crypto: serpent - get rid of obsolete tnepres variant
It is not trivial to trace back why exactly the tnepres variant of serpent was added ~17 years ago - Google searches come up mostly empty, but it seems to be related with the 'kerneli' version, which was based on an incorrect interpretation of the serpent spec. In other words, nobody is likely to care anymore today, so let's get rid of it. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>master
Ard Biesheuvel
Herbert Xu
parent
e1b2d980f0
commit
784506a1df
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@ -1460,8 +1460,7 @@ config CRYPTO_SERPENT
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Serpent cipher algorithm, by Anderson, Biham & Knudsen.
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Keys are allowed to be from 0 to 256 bits in length, in steps
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of 8 bits. Also includes the 'Tnepres' algorithm, a reversed
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variant of Serpent for compatibility with old kerneli.org code.
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of 8 bits.
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See also:
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<https://www.cl.cam.ac.uk/~rja14/serpent.html>
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@ -5,11 +5,6 @@
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* Serpent Cipher Algorithm.
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*
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* Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no>
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* 2003 Herbert Valerio Riedel <hvr@gnu.org>
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*
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* Added tnepres support:
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* Ruben Jesus Garcia Hernandez <ruben@ugr.es>, 18.10.2004
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* Based on code by hvr
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*/
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#include <linux/init.h>
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@ -576,59 +571,7 @@ static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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__serpent_decrypt(ctx, dst, src);
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}
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static int tnepres_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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u8 rev_key[SERPENT_MAX_KEY_SIZE];
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int i;
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for (i = 0; i < keylen; ++i)
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rev_key[keylen - i - 1] = key[i];
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return serpent_setkey(tfm, rev_key, keylen);
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}
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static void tnepres_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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const u32 * const s = (const u32 * const)src;
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u32 * const d = (u32 * const)dst;
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u32 rs[4], rd[4];
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rs[0] = swab32(s[3]);
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rs[1] = swab32(s[2]);
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rs[2] = swab32(s[1]);
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rs[3] = swab32(s[0]);
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serpent_encrypt(tfm, (u8 *)rd, (u8 *)rs);
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d[0] = swab32(rd[3]);
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d[1] = swab32(rd[2]);
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d[2] = swab32(rd[1]);
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d[3] = swab32(rd[0]);
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}
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static void tnepres_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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const u32 * const s = (const u32 * const)src;
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u32 * const d = (u32 * const)dst;
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u32 rs[4], rd[4];
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rs[0] = swab32(s[3]);
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rs[1] = swab32(s[2]);
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rs[2] = swab32(s[1]);
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rs[3] = swab32(s[0]);
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serpent_decrypt(tfm, (u8 *)rd, (u8 *)rs);
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d[0] = swab32(rd[3]);
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d[1] = swab32(rd[2]);
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d[2] = swab32(rd[1]);
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d[3] = swab32(rd[0]);
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}
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static struct crypto_alg srp_algs[2] = { {
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static struct crypto_alg srp_alg = {
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.cra_name = "serpent",
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.cra_driver_name = "serpent-generic",
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.cra_priority = 100,
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@ -643,38 +586,23 @@ static struct crypto_alg srp_algs[2] = { {
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.cia_setkey = serpent_setkey,
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.cia_encrypt = serpent_encrypt,
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.cia_decrypt = serpent_decrypt } }
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}, {
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.cra_name = "tnepres",
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.cra_driver_name = "tnepres-generic",
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = SERPENT_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct serpent_ctx),
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.cra_alignmask = 3,
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.cra_module = THIS_MODULE,
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.cra_u = { .cipher = {
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.cia_min_keysize = SERPENT_MIN_KEY_SIZE,
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.cia_max_keysize = SERPENT_MAX_KEY_SIZE,
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.cia_setkey = tnepres_setkey,
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.cia_encrypt = tnepres_encrypt,
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.cia_decrypt = tnepres_decrypt } }
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} };
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};
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static int __init serpent_mod_init(void)
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{
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return crypto_register_algs(srp_algs, ARRAY_SIZE(srp_algs));
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return crypto_register_alg(&srp_alg);
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}
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static void __exit serpent_mod_fini(void)
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{
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crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs));
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crypto_unregister_alg(&srp_alg);
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}
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subsys_initcall(serpent_mod_init);
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module_exit(serpent_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
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MODULE_DESCRIPTION("Serpent Cipher Algorithm");
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MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
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MODULE_ALIAS_CRYPTO("tnepres");
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MODULE_ALIAS_CRYPTO("serpent");
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MODULE_ALIAS_CRYPTO("serpent-generic");
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@ -70,7 +70,7 @@ static const char *check[] = {
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"des", "md5", "des3_ede", "rot13", "sha1", "sha224", "sha256", "sm3",
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"blowfish", "twofish", "serpent", "sha384", "sha512", "md4", "aes",
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"cast6", "arc4", "michael_mic", "deflate", "crc32c", "tea", "xtea",
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"khazad", "wp512", "wp384", "wp256", "tnepres", "xeta", "fcrypt",
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"khazad", "wp512", "wp384", "wp256", "xeta", "fcrypt",
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"camellia", "seed", "rmd160",
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"lzo", "lzo-rle", "cts", "sha3-224", "sha3-256", "sha3-384",
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"sha3-512", "streebog256", "streebog512",
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@ -1806,10 +1806,6 @@ static int do_test(const char *alg, u32 type, u32 mask, int m, u32 num_mb)
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ret += tcrypt_test("wp256");
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break;
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case 25:
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ret += tcrypt_test("ecb(tnepres)");
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break;
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case 26:
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ret += tcrypt_test("ecb(anubis)");
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ret += tcrypt_test("cbc(anubis)");
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@ -4876,12 +4876,6 @@ static const struct alg_test_desc alg_test_descs[] = {
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.suite = {
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.cipher = __VECS(tea_tv_template)
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}
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}, {
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.alg = "ecb(tnepres)",
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.test = alg_test_skcipher,
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.suite = {
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.cipher = __VECS(tnepres_tv_template)
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}
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}, {
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.alg = "ecb(twofish)",
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.test = alg_test_skcipher,
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@ -11415,85 +11415,6 @@ static const struct cipher_testvec serpent_tv_template[] = {
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},
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};
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static const struct cipher_testvec tnepres_tv_template[] = {
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{ /* KeySize=0 */
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.ptext = "\x00\x01\x02\x03\x04\x05\x06\x07"
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"\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f",
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.ctext = "\x41\xcc\x6b\x31\x59\x31\x45\x97"
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"\x6d\x6f\xbb\x38\x4b\x37\x21\x28",
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.len = 16,
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},
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{ /* KeySize=128, PT=0, I=1 */
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.ptext = "\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.key = "\x80\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.klen = 16,
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.ctext = "\x49\xaf\xbf\xad\x9d\x5a\x34\x05"
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"\x2c\xd8\xff\xa5\x98\x6b\xd2\xdd",
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.len = 16,
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}, { /* KeySize=128 */
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.key = "\x00\x01\x02\x03\x04\x05\x06\x07"
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"\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f",
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.klen = 16,
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.ptext = "\x00\x01\x02\x03\x04\x05\x06\x07"
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"\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f",
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.ctext = "\xea\xf4\xd7\xfc\xd8\x01\x34\x47"
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"\x81\x45\x0b\xfa\x0c\xd6\xad\x6e",
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.len = 16,
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}, { /* KeySize=128, I=121 */
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.key = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80",
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.klen = 16,
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.ptext = zeroed_string,
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.ctext = "\x3d\xda\xbf\xc0\x06\xda\xab\x06"
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"\x46\x2a\xf4\xef\x81\x54\x4e\x26",
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.len = 16,
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}, { /* KeySize=192, PT=0, I=1 */
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.key = "\x80\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.klen = 24,
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.ptext = "\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.ctext = "\xe7\x8e\x54\x02\xc7\x19\x55\x68"
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"\xac\x36\x78\xf7\xa3\xf6\x0c\x66",
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.len = 16,
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}, { /* KeySize=256, PT=0, I=1 */
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.key = "\x80\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.klen = 32,
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.ptext = "\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00",
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.ctext = "\xab\xed\x96\xe7\x66\xbf\x28\xcb"
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"\xc0\xeb\xd2\x1a\x82\xef\x08\x19",
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.len = 16,
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}, { /* KeySize=256, I=257 */
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.key = "\x1f\x1e\x1d\x1c\x1b\x1a\x19\x18"
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"\x17\x16\x15\x14\x13\x12\x11\x10"
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"\x0f\x0e\x0d\x0c\x0b\x0a\x09\x08"
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"\x07\x06\x05\x04\x03\x02\x01\x00",
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.klen = 32,
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.ptext = "\x0f\x0e\x0d\x0c\x0b\x0a\x09\x08"
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"\x07\x06\x05\x04\x03\x02\x01\x00",
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.ctext = "\x5c\xe7\x1c\x70\xd2\x88\x2e\x5b"
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"\xb8\x32\xe4\x33\xf8\x9f\x26\xde",
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.len = 16,
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}, { /* KeySize=256 */
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.key = "\x00\x01\x02\x03\x04\x05\x06\x07"
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"\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"
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"\x10\x11\x12\x13\x14\x15\x16\x17"
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"\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f",
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.klen = 32,
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.ptext = "\x00\x01\x02\x03\x04\x05\x06\x07"
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"\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f",
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.ctext = "\x64\xa9\x1a\x37\xed\x9f\xe7\x49"
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"\xa8\x4e\x76\xd6\xf5\x0d\x78\xee",
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.len = 16,
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}
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};
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static const struct cipher_testvec serpent_cbc_tv_template[] = {
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{ /* Generated with Crypto++ */
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.key = "\x85\x62\x3F\x1C\xF9\xD6\x1C\xF9"
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