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- /*
- * Copyright 2007-2020 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
- */
- /*
- * HMAC low level APIs are deprecated for public use, but still ok for internal
- * use.
- */
- #include "internal/deprecated.h"
- #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,
- };
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