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/poly1305.h" |
15 | #include "crypto/evp.h" |
16 | |
17 | /* |
18 | * POLY1305 "ASN1" method. This is just here to indicate the maximum |
19 | * POLY1305 output length and to free up a POLY1305 key. |
20 | */ |
21 | |
22 | static int poly1305_size(const EVP_PKEY *pkey) |
23 | { |
24 | return POLY1305_DIGEST_SIZE; |
25 | } |
26 | |
27 | static void poly1305_key_free(EVP_PKEY *pkey) |
28 | { |
29 | ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey); |
30 | if (os != NULL) { |
31 | if (os->data != NULL) |
32 | OPENSSL_cleanse(os->data, os->length); |
33 | ASN1_OCTET_STRING_free(os); |
34 | } |
35 | } |
36 | |
37 | static int poly1305_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) |
38 | { |
39 | /* nothing, (including ASN1_PKEY_CTRL_DEFAULT_MD_NID), is supported */ |
40 | return -2; |
41 | } |
42 | |
43 | static int poly1305_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
44 | { |
45 | return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b)); |
46 | } |
47 | |
48 | static int poly1305_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv, |
49 | size_t len) |
50 | { |
51 | ASN1_OCTET_STRING *os; |
52 | |
53 | if (pkey->pkey.ptr != NULL || len != POLY1305_KEY_SIZE) |
54 | return 0; |
55 | |
56 | os = ASN1_OCTET_STRING_new(); |
57 | if (os == NULL) |
58 | return 0; |
59 | |
60 | if (!ASN1_OCTET_STRING_set(os, priv, len)) { |
61 | ASN1_OCTET_STRING_free(os); |
62 | return 0; |
63 | } |
64 | |
65 | pkey->pkey.ptr = os; |
66 | return 1; |
67 | } |
68 | |
69 | static int poly1305_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv, |
70 | size_t *len) |
71 | { |
72 | ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr; |
73 | |
74 | if (priv == NULL) { |
75 | *len = POLY1305_KEY_SIZE; |
76 | return 1; |
77 | } |
78 | |
79 | if (os == NULL || *len < POLY1305_KEY_SIZE) |
80 | return 0; |
81 | |
82 | memcpy(priv, ASN1_STRING_get0_data(os), ASN1_STRING_length(os)); |
83 | *len = POLY1305_KEY_SIZE; |
84 | |
85 | return 1; |
86 | } |
87 | |
88 | const EVP_PKEY_ASN1_METHOD poly1305_asn1_meth = { |
89 | EVP_PKEY_POLY1305, |
90 | EVP_PKEY_POLY1305, |
91 | 0, |
92 | |
93 | "POLY1305" , |
94 | "OpenSSL POLY1305 method" , |
95 | |
96 | 0, 0, poly1305_pkey_public_cmp, 0, |
97 | |
98 | 0, 0, 0, |
99 | |
100 | poly1305_size, |
101 | 0, 0, |
102 | 0, 0, 0, 0, 0, 0, 0, |
103 | |
104 | poly1305_key_free, |
105 | poly1305_pkey_ctrl, |
106 | NULL, |
107 | NULL, |
108 | |
109 | NULL, |
110 | NULL, |
111 | NULL, |
112 | |
113 | NULL, |
114 | NULL, |
115 | NULL, |
116 | |
117 | poly1305_set_priv_key, |
118 | NULL, |
119 | poly1305_get_priv_key, |
120 | NULL, |
121 | }; |
122 | |