1 // Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <openssl/cipher.h>
16
17 #include <assert.h>
18 #include <string.h>
19
20 #include <openssl/err.h>
21 #include <openssl/mem.h>
22 #include <openssl/nid.h>
23
24 #include "internal.h"
25 #include "../internal.h"
26
27
28 static const struct {
29 int nid;
30 const char *name;
31 const EVP_CIPHER *(*func)(void);
32 } kCiphers[] = {
33 {NID_aes_128_cbc, "aes-128-cbc", EVP_aes_128_cbc},
34 {NID_aes_128_ctr, "aes-128-ctr", EVP_aes_128_ctr},
35 {NID_aes_128_ecb, "aes-128-ecb", EVP_aes_128_ecb},
36 {NID_aes_128_gcm, "aes-128-gcm", EVP_aes_128_gcm},
37 {NID_aes_128_ofb128, "aes-128-ofb", EVP_aes_128_ofb},
38 {NID_aes_192_cbc, "aes-192-cbc", EVP_aes_192_cbc},
39 {NID_aes_192_ctr, "aes-192-ctr", EVP_aes_192_ctr},
40 {NID_aes_192_ecb, "aes-192-ecb", EVP_aes_192_ecb},
41 {NID_aes_192_gcm, "aes-192-gcm", EVP_aes_192_gcm},
42 {NID_aes_192_ofb128, "aes-192-ofb", EVP_aes_192_ofb},
43 {NID_aes_256_cbc, "aes-256-cbc", EVP_aes_256_cbc},
44 {NID_aes_256_ctr, "aes-256-ctr", EVP_aes_256_ctr},
45 {NID_aes_256_ecb, "aes-256-ecb", EVP_aes_256_ecb},
46 {NID_aes_256_gcm, "aes-256-gcm", EVP_aes_256_gcm},
47 {NID_aes_256_ofb128, "aes-256-ofb", EVP_aes_256_ofb},
48 {NID_des_cbc, "des-cbc", EVP_des_cbc},
49 {NID_des_ecb, "des-ecb", EVP_des_ecb},
50 {NID_des_ede_cbc, "des-ede-cbc", EVP_des_ede_cbc},
51 {NID_des_ede_ecb, "des-ede", EVP_des_ede},
52 {NID_des_ede3_cbc, "des-ede3-cbc", EVP_des_ede3_cbc},
53 {NID_rc2_cbc, "rc2-cbc", EVP_rc2_cbc},
54 {NID_rc4, "rc4", EVP_rc4},
55 };
56
EVP_get_cipherbynid(int nid)57 const EVP_CIPHER *EVP_get_cipherbynid(int nid) {
58 for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kCiphers); i++) {
59 if (kCiphers[i].nid == nid) {
60 return kCiphers[i].func();
61 }
62 }
63 return NULL;
64 }
65
EVP_get_cipherbyname(const char * name)66 const EVP_CIPHER *EVP_get_cipherbyname(const char *name) {
67 if (name == NULL) {
68 return NULL;
69 }
70
71 // This is not a name used by OpenSSL, but tcpdump registers it with
72 // |EVP_add_cipher_alias|. Our |EVP_add_cipher_alias| is a no-op, so we
73 // support the name here.
74 if (OPENSSL_strcasecmp(name, "3des") == 0) {
75 name = "des-ede3-cbc";
76 }
77
78 for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kCiphers); i++) {
79 if (OPENSSL_strcasecmp(kCiphers[i].name, name) == 0) {
80 return kCiphers[i].func();
81 }
82 }
83
84 return NULL;
85 }
86