1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include <openssl/rc4.h>
#include "crypto/s2n_cipher.h"
#include "crypto/s2n_fips.h"
#include "crypto/s2n_openssl.h"
#include "utils/s2n_blob.h"
#include "utils/s2n_safety.h"
static uint8_t s2n_stream_cipher_rc4_available()
{
#ifdef S2N_LIBCRYPTO_SUPPORTS_EVP_RC4
if (s2n_is_in_fips_mode()) {
return 0;
} else {
return (EVP_rc4() ? 1 : 0);
}
#else
return 0;
#endif /* S2N_LIBCRYPTO_SUPPORTS_EVP_RC4 */
}
#ifdef S2N_LIBCRYPTO_SUPPORTS_EVP_RC4
static int s2n_stream_cipher_rc4_encrypt(struct s2n_session_key *key, struct s2n_blob *in, struct s2n_blob *out)
{
POSIX_ENSURE_GTE(out->size, in->size);
/* len is set by EVP_EncryptUpdate and checked post operation */
int len = 0;
POSIX_GUARD_OSSL(EVP_EncryptUpdate(key->evp_cipher_ctx, out->data, &len, in->data, in->size), S2N_ERR_ENCRYPT);
S2N_ERROR_IF(len != in->size, S2N_ERR_ENCRYPT);
return 0;
}
static int s2n_stream_cipher_rc4_decrypt(struct s2n_session_key *key, struct s2n_blob *in, struct s2n_blob *out)
{
POSIX_ENSURE_GTE(out->size, in->size);
/* len is set by EVP_DecryptUpdate and checked post operation */
int len = 0;
POSIX_GUARD_OSSL(EVP_DecryptUpdate(key->evp_cipher_ctx, out->data, &len, in->data, in->size), S2N_ERR_DECRYPT);
S2N_ERROR_IF(len != in->size, S2N_ERR_DECRYPT);
return 0;
}
static int s2n_stream_cipher_rc4_set_encryption_key(struct s2n_session_key *key, struct s2n_blob *in)
{
POSIX_ENSURE_EQ(in->size, 16);
POSIX_GUARD_OSSL(EVP_EncryptInit_ex(key->evp_cipher_ctx, EVP_rc4(), NULL, in->data, NULL), S2N_ERR_KEY_INIT);
return 0;
}
static int s2n_stream_cipher_rc4_set_decryption_key(struct s2n_session_key *key, struct s2n_blob *in)
{
POSIX_ENSURE_EQ(in->size, 16);
POSIX_GUARD_OSSL(EVP_DecryptInit_ex(key->evp_cipher_ctx, EVP_rc4(), NULL, in->data, NULL), S2N_ERR_KEY_INIT);
return 0;
}
static int s2n_stream_cipher_rc4_init(struct s2n_session_key *key)
{
s2n_evp_ctx_init(key->evp_cipher_ctx);
return 0;
}
static int s2n_stream_cipher_rc4_destroy_key(struct s2n_session_key *key)
{
EVP_CIPHER_CTX_cleanup(key->evp_cipher_ctx);
return 0;
}
#else
static int s2n_stream_cipher_rc4_encrypt(struct s2n_session_key *key, struct s2n_blob *in, struct s2n_blob *out)
{
POSIX_BAIL(S2N_ERR_UNIMPLEMENTED);
}
static int s2n_stream_cipher_rc4_decrypt(struct s2n_session_key *key, struct s2n_blob *in, struct s2n_blob *out)
{
POSIX_BAIL(S2N_ERR_UNIMPLEMENTED);
}
static int s2n_stream_cipher_rc4_set_encryption_key(struct s2n_session_key *key, struct s2n_blob *in)
{
POSIX_BAIL(S2N_ERR_UNIMPLEMENTED);
}
static int s2n_stream_cipher_rc4_set_decryption_key(struct s2n_session_key *key, struct s2n_blob *in)
{
POSIX_BAIL(S2N_ERR_UNIMPLEMENTED);
}
static int s2n_stream_cipher_rc4_init(struct s2n_session_key *key)
{
POSIX_BAIL(S2N_ERR_UNIMPLEMENTED);
}
static int s2n_stream_cipher_rc4_destroy_key(struct s2n_session_key *key)
{
POSIX_BAIL(S2N_ERR_UNIMPLEMENTED);
}
#endif /* S2N_LIBCRYPTO_SUPPORTS_EVP_RC4 */
const struct s2n_cipher s2n_rc4 = {
.type = S2N_STREAM,
.key_material_size = 16,
.io.stream = {
.decrypt = s2n_stream_cipher_rc4_decrypt,
.encrypt = s2n_stream_cipher_rc4_encrypt },
.is_available = s2n_stream_cipher_rc4_available,
.init = s2n_stream_cipher_rc4_init,
.set_decryption_key = s2n_stream_cipher_rc4_set_decryption_key,
.set_encryption_key = s2n_stream_cipher_rc4_set_encryption_key,
.destroy_key = s2n_stream_cipher_rc4_destroy_key,
};
|
