From aad2bbdb6fb7c8217d7e75480b38e45f00cb3abd Mon Sep 17 00:00:00 2001 From: reduz Date: Thu, 8 Oct 2015 15:00:40 -0300 Subject: newline fixes --- core/io/aes256.cpp | 718 ++++++++++++++++++++++++++--------------------------- 1 file changed, 359 insertions(+), 359 deletions(-) (limited to 'core/io/aes256.cpp') diff --git a/core/io/aes256.cpp b/core/io/aes256.cpp index 69a5091f1d..e7f465dcc6 100644 --- a/core/io/aes256.cpp +++ b/core/io/aes256.cpp @@ -1,359 +1,359 @@ -/* -* Byte-oriented AES-256 implementation. -* All lookup tables replaced with 'on the fly' calculations. -* -* Copyright (c) 2007-2009 Ilya O. Levin, http://www.literatecode.com -* Other contributors: Hal Finney -* -* Permission to use, copy, modify, and distribute this software for any -* purpose with or without fee is hereby granted, provided that the above -* copyright notice and this permission notice appear in all copies. -* -* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES -* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF -* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR -* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES -* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN -* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF -* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -*/ -#include "aes256.h" - -#define F(x) (((x)<<1) ^ ((((x)>>7) & 1) * 0x1b)) -#define FD(x) (((x) >> 1) ^ (((x) & 1) ? 0x8d : 0)) - -// #define BACK_TO_TABLES -#ifdef BACK_TO_TABLES - -const uint8_t sbox[256] = { - 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, - 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, - 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, - 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, - 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, - 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, - 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, - 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, - 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, - 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, - 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, - 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, - 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, - 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, - 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, - 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, - 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, - 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, - 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, - 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, - 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, - 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, - 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, - 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, - 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, - 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, - 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, - 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, - 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, - 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, - 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, - 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 -}; -const uint8_t sboxinv[256] = { - 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, - 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, - 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, - 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, - 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, - 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, - 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, - 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, - 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, - 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, - 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, - 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, - 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, - 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, - 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, - 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, - 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, - 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, - 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, - 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, - 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, - 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, - 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, - 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, - 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, - 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, - 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, - 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, - 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, - 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, - 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, - 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d -}; - -#define rj_sbox(x) sbox[(x)] -#define rj_sbox_inv(x) sboxinv[(x)] - -#else /* tableless subroutines */ - -/* -------------------------------------------------------------------------- */ -uint8_t gf_alog(uint8_t x) // calculate anti-logarithm gen 3 -{ - uint8_t atb = 1, z; - - while (x--) {z = atb; atb <<= 1; if (z & 0x80) atb^= 0x1b; atb ^= z;} - - return atb; -} /* gf_alog */ - -/* -------------------------------------------------------------------------- */ -uint8_t gf_log(uint8_t x) // calculate logarithm gen 3 -{ - uint8_t atb = 1, i = 0, z; - - do { - if (atb == x) break; - z = atb; atb <<= 1; if (z & 0x80) atb^= 0x1b; atb ^= z; - } while (++i > 0); - - return i; -} /* gf_log */ - - -/* -------------------------------------------------------------------------- */ -uint8_t gf_mulinv(uint8_t x) // calculate multiplicative inverse -{ - return (x) ? gf_alog(255 - gf_log(x)) : 0; -} /* gf_mulinv */ - -/* -------------------------------------------------------------------------- */ -uint8_t rj_sbox(uint8_t x) -{ - uint8_t y, sb; - - sb = y = gf_mulinv(x); - y = (y<<1)|(y>>7); sb ^= y; y = (y<<1)|(y>>7); sb ^= y; - y = (y<<1)|(y>>7); sb ^= y; y = (y<<1)|(y>>7); sb ^= y; - - return (sb ^ 0x63); -} /* rj_sbox */ - -/* -------------------------------------------------------------------------- */ -uint8_t rj_sbox_inv(uint8_t x) -{ - uint8_t y, sb; - - y = x ^ 0x63; - sb = y = (y<<1)|(y>>7); - y = (y<<2)|(y>>6); sb ^= y; y = (y<<3)|(y>>5); sb ^= y; - - return gf_mulinv(sb); -} /* rj_sbox_inv */ - -#endif - -/* -------------------------------------------------------------------------- */ -uint8_t rj_xtime(uint8_t x) -{ - return (x & 0x80) ? ((x << 1) ^ 0x1b) : (x << 1); -} /* rj_xtime */ - -/* -------------------------------------------------------------------------- */ -void aes_subBytes(uint8_t *buf) -{ - register uint8_t i = 16; - - while (i--) buf[i] = rj_sbox(buf[i]); -} /* aes_subBytes */ - -/* -------------------------------------------------------------------------- */ -void aes_subBytes_inv(uint8_t *buf) -{ - register uint8_t i = 16; - - while (i--) buf[i] = rj_sbox_inv(buf[i]); -} /* aes_subBytes_inv */ - -/* -------------------------------------------------------------------------- */ -void aes_addRoundKey(uint8_t *buf, uint8_t *key) -{ - register uint8_t i = 16; - - while (i--) buf[i] ^= key[i]; -} /* aes_addRoundKey */ - -/* -------------------------------------------------------------------------- */ -void aes_addRoundKey_cpy(uint8_t *buf, uint8_t *key, uint8_t *cpk) -{ - register uint8_t i = 16; - - while (i--) buf[i] ^= (cpk[i] = key[i]), cpk[16+i] = key[16 + i]; -} /* aes_addRoundKey_cpy */ - - -/* -------------------------------------------------------------------------- */ -void aes_shiftRows(uint8_t *buf) -{ - register uint8_t i, j; /* to make it potentially parallelable :) */ - - i = buf[1]; buf[1] = buf[5]; buf[5] = buf[9]; buf[9] = buf[13]; buf[13] = i; - i = buf[10]; buf[10] = buf[2]; buf[2] = i; - j = buf[3]; buf[3] = buf[15]; buf[15] = buf[11]; buf[11] = buf[7]; buf[7] = j; - j = buf[14]; buf[14] = buf[6]; buf[6] = j; - -} /* aes_shiftRows */ - -/* -------------------------------------------------------------------------- */ -void aes_shiftRows_inv(uint8_t *buf) -{ - register uint8_t i, j; /* same as above :) */ - - i = buf[1]; buf[1] = buf[13]; buf[13] = buf[9]; buf[9] = buf[5]; buf[5] = i; - i = buf[2]; buf[2] = buf[10]; buf[10] = i; - j = buf[3]; buf[3] = buf[7]; buf[7] = buf[11]; buf[11] = buf[15]; buf[15] = j; - j = buf[6]; buf[6] = buf[14]; buf[14] = j; - -} /* aes_shiftRows_inv */ - -/* -------------------------------------------------------------------------- */ -void aes_mixColumns(uint8_t *buf) -{ - register uint8_t i, a, b, c, d, e; - - for (i = 0; i < 16; i += 4) - { - a = buf[i]; b = buf[i + 1]; c = buf[i + 2]; d = buf[i + 3]; - e = a ^ b ^ c ^ d; - buf[i] ^= e ^ rj_xtime(a^b); buf[i+1] ^= e ^ rj_xtime(b^c); - buf[i+2] ^= e ^ rj_xtime(c^d); buf[i+3] ^= e ^ rj_xtime(d^a); - } -} /* aes_mixColumns */ - -/* -------------------------------------------------------------------------- */ -void aes_mixColumns_inv(uint8_t *buf) -{ - register uint8_t i, a, b, c, d, e, x, y, z; - - for (i = 0; i < 16; i += 4) - { - a = buf[i]; b = buf[i + 1]; c = buf[i + 2]; d = buf[i + 3]; - e = a ^ b ^ c ^ d; - z = rj_xtime(e); - x = e ^ rj_xtime(rj_xtime(z^a^c)); y = e ^ rj_xtime(rj_xtime(z^b^d)); - buf[i] ^= x ^ rj_xtime(a^b); buf[i+1] ^= y ^ rj_xtime(b^c); - buf[i+2] ^= x ^ rj_xtime(c^d); buf[i+3] ^= y ^ rj_xtime(d^a); - } -} /* aes_mixColumns_inv */ - -/* -------------------------------------------------------------------------- */ -void aes_expandEncKey(uint8_t *k, uint8_t *rc) -{ - register uint8_t i; - - k[0] ^= rj_sbox(k[29]) ^ (*rc); - k[1] ^= rj_sbox(k[30]); - k[2] ^= rj_sbox(k[31]); - k[3] ^= rj_sbox(k[28]); - *rc = F( *rc); - - for(i = 4; i < 16; i += 4) k[i] ^= k[i-4], k[i+1] ^= k[i-3], - k[i+2] ^= k[i-2], k[i+3] ^= k[i-1]; - k[16] ^= rj_sbox(k[12]); - k[17] ^= rj_sbox(k[13]); - k[18] ^= rj_sbox(k[14]); - k[19] ^= rj_sbox(k[15]); - - for(i = 20; i < 32; i += 4) k[i] ^= k[i-4], k[i+1] ^= k[i-3], - k[i+2] ^= k[i-2], k[i+3] ^= k[i-1]; - -} /* aes_expandEncKey */ - -/* -------------------------------------------------------------------------- */ -void aes_expandDecKey(uint8_t *k, uint8_t *rc) -{ - uint8_t i; - - for(i = 28; i > 16; i -= 4) k[i+0] ^= k[i-4], k[i+1] ^= k[i-3], - k[i+2] ^= k[i-2], k[i+3] ^= k[i-1]; - - k[16] ^= rj_sbox(k[12]); - k[17] ^= rj_sbox(k[13]); - k[18] ^= rj_sbox(k[14]); - k[19] ^= rj_sbox(k[15]); - - for(i = 12; i > 0; i -= 4) k[i+0] ^= k[i-4], k[i+1] ^= k[i-3], - k[i+2] ^= k[i-2], k[i+3] ^= k[i-1]; - - *rc = FD(*rc); - k[0] ^= rj_sbox(k[29]) ^ (*rc); - k[1] ^= rj_sbox(k[30]); - k[2] ^= rj_sbox(k[31]); - k[3] ^= rj_sbox(k[28]); -} /* aes_expandDecKey */ - - -/* -------------------------------------------------------------------------- */ -void aes256_init(aes256_context *ctx, uint8_t *k) -{ - uint8_t rcon = 1; - register uint8_t i; - - for (i = 0; i < sizeof(ctx->key); i++) ctx->enckey[i] = ctx->deckey[i] = k[i]; - for (i = 8;--i;) aes_expandEncKey(ctx->deckey, &rcon); -} /* aes256_init */ - -/* -------------------------------------------------------------------------- */ -void aes256_done(aes256_context *ctx) -{ - register uint8_t i; - - for (i = 0; i < sizeof(ctx->key); i++) - ctx->key[i] = ctx->enckey[i] = ctx->deckey[i] = 0; -} /* aes256_done */ - -/* -------------------------------------------------------------------------- */ -void aes256_encrypt_ecb(aes256_context *ctx, uint8_t *buf) -{ - uint8_t i, rcon; - - aes_addRoundKey_cpy(buf, ctx->enckey, ctx->key); - for(i = 1, rcon = 1; i < 14; ++i) - { - aes_subBytes(buf); - aes_shiftRows(buf); - aes_mixColumns(buf); - if( i & 1 ) aes_addRoundKey( buf, &ctx->key[16]); - else aes_expandEncKey(ctx->key, &rcon), aes_addRoundKey(buf, ctx->key); - } - aes_subBytes(buf); - aes_shiftRows(buf); - aes_expandEncKey(ctx->key, &rcon); - aes_addRoundKey(buf, ctx->key); -} /* aes256_encrypt */ - -/* -------------------------------------------------------------------------- */ -void aes256_decrypt_ecb(aes256_context *ctx, uint8_t *buf) -{ - uint8_t i, rcon; - - aes_addRoundKey_cpy(buf, ctx->deckey, ctx->key); - aes_shiftRows_inv(buf); - aes_subBytes_inv(buf); - - for (i = 14, rcon = 0x80; --i;) - { - if( ( i & 1 ) ) - { - aes_expandDecKey(ctx->key, &rcon); - aes_addRoundKey(buf, &ctx->key[16]); - } - else aes_addRoundKey(buf, ctx->key); - aes_mixColumns_inv(buf); - aes_shiftRows_inv(buf); - aes_subBytes_inv(buf); - } - aes_addRoundKey( buf, ctx->key); -} /* aes256_decrypt */ +/* +* Byte-oriented AES-256 implementation. +* All lookup tables replaced with 'on the fly' calculations. +* +* Copyright (c) 2007-2009 Ilya O. Levin, http://www.literatecode.com +* Other contributors: Hal Finney +* +* Permission to use, copy, modify, and distribute this software for any +* purpose with or without fee is hereby granted, provided that the above +* copyright notice and this permission notice appear in all copies. +* +* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ +#include "aes256.h" + +#define F(x) (((x)<<1) ^ ((((x)>>7) & 1) * 0x1b)) +#define FD(x) (((x) >> 1) ^ (((x) & 1) ? 0x8d : 0)) + +// #define BACK_TO_TABLES +#ifdef BACK_TO_TABLES + +const uint8_t sbox[256] = { + 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, + 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, + 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, + 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, + 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, + 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, + 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, + 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, + 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, + 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, + 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, + 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, + 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, + 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, + 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, + 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, + 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, + 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, + 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, + 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, + 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, + 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, + 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, + 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, + 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, + 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, + 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, + 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, + 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, + 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, + 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, + 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 +}; +const uint8_t sboxinv[256] = { + 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, + 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, + 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, + 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, + 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, + 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, + 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, + 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, + 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, + 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, + 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, + 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, + 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, + 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, + 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, + 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, + 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, + 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, + 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, + 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, + 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, + 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, + 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, + 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, + 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, + 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, + 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, + 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, + 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, + 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, + 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, + 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d +}; + +#define rj_sbox(x) sbox[(x)] +#define rj_sbox_inv(x) sboxinv[(x)] + +#else /* tableless subroutines */ + +/* -------------------------------------------------------------------------- */ +uint8_t gf_alog(uint8_t x) // calculate anti-logarithm gen 3 +{ + uint8_t atb = 1, z; + + while (x--) {z = atb; atb <<= 1; if (z & 0x80) atb^= 0x1b; atb ^= z;} + + return atb; +} /* gf_alog */ + +/* -------------------------------------------------------------------------- */ +uint8_t gf_log(uint8_t x) // calculate logarithm gen 3 +{ + uint8_t atb = 1, i = 0, z; + + do { + if (atb == x) break; + z = atb; atb <<= 1; if (z & 0x80) atb^= 0x1b; atb ^= z; + } while (++i > 0); + + return i; +} /* gf_log */ + + +/* -------------------------------------------------------------------------- */ +uint8_t gf_mulinv(uint8_t x) // calculate multiplicative inverse +{ + return (x) ? gf_alog(255 - gf_log(x)) : 0; +} /* gf_mulinv */ + +/* -------------------------------------------------------------------------- */ +uint8_t rj_sbox(uint8_t x) +{ + uint8_t y, sb; + + sb = y = gf_mulinv(x); + y = (y<<1)|(y>>7); sb ^= y; y = (y<<1)|(y>>7); sb ^= y; + y = (y<<1)|(y>>7); sb ^= y; y = (y<<1)|(y>>7); sb ^= y; + + return (sb ^ 0x63); +} /* rj_sbox */ + +/* -------------------------------------------------------------------------- */ +uint8_t rj_sbox_inv(uint8_t x) +{ + uint8_t y, sb; + + y = x ^ 0x63; + sb = y = (y<<1)|(y>>7); + y = (y<<2)|(y>>6); sb ^= y; y = (y<<3)|(y>>5); sb ^= y; + + return gf_mulinv(sb); +} /* rj_sbox_inv */ + +#endif + +/* -------------------------------------------------------------------------- */ +uint8_t rj_xtime(uint8_t x) +{ + return (x & 0x80) ? ((x << 1) ^ 0x1b) : (x << 1); +} /* rj_xtime */ + +/* -------------------------------------------------------------------------- */ +void aes_subBytes(uint8_t *buf) +{ + register uint8_t i = 16; + + while (i--) buf[i] = rj_sbox(buf[i]); +} /* aes_subBytes */ + +/* -------------------------------------------------------------------------- */ +void aes_subBytes_inv(uint8_t *buf) +{ + register uint8_t i = 16; + + while (i--) buf[i] = rj_sbox_inv(buf[i]); +} /* aes_subBytes_inv */ + +/* -------------------------------------------------------------------------- */ +void aes_addRoundKey(uint8_t *buf, uint8_t *key) +{ + register uint8_t i = 16; + + while (i--) buf[i] ^= key[i]; +} /* aes_addRoundKey */ + +/* -------------------------------------------------------------------------- */ +void aes_addRoundKey_cpy(uint8_t *buf, uint8_t *key, uint8_t *cpk) +{ + register uint8_t i = 16; + + while (i--) buf[i] ^= (cpk[i] = key[i]), cpk[16+i] = key[16 + i]; +} /* aes_addRoundKey_cpy */ + + +/* -------------------------------------------------------------------------- */ +void aes_shiftRows(uint8_t *buf) +{ + register uint8_t i, j; /* to make it potentially parallelable :) */ + + i = buf[1]; buf[1] = buf[5]; buf[5] = buf[9]; buf[9] = buf[13]; buf[13] = i; + i = buf[10]; buf[10] = buf[2]; buf[2] = i; + j = buf[3]; buf[3] = buf[15]; buf[15] = buf[11]; buf[11] = buf[7]; buf[7] = j; + j = buf[14]; buf[14] = buf[6]; buf[6] = j; + +} /* aes_shiftRows */ + +/* -------------------------------------------------------------------------- */ +void aes_shiftRows_inv(uint8_t *buf) +{ + register uint8_t i, j; /* same as above :) */ + + i = buf[1]; buf[1] = buf[13]; buf[13] = buf[9]; buf[9] = buf[5]; buf[5] = i; + i = buf[2]; buf[2] = buf[10]; buf[10] = i; + j = buf[3]; buf[3] = buf[7]; buf[7] = buf[11]; buf[11] = buf[15]; buf[15] = j; + j = buf[6]; buf[6] = buf[14]; buf[14] = j; + +} /* aes_shiftRows_inv */ + +/* -------------------------------------------------------------------------- */ +void aes_mixColumns(uint8_t *buf) +{ + register uint8_t i, a, b, c, d, e; + + for (i = 0; i < 16; i += 4) + { + a = buf[i]; b = buf[i + 1]; c = buf[i + 2]; d = buf[i + 3]; + e = a ^ b ^ c ^ d; + buf[i] ^= e ^ rj_xtime(a^b); buf[i+1] ^= e ^ rj_xtime(b^c); + buf[i+2] ^= e ^ rj_xtime(c^d); buf[i+3] ^= e ^ rj_xtime(d^a); + } +} /* aes_mixColumns */ + +/* -------------------------------------------------------------------------- */ +void aes_mixColumns_inv(uint8_t *buf) +{ + register uint8_t i, a, b, c, d, e, x, y, z; + + for (i = 0; i < 16; i += 4) + { + a = buf[i]; b = buf[i + 1]; c = buf[i + 2]; d = buf[i + 3]; + e = a ^ b ^ c ^ d; + z = rj_xtime(e); + x = e ^ rj_xtime(rj_xtime(z^a^c)); y = e ^ rj_xtime(rj_xtime(z^b^d)); + buf[i] ^= x ^ rj_xtime(a^b); buf[i+1] ^= y ^ rj_xtime(b^c); + buf[i+2] ^= x ^ rj_xtime(c^d); buf[i+3] ^= y ^ rj_xtime(d^a); + } +} /* aes_mixColumns_inv */ + +/* -------------------------------------------------------------------------- */ +void aes_expandEncKey(uint8_t *k, uint8_t *rc) +{ + register uint8_t i; + + k[0] ^= rj_sbox(k[29]) ^ (*rc); + k[1] ^= rj_sbox(k[30]); + k[2] ^= rj_sbox(k[31]); + k[3] ^= rj_sbox(k[28]); + *rc = F( *rc); + + for(i = 4; i < 16; i += 4) k[i] ^= k[i-4], k[i+1] ^= k[i-3], + k[i+2] ^= k[i-2], k[i+3] ^= k[i-1]; + k[16] ^= rj_sbox(k[12]); + k[17] ^= rj_sbox(k[13]); + k[18] ^= rj_sbox(k[14]); + k[19] ^= rj_sbox(k[15]); + + for(i = 20; i < 32; i += 4) k[i] ^= k[i-4], k[i+1] ^= k[i-3], + k[i+2] ^= k[i-2], k[i+3] ^= k[i-1]; + +} /* aes_expandEncKey */ + +/* -------------------------------------------------------------------------- */ +void aes_expandDecKey(uint8_t *k, uint8_t *rc) +{ + uint8_t i; + + for(i = 28; i > 16; i -= 4) k[i+0] ^= k[i-4], k[i+1] ^= k[i-3], + k[i+2] ^= k[i-2], k[i+3] ^= k[i-1]; + + k[16] ^= rj_sbox(k[12]); + k[17] ^= rj_sbox(k[13]); + k[18] ^= rj_sbox(k[14]); + k[19] ^= rj_sbox(k[15]); + + for(i = 12; i > 0; i -= 4) k[i+0] ^= k[i-4], k[i+1] ^= k[i-3], + k[i+2] ^= k[i-2], k[i+3] ^= k[i-1]; + + *rc = FD(*rc); + k[0] ^= rj_sbox(k[29]) ^ (*rc); + k[1] ^= rj_sbox(k[30]); + k[2] ^= rj_sbox(k[31]); + k[3] ^= rj_sbox(k[28]); +} /* aes_expandDecKey */ + + +/* -------------------------------------------------------------------------- */ +void aes256_init(aes256_context *ctx, uint8_t *k) +{ + uint8_t rcon = 1; + register uint8_t i; + + for (i = 0; i < sizeof(ctx->key); i++) ctx->enckey[i] = ctx->deckey[i] = k[i]; + for (i = 8;--i;) aes_expandEncKey(ctx->deckey, &rcon); +} /* aes256_init */ + +/* -------------------------------------------------------------------------- */ +void aes256_done(aes256_context *ctx) +{ + register uint8_t i; + + for (i = 0; i < sizeof(ctx->key); i++) + ctx->key[i] = ctx->enckey[i] = ctx->deckey[i] = 0; +} /* aes256_done */ + +/* -------------------------------------------------------------------------- */ +void aes256_encrypt_ecb(aes256_context *ctx, uint8_t *buf) +{ + uint8_t i, rcon; + + aes_addRoundKey_cpy(buf, ctx->enckey, ctx->key); + for(i = 1, rcon = 1; i < 14; ++i) + { + aes_subBytes(buf); + aes_shiftRows(buf); + aes_mixColumns(buf); + if( i & 1 ) aes_addRoundKey( buf, &ctx->key[16]); + else aes_expandEncKey(ctx->key, &rcon), aes_addRoundKey(buf, ctx->key); + } + aes_subBytes(buf); + aes_shiftRows(buf); + aes_expandEncKey(ctx->key, &rcon); + aes_addRoundKey(buf, ctx->key); +} /* aes256_encrypt */ + +/* -------------------------------------------------------------------------- */ +void aes256_decrypt_ecb(aes256_context *ctx, uint8_t *buf) +{ + uint8_t i, rcon; + + aes_addRoundKey_cpy(buf, ctx->deckey, ctx->key); + aes_shiftRows_inv(buf); + aes_subBytes_inv(buf); + + for (i = 14, rcon = 0x80; --i;) + { + if( ( i & 1 ) ) + { + aes_expandDecKey(ctx->key, &rcon); + aes_addRoundKey(buf, &ctx->key[16]); + } + else aes_addRoundKey(buf, ctx->key); + aes_mixColumns_inv(buf); + aes_shiftRows_inv(buf); + aes_subBytes_inv(buf); + } + aes_addRoundKey( buf, ctx->key); +} /* aes256_decrypt */ -- cgit v1.2.3