From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:51 +0200 Subject: Adding upstream version 2.06. Signed-off-by: Daniel Baumann --- grub-core/lib/libgcrypt-grub/cipher/serpent.c | 903 ++++++++++++++++++++++++++ 1 file changed, 903 insertions(+) create mode 100644 grub-core/lib/libgcrypt-grub/cipher/serpent.c (limited to 'grub-core/lib/libgcrypt-grub/cipher/serpent.c') diff --git a/grub-core/lib/libgcrypt-grub/cipher/serpent.c b/grub-core/lib/libgcrypt-grub/cipher/serpent.c new file mode 100644 index 0000000..75be7b8 --- /dev/null +++ b/grub-core/lib/libgcrypt-grub/cipher/serpent.c @@ -0,0 +1,903 @@ +/* This file was automatically imported with + import_gcry.py. Please don't modify it */ +#include +GRUB_MOD_LICENSE ("GPLv3+"); +/* serpent.c - Implementation of the Serpent encryption algorithm. + * Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. + * + * This file is part of Libgcrypt. + * + * Libgcrypt is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser general Public License as + * published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * Libgcrypt is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + * 02111-1307, USA. + */ + + + +#include "types.h" +#include "g10lib.h" +#include "cipher.h" +#include "bithelp.h" + +/* Number of rounds per Serpent encrypt/decrypt operation. */ +#define ROUNDS 32 + +/* Magic number, used during generating of the subkeys. */ +#define PHI 0x9E3779B9 + +/* Serpent works on 128 bit blocks. */ +typedef u32 serpent_block_t[4]; + +/* Serpent key, provided by the user. If the original key is shorter + than 256 bits, it is padded. */ +typedef u32 serpent_key_t[8]; + +/* The key schedule consists of 33 128 bit subkeys. */ +typedef u32 serpent_subkeys_t[ROUNDS + 1][4]; + +/* A Serpent context. */ +typedef struct serpent_context +{ + serpent_subkeys_t keys; /* Generated subkeys. */ +} serpent_context_t; + + +/* A prototype. */ +static const char *serpent_test (void); + + +#define byte_swap_32(x) \ + (0 \ + | (((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) \ + | (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24)) + +/* These are the S-Boxes of Serpent. They are copied from Serpents + reference implementation (the optimized one, contained in + `floppy2') and are therefore: + + Copyright (C) 1998 Ross Anderson, Eli Biham, Lars Knudsen. + + To quote the Serpent homepage + (http://www.cl.cam.ac.uk/~rja14/serpent.html): + + "Serpent is now completely in the public domain, and we impose no + restrictions on its use. This was announced on the 21st August at + the First AES Candidate Conference. The optimised implementations + in the submission package are now under the GNU PUBLIC LICENSE + (GPL), although some comments in the code still say otherwise. You + are welcome to use Serpent for any application." */ + +#define SBOX0(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t05, t06, t07, t08, t09; \ + u32 t11, t12, t13, t14, t15, t17, t01; \ + t01 = b ^ c ; \ + t02 = a | d ; \ + t03 = a ^ b ; \ + z = t02 ^ t01; \ + t05 = c | z ; \ + t06 = a ^ d ; \ + t07 = b | c ; \ + t08 = d & t05; \ + t09 = t03 & t07; \ + y = t09 ^ t08; \ + t11 = t09 & y ; \ + t12 = c ^ d ; \ + t13 = t07 ^ t11; \ + t14 = b & t06; \ + t15 = t06 ^ t13; \ + w = ~ t15; \ + t17 = w ^ t14; \ + x = t12 ^ t17; \ + } + +#define SBOX0_INVERSE(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t08, t09, t10; \ + u32 t12, t13, t14, t15, t17, t18, t01; \ + t01 = c ^ d ; \ + t02 = a | b ; \ + t03 = b | c ; \ + t04 = c & t01; \ + t05 = t02 ^ t01; \ + t06 = a | t04; \ + y = ~ t05; \ + t08 = b ^ d ; \ + t09 = t03 & t08; \ + t10 = d | y ; \ + x = t09 ^ t06; \ + t12 = a | t05; \ + t13 = x ^ t12; \ + t14 = t03 ^ t10; \ + t15 = a ^ c ; \ + z = t14 ^ t13; \ + t17 = t05 & t13; \ + t18 = t14 | t17; \ + w = t15 ^ t18; \ + } + +#define SBOX1(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t07, t08; \ + u32 t10, t11, t12, t13, t16, t17, t01; \ + t01 = a | d ; \ + t02 = c ^ d ; \ + t03 = ~ b ; \ + t04 = a ^ c ; \ + t05 = a | t03; \ + t06 = d & t04; \ + t07 = t01 & t02; \ + t08 = b | t06; \ + y = t02 ^ t05; \ + t10 = t07 ^ t08; \ + t11 = t01 ^ t10; \ + t12 = y ^ t11; \ + t13 = b & d ; \ + z = ~ t10; \ + x = t13 ^ t12; \ + t16 = t10 | x ; \ + t17 = t05 & t16; \ + w = c ^ t17; \ + } + +#define SBOX1_INVERSE(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t07, t08; \ + u32 t09, t10, t11, t14, t15, t17, t01; \ + t01 = a ^ b ; \ + t02 = b | d ; \ + t03 = a & c ; \ + t04 = c ^ t02; \ + t05 = a | t04; \ + t06 = t01 & t05; \ + t07 = d | t03; \ + t08 = b ^ t06; \ + t09 = t07 ^ t06; \ + t10 = t04 | t03; \ + t11 = d & t08; \ + y = ~ t09; \ + x = t10 ^ t11; \ + t14 = a | y ; \ + t15 = t06 ^ x ; \ + z = t01 ^ t04; \ + t17 = c ^ t15; \ + w = t14 ^ t17; \ + } + +#define SBOX2(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t05, t06, t07, t08; \ + u32 t09, t10, t12, t13, t14, t01; \ + t01 = a | c ; \ + t02 = a ^ b ; \ + t03 = d ^ t01; \ + w = t02 ^ t03; \ + t05 = c ^ w ; \ + t06 = b ^ t05; \ + t07 = b | t05; \ + t08 = t01 & t06; \ + t09 = t03 ^ t07; \ + t10 = t02 | t09; \ + x = t10 ^ t08; \ + t12 = a | d ; \ + t13 = t09 ^ x ; \ + t14 = b ^ t13; \ + z = ~ t09; \ + y = t12 ^ t14; \ + } + +#define SBOX2_INVERSE(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t06, t07, t08, t09; \ + u32 t10, t11, t12, t15, t16, t17, t01; \ + t01 = a ^ d ; \ + t02 = c ^ d ; \ + t03 = a & c ; \ + t04 = b | t02; \ + w = t01 ^ t04; \ + t06 = a | c ; \ + t07 = d | w ; \ + t08 = ~ d ; \ + t09 = b & t06; \ + t10 = t08 | t03; \ + t11 = b & t07; \ + t12 = t06 & t02; \ + z = t09 ^ t10; \ + x = t12 ^ t11; \ + t15 = c & z ; \ + t16 = w ^ x ; \ + t17 = t10 ^ t15; \ + y = t16 ^ t17; \ + } + +#define SBOX3(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t07, t08; \ + u32 t09, t10, t11, t13, t14, t15, t01; \ + t01 = a ^ c ; \ + t02 = a | d ; \ + t03 = a & d ; \ + t04 = t01 & t02; \ + t05 = b | t03; \ + t06 = a & b ; \ + t07 = d ^ t04; \ + t08 = c | t06; \ + t09 = b ^ t07; \ + t10 = d & t05; \ + t11 = t02 ^ t10; \ + z = t08 ^ t09; \ + t13 = d | z ; \ + t14 = a | t07; \ + t15 = b & t13; \ + y = t08 ^ t11; \ + w = t14 ^ t15; \ + x = t05 ^ t04; \ + } + +#define SBOX3_INVERSE(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t07, t09; \ + u32 t11, t12, t13, t14, t16, t01; \ + t01 = c | d ; \ + t02 = a | d ; \ + t03 = c ^ t02; \ + t04 = b ^ t02; \ + t05 = a ^ d ; \ + t06 = t04 & t03; \ + t07 = b & t01; \ + y = t05 ^ t06; \ + t09 = a ^ t03; \ + w = t07 ^ t03; \ + t11 = w | t05; \ + t12 = t09 & t11; \ + t13 = a & y ; \ + t14 = t01 ^ t05; \ + x = b ^ t12; \ + t16 = b | t13; \ + z = t14 ^ t16; \ + } + +#define SBOX4(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t08, t09; \ + u32 t10, t11, t12, t13, t14, t15, t16, t01; \ + t01 = a | b ; \ + t02 = b | c ; \ + t03 = a ^ t02; \ + t04 = b ^ d ; \ + t05 = d | t03; \ + t06 = d & t01; \ + z = t03 ^ t06; \ + t08 = z & t04; \ + t09 = t04 & t05; \ + t10 = c ^ t06; \ + t11 = b & c ; \ + t12 = t04 ^ t08; \ + t13 = t11 | t03; \ + t14 = t10 ^ t09; \ + t15 = a & t05; \ + t16 = t11 | t12; \ + y = t13 ^ t08; \ + x = t15 ^ t16; \ + w = ~ t14; \ + } + +#define SBOX4_INVERSE(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t07, t09; \ + u32 t10, t11, t12, t13, t15, t01; \ + t01 = b | d ; \ + t02 = c | d ; \ + t03 = a & t01; \ + t04 = b ^ t02; \ + t05 = c ^ d ; \ + t06 = ~ t03; \ + t07 = a & t04; \ + x = t05 ^ t07; \ + t09 = x | t06; \ + t10 = a ^ t07; \ + t11 = t01 ^ t09; \ + t12 = d ^ t04; \ + t13 = c | t10; \ + z = t03 ^ t12; \ + t15 = a ^ t04; \ + y = t11 ^ t13; \ + w = t15 ^ t09; \ + } + +#define SBOX5(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t07, t08, t09; \ + u32 t10, t11, t12, t13, t14, t01; \ + t01 = b ^ d ; \ + t02 = b | d ; \ + t03 = a & t01; \ + t04 = c ^ t02; \ + t05 = t03 ^ t04; \ + w = ~ t05; \ + t07 = a ^ t01; \ + t08 = d | w ; \ + t09 = b | t05; \ + t10 = d ^ t08; \ + t11 = b | t07; \ + t12 = t03 | w ; \ + t13 = t07 | t10; \ + t14 = t01 ^ t11; \ + y = t09 ^ t13; \ + x = t07 ^ t08; \ + z = t12 ^ t14; \ + } + +#define SBOX5_INVERSE(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t07, t08, t09; \ + u32 t10, t12, t13, t15, t16, t01; \ + t01 = a & d ; \ + t02 = c ^ t01; \ + t03 = a ^ d ; \ + t04 = b & t02; \ + t05 = a & c ; \ + w = t03 ^ t04; \ + t07 = a & w ; \ + t08 = t01 ^ w ; \ + t09 = b | t05; \ + t10 = ~ b ; \ + x = t08 ^ t09; \ + t12 = t10 | t07; \ + t13 = w | x ; \ + z = t02 ^ t12; \ + t15 = t02 ^ t13; \ + t16 = b ^ d ; \ + y = t16 ^ t15; \ + } + +#define SBOX6(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t07, t08, t09, t10; \ + u32 t11, t12, t13, t15, t17, t18, t01; \ + t01 = a & d ; \ + t02 = b ^ c ; \ + t03 = a ^ d ; \ + t04 = t01 ^ t02; \ + t05 = b | c ; \ + x = ~ t04; \ + t07 = t03 & t05; \ + t08 = b & x ; \ + t09 = a | c ; \ + t10 = t07 ^ t08; \ + t11 = b | d ; \ + t12 = c ^ t11; \ + t13 = t09 ^ t10; \ + y = ~ t13; \ + t15 = x & t03; \ + z = t12 ^ t07; \ + t17 = a ^ b ; \ + t18 = y ^ t15; \ + w = t17 ^ t18; \ + } + +#define SBOX6_INVERSE(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t07, t08, t09; \ + u32 t12, t13, t14, t15, t16, t17, t01; \ + t01 = a ^ c ; \ + t02 = ~ c ; \ + t03 = b & t01; \ + t04 = b | t02; \ + t05 = d | t03; \ + t06 = b ^ d ; \ + t07 = a & t04; \ + t08 = a | t02; \ + t09 = t07 ^ t05; \ + x = t06 ^ t08; \ + w = ~ t09; \ + t12 = b & w ; \ + t13 = t01 & t05; \ + t14 = t01 ^ t12; \ + t15 = t07 ^ t13; \ + t16 = d | t02; \ + t17 = a ^ x ; \ + z = t17 ^ t15; \ + y = t16 ^ t14; \ + } + +#define SBOX7(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t05, t06, t08, t09, t10; \ + u32 t11, t13, t14, t15, t16, t17, t01; \ + t01 = a & c ; \ + t02 = ~ d ; \ + t03 = a & t02; \ + t04 = b | t01; \ + t05 = a & b ; \ + t06 = c ^ t04; \ + z = t03 ^ t06; \ + t08 = c | z ; \ + t09 = d | t05; \ + t10 = a ^ t08; \ + t11 = t04 & z ; \ + x = t09 ^ t10; \ + t13 = b ^ x ; \ + t14 = t01 ^ x ; \ + t15 = c ^ t05; \ + t16 = t11 | t13; \ + t17 = t02 | t14; \ + w = t15 ^ t17; \ + y = a ^ t16; \ + } + +#define SBOX7_INVERSE(a, b, c, d, w, x, y, z) \ + { \ + u32 t02, t03, t04, t06, t07, t08, t09; \ + u32 t10, t11, t13, t14, t15, t16, t01; \ + t01 = a & b ; \ + t02 = a | b ; \ + t03 = c | t01; \ + t04 = d & t02; \ + z = t03 ^ t04; \ + t06 = b ^ t04; \ + t07 = d ^ z ; \ + t08 = ~ t07; \ + t09 = t06 | t08; \ + t10 = b ^ d ; \ + t11 = a | d ; \ + x = a ^ t09; \ + t13 = c ^ t06; \ + t14 = c & t11; \ + t15 = d | x ; \ + t16 = t01 | t10; \ + w = t13 ^ t15; \ + y = t14 ^ t16; \ + } + +/* XOR BLOCK1 into BLOCK0. */ +#define BLOCK_XOR(block0, block1) \ + { \ + block0[0] ^= block1[0]; \ + block0[1] ^= block1[1]; \ + block0[2] ^= block1[2]; \ + block0[3] ^= block1[3]; \ + } + +/* Copy BLOCK_SRC to BLOCK_DST. */ +#define BLOCK_COPY(block_dst, block_src) \ + { \ + block_dst[0] = block_src[0]; \ + block_dst[1] = block_src[1]; \ + block_dst[2] = block_src[2]; \ + block_dst[3] = block_src[3]; \ + } + +/* Apply SBOX number WHICH to to the block found in ARRAY0 at index + INDEX, writing the output to the block found in ARRAY1 at index + INDEX. */ +#define SBOX(which, array0, array1, index) \ + SBOX##which (array0[index + 0], array0[index + 1], \ + array0[index + 2], array0[index + 3], \ + array1[index + 0], array1[index + 1], \ + array1[index + 2], array1[index + 3]); + +/* Apply inverse SBOX number WHICH to to the block found in ARRAY0 at + index INDEX, writing the output to the block found in ARRAY1 at + index INDEX. */ +#define SBOX_INVERSE(which, array0, array1, index) \ + SBOX##which##_INVERSE (array0[index + 0], array0[index + 1], \ + array0[index + 2], array0[index + 3], \ + array1[index + 0], array1[index + 1], \ + array1[index + 2], array1[index + 3]); + +/* Apply the linear transformation to BLOCK. */ +#define LINEAR_TRANSFORMATION(block) \ + { \ + block[0] = rol (block[0], 13); \ + block[2] = rol (block[2], 3); \ + block[1] = block[1] ^ block[0] ^ block[2]; \ + block[3] = block[3] ^ block[2] ^ (block[0] << 3); \ + block[1] = rol (block[1], 1); \ + block[3] = rol (block[3], 7); \ + block[0] = block[0] ^ block[1] ^ block[3]; \ + block[2] = block[2] ^ block[3] ^ (block[1] << 7); \ + block[0] = rol (block[0], 5); \ + block[2] = rol (block[2], 22); \ + } + +/* Apply the inverse linear transformation to BLOCK. */ +#define LINEAR_TRANSFORMATION_INVERSE(block) \ + { \ + block[2] = ror (block[2], 22); \ + block[0] = ror (block[0] , 5); \ + block[2] = block[2] ^ block[3] ^ (block[1] << 7); \ + block[0] = block[0] ^ block[1] ^ block[3]; \ + block[3] = ror (block[3], 7); \ + block[1] = ror (block[1], 1); \ + block[3] = block[3] ^ block[2] ^ (block[0] << 3); \ + block[1] = block[1] ^ block[0] ^ block[2]; \ + block[2] = ror (block[2], 3); \ + block[0] = ror (block[0], 13); \ + } + +/* Apply a Serpent round to BLOCK, using the SBOX number WHICH and the + subkeys contained in SUBKEYS. Use BLOCK_TMP as temporary storage. + This macro increments `round'. */ +#define ROUND(which, subkeys, block, block_tmp) \ + { \ + BLOCK_XOR (block, subkeys[round]); \ + round++; \ + SBOX (which, block, block_tmp, 0); \ + LINEAR_TRANSFORMATION (block_tmp); \ + BLOCK_COPY (block, block_tmp); \ + } + +/* Apply the last Serpent round to BLOCK, using the SBOX number WHICH + and the subkeys contained in SUBKEYS. Use BLOCK_TMP as temporary + storage. The result will be stored in BLOCK_TMP. This macro + increments `round'. */ +#define ROUND_LAST(which, subkeys, block, block_tmp) \ + { \ + BLOCK_XOR (block, subkeys[round]); \ + round++; \ + SBOX (which, block, block_tmp, 0); \ + BLOCK_XOR (block_tmp, subkeys[round]); \ + round++; \ + } + +/* Apply an inverse Serpent round to BLOCK, using the SBOX number + WHICH and the subkeys contained in SUBKEYS. Use BLOCK_TMP as + temporary storage. This macro increments `round'. */ +#define ROUND_INVERSE(which, subkey, block, block_tmp) \ + { \ + LINEAR_TRANSFORMATION_INVERSE (block); \ + SBOX_INVERSE (which, block, block_tmp, 0); \ + BLOCK_XOR (block_tmp, subkey[round]); \ + round--; \ + BLOCK_COPY (block, block_tmp); \ + } + +/* Apply the first Serpent round to BLOCK, using the SBOX number WHICH + and the subkeys contained in SUBKEYS. Use BLOCK_TMP as temporary + storage. The result will be stored in BLOCK_TMP. This macro + increments `round'. */ +#define ROUND_FIRST_INVERSE(which, subkeys, block, block_tmp) \ + { \ + BLOCK_XOR (block, subkeys[round]); \ + round--; \ + SBOX_INVERSE (which, block, block_tmp, 0); \ + BLOCK_XOR (block_tmp, subkeys[round]); \ + round--; \ + } + +/* Convert the user provided key KEY of KEY_LENGTH bytes into the + internally used format. */ +static void +serpent_key_prepare (const byte *key, unsigned int key_length, + serpent_key_t key_prepared) +{ + int i; + + /* Copy key. */ + memcpy (key_prepared, key, key_length); + key_length /= 4; +#ifdef WORDS_BIGENDIAN + for (i = 0; i < key_length; i++) + key_prepared[i] = byte_swap_32 (key_prepared[i]); +#else + i = key_length; +#endif + if (i < 8) + { + /* Key must be padded according to the Serpent + specification. */ + key_prepared[i] = 0x00000001; + + for (i++; i < 8; i++) + key_prepared[i] = 0; + } +} + +/* Derive the 33 subkeys from KEY and store them in SUBKEYS. */ +static void +serpent_subkeys_generate (serpent_key_t key, serpent_subkeys_t subkeys) +{ + u32 w_real[140]; /* The `prekey'. */ + u32 k[132]; + u32 *w = &w_real[8]; + int i, j; + + /* Initialize with key values. */ + for (i = 0; i < 8; i++) + w[i - 8] = key[i]; + + /* Expand to intermediate key using the affine recurrence. */ + for (i = 0; i < 132; i++) + w[i] = rol (w[i - 8] ^ w[i - 5] ^ w[i - 3] ^ w[i - 1] ^ PHI ^ i, 11); + + /* Calculate subkeys via S-Boxes, in bitslice mode. */ + SBOX (3, w, k, 0); + SBOX (2, w, k, 4); + SBOX (1, w, k, 8); + SBOX (0, w, k, 12); + SBOX (7, w, k, 16); + SBOX (6, w, k, 20); + SBOX (5, w, k, 24); + SBOX (4, w, k, 28); + SBOX (3, w, k, 32); + SBOX (2, w, k, 36); + SBOX (1, w, k, 40); + SBOX (0, w, k, 44); + SBOX (7, w, k, 48); + SBOX (6, w, k, 52); + SBOX (5, w, k, 56); + SBOX (4, w, k, 60); + SBOX (3, w, k, 64); + SBOX (2, w, k, 68); + SBOX (1, w, k, 72); + SBOX (0, w, k, 76); + SBOX (7, w, k, 80); + SBOX (6, w, k, 84); + SBOX (5, w, k, 88); + SBOX (4, w, k, 92); + SBOX (3, w, k, 96); + SBOX (2, w, k, 100); + SBOX (1, w, k, 104); + SBOX (0, w, k, 108); + SBOX (7, w, k, 112); + SBOX (6, w, k, 116); + SBOX (5, w, k, 120); + SBOX (4, w, k, 124); + SBOX (3, w, k, 128); + + /* Renumber subkeys. */ + for (i = 0; i < ROUNDS + 1; i++) + for (j = 0; j < 4; j++) + subkeys[i][j] = k[4 * i + j]; +} + +/* Initialize CONTEXT with the key KEY of KEY_LENGTH bits. */ +static void +serpent_setkey_internal (serpent_context_t *context, + const byte *key, unsigned int key_length) +{ + serpent_key_t key_prepared; + + serpent_key_prepare (key, key_length, key_prepared); + serpent_subkeys_generate (key_prepared, context->keys); + _gcry_burn_stack (272 * sizeof (u32)); +} + +/* Initialize CTX with the key KEY of KEY_LENGTH bytes. */ +static gcry_err_code_t +serpent_setkey (void *ctx, + const byte *key, unsigned int key_length) +{ + serpent_context_t *context = ctx; + static const char *serpent_test_ret; + static int serpent_init_done; + gcry_err_code_t ret = GPG_ERR_NO_ERROR; + + if (! serpent_init_done) + { + /* Execute a self-test the first time, Serpent is used. */ + serpent_test_ret = serpent_test (); + if (serpent_test_ret) + log_error ("Serpent test failure: %s\n", serpent_test_ret); + serpent_init_done = 1; + } + + if (serpent_test_ret) + ret = GPG_ERR_SELFTEST_FAILED; + else + { + serpent_setkey_internal (context, key, key_length); + _gcry_burn_stack (sizeof (serpent_key_t)); + } + + return ret; +} + +static void +serpent_encrypt_internal (serpent_context_t *context, + const byte *input, byte *output) +{ + serpent_block_t b, b_next; + int round = 0; + + memcpy (b, input, sizeof (b)); +#ifdef WORDS_BIGENDIAN + b[0] = byte_swap_32 (b[0]); + b[1] = byte_swap_32 (b[1]); + b[2] = byte_swap_32 (b[2]); + b[3] = byte_swap_32 (b[3]); +#endif + + ROUND (0, context->keys, b, b_next); + ROUND (1, context->keys, b, b_next); + ROUND (2, context->keys, b, b_next); + ROUND (3, context->keys, b, b_next); + ROUND (4, context->keys, b, b_next); + ROUND (5, context->keys, b, b_next); + ROUND (6, context->keys, b, b_next); + ROUND (7, context->keys, b, b_next); + ROUND (0, context->keys, b, b_next); + ROUND (1, context->keys, b, b_next); + ROUND (2, context->keys, b, b_next); + ROUND (3, context->keys, b, b_next); + ROUND (4, context->keys, b, b_next); + ROUND (5, context->keys, b, b_next); + ROUND (6, context->keys, b, b_next); + ROUND (7, context->keys, b, b_next); + ROUND (0, context->keys, b, b_next); + ROUND (1, context->keys, b, b_next); + ROUND (2, context->keys, b, b_next); + ROUND (3, context->keys, b, b_next); + ROUND (4, context->keys, b, b_next); + ROUND (5, context->keys, b, b_next); + ROUND (6, context->keys, b, b_next); + ROUND (7, context->keys, b, b_next); + ROUND (0, context->keys, b, b_next); + ROUND (1, context->keys, b, b_next); + ROUND (2, context->keys, b, b_next); + ROUND (3, context->keys, b, b_next); + ROUND (4, context->keys, b, b_next); + ROUND (5, context->keys, b, b_next); + ROUND (6, context->keys, b, b_next); + + ROUND_LAST (7, context->keys, b, b_next); + +#ifdef WORDS_BIGENDIAN + b_next[0] = byte_swap_32 (b_next[0]); + b_next[1] = byte_swap_32 (b_next[1]); + b_next[2] = byte_swap_32 (b_next[2]); + b_next[3] = byte_swap_32 (b_next[3]); +#endif + memcpy (output, b_next, sizeof (b_next)); +} + +static void +serpent_decrypt_internal (serpent_context_t *context, + const byte *input, byte *output) +{ + serpent_block_t b, b_next; + int round = ROUNDS; + + memcpy (b_next, input, sizeof (b)); +#ifdef WORDS_BIGENDIAN + b_next[0] = byte_swap_32 (b_next[0]); + b_next[1] = byte_swap_32 (b_next[1]); + b_next[2] = byte_swap_32 (b_next[2]); + b_next[3] = byte_swap_32 (b_next[3]); +#endif + + ROUND_FIRST_INVERSE (7, context->keys, b_next, b); + + ROUND_INVERSE (6, context->keys, b, b_next); + ROUND_INVERSE (5, context->keys, b, b_next); + ROUND_INVERSE (4, context->keys, b, b_next); + ROUND_INVERSE (3, context->keys, b, b_next); + ROUND_INVERSE (2, context->keys, b, b_next); + ROUND_INVERSE (1, context->keys, b, b_next); + ROUND_INVERSE (0, context->keys, b, b_next); + ROUND_INVERSE (7, context->keys, b, b_next); + ROUND_INVERSE (6, context->keys, b, b_next); + ROUND_INVERSE (5, context->keys, b, b_next); + ROUND_INVERSE (4, context->keys, b, b_next); + ROUND_INVERSE (3, context->keys, b, b_next); + ROUND_INVERSE (2, context->keys, b, b_next); + ROUND_INVERSE (1, context->keys, b, b_next); + ROUND_INVERSE (0, context->keys, b, b_next); + ROUND_INVERSE (7, context->keys, b, b_next); + ROUND_INVERSE (6, context->keys, b, b_next); + ROUND_INVERSE (5, context->keys, b, b_next); + ROUND_INVERSE (4, context->keys, b, b_next); + ROUND_INVERSE (3, context->keys, b, b_next); + ROUND_INVERSE (2, context->keys, b, b_next); + ROUND_INVERSE (1, context->keys, b, b_next); + ROUND_INVERSE (0, context->keys, b, b_next); + ROUND_INVERSE (7, context->keys, b, b_next); + ROUND_INVERSE (6, context->keys, b, b_next); + ROUND_INVERSE (5, context->keys, b, b_next); + ROUND_INVERSE (4, context->keys, b, b_next); + ROUND_INVERSE (3, context->keys, b, b_next); + ROUND_INVERSE (2, context->keys, b, b_next); + ROUND_INVERSE (1, context->keys, b, b_next); + ROUND_INVERSE (0, context->keys, b, b_next); + +#ifdef WORDS_BIGENDIAN + b_next[0] = byte_swap_32 (b_next[0]); + b_next[1] = byte_swap_32 (b_next[1]); + b_next[2] = byte_swap_32 (b_next[2]); + b_next[3] = byte_swap_32 (b_next[3]); +#endif + memcpy (output, b_next, sizeof (b_next)); +} + +static void +serpent_encrypt (void *ctx, byte *buffer_out, const byte *buffer_in) +{ + serpent_context_t *context = ctx; + + serpent_encrypt_internal (context, buffer_in, buffer_out); + _gcry_burn_stack (2 * sizeof (serpent_block_t)); +} + +static void +serpent_decrypt (void *ctx, byte *buffer_out, const byte *buffer_in) +{ + serpent_context_t *context = ctx; + + serpent_decrypt_internal (context, buffer_in, buffer_out); + _gcry_burn_stack (2 * sizeof (serpent_block_t)); +} + + + +/* Serpent test. */ + +static const char *serpent_test (void) { return 0; } + + + +/* "SERPENT" is an alias for "SERPENT128". */ +static const char *cipher_spec_serpent128_aliases[] = + { + "SERPENT", + NULL + }; + +gcry_cipher_spec_t _gcry_cipher_spec_serpent128 = + { + "SERPENT128", cipher_spec_serpent128_aliases, NULL, 16, 128, + sizeof (serpent_context_t), + serpent_setkey, serpent_encrypt, serpent_decrypt + , +#ifdef GRUB_UTIL + .modname = "gcry_serpent", +#endif + }; + +gcry_cipher_spec_t _gcry_cipher_spec_serpent192 = + { + "SERPENT192", NULL, NULL, 16, 192, + sizeof (serpent_context_t), + serpent_setkey, serpent_encrypt, serpent_decrypt + , +#ifdef GRUB_UTIL + .modname = "gcry_serpent", +#endif + }; + +gcry_cipher_spec_t _gcry_cipher_spec_serpent256 = + { + "SERPENT256", NULL, NULL, 16, 256, + sizeof (serpent_context_t), + serpent_setkey, serpent_encrypt, serpent_decrypt + , +#ifdef GRUB_UTIL + .modname = "gcry_serpent", +#endif + }; + + +GRUB_MOD_INIT(gcry_serpent) +{ + grub_cipher_register (&_gcry_cipher_spec_serpent128); + grub_cipher_register (&_gcry_cipher_spec_serpent192); + grub_cipher_register (&_gcry_cipher_spec_serpent256); +} + +GRUB_MOD_FINI(gcry_serpent) +{ + grub_cipher_unregister (&_gcry_cipher_spec_serpent128); + grub_cipher_unregister (&_gcry_cipher_spec_serpent192); + grub_cipher_unregister (&_gcry_cipher_spec_serpent256); +} -- cgit v1.2.3