1/*
2 * Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/evp.h>
13#include "crypto/asn1.h"
14#include "crypto/siphash.h"
15#include "siphash_local.h"
16#include "crypto/evp.h"
17
18/*
19 * SIPHASH "ASN1" method. This is just here to indicate the maximum
20 * SIPHASH output length and to free up a SIPHASH key.
21 */
22
23static int siphash_size(const EVP_PKEY *pkey)
24{
25 return SIPHASH_MAX_DIGEST_SIZE;
26}
27
28static void siphash_key_free(EVP_PKEY *pkey)
29{
30 ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
31
32 if (os != NULL) {
33 if (os->data != NULL)
34 OPENSSL_cleanse(os->data, os->length);
35 ASN1_OCTET_STRING_free(os);
36 }
37}
38
39static int siphash_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
40{
41 /* nothing (including ASN1_PKEY_CTRL_DEFAULT_MD_NID), is supported */
42 return -2;
43}
44
45static int siphash_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
46{
47 return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b));
48}
49
50static int siphash_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv,
51 size_t len)
52{
53 ASN1_OCTET_STRING *os;
54
55 if (pkey->pkey.ptr != NULL || len != SIPHASH_KEY_SIZE)
56 return 0;
57
58 os = ASN1_OCTET_STRING_new();
59 if (os == NULL)
60 return 0;
61
62 if (!ASN1_OCTET_STRING_set(os, priv, len)) {
63 ASN1_OCTET_STRING_free(os);
64 return 0;
65 }
66
67 pkey->pkey.ptr = os;
68 return 1;
69}
70
71static int siphash_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv,
72 size_t *len)
73{
74 ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
75
76 if (priv == NULL) {
77 *len = SIPHASH_KEY_SIZE;
78 return 1;
79 }
80
81 if (os == NULL || *len < SIPHASH_KEY_SIZE)
82 return 0;
83
84 memcpy(priv, ASN1_STRING_get0_data(os), ASN1_STRING_length(os));
85 *len = SIPHASH_KEY_SIZE;
86
87 return 1;
88}
89
90const EVP_PKEY_ASN1_METHOD siphash_asn1_meth = {
91 EVP_PKEY_SIPHASH,
92 EVP_PKEY_SIPHASH,
93 0,
94
95 "SIPHASH",
96 "OpenSSL SIPHASH method",
97
98 0, 0, siphash_pkey_public_cmp, 0,
99
100 0, 0, 0,
101
102 siphash_size,
103 0, 0,
104 0, 0, 0, 0, 0, 0, 0,
105
106 siphash_key_free,
107 siphash_pkey_ctrl,
108 NULL,
109 NULL,
110
111 NULL,
112 NULL,
113 NULL,
114
115 NULL,
116 NULL,
117 NULL,
118
119 siphash_set_priv_key,
120 NULL,
121 siphash_get_priv_key,
122 NULL,
123};
124