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Commit f07edd3f authored by James Morris's avatar James Morris Committed by David S. Miller
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[CRYPTO]: Add Tnepres cipher support 

This patch adds support for the kerneli 'Tnepres' cipher, a reversed form
of Serpent which was implemented due to problems with the specification.
This allows people to maintain compatibility between old kerneli and
current kernels.
Signed-off-by: default avatarRuben Garcia <ruben@ugr.es>
Signed-off-by: default avatarFruhwirth Clemens <clemens@endorphin.org>
Signed-off-by: default avatarJames Morris <jmorris@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1f5a4ea1
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Showing with 207 additions and 10 deletions
crypto/Kconfig
View file @ f07edd3f
......@@ -125,7 +125,8 @@ config CRYPTO_SERPENT
Serpent cipher algorithm, by Anderson, Biham & Knudsen.
Keys are allowed to be from 0 to 256 bits in length, in steps
of 8 bits.
of 8 bits. Also includes the 'Tnepres' algorithm, a reversed
variant of Serpent for compatibility with old kerneli code.
See also:
http://www.cl.cam.ac.uk/~rja14/serpent.html
......
crypto/serpent.c
View file @ f07edd3f
......@@ -4,6 +4,10 @@
* Serpent Cipher Algorithm.
*
* Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no>
* 2003 Herbert Valerio Riedel <hvr@gnu.org>
*
* Added tnepres support: Ruben Jesus Garcia Hernandez <ruben@ugr.es>, 18.10.2004
* Based on code by hvr
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
......@@ -212,7 +216,8 @@ struct serpent_ctx {
u32 expkey[SERPENT_EXPKEY_WORDS];
};
static int setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
static int serpent_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
{
u32 *k = ((struct serpent_ctx *)ctx)->expkey;
u8 *k8 = (u8 *)k;
......@@ -362,7 +367,7 @@ static int setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
return 0;
}
static void encrypt(void *ctx, u8 *dst, const u8 *src)
static void serpent_encrypt(void *ctx, u8 *dst, const u8 *src)
{
const u32
*k = ((struct serpent_ctx *)ctx)->expkey,
......@@ -420,7 +425,7 @@ static void encrypt(void *ctx, u8 *dst, const u8 *src)
d[3] = cpu_to_le32(r3);
}
static void decrypt(void *ctx, u8 *dst, const u8 *src)
static void serpent_decrypt(void *ctx, u8 *dst, const u8 *src)
{
const u32
*k = ((struct serpent_ctx *)ctx)->expkey,
......@@ -483,18 +488,101 @@ static struct crypto_alg serpent_alg = {
.cra_u = { .cipher = {
.cia_min_keysize = SERPENT_MIN_KEY_SIZE,
.cia_max_keysize = SERPENT_MAX_KEY_SIZE,
.cia_setkey = setkey,
.cia_encrypt = encrypt,
.cia_decrypt = decrypt } }
.cia_setkey = serpent_setkey,
.cia_encrypt = serpent_encrypt,
.cia_decrypt = serpent_decrypt } }
};
static int tnepres_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
{
u8 rev_key[SERPENT_MAX_KEY_SIZE];
int i;
if ((keylen < SERPENT_MIN_KEY_SIZE)
|| (keylen > SERPENT_MAX_KEY_SIZE)) {
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
for (i = 0; i < keylen; ++i)
rev_key[keylen - i - 1] = key[i];
return serpent_setkey(ctx, rev_key, keylen, flags);
}
static void tnepres_encrypt(void *ctx, u8 *dst, const u8 *src)
{
const u32 * const s = (const u32 * const)src;
u32 * const d = (u32 * const)dst;
u32 rs[4], rd[4];
rs[0] = swab32(s[3]);
rs[1] = swab32(s[2]);
rs[2] = swab32(s[1]);
rs[3] = swab32(s[0]);
serpent_encrypt(ctx, (u8 *)rd, (u8 *)rs);
d[0] = swab32(rd[3]);
d[1] = swab32(rd[2]);
d[2] = swab32(rd[1]);
d[3] = swab32(rd[0]);
}
static void tnepres_decrypt(void *ctx, u8 *dst, const u8 *src)
{
const u32 * const s = (const u32 * const)src;
u32 * const d = (u32 * const)dst;
u32 rs[4], rd[4];
rs[0] = swab32(s[3]);
rs[1] = swab32(s[2]);
rs[2] = swab32(s[1]);
rs[3] = swab32(s[0]);
serpent_decrypt(ctx, (u8 *)rd, (u8 *)rs);
d[0] = swab32(rd[3]);
d[1] = swab32(rd[2]);
d[2] = swab32(rd[1]);
d[3] = swab32(rd[0]);
}
static struct crypto_alg tnepres_alg = {
.cra_name = "tnepres",
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = SERPENT_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct serpent_ctx),
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(serpent_alg.cra_list),
.cra_u = { .cipher = {
.cia_min_keysize = SERPENT_MIN_KEY_SIZE,
.cia_max_keysize = SERPENT_MAX_KEY_SIZE,
.cia_setkey = tnepres_setkey,
.cia_encrypt = tnepres_encrypt,
.cia_decrypt = tnepres_decrypt } }
};
static int __init init(void)
{
return crypto_register_alg(&serpent_alg);
int ret = crypto_register_alg(&serpent_alg);
if (ret)
return ret;
ret = crypto_register_alg(&tnepres_alg);
if (ret)
crypto_unregister_alg(&serpent_alg);
return ret;
}
static void __exit fini(void)
{
crypto_unregister_alg(&tnepres_alg);
crypto_unregister_alg(&serpent_alg);
}
......@@ -502,5 +590,6 @@ module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Serpent Cipher Algorithm");
MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
MODULE_ALIAS("tnepres");
crypto/tcrypt.c
View file @ f07edd3f
......@@ -63,7 +63,7 @@ static char *check[] = {
"des", "md5", "des3_ede", "rot13", "sha1", "sha256", "blowfish",
"twofish", "serpent", "sha384", "sha512", "md4", "aes", "cast6",
"arc4", "michael_mic", "deflate", "crc32c", "tea", "xtea",
"wp512", "wp384", "wp256", NULL
"wp512", "wp384", "wp256", "tnepres", NULL
};
static void
......@@ -651,6 +651,10 @@ do_test(void)
test_cipher ("serpent", MODE_ECB, ENCRYPT, serpent_enc_tv_template, SERPENT_ENC_TEST_VECTORS);
test_cipher ("serpent", MODE_ECB, DECRYPT, serpent_dec_tv_template, SERPENT_DEC_TEST_VECTORS);
//TNEPRES
test_cipher ("tnepres", MODE_ECB, ENCRYPT, tnepres_enc_tv_template, TNEPRES_ENC_TEST_VECTORS);
test_cipher ("tnepres", MODE_ECB, DECRYPT, tnepres_dec_tv_template, TNEPRES_DEC_TEST_VECTORS);
//AES
test_cipher ("aes", MODE_ECB, ENCRYPT, aes_enc_tv_template, AES_ENC_TEST_VECTORS);
test_cipher ("aes", MODE_ECB, DECRYPT, aes_dec_tv_template, AES_DEC_TEST_VECTORS);
......@@ -739,6 +743,8 @@ do_test(void)
break;
case 9:
test_cipher ("serpent", MODE_ECB, ENCRYPT, serpent_enc_tv_template, SERPENT_ENC_TEST_VECTORS);
test_cipher ("serpent", MODE_ECB, DECRYPT, serpent_dec_tv_template, SERPENT_DEC_TEST_VECTORS);
break;
case 10:
......@@ -808,6 +814,10 @@ do_test(void)
test_hash("wp256", wp256_tv_template, WP256_TEST_VECTORS);
break;
case 25:
test_cipher ("tnepres", MODE_ECB, ENCRYPT, tnepres_enc_tv_template, TNEPRES_ENC_TEST_VECTORS);
test_cipher ("tnepres", MODE_ECB, DECRYPT, tnepres_dec_tv_template, TNEPRES_DEC_TEST_VECTORS);
break;
#ifdef CONFIG_CRYPTO_HMAC
case 100:
......
crypto/tcrypt.h
View file @ f07edd3f
......@@ -1444,6 +1444,9 @@ struct cipher_testvec tf_cbc_dec_tv_template[] = {
#define SERPENT_ENC_TEST_VECTORS 4
#define SERPENT_DEC_TEST_VECTORS 4
#define TNEPRES_ENC_TEST_VECTORS 4
#define TNEPRES_DEC_TEST_VECTORS 4
struct cipher_testvec serpent_enc_tv_template[] =
{
{
......@@ -1486,6 +1489,57 @@ struct cipher_testvec serpent_enc_tv_template[] =
},
};
struct cipher_testvec tnepres_enc_tv_template[] =
{
{ /* KeySize=128, PT=0, I=1 */
.input = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
.key = { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
.klen = 16,
.ilen = 16,
.result = { 0x49, 0xaf, 0xbf, 0xad, 0x9d, 0x5a, 0x34, 0x05,
0x2c, 0xd8, 0xff, 0xa5, 0x98, 0x6b, 0xd2, 0xdd },
.rlen = 16,
}, { /* KeySize=192, PT=0, I=1 */
.key = { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
.klen = 24,
.input = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
.ilen = 16,
.result = { 0xe7, 0x8e, 0x54, 0x02, 0xc7, 0x19, 0x55, 0x68,
0xac, 0x36, 0x78, 0xf7, 0xa3, 0xf6, 0x0c, 0x66 },
.rlen = 16,
}, { /* KeySize=256, PT=0, I=1 */
.key = { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
.klen = 32,
.input = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
.ilen = 16,
.result = { 0xab, 0xed, 0x96, 0xe7, 0x66, 0xbf, 0x28, 0xcb,
0xc0, 0xeb, 0xd2, 0x1a, 0x82, 0xef, 0x08, 0x19 },
.rlen = 16,
}, { /* KeySize=256, I=257 */
.key = { 0x1f, 0x1e, 0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x18,
0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00 },
.klen = 32,
.input = { 0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00 },
.ilen = 16,
.result = { 0x5c, 0xe7, 0x1c, 0x70, 0xd2, 0x88, 0x2e, 0x5b,
0xb8, 0x32, 0xe4, 0x33, 0xf8, 0x9f, 0x26, 0xde },
.rlen = 16,
},
};
struct cipher_testvec serpent_dec_tv_template[] =
{
{
......@@ -1528,6 +1582,49 @@ struct cipher_testvec serpent_dec_tv_template[] =
},
};
struct cipher_testvec tnepres_dec_tv_template[] =
{
{
.input = { 0x41, 0xcc, 0x6b, 0x31, 0x59, 0x31, 0x45, 0x97,
0x6d, 0x6f, 0xbb, 0x38, 0x4b, 0x37, 0x21, 0x28 },
.ilen = 16,
.result = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
.rlen = 16,
}, {
.key = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
.klen = 16,
.input = { 0xea, 0xf4, 0xd7, 0xfc, 0xd8, 0x01, 0x34, 0x47,
0x81, 0x45, 0x0b, 0xfa, 0x0c, 0xd6, 0xad, 0x6e },
.ilen = 16,
.result = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
.rlen = 16,
}, {
.key = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
.klen = 32,
.input = { 0x64, 0xa9, 0x1a, 0x37, 0xed, 0x9f, 0xe7, 0x49,
0xa8, 0x4e, 0x76, 0xd6, 0xf5, 0x0d, 0x78, 0xee },
.ilen = 16,
.result = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
.rlen = 16,
}, { /* KeySize=128, I=121 */
.key = { [15] = 0x80 },
.klen = 16,
.input = { 0x3d, 0xda, 0xbf, 0xc0, 0x06, 0xda, 0xab, 0x06,
0x46, 0x2a, 0xf4, 0xef, 0x81, 0x54, 0x4e, 0x26 },
.ilen = 16,
.result = { [0 ... 15] = 0x00 },
.rlen = 16,
},
};
/* Cast6 test vectors from RFC 2612 */
#define CAST6_ENC_TEST_VECTORS 3
#define CAST6_DEC_TEST_VECTORS 3
......
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