diff options
Diffstat (limited to 'crypto/serpent_generic.c')
| -rw-r--r-- | crypto/serpent_generic.c | 165 |
1 files changed, 47 insertions, 118 deletions
diff --git a/crypto/serpent_generic.c b/crypto/serpent_generic.c index 492c1d0bfe06..45f98b750053 100644 --- a/crypto/serpent_generic.c +++ b/crypto/serpent_generic.c @@ -5,17 +5,12 @@ * 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 */ #include <linux/init.h> #include <linux/module.h> #include <linux/errno.h> -#include <asm/byteorder.h> +#include <asm/unaligned.h> #include <linux/crypto.h> #include <linux/types.h> #include <crypto/serpent.h> @@ -277,6 +272,7 @@ int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key, u32 *k = ctx->expkey; u8 *k8 = (u8 *)k; u32 r0, r1, r2, r3, r4; + __le32 *lk; int i; /* Copy key, add padding */ @@ -288,22 +284,32 @@ int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key, while (i < SERPENT_MAX_KEY_SIZE) k8[i++] = 0; + lk = (__le32 *)k; + k[0] = le32_to_cpu(lk[0]); + k[1] = le32_to_cpu(lk[1]); + k[2] = le32_to_cpu(lk[2]); + k[3] = le32_to_cpu(lk[3]); + k[4] = le32_to_cpu(lk[4]); + k[5] = le32_to_cpu(lk[5]); + k[6] = le32_to_cpu(lk[6]); + k[7] = le32_to_cpu(lk[7]); + /* Expand key using polynomial */ - r0 = le32_to_cpu(k[3]); - r1 = le32_to_cpu(k[4]); - r2 = le32_to_cpu(k[5]); - r3 = le32_to_cpu(k[6]); - r4 = le32_to_cpu(k[7]); - - keyiter(le32_to_cpu(k[0]), r0, r4, r2, 0, 0); - keyiter(le32_to_cpu(k[1]), r1, r0, r3, 1, 1); - keyiter(le32_to_cpu(k[2]), r2, r1, r4, 2, 2); - keyiter(le32_to_cpu(k[3]), r3, r2, r0, 3, 3); - keyiter(le32_to_cpu(k[4]), r4, r3, r1, 4, 4); - keyiter(le32_to_cpu(k[5]), r0, r4, r2, 5, 5); - keyiter(le32_to_cpu(k[6]), r1, r0, r3, 6, 6); - keyiter(le32_to_cpu(k[7]), r2, r1, r4, 7, 7); + r0 = k[3]; + r1 = k[4]; + r2 = k[5]; + r3 = k[6]; + r4 = k[7]; + + keyiter(k[0], r0, r4, r2, 0, 0); + keyiter(k[1], r1, r0, r3, 1, 1); + keyiter(k[2], r2, r1, r4, 2, 2); + keyiter(k[3], r3, r2, r0, 3, 3); + keyiter(k[4], r4, r3, r1, 4, 4); + keyiter(k[5], r0, r4, r2, 5, 5); + keyiter(k[6], r1, r0, r3, 6, 6); + keyiter(k[7], r2, r1, r4, 7, 7); keyiter(k[0], r3, r2, r0, 8, 8); keyiter(k[1], r4, r3, r1, 9, 9); @@ -453,19 +459,12 @@ void __serpent_encrypt(const void *c, u8 *dst, const u8 *src) { const struct serpent_ctx *ctx = c; const u32 *k = ctx->expkey; - const __le32 *s = (const __le32 *)src; - __le32 *d = (__le32 *)dst; u32 r0, r1, r2, r3, r4; -/* - * Note: The conversions between u8* and u32* might cause trouble - * on architectures with stricter alignment rules than x86 - */ - - r0 = le32_to_cpu(s[0]); - r1 = le32_to_cpu(s[1]); - r2 = le32_to_cpu(s[2]); - r3 = le32_to_cpu(s[3]); + r0 = get_unaligned_le32(src); + r1 = get_unaligned_le32(src + 4); + r2 = get_unaligned_le32(src + 8); + r3 = get_unaligned_le32(src + 12); K(r0, r1, r2, r3, 0); S0(r0, r1, r2, r3, r4); LK(r2, r1, r3, r0, r4, 1); @@ -501,10 +500,10 @@ void __serpent_encrypt(const void *c, u8 *dst, const u8 *src) S6(r0, r1, r3, r2, r4); LK(r3, r4, r1, r2, r0, 31); S7(r3, r4, r1, r2, r0); K(r0, r1, r2, r3, 32); - d[0] = cpu_to_le32(r0); - d[1] = cpu_to_le32(r1); - d[2] = cpu_to_le32(r2); - d[3] = cpu_to_le32(r3); + put_unaligned_le32(r0, dst); + put_unaligned_le32(r1, dst + 4); + put_unaligned_le32(r2, dst + 8); + put_unaligned_le32(r3, dst + 12); } EXPORT_SYMBOL_GPL(__serpent_encrypt); @@ -519,14 +518,12 @@ void __serpent_decrypt(const void *c, u8 *dst, const u8 *src) { const struct serpent_ctx *ctx = c; const u32 *k = ctx->expkey; - const __le32 *s = (const __le32 *)src; - __le32 *d = (__le32 *)dst; u32 r0, r1, r2, r3, r4; - r0 = le32_to_cpu(s[0]); - r1 = le32_to_cpu(s[1]); - r2 = le32_to_cpu(s[2]); - r3 = le32_to_cpu(s[3]); + r0 = get_unaligned_le32(src); + r1 = get_unaligned_le32(src + 4); + r2 = get_unaligned_le32(src + 8); + r3 = get_unaligned_le32(src + 12); K(r0, r1, r2, r3, 32); SI7(r0, r1, r2, r3, r4); KL(r1, r3, r0, r4, r2, 31); @@ -562,10 +559,10 @@ void __serpent_decrypt(const void *c, u8 *dst, const u8 *src) SI1(r3, r1, r2, r0, r4); KL(r4, r1, r2, r0, r3, 1); SI0(r4, r1, r2, r0, r3); K(r2, r3, r1, r4, 0); - d[0] = cpu_to_le32(r2); - d[1] = cpu_to_le32(r3); - d[2] = cpu_to_le32(r1); - d[3] = cpu_to_le32(r4); + put_unaligned_le32(r2, dst); + put_unaligned_le32(r3, dst + 4); + put_unaligned_le32(r1, dst + 8); + put_unaligned_le32(r4, dst + 12); } EXPORT_SYMBOL_GPL(__serpent_decrypt); @@ -576,66 +573,13 @@ static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) __serpent_decrypt(ctx, dst, src); } -static int tnepres_setkey(struct crypto_tfm *tfm, const u8 *key, - unsigned int keylen) -{ - u8 rev_key[SERPENT_MAX_KEY_SIZE]; - int i; - - for (i = 0; i < keylen; ++i) - rev_key[keylen - i - 1] = key[i]; - - return serpent_setkey(tfm, rev_key, keylen); -} - -static void tnepres_encrypt(struct crypto_tfm *tfm, 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(tfm, (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(struct crypto_tfm *tfm, 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(tfm, (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 srp_algs[2] = { { +static struct crypto_alg srp_alg = { .cra_name = "serpent", .cra_driver_name = "serpent-generic", .cra_priority = 100, .cra_flags = CRYPTO_ALG_TYPE_CIPHER, .cra_blocksize = SERPENT_BLOCK_SIZE, .cra_ctxsize = sizeof(struct serpent_ctx), - .cra_alignmask = 3, .cra_module = THIS_MODULE, .cra_u = { .cipher = { .cia_min_keysize = SERPENT_MIN_KEY_SIZE, @@ -643,38 +587,23 @@ static struct crypto_alg srp_algs[2] = { { .cia_setkey = serpent_setkey, .cia_encrypt = serpent_encrypt, .cia_decrypt = serpent_decrypt } } -}, { - .cra_name = "tnepres", - .cra_driver_name = "tnepres-generic", - .cra_flags = CRYPTO_ALG_TYPE_CIPHER, - .cra_blocksize = SERPENT_BLOCK_SIZE, - .cra_ctxsize = sizeof(struct serpent_ctx), - .cra_alignmask = 3, - .cra_module = THIS_MODULE, - .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 serpent_mod_init(void) { - return crypto_register_algs(srp_algs, ARRAY_SIZE(srp_algs)); + return crypto_register_alg(&srp_alg); } static void __exit serpent_mod_fini(void) { - crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs)); + crypto_unregister_alg(&srp_alg); } subsys_initcall(serpent_mod_init); module_exit(serpent_mod_fini); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm"); +MODULE_DESCRIPTION("Serpent Cipher Algorithm"); MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>"); -MODULE_ALIAS_CRYPTO("tnepres"); MODULE_ALIAS_CRYPTO("serpent"); MODULE_ALIAS_CRYPTO("serpent-generic"); |