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3f5616d7 | 1 | /* |
b0edda11 | 2 | * Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved. |
3f5616d7 TS |
3 | * |
4 | * Licensed under the OpenSSL license (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 "internal/asn1_int.h" | |
14 | #include "internal/siphash.h" | |
15 | #include "siphash_local.h" | |
5539c5d6 | 16 | #include "internal/evp_int.h" |
3f5616d7 TS |
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 | ||
23 | static int siphash_size(const EVP_PKEY *pkey) | |
24 | { | |
25 | return SIPHASH_MAX_DIGEST_SIZE; | |
26 | } | |
27 | ||
28 | static 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 | ||
39 | static 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 | ||
45 | static 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 | ||
5539c5d6 MC |
50 | static 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 | ||
0d124b0a MC |
71 | static 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 | ||
3f5616d7 TS |
90 | const 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, | |
5539c5d6 MC |
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, | |
0d124b0a MC |
121 | siphash_get_priv_key, |
122 | NULL, | |
3f5616d7 | 123 | }; |