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
22static int poly1305_size(const EVP_PKEY *pkey)
23{
24 return POLY1305_DIGEST_SIZE;
25}
26
27static 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
37static 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
43static 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
48static 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
69static 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
88const 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