120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
/*
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* Copyright 2007-2016 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 "internal/asn1_int.h"
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#define HMAC_TEST_PRIVATE_KEY_FORMAT
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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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#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
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/*
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* A bogus private key format for test purposes. This is simply the HMAC key
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* with "HMAC PRIVATE KEY" in the headers. When enabled the genpkey utility
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* can be used to "generate" HMAC keys.
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*/
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static int old_hmac_decode(EVP_PKEY *pkey,
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const unsigned char **pder, int derlen)
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{
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ASN1_OCTET_STRING *os;
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os = ASN1_OCTET_STRING_new();
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if (os == NULL || !ASN1_OCTET_STRING_set(os, *pder, derlen))
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goto err;
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if (!EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os))
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goto err;
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return 1;
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err:
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ASN1_OCTET_STRING_free(os);
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return 0;
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}
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static int old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
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{
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int inc;
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ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
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if (pder) {
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if (!*pder) {
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*pder = OPENSSL_malloc(os->length);
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if (*pder == NULL)
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return -1;
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inc = 0;
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} else
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inc = 1;
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memcpy(*pder, os->data, os->length);
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if (inc)
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*pder += os->length;
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}
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return os->length;
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}
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#endif
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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, 0, 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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#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
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old_hmac_decode,
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old_hmac_encode
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#else
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0, 0
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#endif
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};
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