4 * s390 implementation of the AES Cipher Algorithm.
7 * Copyright (C) 2005 IBM Deutschland GmbH, IBM Corporation
8 * Author(s): Jan Glauber (jang@de.ibm.com)
10 * Derived from "crypto/aes.c"
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/crypto.h>
22 #include "crypt_s390.h"
24 #define AES_MIN_KEY_SIZE 16
25 #define AES_MAX_KEY_SIZE 32
27 /* data block size for all key lengths */
28 #define AES_BLOCK_SIZE 16
35 u8 iv
[AES_BLOCK_SIZE
];
36 u8 key
[AES_MAX_KEY_SIZE
];
40 static int aes_set_key(void *ctx
, const u8
*in_key
, unsigned int key_len
,
43 struct s390_aes_ctx
*sctx
= ctx
;
60 /* invalid key length */
65 sctx
->key_len
= key_len
;
66 memcpy(sctx
->key
, in_key
, key_len
);
69 *flags
|= CRYPTO_TFM_RES_BAD_KEY_LEN
;
73 static void aes_encrypt(void *ctx
, u8
*out
, const u8
*in
)
75 const struct s390_aes_ctx
*sctx
= ctx
;
77 switch (sctx
->key_len
) {
79 crypt_s390_km(KM_AES_128_ENCRYPT
, &sctx
->key
, out
, in
,
83 crypt_s390_km(KM_AES_192_ENCRYPT
, &sctx
->key
, out
, in
,
87 crypt_s390_km(KM_AES_256_ENCRYPT
, &sctx
->key
, out
, in
,
93 static void aes_decrypt(void *ctx
, u8
*out
, const u8
*in
)
95 const struct s390_aes_ctx
*sctx
= ctx
;
97 switch (sctx
->key_len
) {
99 crypt_s390_km(KM_AES_128_DECRYPT
, &sctx
->key
, out
, in
,
103 crypt_s390_km(KM_AES_192_DECRYPT
, &sctx
->key
, out
, in
,
107 crypt_s390_km(KM_AES_256_DECRYPT
, &sctx
->key
, out
, in
,
113 static unsigned int aes_encrypt_ecb(const struct cipher_desc
*desc
, u8
*out
,
114 const u8
*in
, unsigned int nbytes
)
116 struct s390_aes_ctx
*sctx
= crypto_tfm_ctx(desc
->tfm
);
118 switch (sctx
->key_len
) {
120 crypt_s390_km(KM_AES_128_ENCRYPT
, &sctx
->key
, out
, in
, nbytes
);
123 crypt_s390_km(KM_AES_192_ENCRYPT
, &sctx
->key
, out
, in
, nbytes
);
126 crypt_s390_km(KM_AES_256_ENCRYPT
, &sctx
->key
, out
, in
, nbytes
);
129 return nbytes
& ~(AES_BLOCK_SIZE
- 1);
132 static unsigned int aes_decrypt_ecb(const struct cipher_desc
*desc
, u8
*out
,
133 const u8
*in
, unsigned int nbytes
)
135 struct s390_aes_ctx
*sctx
= crypto_tfm_ctx(desc
->tfm
);
137 switch (sctx
->key_len
) {
139 crypt_s390_km(KM_AES_128_DECRYPT
, &sctx
->key
, out
, in
, nbytes
);
142 crypt_s390_km(KM_AES_192_DECRYPT
, &sctx
->key
, out
, in
, nbytes
);
145 crypt_s390_km(KM_AES_256_DECRYPT
, &sctx
->key
, out
, in
, nbytes
);
148 return nbytes
& ~(AES_BLOCK_SIZE
- 1);
151 static unsigned int aes_encrypt_cbc(const struct cipher_desc
*desc
, u8
*out
,
152 const u8
*in
, unsigned int nbytes
)
154 struct s390_aes_ctx
*sctx
= crypto_tfm_ctx(desc
->tfm
);
156 memcpy(&sctx
->iv
, desc
->info
, AES_BLOCK_SIZE
);
157 switch (sctx
->key_len
) {
159 crypt_s390_kmc(KMC_AES_128_ENCRYPT
, &sctx
->iv
, out
, in
, nbytes
);
162 crypt_s390_kmc(KMC_AES_192_ENCRYPT
, &sctx
->iv
, out
, in
, nbytes
);
165 crypt_s390_kmc(KMC_AES_256_ENCRYPT
, &sctx
->iv
, out
, in
, nbytes
);
168 memcpy(desc
->info
, &sctx
->iv
, AES_BLOCK_SIZE
);
170 return nbytes
& ~(AES_BLOCK_SIZE
- 1);
173 static unsigned int aes_decrypt_cbc(const struct cipher_desc
*desc
, u8
*out
,
174 const u8
*in
, unsigned int nbytes
)
176 struct s390_aes_ctx
*sctx
= crypto_tfm_ctx(desc
->tfm
);
178 memcpy(&sctx
->iv
, desc
->info
, AES_BLOCK_SIZE
);
179 switch (sctx
->key_len
) {
181 crypt_s390_kmc(KMC_AES_128_DECRYPT
, &sctx
->iv
, out
, in
, nbytes
);
184 crypt_s390_kmc(KMC_AES_192_DECRYPT
, &sctx
->iv
, out
, in
, nbytes
);
187 crypt_s390_kmc(KMC_AES_256_DECRYPT
, &sctx
->iv
, out
, in
, nbytes
);
190 return nbytes
& ~(AES_BLOCK_SIZE
- 1);
194 static struct crypto_alg aes_alg
= {
196 .cra_flags
= CRYPTO_ALG_TYPE_CIPHER
,
197 .cra_blocksize
= AES_BLOCK_SIZE
,
198 .cra_ctxsize
= sizeof(struct s390_aes_ctx
),
199 .cra_module
= THIS_MODULE
,
200 .cra_list
= LIST_HEAD_INIT(aes_alg
.cra_list
),
203 .cia_min_keysize
= AES_MIN_KEY_SIZE
,
204 .cia_max_keysize
= AES_MAX_KEY_SIZE
,
205 .cia_setkey
= aes_set_key
,
206 .cia_encrypt
= aes_encrypt
,
207 .cia_decrypt
= aes_decrypt
,
208 .cia_encrypt_ecb
= aes_encrypt_ecb
,
209 .cia_decrypt_ecb
= aes_decrypt_ecb
,
210 .cia_encrypt_cbc
= aes_encrypt_cbc
,
211 .cia_decrypt_cbc
= aes_decrypt_cbc
,
216 static int __init
aes_init(void)
220 if (crypt_s390_func_available(KM_AES_128_ENCRYPT
))
222 if (crypt_s390_func_available(KM_AES_192_ENCRYPT
))
224 if (crypt_s390_func_available(KM_AES_256_ENCRYPT
))
227 if (!has_aes_128
&& !has_aes_192
&& !has_aes_256
)
230 ret
= crypto_register_alg(&aes_alg
);
232 printk(KERN_INFO
"crypt_s390: aes_s390 couldn't be loaded.\n");
236 static void __exit
aes_fini(void)
238 crypto_unregister_alg(&aes_alg
);
241 module_init(aes_init
);
242 module_exit(aes_fini
);
246 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
247 MODULE_LICENSE("GPL");