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| /*
| * Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
| *
| * Licensed under the OpenSSL license (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 "internal/cryptlib.h"
| #include <openssl/evp.h>
| #include "crypto/asn1.h"
| #include "crypto/evp.h"
|
| /*
| * HMAC "ASN1" method. This is just here to indicate the maximum HMAC output
| * length and to free up an HMAC key.
| */
|
| static int hmac_size(const EVP_PKEY *pkey)
| {
| return EVP_MAX_MD_SIZE;
| }
|
| static void hmac_key_free(EVP_PKEY *pkey)
| {
| ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
| if (os) {
| if (os->data)
| OPENSSL_cleanse(os->data, os->length);
| ASN1_OCTET_STRING_free(os);
| }
| }
|
| static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
| {
| switch (op) {
| case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
| *(int *)arg2 = NID_sha256;
| return 1;
|
| default:
| return -2;
| }
| }
|
| static int hmac_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
| {
| return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b));
| }
|
| static int hmac_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
| size_t len)
| {
| ASN1_OCTET_STRING *os;
|
| if (pkey->pkey.ptr != NULL)
| return 0;
|
| os = ASN1_OCTET_STRING_new();
| if (os == NULL)
| return 0;
|
|
| if (!ASN1_OCTET_STRING_set(os, priv, len)) {
| ASN1_OCTET_STRING_free(os);
| return 0;
| }
|
| pkey->pkey.ptr = os;
| return 1;
| }
|
| static int hmac_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
| size_t *len)
| {
| ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
|
| if (priv == NULL) {
| *len = ASN1_STRING_length(os);
| return 1;
| }
|
| if (os == NULL || *len < (size_t)ASN1_STRING_length(os))
| return 0;
|
| *len = ASN1_STRING_length(os);
| memcpy(priv, ASN1_STRING_get0_data(os), *len);
|
| return 1;
| }
|
| const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
| EVP_PKEY_HMAC,
| EVP_PKEY_HMAC,
| 0,
|
| "HMAC",
| "OpenSSL HMAC method",
|
| 0, 0, hmac_pkey_public_cmp, 0,
|
| 0, 0, 0,
|
| hmac_size,
| 0, 0,
| 0, 0, 0, 0, 0, 0, 0,
|
| hmac_key_free,
| hmac_pkey_ctrl,
| NULL,
| NULL,
|
| NULL,
| NULL,
| NULL,
|
| NULL,
| NULL,
| NULL,
|
| hmac_set_priv_key,
| NULL,
| hmac_get_priv_key,
| NULL,
| };
|
|
