blob: 492c1d0bfe068e3226320a5663a75a087af58490 [file] [log] [blame]
 // SPDX-License-Identifier: GPL-2.0-or-later /* * Cryptographic API. * * Serpent Cipher Algorithm. * * Copyright (C) 2002 Dag Arne Osvik * 2003 Herbert Valerio Riedel * * Added tnepres support: * Ruben Jesus Garcia Hernandez , 18.10.2004 * Based on code by hvr */ #include #include #include #include #include #include #include /* Key is padded to the maximum of 256 bits before round key generation. * Any key length <= 256 bits (32 bytes) is allowed by the algorithm. */ #define PHI 0x9e3779b9UL #define keyiter(a, b, c, d, i, j) \ ({ b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b, 11); k[j] = b; }) #define loadkeys(x0, x1, x2, x3, i) \ ({ x0 = k[i]; x1 = k[i+1]; x2 = k[i+2]; x3 = k[i+3]; }) #define storekeys(x0, x1, x2, x3, i) \ ({ k[i] = x0; k[i+1] = x1; k[i+2] = x2; k[i+3] = x3; }) #define store_and_load_keys(x0, x1, x2, x3, s, l) \ ({ storekeys(x0, x1, x2, x3, s); loadkeys(x0, x1, x2, x3, l); }) #define K(x0, x1, x2, x3, i) ({ \ x3 ^= k[4*(i)+3]; x2 ^= k[4*(i)+2]; \ x1 ^= k[4*(i)+1]; x0 ^= k[4*(i)+0]; \ }) #define LK(x0, x1, x2, x3, x4, i) ({ \ x0 = rol32(x0, 13);\ x2 = rol32(x2, 3); x1 ^= x0; x4 = x0 << 3; \ x3 ^= x2; x1 ^= x2; \ x1 = rol32(x1, 1); x3 ^= x4; \ x3 = rol32(x3, 7); x4 = x1; \ x0 ^= x1; x4 <<= 7; x2 ^= x3; \ x0 ^= x3; x2 ^= x4; x3 ^= k[4*i+3]; \ x1 ^= k[4*i+1]; x0 = rol32(x0, 5); x2 = rol32(x2, 22);\ x0 ^= k[4*i+0]; x2 ^= k[4*i+2]; \ }) #define KL(x0, x1, x2, x3, x4, i) ({ \ x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \ x3 ^= k[4*i+3]; x0 = ror32(x0, 5); x2 = ror32(x2, 22);\ x4 = x1; x2 ^= x3; x0 ^= x3; \ x4 <<= 7; x0 ^= x1; x1 = ror32(x1, 1); \ x2 ^= x4; x3 = ror32(x3, 7); x4 = x0 << 3; \ x1 ^= x0; x3 ^= x4; x0 = ror32(x0, 13);\ x1 ^= x2; x3 ^= x2; x2 = ror32(x2, 3); \ }) #define S0(x0, x1, x2, x3, x4) ({ \ x4 = x3; \ x3 |= x0; x0 ^= x4; x4 ^= x2; \ x4 = ~x4; x3 ^= x1; x1 &= x0; \ x1 ^= x4; x2 ^= x0; x0 ^= x3; \ x4 |= x0; x0 ^= x2; x2 &= x1; \ x3 ^= x2; x1 = ~x1; x2 ^= x4; \ x1 ^= x2; \ }) #define S1(x0, x1, x2, x3, x4) ({ \ x4 = x1; \ x1 ^= x0; x0 ^= x3; x3 = ~x3; \ x4 &= x1; x0 |= x1; x3 ^= x2; \ x0 ^= x3; x1 ^= x3; x3 ^= x4; \ x1 |= x4; x4 ^= x2; x2 &= x0; \ x2 ^= x1; x1 |= x0; x0 = ~x0; \ x0 ^= x2; x4 ^= x1; \ }) #define S2(x0, x1, x2, x3, x4) ({ \ x3 = ~x3; \ x1 ^= x0; x4 = x0; x0 &= x2; \ x0 ^= x3; x3 |= x4; x2 ^= x1; \ x3 ^= x1; x1 &= x0; x0 ^= x2; \ x2 &= x3; x3 |= x1; x0 = ~x0; \ x3 ^= x0; x4 ^= x0; x0 ^= x2; \ x1 |= x2; \ }) #define S3(x0, x1, x2, x3, x4) ({ \ x4 = x1; \ x1 ^= x3; x3 |= x0; x4 &= x0; \ x0 ^= x2; x2 ^= x1; x1 &= x3; \ x2 ^= x3; x0 |= x4; x4 ^= x3; \ x1 ^= x0; x0 &= x3; x3 &= x4; \ x3 ^= x2; x4 |= x1; x2 &= x1; \ x4 ^= x3; x0 ^= x3; x3 ^= x2; \ }) #define S4(x0, x1, x2, x3, x4) ({ \ x4 = x3; \ x3 &= x0; x0 ^= x4; \ x3 ^= x2; x2 |= x4; x0 ^= x1; \ x4 ^= x3; x2 |= x0; \ x2 ^= x1; x1 &= x0; \ x1 ^= x4; x4 &= x2; x2 ^= x3; \ x4 ^= x0; x3 |= x1; x1 = ~x1; \ x3 ^= x0; \ }) #define S5(x0, x1, x2, x3, x4) ({ \ x4 = x1; x1 |= x0; \ x2 ^= x1; x3 = ~x3; x4 ^= x0; \ x0 ^= x2; x1 &= x4; x4 |= x3; \ x4 ^= x0; x0 &= x3; x1 ^= x3; \ x3 ^= x2; x0 ^= x1; x2 &= x4; \ x1 ^= x2; x2 &= x0; \ x3 ^= x2; \ }) #define S6(x0, x1, x2, x3, x4) ({ \ x4 = x1; \ x3 ^= x0; x1 ^= x2; x2 ^= x0; \ x0 &= x3; x1 |= x3; x4 = ~x4; \ x0 ^= x1; x1 ^= x2; \ x3 ^= x4; x4 ^= x0; x2 &= x0; \ x4 ^= x1; x2 ^= x3; x3 &= x1; \ x3 ^= x0; x1 ^= x2; \ }) #define S7(x0, x1, x2, x3, x4) ({ \ x1 = ~x1; \ x4 = x1; x0 = ~x0; x1 &= x2; \ x1 ^= x3; x3 |= x4; x4 ^= x2; \ x2 ^= x3; x3 ^= x0; x0 |= x1; \ x2 &= x0; x0 ^= x4; x4 ^= x3; \ x3 &= x0; x4 ^= x1; \ x2 ^= x4; x3 ^= x1; x4 |= x0; \ x4 ^= x1; \ }) #define SI0(x0, x1, x2, x3, x4) ({ \ x4 = x3; x1 ^= x0; \ x3 |= x1; x4 ^= x1; x0 = ~x0; \ x2 ^= x3; x3 ^= x0; x0 &= x1; \ x0 ^= x2; x2 &= x3; x3 ^= x4; \ x2 ^= x3; x1 ^= x3; x3 &= x0; \ x1 ^= x0; x0 ^= x2; x4 ^= x3; \ }) #define SI1(x0, x1, x2, x3, x4) ({ \ x1 ^= x3; x4 = x0; \ x0 ^= x2; x2 = ~x2; x4 |= x1; \ x4 ^= x3; x3 &= x1; x1 ^= x2; \ x2 &= x4; x4 ^= x1; x1 |= x3; \ x3 ^= x0; x2 ^= x0; x0 |= x4; \ x2 ^= x4; x1 ^= x0; \ x4 ^= x1; \ }) #define SI2(x0, x1, x2, x3, x4) ({ \ x2 ^= x1; x4 = x3; x3 = ~x3; \ x3 |= x2; x2 ^= x4; x4 ^= x0; \ x3 ^= x1; x1 |= x2; x2 ^= x0; \ x1 ^= x4; x4 |= x3; x2 ^= x3; \ x4 ^= x2; x2 &= x1; \ x2 ^= x3; x3 ^= x4; x4 ^= x0; \ }) #define SI3(x0, x1, x2, x3, x4) ({ \ x2 ^= x1; \ x4 = x1; x1 &= x2; \ x1 ^= x0; x0 |= x4; x4 ^= x3; \ x0 ^= x3; x3 |= x1; x1 ^= x2; \ x1 ^= x3; x0 ^= x2; x2 ^= x3; \ x3 &= x1; x1 ^= x0; x0 &= x2; \ x4 ^= x3; x3 ^= x0; x0 ^= x1; \ }) #define SI4(x0, x1, x2, x3, x4) ({ \ x2 ^= x3; x4 = x0; x0 &= x1; \ x0 ^= x2; x2 |= x3; x4 = ~x4; \ x1 ^= x0; x0 ^= x2; x2 &= x4; \ x2 ^= x0; x0 |= x4; \ x0 ^= x3; x3 &= x2; \ x4 ^= x3; x3 ^= x1; x1 &= x0; \ x4 ^= x1; x0 ^= x3; \ }) #define SI5(x0, x1, x2, x3, x4) ({ \ x4 = x1; x1 |= x2; \ x2 ^= x4; x1 ^= x3; x3 &= x4; \ x2 ^= x3; x3 |= x0; x0 = ~x0; \ x3 ^= x2; x2 |= x0; x4 ^= x1; \ x2 ^= x4; x4 &= x0; x0 ^= x1; \ x1 ^= x3; x0 &= x2; x2 ^= x3; \ x0 ^= x2; x2 ^= x4; x4 ^= x3; \ }) #define SI6(x0, x1, x2, x3, x4) ({ \ x0 ^= x2; \ x4 = x0; x0 &= x3; x2 ^= x3; \ x0 ^= x2; x3 ^= x1; x2 |= x4; \ x2 ^= x3; x3 &= x0; x0 = ~x0; \ x3 ^= x1; x1 &= x2; x4 ^= x0; \ x3 ^= x4; x4 ^= x2; x0 ^= x1; \ x2 ^= x0; \ }) #define SI7(x0, x1, x2, x3, x4) ({ \ x4 = x3; x3 &= x0; x0 ^= x2; \ x2 |= x4; x4 ^= x1; x0 = ~x0; \ x1 |= x3; x4 ^= x0; x0 &= x2; \ x0 ^= x1; x1 &= x2; x3 ^= x2; \ x4 ^= x3; x2 &= x3; x3 |= x0; \ x1 ^= x4; x3 ^= x4; x4 &= x0; \ x4 ^= x2; \ }) /* * both gcc and clang have misoptimized this function in the past, * producing horrible object code from spilling temporary variables * on the stack. Forcing this part out of line avoids that. */ static noinline void __serpent_setkey_sbox(u32 r0, u32 r1, u32 r2, u32 r3, u32 r4, u32 *k) { k += 100; S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24); S4(r1, r2, r4, r3, r0); store_and_load_keys(r2, r4, r3, r0, 24, 20); S5(r2, r4, r3, r0, r1); store_and_load_keys(r1, r2, r4, r0, 20, 16); S6(r1, r2, r4, r0, r3); store_and_load_keys(r4, r3, r2, r0, 16, 12); S7(r4, r3, r2, r0, r1); store_and_load_keys(r1, r2, r0, r4, 12, 8); S0(r1, r2, r0, r4, r3); store_and_load_keys(r0, r2, r4, r1, 8, 4); S1(r0, r2, r4, r1, r3); store_and_load_keys(r3, r4, r1, r0, 4, 0); S2(r3, r4, r1, r0, r2); store_and_load_keys(r2, r4, r3, r0, 0, -4); S3(r2, r4, r3, r0, r1); store_and_load_keys(r0, r1, r4, r2, -4, -8); S4(r0, r1, r4, r2, r3); store_and_load_keys(r1, r4, r2, r3, -8, -12); S5(r1, r4, r2, r3, r0); store_and_load_keys(r0, r1, r4, r3, -12, -16); S6(r0, r1, r4, r3, r2); store_and_load_keys(r4, r2, r1, r3, -16, -20); S7(r4, r2, r1, r3, r0); store_and_load_keys(r0, r1, r3, r4, -20, -24); S0(r0, r1, r3, r4, r2); store_and_load_keys(r3, r1, r4, r0, -24, -28); k -= 50; S1(r3, r1, r4, r0, r2); store_and_load_keys(r2, r4, r0, r3, 22, 18); S2(r2, r4, r0, r3, r1); store_and_load_keys(r1, r4, r2, r3, 18, 14); S3(r1, r4, r2, r3, r0); store_and_load_keys(r3, r0, r4, r1, 14, 10); S4(r3, r0, r4, r1, r2); store_and_load_keys(r0, r4, r1, r2, 10, 6); S5(r0, r4, r1, r2, r3); store_and_load_keys(r3, r0, r4, r2, 6, 2); S6(r3, r0, r4, r2, r1); store_and_load_keys(r4, r1, r0, r2, 2, -2); S7(r4, r1, r0, r2, r3); store_and_load_keys(r3, r0, r2, r4, -2, -6); S0(r3, r0, r2, r4, r1); store_and_load_keys(r2, r0, r4, r3, -6, -10); S1(r2, r0, r4, r3, r1); store_and_load_keys(r1, r4, r3, r2, -10, -14); S2(r1, r4, r3, r2, r0); store_and_load_keys(r0, r4, r1, r2, -14, -18); S3(r0, r4, r1, r2, r3); store_and_load_keys(r2, r3, r4, r0, -18, -22); k -= 50; S4(r2, r3, r4, r0, r1); store_and_load_keys(r3, r4, r0, r1, 28, 24); S5(r3, r4, r0, r1, r2); store_and_load_keys(r2, r3, r4, r1, 24, 20); S6(r2, r3, r4, r1, r0); store_and_load_keys(r4, r0, r3, r1, 20, 16); S7(r4, r0, r3, r1, r2); store_and_load_keys(r2, r3, r1, r4, 16, 12); S0(r2, r3, r1, r4, r0); store_and_load_keys(r1, r3, r4, r2, 12, 8); S1(r1, r3, r4, r2, r0); store_and_load_keys(r0, r4, r2, r1, 8, 4); S2(r0, r4, r2, r1, r3); store_and_load_keys(r3, r4, r0, r1, 4, 0); S3(r3, r4, r0, r1, r2); storekeys(r1, r2, r4, r3, 0); } int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key, unsigned int keylen) { u32 *k = ctx->expkey; u8 *k8 = (u8 *)k; u32 r0, r1, r2, r3, r4; int i; /* Copy key, add padding */ for (i = 0; i < keylen; ++i) k8[i] = key[i]; if (i < SERPENT_MAX_KEY_SIZE) k8[i++] = 1; while (i < SERPENT_MAX_KEY_SIZE) k8[i++] = 0; /* 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); keyiter(k[0], r3, r2, r0, 8, 8); keyiter(k[1], r4, r3, r1, 9, 9); keyiter(k[2], r0, r4, r2, 10, 10); keyiter(k[3], r1, r0, r3, 11, 11); keyiter(k[4], r2, r1, r4, 12, 12); keyiter(k[5], r3, r2, r0, 13, 13); keyiter(k[6], r4, r3, r1, 14, 14); keyiter(k[7], r0, r4, r2, 15, 15); keyiter(k[8], r1, r0, r3, 16, 16); keyiter(k[9], r2, r1, r4, 17, 17); keyiter(k[10], r3, r2, r0, 18, 18); keyiter(k[11], r4, r3, r1, 19, 19); keyiter(k[12], r0, r4, r2, 20, 20); keyiter(k[13], r1, r0, r3, 21, 21); keyiter(k[14], r2, r1, r4, 22, 22); keyiter(k[15], r3, r2, r0, 23, 23); keyiter(k[16], r4, r3, r1, 24, 24); keyiter(k[17], r0, r4, r2, 25, 25); keyiter(k[18], r1, r0, r3, 26, 26); keyiter(k[19], r2, r1, r4, 27, 27); keyiter(k[20], r3, r2, r0, 28, 28); keyiter(k[21], r4, r3, r1, 29, 29); keyiter(k[22], r0, r4, r2, 30, 30); keyiter(k[23], r1, r0, r3, 31, 31); k += 50; keyiter(k[-26], r2, r1, r4, 32, -18); keyiter(k[-25], r3, r2, r0, 33, -17); keyiter(k[-24], r4, r3, r1, 34, -16); keyiter(k[-23], r0, r4, r2, 35, -15); keyiter(k[-22], r1, r0, r3, 36, -14); keyiter(k[-21], r2, r1, r4, 37, -13); keyiter(k[-20], r3, r2, r0, 38, -12); keyiter(k[-19], r4, r3, r1, 39, -11); keyiter(k[-18], r0, r4, r2, 40, -10); keyiter(k[-17], r1, r0, r3, 41, -9); keyiter(k[-16], r2, r1, r4, 42, -8); keyiter(k[-15], r3, r2, r0, 43, -7); keyiter(k[-14], r4, r3, r1, 44, -6); keyiter(k[-13], r0, r4, r2, 45, -5); keyiter(k[-12], r1, r0, r3, 46, -4); keyiter(k[-11], r2, r1, r4, 47, -3); keyiter(k[-10], r3, r2, r0, 48, -2); keyiter(k[-9], r4, r3, r1, 49, -1); keyiter(k[-8], r0, r4, r2, 50, 0); keyiter(k[-7], r1, r0, r3, 51, 1); keyiter(k[-6], r2, r1, r4, 52, 2); keyiter(k[-5], r3, r2, r0, 53, 3); keyiter(k[-4], r4, r3, r1, 54, 4); keyiter(k[-3], r0, r4, r2, 55, 5); keyiter(k[-2], r1, r0, r3, 56, 6); keyiter(k[-1], r2, r1, r4, 57, 7); keyiter(k[0], r3, r2, r0, 58, 8); keyiter(k[1], r4, r3, r1, 59, 9); keyiter(k[2], r0, r4, r2, 60, 10); keyiter(k[3], r1, r0, r3, 61, 11); keyiter(k[4], r2, r1, r4, 62, 12); keyiter(k[5], r3, r2, r0, 63, 13); keyiter(k[6], r4, r3, r1, 64, 14); keyiter(k[7], r0, r4, r2, 65, 15); keyiter(k[8], r1, r0, r3, 66, 16); keyiter(k[9], r2, r1, r4, 67, 17); keyiter(k[10], r3, r2, r0, 68, 18); keyiter(k[11], r4, r3, r1, 69, 19); keyiter(k[12], r0, r4, r2, 70, 20); keyiter(k[13], r1, r0, r3, 71, 21); keyiter(k[14], r2, r1, r4, 72, 22); keyiter(k[15], r3, r2, r0, 73, 23); keyiter(k[16], r4, r3, r1, 74, 24); keyiter(k[17], r0, r4, r2, 75, 25); keyiter(k[18], r1, r0, r3, 76, 26); keyiter(k[19], r2, r1, r4, 77, 27); keyiter(k[20], r3, r2, r0, 78, 28); keyiter(k[21], r4, r3, r1, 79, 29); keyiter(k[22], r0, r4, r2, 80, 30); keyiter(k[23], r1, r0, r3, 81, 31); k += 50; keyiter(k[-26], r2, r1, r4, 82, -18); keyiter(k[-25], r3, r2, r0, 83, -17); keyiter(k[-24], r4, r3, r1, 84, -16); keyiter(k[-23], r0, r4, r2, 85, -15); keyiter(k[-22], r1, r0, r3, 86, -14); keyiter(k[-21], r2, r1, r4, 87, -13); keyiter(k[-20], r3, r2, r0, 88, -12); keyiter(k[-19], r4, r3, r1, 89, -11); keyiter(k[-18], r0, r4, r2, 90, -10); keyiter(k[-17], r1, r0, r3, 91, -9); keyiter(k[-16], r2, r1, r4, 92, -8); keyiter(k[-15], r3, r2, r0, 93, -7); keyiter(k[-14], r4, r3, r1, 94, -6); keyiter(k[-13], r0, r4, r2, 95, -5); keyiter(k[-12], r1, r0, r3, 96, -4); keyiter(k[-11], r2, r1, r4, 97, -3); keyiter(k[-10], r3, r2, r0, 98, -2); keyiter(k[-9], r4, r3, r1, 99, -1); keyiter(k[-8], r0, r4, r2, 100, 0); keyiter(k[-7], r1, r0, r3, 101, 1); keyiter(k[-6], r2, r1, r4, 102, 2); keyiter(k[-5], r3, r2, r0, 103, 3); keyiter(k[-4], r4, r3, r1, 104, 4); keyiter(k[-3], r0, r4, r2, 105, 5); keyiter(k[-2], r1, r0, r3, 106, 6); keyiter(k[-1], r2, r1, r4, 107, 7); keyiter(k[0], r3, r2, r0, 108, 8); keyiter(k[1], r4, r3, r1, 109, 9); keyiter(k[2], r0, r4, r2, 110, 10); keyiter(k[3], r1, r0, r3, 111, 11); keyiter(k[4], r2, r1, r4, 112, 12); keyiter(k[5], r3, r2, r0, 113, 13); keyiter(k[6], r4, r3, r1, 114, 14); keyiter(k[7], r0, r4, r2, 115, 15); keyiter(k[8], r1, r0, r3, 116, 16); keyiter(k[9], r2, r1, r4, 117, 17); keyiter(k[10], r3, r2, r0, 118, 18); keyiter(k[11], r4, r3, r1, 119, 19); keyiter(k[12], r0, r4, r2, 120, 20); keyiter(k[13], r1, r0, r3, 121, 21); keyiter(k[14], r2, r1, r4, 122, 22); keyiter(k[15], r3, r2, r0, 123, 23); keyiter(k[16], r4, r3, r1, 124, 24); keyiter(k[17], r0, r4, r2, 125, 25); keyiter(k[18], r1, r0, r3, 126, 26); keyiter(k[19], r2, r1, r4, 127, 27); keyiter(k[20], r3, r2, r0, 128, 28); keyiter(k[21], r4, r3, r1, 129, 29); keyiter(k[22], r0, r4, r2, 130, 30); keyiter(k[23], r1, r0, r3, 131, 31); /* Apply S-boxes */ __serpent_setkey_sbox(r0, r1, r2, r3, r4, ctx->expkey); return 0; } EXPORT_SYMBOL_GPL(__serpent_setkey); int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) { return __serpent_setkey(crypto_tfm_ctx(tfm), key, keylen); } EXPORT_SYMBOL_GPL(serpent_setkey); 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]); K(r0, r1, r2, r3, 0); S0(r0, r1, r2, r3, r4); LK(r2, r1, r3, r0, r4, 1); S1(r2, r1, r3, r0, r4); LK(r4, r3, r0, r2, r1, 2); S2(r4, r3, r0, r2, r1); LK(r1, r3, r4, r2, r0, 3); S3(r1, r3, r4, r2, r0); LK(r2, r0, r3, r1, r4, 4); S4(r2, r0, r3, r1, r4); LK(r0, r3, r1, r4, r2, 5); S5(r0, r3, r1, r4, r2); LK(r2, r0, r3, r4, r1, 6); S6(r2, r0, r3, r4, r1); LK(r3, r1, r0, r4, r2, 7); S7(r3, r1, r0, r4, r2); LK(r2, r0, r4, r3, r1, 8); S0(r2, r0, r4, r3, r1); LK(r4, r0, r3, r2, r1, 9); S1(r4, r0, r3, r2, r1); LK(r1, r3, r2, r4, r0, 10); S2(r1, r3, r2, r4, r0); LK(r0, r3, r1, r4, r2, 11); S3(r0, r3, r1, r4, r2); LK(r4, r2, r3, r0, r1, 12); S4(r4, r2, r3, r0, r1); LK(r2, r3, r0, r1, r4, 13); S5(r2, r3, r0, r1, r4); LK(r4, r2, r3, r1, r0, 14); S6(r4, r2, r3, r1, r0); LK(r3, r0, r2, r1, r4, 15); S7(r3, r0, r2, r1, r4); LK(r4, r2, r1, r3, r0, 16); S0(r4, r2, r1, r3, r0); LK(r1, r2, r3, r4, r0, 17); S1(r1, r2, r3, r4, r0); LK(r0, r3, r4, r1, r2, 18); S2(r0, r3, r4, r1, r2); LK(r2, r3, r0, r1, r4, 19); S3(r2, r3, r0, r1, r4); LK(r1, r4, r3, r2, r0, 20); S4(r1, r4, r3, r2, r0); LK(r4, r3, r2, r0, r1, 21); S5(r4, r3, r2, r0, r1); LK(r1, r4, r3, r0, r2, 22); S6(r1, r4, r3, r0, r2); LK(r3, r2, r4, r0, r1, 23); S7(r3, r2, r4, r0, r1); LK(r1, r4, r0, r3, r2, 24); S0(r1, r4, r0, r3, r2); LK(r0, r4, r3, r1, r2, 25); S1(r0, r4, r3, r1, r2); LK(r2, r3, r1, r0, r4, 26); S2(r2, r3, r1, r0, r4); LK(r4, r3, r2, r0, r1, 27); S3(r4, r3, r2, r0, r1); LK(r0, r1, r3, r4, r2, 28); S4(r0, r1, r3, r4, r2); LK(r1, r3, r4, r2, r0, 29); S5(r1, r3, r4, r2, r0); LK(r0, r1, r3, r2, r4, 30); 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); } EXPORT_SYMBOL_GPL(__serpent_encrypt); static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { struct serpent_ctx *ctx = crypto_tfm_ctx(tfm); __serpent_encrypt(ctx, dst, src); } 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]); K(r0, r1, r2, r3, 32); SI7(r0, r1, r2, r3, r4); KL(r1, r3, r0, r4, r2, 31); SI6(r1, r3, r0, r4, r2); KL(r0, r2, r4, r1, r3, 30); SI5(r0, r2, r4, r1, r3); KL(r2, r3, r0, r4, r1, 29); SI4(r2, r3, r0, r4, r1); KL(r2, r0, r1, r4, r3, 28); SI3(r2, r0, r1, r4, r3); KL(r1, r2, r3, r4, r0, 27); SI2(r1, r2, r3, r4, r0); KL(r2, r0, r4, r3, r1, 26); SI1(r2, r0, r4, r3, r1); KL(r1, r0, r4, r3, r2, 25); SI0(r1, r0, r4, r3, r2); KL(r4, r2, r0, r1, r3, 24); SI7(r4, r2, r0, r1, r3); KL(r2, r1, r4, r3, r0, 23); SI6(r2, r1, r4, r3, r0); KL(r4, r0, r3, r2, r1, 22); SI5(r4, r0, r3, r2, r1); KL(r0, r1, r4, r3, r2, 21); SI4(r0, r1, r4, r3, r2); KL(r0, r4, r2, r3, r1, 20); SI3(r0, r4, r2, r3, r1); KL(r2, r0, r1, r3, r4, 19); SI2(r2, r0, r1, r3, r4); KL(r0, r4, r3, r1, r2, 18); SI1(r0, r4, r3, r1, r2); KL(r2, r4, r3, r1, r0, 17); SI0(r2, r4, r3, r1, r0); KL(r3, r0, r4, r2, r1, 16); SI7(r3, r0, r4, r2, r1); KL(r0, r2, r3, r1, r4, 15); SI6(r0, r2, r3, r1, r4); KL(r3, r4, r1, r0, r2, 14); SI5(r3, r4, r1, r0, r2); KL(r4, r2, r3, r1, r0, 13); SI4(r4, r2, r3, r1, r0); KL(r4, r3, r0, r1, r2, 12); SI3(r4, r3, r0, r1, r2); KL(r0, r4, r2, r1, r3, 11); SI2(r0, r4, r2, r1, r3); KL(r4, r3, r1, r2, r0, 10); SI1(r4, r3, r1, r2, r0); KL(r0, r3, r1, r2, r4, 9); SI0(r0, r3, r1, r2, r4); KL(r1, r4, r3, r0, r2, 8); SI7(r1, r4, r3, r0, r2); KL(r4, r0, r1, r2, r3, 7); SI6(r4, r0, r1, r2, r3); KL(r1, r3, r2, r4, r0, 6); SI5(r1, r3, r2, r4, r0); KL(r3, r0, r1, r2, r4, 5); SI4(r3, r0, r1, r2, r4); KL(r3, r1, r4, r2, r0, 4); SI3(r3, r1, r4, r2, r0); KL(r4, r3, r0, r2, r1, 3); SI2(r4, r3, r0, r2, r1); KL(r3, r1, r2, r0, r4, 2); 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); } EXPORT_SYMBOL_GPL(__serpent_decrypt); static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) { struct serpent_ctx *ctx = crypto_tfm_ctx(tfm); __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] = { { .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, .cia_max_keysize = SERPENT_MAX_KEY_SIZE, .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)); } static void __exit serpent_mod_fini(void) { crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs)); } 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_AUTHOR("Dag Arne Osvik "); MODULE_ALIAS_CRYPTO("tnepres"); MODULE_ALIAS_CRYPTO("serpent"); MODULE_ALIAS_CRYPTO("serpent-generic");