsigned int)inl);
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if (buf_in == NULL)
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goto err;
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p = buf_in;
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i2d(data, &p);
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ret = EVP_VerifyInit_ex(ctx, type, NULL)
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&& EVP_VerifyUpdate(ctx, (unsigned char *)buf_in, inl);
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OPENSSL_clear_free(buf_in, (unsigned int)inl);
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if (!ret) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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goto err;
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}
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ret = -1;
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if (EVP_VerifyFinal(ctx, (unsigned char *)signature->data,
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(unsigned int)signature->length, pkey) <= 0) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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ret = 0;
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goto err;
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}
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ret = 1;
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err:
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EVP_MD_CTX_free(ctx);
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return ret;
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}
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#endif
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int ASN1_item_verify(const ASN1_ITEM *it, const X509_ALGOR *alg,
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const ASN1_BIT_STRING *signature, const void *data,
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EVP_PKEY *pkey)
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{
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return ASN1_item_verify_ex(it, alg, signature, data, NULL, pkey, NULL, NULL);
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}
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int ASN1_item_verify_ex(const ASN1_ITEM *it, const X509_ALGOR *alg,
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const ASN1_BIT_STRING *signature, const void *data,
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const ASN1_OCTET_STRING *id, EVP_PKEY *pkey,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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EVP_MD_CTX *ctx;
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int rv = -1;
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if ((ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq)) != NULL) {
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rv = ASN1_item_verify_ctx(it, alg, signature, data, ctx);
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EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
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EVP_MD_CTX_free(ctx);
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}
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return rv;
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}
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int ASN1_item_verify_ctx(const ASN1_ITEM *it, const X509_ALGOR *alg,
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const ASN1_BIT_STRING *signature, const void *data,
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EVP_MD_CTX *ctx)
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{
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EVP_PKEY *pkey;
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unsigned char *buf_in = NULL;
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int ret = -1, inl = 0;
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int mdnid, pknid;
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size_t inll = 0;
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pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
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if (pkey == NULL) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_NULL_PARAMETER);
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return -1;
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}
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if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) {
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ERR_raise(ERR_LIB_ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
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return -1;
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}
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/* Convert signature OID into digest and public key OIDs */
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if (!OBJ_find_sigid_algs(OBJ_obj2nid(alg->algorithm), &mdnid, &pknid)) {
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ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
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goto err;
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}
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if (mdnid == NID_undef && evp_pkey_is_legacy(pkey)) {
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if (pkey->ameth == NULL || pkey->ameth->item_verify == NULL) {
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ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM);
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goto err;
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}
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ret = pkey->ameth->item_verify(ctx, it, data, alg, signature, pkey);
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/*
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* Return values meaning:
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* <=0: error.
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* 1: method does everything.
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* 2: carry on as normal, method has called EVP_DigestVerifyInit()
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*/
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if (ret <= 0)
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ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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if (ret <= 1)
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goto err;
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} else {
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const EVP_MD *type = NULL;
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/*
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* We don't yet have the ability for providers to be able to handle
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* X509_ALGOR style parameters. Fortunately the only one that needs this
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* so far is RSA-PSS, so we just special case this for now. In some
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* future version of OpenSSL we should push this to the provider.
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*/
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if (mdnid == NID_undef && pknid == EVP_PKEY_RSA_PSS) {
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if (!EVP_PKEY_is_a(pkey, "RSA") && !EVP_PKEY_is_a(pkey, "RSA-PSS")) {
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ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
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goto err;
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}
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/* This function also calls EVP_DigestVerifyInit */
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if (ossl_rsa_pss_to_ctx(ctx, NULL, alg, pkey) <= 0) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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} else {
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/* Check public key OID matches public key type */
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if (!EVP_PKEY_is_a(pkey, OBJ_nid2sn(pknid))) {
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ERR_raise(ERR_LIB_ASN1, ASN1_R_WRONG_PUBLIC_KEY_TYPE);
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goto err;
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}
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if (mdnid != NID_undef) {
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type = EVP_get_digestbynid(mdnid);
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if (type == NULL) {
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ERR_raise_data(ERR_LIB_ASN1,
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ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM,
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"nid=0x%x", mdnid);
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goto err;
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}
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}
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/*
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* Note that some algorithms (notably Ed25519 and Ed448) may allow
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* a NULL digest value.
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*/
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if (!EVP_DigestVerifyInit(ctx, NULL, type, NULL, pkey)) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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ret = 0;
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goto err;
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}
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}
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}
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inl = ASN1_item_i2d(data, &buf_in, it);
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if (inl <= 0) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
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goto err;
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}
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if (buf_in == NULL) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_ASN1_LIB);
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goto err;
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}
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inll = inl;
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ret = EVP_DigestVerify(ctx, signature->data, (size_t)signature->length,
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buf_in, inl);
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if (ret <= 0) {
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ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
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goto err;
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}
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ret = 1;
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err:
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OPENSSL_clear_free(buf_in, inll);
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return ret;
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}
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