/src/openssl111/crypto/hmac/hm_ameth.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Copyright 2007-2021 The OpenSSL Project Authors. All Rights Reserved. |
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 "crypto/asn1.h" |
14 | | #include "crypto/evp.h" |
15 | | |
16 | | /* |
17 | | * HMAC "ASN1" method. This is just here to indicate the maximum HMAC output |
18 | | * length and to free up an HMAC key. |
19 | | */ |
20 | | |
21 | | static int hmac_size(const EVP_PKEY *pkey) |
22 | 0 | { |
23 | 0 | return EVP_MAX_MD_SIZE; |
24 | 0 | } |
25 | | |
26 | | static void hmac_key_free(EVP_PKEY *pkey) |
27 | 0 | { |
28 | 0 | ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey); |
29 | 0 | if (os) { |
30 | 0 | if (os->data) |
31 | 0 | OPENSSL_cleanse(os->data, os->length); |
32 | 0 | ASN1_OCTET_STRING_free(os); |
33 | 0 | } |
34 | 0 | } |
35 | | |
36 | | static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) |
37 | 0 | { |
38 | 0 | switch (op) { |
39 | 0 | case ASN1_PKEY_CTRL_DEFAULT_MD_NID: |
40 | 0 | *(int *)arg2 = NID_sha256; |
41 | 0 | return 1; |
42 | | |
43 | 0 | default: |
44 | 0 | return -2; |
45 | 0 | } |
46 | 0 | } |
47 | | |
48 | | static int hmac_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b) |
49 | 0 | { |
50 | | /* the ameth pub_cmp must return 1 on match, 0 on mismatch */ |
51 | 0 | return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b)) == 0; |
52 | 0 | } |
53 | | |
54 | | static int hmac_set_priv_key(EVP_PKEY *pkey, const unsigned char *priv, |
55 | | size_t len) |
56 | 0 | { |
57 | 0 | ASN1_OCTET_STRING *os; |
58 | |
|
59 | 0 | if (pkey->pkey.ptr != NULL) |
60 | 0 | return 0; |
61 | | |
62 | 0 | os = ASN1_OCTET_STRING_new(); |
63 | 0 | if (os == NULL) |
64 | 0 | return 0; |
65 | | |
66 | | |
67 | 0 | if (!ASN1_OCTET_STRING_set(os, priv, len)) { |
68 | 0 | ASN1_OCTET_STRING_free(os); |
69 | 0 | return 0; |
70 | 0 | } |
71 | | |
72 | 0 | pkey->pkey.ptr = os; |
73 | 0 | return 1; |
74 | 0 | } |
75 | | |
76 | | static int hmac_get_priv_key(const EVP_PKEY *pkey, unsigned char *priv, |
77 | | size_t *len) |
78 | 0 | { |
79 | 0 | ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr; |
80 | |
|
81 | 0 | if (priv == NULL) { |
82 | 0 | *len = ASN1_STRING_length(os); |
83 | 0 | return 1; |
84 | 0 | } |
85 | | |
86 | 0 | if (os == NULL || *len < (size_t)ASN1_STRING_length(os)) |
87 | 0 | return 0; |
88 | | |
89 | 0 | *len = ASN1_STRING_length(os); |
90 | 0 | memcpy(priv, ASN1_STRING_get0_data(os), *len); |
91 | |
|
92 | 0 | return 1; |
93 | 0 | } |
94 | | |
95 | | const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = { |
96 | | EVP_PKEY_HMAC, |
97 | | EVP_PKEY_HMAC, |
98 | | 0, |
99 | | |
100 | | "HMAC", |
101 | | "OpenSSL HMAC method", |
102 | | |
103 | | 0, 0, hmac_pkey_public_cmp, 0, |
104 | | |
105 | | 0, 0, 0, |
106 | | |
107 | | hmac_size, |
108 | | 0, 0, |
109 | | 0, 0, 0, 0, 0, 0, 0, |
110 | | |
111 | | hmac_key_free, |
112 | | hmac_pkey_ctrl, |
113 | | NULL, |
114 | | NULL, |
115 | | |
116 | | NULL, |
117 | | NULL, |
118 | | NULL, |
119 | | |
120 | | NULL, |
121 | | NULL, |
122 | | NULL, |
123 | | |
124 | | hmac_set_priv_key, |
125 | | NULL, |
126 | | hmac_get_priv_key, |
127 | | NULL, |
128 | | }; |