diff options
author | Supraja Meedinti <supraja0493@gmail.com> | 2015-01-25 21:39:20 +0300 |
---|---|---|
committer | Michael Niedermayer <michaelni@gmx.at> | 2015-01-29 03:56:11 +0300 |
commit | 6ad749b5335444e5ca2223997d2ab2a215363327 (patch) | |
tree | a489c8f149446bb4ab04915d7f4ca5a0747544f5 | |
parent | 72db3c79dfddbeae82c540c785c680654a77b063 (diff) |
libavutil: Added twofish symmetric block cipher
Signed-off-by: Supraja Meedinti <supraja0493@gmail.com>
Reviewed-by: Giorgio Vazzana <mywing81@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
-rw-r--r-- | Changelog | 1 | ||||
-rw-r--r-- | libavutil/Makefile | 3 | ||||
-rw-r--r-- | libavutil/twofish.c | 375 | ||||
-rw-r--r-- | libavutil/twofish.h | 70 |
4 files changed, 449 insertions, 0 deletions
@@ -16,6 +16,7 @@ version <next>: - Closed caption Decoder - fspp, uspp, pp7 MPlayer postprocessing filters ported to native filters - showpalette filter +- Twofish symmetric block cipher version 2.5: diff --git a/libavutil/Makefile b/libavutil/Makefile index 4db89b8258..6caf896e2d 100644 --- a/libavutil/Makefile +++ b/libavutil/Makefile @@ -60,6 +60,7 @@ HEADERS = adler32.h \ time.h \ timecode.h \ timestamp.h \ + twofish.h \ version.h \ xtea.h \ @@ -129,6 +130,7 @@ OBJS = adler32.o \ time.o \ timecode.o \ tree.o \ + twofish.o \ utils.o \ xga_font_data.o \ xtea.o \ @@ -184,6 +186,7 @@ TESTPROGS = adler32 \ sha512 \ softfloat \ tree \ + twofish \ utf8 \ xtea \ diff --git a/libavutil/twofish.c b/libavutil/twofish.c new file mode 100644 index 0000000000..337c099546 --- /dev/null +++ b/libavutil/twofish.c @@ -0,0 +1,375 @@ +/* + * An implementation of the TwoFish algorithm + * Copyright (c) 2015 Supraja Meedinti + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "twofish.h" +#include "common.h" +#include "intreadwrite.h" +#include "attributes.h" + +#define LR(x, n) ((x) << (n) | (x) >> (32 - (n))) +#define RR(x, n) ((x) >> (n) | (x) << (32 - (n))) + +typedef struct AVTWOFISH { + uint32_t K[40]; + uint32_t S[4]; + int ksize; +} AVTWOFISH; + +static const uint8_t MD1[256] = { + 0x00, 0x5b, 0xb6, 0xed, 0x05, 0x5e, 0xb3, 0xe8, 0x0a, 0x51, 0xbc, 0xe7, 0x0f, 0x54, 0xb9, 0xe2, + 0x14, 0x4f, 0xa2, 0xf9, 0x11, 0x4a, 0xa7, 0xfc, 0x1e, 0x45, 0xa8, 0xf3, 0x1b, 0x40, 0xad, 0xf6, + 0x28, 0x73, 0x9e, 0xc5, 0x2d, 0x76, 0x9b, 0xc0, 0x22, 0x79, 0x94, 0xcf, 0x27, 0x7c, 0x91, 0xca, + 0x3c, 0x67, 0x8a, 0xd1, 0x39, 0x62, 0x8f, 0xd4, 0x36, 0x6d, 0x80, 0xdb, 0x33, 0x68, 0x85, 0xde, + 0x50, 0x0b, 0xe6, 0xbd, 0x55, 0x0e, 0xe3, 0xb8, 0x5a, 0x01, 0xec, 0xb7, 0x5f, 0x04, 0xe9, 0xb2, + 0x44, 0x1f, 0xf2, 0xa9, 0x41, 0x1a, 0xf7, 0xac, 0x4e, 0x15, 0xf8, 0xa3, 0x4b, 0x10, 0xfd, 0xa6, + 0x78, 0x23, 0xce, 0x95, 0x7d, 0x26, 0xcb, 0x90, 0x72, 0x29, 0xc4, 0x9f, 0x77, 0x2c, 0xc1, 0x9a, + 0x6c, 0x37, 0xda, 0x81, 0x69, 0x32, 0xdf, 0x84, 0x66, 0x3d, 0xd0, 0x8b, 0x63, 0x38, 0xd5, 0x8e, + 0xa0, 0xfb, 0x16, 0x4d, 0xa5, 0xfe, 0x13, 0x48, 0xaa, 0xf1, 0x1c, 0x47, 0xaf, 0xf4, 0x19, 0x42, + 0xb4, 0xef, 0x02, 0x59, 0xb1, 0xea, 0x07, 0x5c, 0xbe, 0xe5, 0x08, 0x53, 0xbb, 0xe0, 0x0d, 0x56, + 0x88, 0xd3, 0x3e, 0x65, 0x8d, 0xd6, 0x3b, 0x60, 0x82, 0xd9, 0x34, 0x6f, 0x87, 0xdc, 0x31, 0x6a, + 0x9c, 0xc7, 0x2a, 0x71, 0x99, 0xc2, 0x2f, 0x74, 0x96, 0xcd, 0x20, 0x7b, 0x93, 0xc8, 0x25, 0x7e, + 0xf0, 0xab, 0x46, 0x1d, 0xf5, 0xae, 0x43, 0x18, 0xfa, 0xa1, 0x4c, 0x17, 0xff, 0xa4, 0x49, 0x12, + 0xe4, 0xbf, 0x52, 0x09, 0xe1, 0xba, 0x57, 0x0c, 0xee, 0xb5, 0x58, 0x03, 0xeb, 0xb0, 0x5d, 0x06, + 0xd8, 0x83, 0x6e, 0x35, 0xdd, 0x86, 0x6b, 0x30, 0xd2, 0x89, 0x64, 0x3f, 0xd7, 0x8c, 0x61, 0x3a, + 0xcc, 0x97, 0x7a, 0x21, 0xc9, 0x92, 0x7f, 0x24, 0xc6, 0x9d, 0x70, 0x2b, 0xc3, 0x98, 0x75, 0x2e +}; + +static const uint8_t MD2[256] = { + 0x00, 0xef, 0xb7, 0x58, 0x07, 0xe8, 0xb0, 0x5f, 0x0e, 0xe1, 0xb9, 0x56, 0x09, 0xe6, 0xbe, 0x51, + 0x1c, 0xf3, 0xab, 0x44, 0x1b, 0xf4, 0xac, 0x43, 0x12, 0xfd, 0xa5, 0x4a, 0x15, 0xfa, 0xa2, 0x4d, + 0x38, 0xd7, 0x8f, 0x60, 0x3f, 0xd0, 0x88, 0x67, 0x36, 0xd9, 0x81, 0x6e, 0x31, 0xde, 0x86, 0x69, + 0x24, 0xcb, 0x93, 0x7c, 0x23, 0xcc, 0x94, 0x7b, 0x2a, 0xc5, 0x9d, 0x72, 0x2d, 0xc2, 0x9a, 0x75, + 0x70, 0x9f, 0xc7, 0x28, 0x77, 0x98, 0xc0, 0x2f, 0x7e, 0x91, 0xc9, 0x26, 0x79, 0x96, 0xce, 0x21, + 0x6c, 0x83, 0xdb, 0x34, 0x6b, 0x84, 0xdc, 0x33, 0x62, 0x8d, 0xd5, 0x3a, 0x65, 0x8a, 0xd2, 0x3d, + 0x48, 0xa7, 0xff, 0x10, 0x4f, 0xa0, 0xf8, 0x17, 0x46, 0xa9, 0xf1, 0x1e, 0x41, 0xae, 0xf6, 0x19, + 0x54, 0xbb, 0xe3, 0x0c, 0x53, 0xbc, 0xe4, 0x0b, 0x5a, 0xb5, 0xed, 0x02, 0x5d, 0xb2, 0xea, 0x05, + 0xe0, 0x0f, 0x57, 0xb8, 0xe7, 0x08, 0x50, 0xbf, 0xee, 0x01, 0x59, 0xb6, 0xe9, 0x06, 0x5e, 0xb1, + 0xfc, 0x13, 0x4b, 0xa4, 0xfb, 0x14, 0x4c, 0xa3, 0xf2, 0x1d, 0x45, 0xaa, 0xf5, 0x1a, 0x42, 0xad, + 0xd8, 0x37, 0x6f, 0x80, 0xdf, 0x30, 0x68, 0x87, 0xd6, 0x39, 0x61, 0x8e, 0xd1, 0x3e, 0x66, 0x89, + 0xc4, 0x2b, 0x73, 0x9c, 0xc3, 0x2c, 0x74, 0x9b, 0xca, 0x25, 0x7d, 0x92, 0xcd, 0x22, 0x7a, 0x95, + 0x90, 0x7f, 0x27, 0xc8, 0x97, 0x78, 0x20, 0xcf, 0x9e, 0x71, 0x29, 0xc6, 0x99, 0x76, 0x2e, 0xc1, + 0x8c, 0x63, 0x3b, 0xd4, 0x8b, 0x64, 0x3c, 0xd3, 0x82, 0x6d, 0x35, 0xda, 0x85, 0x6a, 0x32, 0xdd, + 0xa8, 0x47, 0x1f, 0xf0, 0xaf, 0x40, 0x18, 0xf7, 0xa6, 0x49, 0x11, 0xfe, 0xa1, 0x4e, 0x16, 0xf9, + 0xb4, 0x5b, 0x03, 0xec, 0xb3, 0x5c, 0x04, 0xeb, 0xba, 0x55, 0x0d, 0xe2, 0xbd, 0x52, 0x0a, 0xe5 +}; + +static const uint8_t q0[256] = { + 0xa9, 0x67, 0xb3, 0xe8, 0x04, 0xfd, 0xa3, 0x76, 0x9a, 0x92, 0x80, 0x78, 0xe4, 0xdd, 0xd1, 0x38, + 0x0d, 0xc6, 0x35, 0x98, 0x18, 0xf7, 0xec, 0x6c, 0x43, 0x75, 0x37, 0x26, 0xfa, 0x13, 0x94, 0x48, + 0xf2, 0xd0, 0x8b, 0x30, 0x84, 0x54, 0xdf, 0x23, 0x19, 0x5b, 0x3d, 0x59, 0xf3, 0xae, 0xa2, 0x82, + 0x63, 0x01, 0x83, 0x2e, 0xd9, 0x51, 0x9b, 0x7c, 0xa6, 0xeb, 0xa5, 0xbe, 0x16, 0x0c, 0xe3, 0x61, + 0xc0, 0x8c, 0x3a, 0xf5, 0x73, 0x2c, 0x25, 0x0b, 0xbb, 0x4e, 0x89, 0x6b, 0x53, 0x6a, 0xb4, 0xf1, + 0xe1, 0xe6, 0xbd, 0x45, 0xe2, 0xf4, 0xb6, 0x66, 0xcc, 0x95, 0x03, 0x56, 0xd4, 0x1c, 0x1e, 0xd7, + 0xfb, 0xc3, 0x8e, 0xb5, 0xe9, 0xcf, 0xbf, 0xba, 0xea, 0x77, 0x39, 0xaf, 0x33, 0xc9, 0x62, 0x71, + 0x81, 0x79, 0x09, 0xad, 0x24, 0xcd, 0xf9, 0xd8, 0xe5, 0xc5, 0xb9, 0x4d, 0x44, 0x08, 0x86, 0xe7, + 0xa1, 0x1d, 0xaa, 0xed, 0x06, 0x70, 0xb2, 0xd2, 0x41, 0x7b, 0xa0, 0x11, 0x31, 0xc2, 0x27, 0x90, + 0x20, 0xf6, 0x60, 0xff, 0x96, 0x5c, 0xb1, 0xab, 0x9e, 0x9c, 0x52, 0x1b, 0x5f, 0x93, 0x0a, 0xef, + 0x91, 0x85, 0x49, 0xee, 0x2d, 0x4f, 0x8f, 0x3b, 0x47, 0x87, 0x6d, 0x46, 0xd6, 0x3e, 0x69, 0x64, + 0x2a, 0xce, 0xcb, 0x2f, 0xfc, 0x97, 0x05, 0x7a, 0xac, 0x7f, 0xd5, 0x1a, 0x4b, 0x0e, 0xa7, 0x5a, + 0x28, 0x14, 0x3f, 0x29, 0x88, 0x3c, 0x4c, 0x02, 0xb8, 0xda, 0xb0, 0x17, 0x55, 0x1f, 0x8a, 0x7d, + 0x57, 0xc7, 0x8d, 0x74, 0xb7, 0xc4, 0x9f, 0x72, 0x7e, 0x15, 0x22, 0x12, 0x58, 0x07, 0x99, 0x34, + 0x6e, 0x50, 0xde, 0x68, 0x65, 0xbc, 0xdb, 0xf8, 0xc8, 0xa8, 0x2b, 0x40, 0xdc, 0xfe, 0x32, 0xa4, + 0xca, 0x10, 0x21, 0xf0, 0xd3, 0x5d, 0x0f, 0x00, 0x6f, 0x9d, 0x36, 0x42, 0x4a, 0x5e, 0xc1, 0xe0 +}; + +static const uint8_t q1[256] = { + 0x75, 0xf3, 0xc6, 0xf4, 0xdb, 0x7b, 0xfb, 0xc8, 0x4a, 0xd3, 0xe6, 0x6b, 0x45, 0x7d, 0xe8, 0x4b, + 0xd6, 0x32, 0xd8, 0xfd, 0x37, 0x71, 0xf1, 0xe1, 0x30, 0x0f, 0xf8, 0x1b, 0x87, 0xfa, 0x06, 0x3f, + 0x5e, 0xba, 0xae, 0x5b, 0x8a, 0x00, 0xbc, 0x9d, 0x6d, 0xc1, 0xb1, 0x0e, 0x80, 0x5d, 0xd2, 0xd5, + 0xa0, 0x84, 0x07, 0x14, 0xb5, 0x90, 0x2c, 0xa3, 0xb2, 0x73, 0x4c, 0x54, 0x92, 0x74, 0x36, 0x51, + 0x38, 0xb0, 0xbd, 0x5a, 0xfc, 0x60, 0x62, 0x96, 0x6c, 0x42, 0xf7, 0x10, 0x7c, 0x28, 0x27, 0x8c, + 0x13, 0x95, 0x9c, 0xc7, 0x24, 0x46, 0x3b, 0x70, 0xca, 0xe3, 0x85, 0xcb, 0x11, 0xd0, 0x93, 0xb8, + 0xa6, 0x83, 0x20, 0xff, 0x9f, 0x77, 0xc3, 0xcc, 0x03, 0x6f, 0x08, 0xbf, 0x40, 0xe7, 0x2b, 0xe2, + 0x79, 0x0c, 0xaa, 0x82, 0x41, 0x3a, 0xea, 0xb9, 0xe4, 0x9a, 0xa4, 0x97, 0x7e, 0xda, 0x7a, 0x17, + 0x66, 0x94, 0xa1, 0x1d, 0x3d, 0xf0, 0xde, 0xb3, 0x0b, 0x72, 0xa7, 0x1c, 0xef, 0xd1, 0x53, 0x3e, + 0x8f, 0x33, 0x26, 0x5f, 0xec, 0x76, 0x2a, 0x49, 0x81, 0x88, 0xee, 0x21, 0xc4, 0x1a, 0xeb, 0xd9, + 0xc5, 0x39, 0x99, 0xcd, 0xad, 0x31, 0x8b, 0x01, 0x18, 0x23, 0xdd, 0x1f, 0x4e, 0x2d, 0xf9, 0x48, + 0x4f, 0xf2, 0x65, 0x8e, 0x78, 0x5c, 0x58, 0x19, 0x8d, 0xe5, 0x98, 0x57, 0x67, 0x7f, 0x05, 0x64, + 0xaf, 0x63, 0xb6, 0xfe, 0xf5, 0xb7, 0x3c, 0xa5, 0xce, 0xe9, 0x68, 0x44, 0xe0, 0x4d, 0x43, 0x69, + 0x29, 0x2e, 0xac, 0x15, 0x59, 0xa8, 0x0a, 0x9e, 0x6e, 0x47, 0xdf, 0x34, 0x35, 0x6a, 0xcf, 0xdc, + 0x22, 0xc9, 0xc0, 0x9b, 0x89, 0xd4, 0xed, 0xab, 0x12, 0xa2, 0x0d, 0x52, 0xbb, 0x02, 0x2f, 0xa9, + 0xd7, 0x61, 0x1e, 0xb4, 0x50, 0x04, 0xf6, 0xc2, 0x16, 0x25, 0x86, 0x56, 0x55, 0x09, 0xbe, 0x91 +}; + +struct AVTWOFISH *av_twofish_alloc(void) +{ + return av_mallocz(sizeof(struct AVTWOFISH)); +} + +const int av_twofish_size = sizeof(AVTWOFISH); + +static uint8_t gfmul(uint8_t a, uint8_t b) +{ + uint8_t r = 0, t; + while (a && b) { + if (a & 1) + r = r ^ b; + t = b & 0x80; + b = b << 1; + if (t) + b = b ^ 0x4d; + a = a >> 1; + } + return r; +} + +static uint32_t tf_RS(uint32_t k0, uint32_t k1) +{ + uint8_t s[4], m[8]; + AV_WL32(m, k0); + AV_WL32(m + 4, k1); + s[0] = gfmul(0x01, m[0]) ^ gfmul(0xa4, m[1]) ^ gfmul(0x55, m[2]) ^ gfmul(0x87, m[3]) ^ gfmul(0x5a, m[4]) ^ gfmul(0x58, m[5]) ^ gfmul(0xdb, m[6]) ^ gfmul(0x9e, m[7]); + s[1] = gfmul(0xa4, m[0]) ^ gfmul(0x56, m[1]) ^ gfmul(0x82, m[2]) ^ gfmul(0xf3, m[3]) ^ gfmul(0x1e, m[4]) ^ gfmul(0xc6, m[5]) ^ gfmul(0x68, m[6]) ^ gfmul(0xe5, m[7]); + s[2] = gfmul(0x02, m[0]) ^ gfmul(0xa1, m[1]) ^ gfmul(0xfc, m[2]) ^ gfmul(0xc1, m[3]) ^ gfmul(0x47, m[4]) ^ gfmul(0xae, m[5]) ^ gfmul(0x3d, m[6]) ^ gfmul(0x19, m[7]); + s[3] = gfmul(0xa4, m[0]) ^ gfmul(0x55, m[1]) ^ gfmul(0x87, m[2]) ^ gfmul(0x5a, m[3]) ^ gfmul(0x58, m[4]) ^ gfmul(0xdb, m[5]) ^ gfmul(0x9e, m[6]) ^ gfmul(0x03, m[7]); + return AV_RL32(s); +} + +static uint32_t tf_h(uint32_t X, uint32_t L[4], int k) +{ + uint8_t y[4], l[4]; + AV_WL32(y, X); + if (k == 4) { + AV_WL32(l, L[3]); + y[0] = q1[y[0]] ^ l[0]; + y[1] = q0[y[1]] ^ l[1]; + y[2] = q0[y[2]] ^ l[2]; + y[3] = q1[y[3]] ^ l[3]; + } + if (k >= 3) { + AV_WL32(l, L[2]); + y[0] = q1[y[0]] ^ l[0]; + y[1] = q1[y[1]] ^ l[1]; + y[2] = q0[y[2]] ^ l[2]; + y[3] = q0[y[3]] ^ l[3]; + } + AV_WL32(l, L[1]); + y[0] = q1[q0[q0[y[0]] ^ l[0]] ^ (L[0] & 0xff)]; + y[1] = q0[q0[q1[y[1]] ^ l[1]] ^ ((L[0] >> 8) & 0xff)]; + y[2] = q1[q1[q0[y[2]] ^ l[2]] ^ ((L[0] >> 16) & 0xff)]; + y[3] = q0[q1[q1[y[3]] ^ l[3]] ^ (L[0] >> 24)]; + + l[0] = y[0] ^ MD2[y[1]] ^ MD1[y[2]] ^ MD1[y[3]]; + l[1] = MD1[y[0]] ^ MD2[y[1]] ^ MD2[y[2]] ^ y[3]; + l[2] = MD2[y[0]] ^ MD1[y[1]] ^ y[2] ^ MD2[y[3]]; + l[3] = MD2[y[0]] ^ y[1] ^ MD2[y[2]] ^ MD1[y[3]]; + + return AV_RL32(l); +} + +static void twofish_encrypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src) +{ + uint32_t P[4], t0, t1; + int i; + P[0] = AV_RL32(src) ^ cs->K[0]; + P[1] = AV_RL32(src + 4) ^ cs->K[1]; + P[2] = AV_RL32(src + 8) ^ cs->K[2]; + P[3] = AV_RL32(src + 12) ^ cs->K[3]; + for (i = 0; i < 16; i += 2) { + t0 = tf_h(P[0], cs->S, cs->ksize); + t1 = tf_h(LR(P[1], 8), cs->S, cs->ksize); + P[2] = RR(P[2] ^ (t0 + t1 + cs->K[2 * i + 8]), 1); + P[3] = LR(P[3], 1) ^ (t0 + 2 * t1 + cs->K[2 * i + 9]); + t0 = tf_h(P[2], cs->S, cs->ksize); + t1 = tf_h(LR(P[3], 8), cs->S, cs->ksize); + P[0] = RR(P[0] ^ (t0 + t1 + cs->K[2 * i + 10]), 1); + P[1] = LR(P[1], 1) ^ (t0 + 2 * t1 + cs->K[2 * i + 11]); + } + P[2] ^= cs->K[4]; + P[3] ^= cs->K[5]; + P[0] ^= cs->K[6]; + P[1] ^= cs->K[7]; + AV_WL32(dst, P[2]); + AV_WL32(dst + 4, P[3]); + AV_WL32(dst + 8, P[0]); + AV_WL32(dst + 12, P[1]); +} + +static void twofish_decrypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src, uint8_t *iv) +{ + uint32_t P[4], t0, t1; + int i; + P[2] = AV_RL32(src) ^ cs->K[4]; + P[3] = AV_RL32(src + 4) ^ cs->K[5]; + P[0] = AV_RL32(src + 8) ^ cs->K[6]; + P[1] = AV_RL32(src + 12) ^ cs->K[7]; + for (i = 15; i >= 0; i -= 2) { + t0 = tf_h(P[2], cs->S, cs->ksize); + t1 = tf_h(LR(P[3], 8), cs->S, cs->ksize); + P[0] = LR(P[0], 1) ^ (t0 + t1 + cs->K[2 * i + 8]); + P[1] = RR(P[1] ^ (t0 + 2 * t1 + cs->K[2 * i + 9]), 1); + t0 = tf_h(P[0], cs->S, cs->ksize); + t1 = tf_h(LR(P[1], 8), cs->S, cs->ksize); + P[2] = LR(P[2], 1) ^ (t0 + t1 + cs->K[2 * i + 6]); + P[3] = RR(P[3] ^ (t0 + 2 * t1 + cs->K[2 * i + 7]), 1); + } + P[0] ^= cs->K[0]; + P[1] ^= cs->K[1]; + P[2] ^= cs->K[2]; + P[3] ^= cs->K[3]; + if (iv) { + P[0] ^= AV_RL32(iv); + P[1] ^= AV_RL32(iv + 4); + P[2] ^= AV_RL32(iv + 8); + P[3] ^= AV_RL32(iv + 12); + memcpy(iv, src, 16); + } + AV_WL32(dst, P[2]); + AV_WL32(dst + 4, P[3]); + AV_WL32(dst + 8, P[0]); + AV_WL32(dst + 12, P[1]); +} + +av_cold int av_twofish_init(AVTWOFISH *cs, const uint8_t *key, int key_bits) +{ + int i; + uint8_t keypad[32]; + uint32_t Key[8], Me[4], Mo[4], A, B; + const uint32_t rho = 0x01010101; + if (key_bits < 0) + return -1; + if (key_bits <= 128) { + cs->ksize = 2; + } else if (key_bits <= 192) { + cs->ksize = 3; + } else { + cs->ksize = 4; + } + memset(keypad, 0, sizeof(keypad)); + if (key_bits <= 256) { + memcpy(keypad, key, key_bits >> 3); + } else { + memcpy(keypad, key, 32); + } + for (i = 0; i < 2 * cs->ksize ; i++) + Key[i] = AV_RL32(keypad + 4 * i); + for (i = 0; i < cs->ksize; i++) { + Me[i] = Key[2 * i]; + Mo[i] = Key[2 * i + 1]; + cs->S[cs->ksize - i - 1] = tf_RS(Me[i], Mo[i]); + } + for (i = 0; i < 20; i++) { + A = tf_h((2 * i) * rho, Me, cs->ksize); + B = tf_h((2 * i + 1) * rho, Mo, cs->ksize); + B = LR(B, 8); + cs->K[2 * i] = A + B; + cs->K[2 * i + 1] = LR((A + (2 * B)), 9); + } + if (cs->ksize << 6 != key_bits) { + return 1; + } else { + return 0; + } +} + +void av_twofish_crypt(AVTWOFISH *cs, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt) +{ + int i; + while (count--) { + if (decrypt) { + twofish_decrypt(cs, dst, src, iv); + } else { + if (iv) { + for (i = 0; i < 16; i++) + dst[i] = src[i] ^ iv[i]; + twofish_encrypt(cs, dst, dst); + memcpy(iv, dst, 16); + } else { + twofish_encrypt(cs, dst, src); + } + } + src = src + 16; + dst = dst + 16; + } +} + +#ifdef TEST +#include<stdio.h> +#include<stdlib.h> +#include"log.h" + +int main(int argc, char *argv[]) +{ + uint8_t Key[32] = {0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10, 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff + }; + const uint8_t rct[6][16] = { + {0x9f, 0x58, 0x9f, 0x5c, 0xf6, 0x12, 0x2c, 0x32, 0xb6, 0xbf, 0xec, 0x2f, 0x2a, 0xe8, 0xc3, 0x5a}, + {0xcf, 0xd1, 0xd2, 0xe5, 0xa9, 0xbe, 0x9c, 0xdf, 0x50, 0x1f, 0x13, 0xb8, 0x92, 0xbd, 0x22, 0x48}, + {0x37, 0x52, 0x7b, 0xe0, 0x05, 0x23, 0x34, 0xb8, 0x9f, 0x0c, 0xfc, 0xca, 0xe8, 0x7c, 0xfa, 0x20}, + {0x5d, 0x9d, 0x4e, 0xef, 0xfa, 0x91, 0x51, 0x57, 0x55, 0x24, 0xf1, 0x15, 0x81, 0x5a, 0x12, 0xe0}, + {0xe7, 0x54, 0x49, 0x21, 0x2b, 0xee, 0xf9, 0xf4, 0xa3, 0x90, 0xbd, 0x86, 0x0a, 0x64, 0x09, 0x41}, + {0x37, 0xfe, 0x26, 0xff, 0x1c, 0xf6, 0x61, 0x75, 0xf5, 0xdd, 0xf4, 0xc3, 0x3b, 0x97, 0xa2, 0x05} + }; + uint8_t temp[32], iv[16], rpt[32] = {0}; + const int kbits[3] = {128, 192, 256}; + int i, j, err = 0; + AVTWOFISH *cs; + cs = av_twofish_alloc(); + if (!cs) + return 1; + for (j = 1; j < 3; j++) { + av_twofish_init(cs, Key, kbits[j]); + av_twofish_crypt(cs, temp, rpt, 1, NULL, 0); + for (i = 0; i < 16; i++) { + if (rct[j][i] != temp[i]) { + av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[j][i], temp[i]); + err = 1; + } + } + av_twofish_crypt(cs, temp, rct[j], 1, NULL, 1); + for (i = 0; i < 16; i++) { + if (rpt[i] != temp[i]) { + av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]); + err = 1; + } + } + } + for (j = 0; j < 3; j++) { + memset(Key, 0, sizeof(Key)); + memset(rpt, 0, sizeof(rpt)); + for (i = 1; i < 50; i++) { + av_twofish_init(cs, Key, kbits[j]); + av_twofish_crypt(cs, temp, rpt, 1, NULL, 0); + memcpy(Key+16,Key,(kbits[j]-128) >> 3); + memcpy(Key,rpt,16); + memcpy(rpt,temp,16); + } + for (i = 0; i < 16; i++) { + if (rct[3 + j][i] != temp[i]) { + av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rct[3 + j][i], temp[i]); + err = 1; + } + } + } + memset(rpt, 0, sizeof(rpt)); + memcpy(iv, "HALLO123HALLO123", 16); + av_twofish_crypt(cs, temp, rpt, 2, iv, 0); + memcpy(iv, "HALLO123HALLO123", 16); + av_twofish_crypt(cs, temp, temp, 2, iv, 1); + for (i = 0; i < 32; i++) { + if (rpt[i] != temp[i]) { + av_log(NULL, AV_LOG_ERROR, "%d %02x %02x\n", i, rpt[i], temp[i]); + err = 1; + } + } + av_free(cs); + return err; +} +#endif diff --git a/libavutil/twofish.h b/libavutil/twofish.h new file mode 100644 index 0000000000..813cfecdf8 --- /dev/null +++ b/libavutil/twofish.h @@ -0,0 +1,70 @@ +/* + * An implementation of the TwoFish algorithm + * Copyright (c) 2015 Supraja Meedinti + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVUTIL_TWOFISH_H +#define AVUTIL_TWOFISH_H + +#include <stdint.h> + + +/** + * @file + * @brief Public header for libavutil TWOFISH algorithm + * @defgroup lavu_twofish TWOFISH + * @ingroup lavu_crypto + * @{ + */ + +extern const int av_twofish_size; + +struct AVTWOFISH; + +/** + * Allocate an AVTWOFISH context + * To free the struct: av_free(ptr) + */ +struct AVTWOFISH *av_twofish_alloc(void); + +/** + * Initialize an AVTWOFISH context. + * + * @param ctx an AVTWOFISH context + * @param key a key of size ranging from 1 to 32 bytes used for encryption/decryption + * @param key_bits number of keybits: 128, 192, 256 If less than the required, padded with zeroes to nearest valid value; return value is 0 if key_bits is 128/192/256, -1 if less than 0, 1 otherwise + */ +int av_twofish_init(struct AVTWOFISH *ctx, const uint8_t *key, int key_bits); + +/** + * Encrypt or decrypt a buffer using a previously initialized context + * + * @param ctx an AVTWOFISH context + * @param dst destination array, can be equal to src + * @param src source array, can be equal to dst + * @param count number of 16 byte blocks + * @paran iv initialization vector for CBC mode, NULL for ECB mode + * @param decrypt 0 for encryption, 1 for decryption + */ +void av_twofish_crypt(struct AVTWOFISH *ctx, uint8_t *dst, const uint8_t *src, int count, uint8_t* iv, int decrypt); + +/** + * @} + */ +#endif /* AVUTIL_TWOFISH_H */ |