129 lines
2.6 KiB
C
129 lines
2.6 KiB
C
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/*
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* Copyright 2007-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (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 "internal/cryptlib.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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/*
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* HMAC "ASN1" method. This is just here to indicate the maximum HMAC output
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* length and to free up an HMAC key.
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*/
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static int hmac_size(const EVP_PKEY *pkey)
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{
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return EVP_MAX_MD_SIZE;
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}
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static void hmac_key_free(EVP_PKEY *pkey)
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{
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ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
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if (os) {
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if (os->data)
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OPENSSL_cleanse(os->data, os->length);
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ASN1_OCTET_STRING_free(os);
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}
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}
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static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
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{
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switch (op) {
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case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
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*(int *)arg2 = NID_sha256;
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return 1;
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default:
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return -2;
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}
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}
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static int hmac_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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/* the ameth pub_cmp must return 1 on match, 0 on mismatch */
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return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b)) == 0;
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}
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static int hmac_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
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size_t len)
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{
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ASN1_OCTET_STRING *os;
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if (pkey->pkey.ptr != NULL)
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return 0;
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os = ASN1_OCTET_STRING_new();
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if (os == NULL)
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return 0;
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if (!ASN1_OCTET_STRING_set(os, priv, len)) {
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ASN1_OCTET_STRING_free(os);
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return 0;
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}
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pkey->pkey.ptr = os;
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return 1;
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}
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static int hmac_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
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size_t *len)
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{
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ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
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if (priv == NULL) {
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*len = ASN1_STRING_length(os);
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return 1;
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}
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if (os == NULL || *len < (size_t)ASN1_STRING_length(os))
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return 0;
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*len = ASN1_STRING_length(os);
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memcpy(priv, ASN1_STRING_get0_data(os), *len);
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return 1;
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}
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const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
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EVP_PKEY_HMAC,
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EVP_PKEY_HMAC,
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0,
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"HMAC",
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"OpenSSL HMAC method",
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0, 0, hmac_pkey_public_cmp, 0,
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0, 0, 0,
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hmac_size,
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0, 0,
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0, 0, 0, 0, 0, 0, 0,
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hmac_key_free,
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hmac_pkey_ctrl,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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hmac_set_priv_key,
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NULL,
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hmac_get_priv_key,
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NULL,
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};
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