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Diffstat (limited to 'old/botan/src/block/gost_28147/gost_28147.cpp')
| -rw-r--r-- | old/botan/src/block/gost_28147/gost_28147.cpp | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/old/botan/src/block/gost_28147/gost_28147.cpp b/old/botan/src/block/gost_28147/gost_28147.cpp new file mode 100644 index 0000000..bfd092c --- /dev/null +++ b/old/botan/src/block/gost_28147/gost_28147.cpp @@ -0,0 +1,139 @@ +/* +* GOST 28147-89 +* (C) 1999-2009 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/gost_28147.h> +#include <botan/loadstor.h> + +namespace Botan { + +byte GOST_28147_89_Params::sbox_entry(u32bit row, u32bit col) const + { + byte x = sboxes[4 * col + (row / 2)]; + + return (row % 2 == 0) ? (x >> 4) : (x & 0x0F); + } + +GOST_28147_89_Params::GOST_28147_89_Params(const std::string& n) : name(n) + { + // Encoded in the packed fromat from RFC 4357 + + // GostR3411_94_TestParamSet (OID 1.2.643.2.2.31.0) + static const byte GOST_R_3411_TEST_PARAMS[64] = { + 0x4E, 0x57, 0x64, 0xD1, 0xAB, 0x8D, 0xCB, 0xBF, 0x94, 0x1A, 0x7A, + 0x4D, 0x2C, 0xD1, 0x10, 0x10, 0xD6, 0xA0, 0x57, 0x35, 0x8D, 0x38, + 0xF2, 0xF7, 0x0F, 0x49, 0xD1, 0x5A, 0xEA, 0x2F, 0x8D, 0x94, 0x62, + 0xEE, 0x43, 0x09, 0xB3, 0xF4, 0xA6, 0xA2, 0x18, 0xC6, 0x98, 0xE3, + 0xC1, 0x7C, 0xE5, 0x7E, 0x70, 0x6B, 0x09, 0x66, 0xF7, 0x02, 0x3C, + 0x8B, 0x55, 0x95, 0xBF, 0x28, 0x39, 0xB3, 0x2E, 0xCC }; + + // GostR3411-94-CryptoProParamSet (OID 1.2.643.2.2.31.1) + static const byte GOST_R_3411_CRYPTOPRO_PARAMS[64] = { + 0xA5, 0x74, 0x77, 0xD1, 0x4F, 0xFA, 0x66, 0xE3, 0x54, 0xC7, 0x42, + 0x4A, 0x60, 0xEC, 0xB4, 0x19, 0x82, 0x90, 0x9D, 0x75, 0x1D, 0x4F, + 0xC9, 0x0B, 0x3B, 0x12, 0x2F, 0x54, 0x79, 0x08, 0xA0, 0xAF, 0xD1, + 0x3E, 0x1A, 0x38, 0xC7, 0xB1, 0x81, 0xC6, 0xE6, 0x56, 0x05, 0x87, + 0x03, 0x25, 0xEB, 0xFE, 0x9C, 0x6D, 0xF8, 0x6D, 0x2E, 0xAB, 0xDE, + 0x20, 0xBA, 0x89, 0x3C, 0x92, 0xF8, 0xD3, 0x53, 0xBC }; + + if(name == "R3411_94_TestParam") + sboxes = GOST_R_3411_TEST_PARAMS; + else if(name == "R3411_CryptoPro") + sboxes = GOST_R_3411_CRYPTOPRO_PARAMS; + else + throw Invalid_Argument("GOST_28147_89_Params: Unknown " + name); + } + +/* +* GOST Constructor +*/ +GOST_28147_89::GOST_28147_89(const GOST_28147_89_Params& param) : + BlockCipher(8, 32) + { + // Convert the parallel 4x4 sboxes into larger word-based sboxes + for(size_t i = 0; i != 4; ++i) + for(size_t j = 0; j != 256; ++j) + { + u32bit T = (param.sbox_entry(2*i , j % 16)) | + (param.sbox_entry(2*i+1, j / 16) << 4); + SBOX[256*i+j] = rotate_left(T, (11+8*i) % 32); + } + } + +/* +* Two rounds of GOST +*/ +#define GOST_2ROUND(N1, N2, R1, R2) \ + do { \ + u32bit T0 = N1 + EK[R1]; \ + N2 ^= SBOX[get_byte(3, T0)] | \ + SBOX[get_byte(2, T0)+256] | \ + SBOX[get_byte(1, T0)+512] | \ + SBOX[get_byte(0, T0)+768]; \ + \ + u32bit T1 = N2 + EK[R2]; \ + N1 ^= SBOX[get_byte(3, T1)] | \ + SBOX[get_byte(2, T1)+256] | \ + SBOX[get_byte(1, T1)+512] | \ + SBOX[get_byte(0, T1)+768]; \ + } while(0) + +/* +* GOST Encryption +*/ +void GOST_28147_89::enc(const byte in[], byte out[]) const + { + u32bit N1 = load_le<u32bit>(in, 0), N2 = load_le<u32bit>(in, 1); + + for(size_t i = 0; i != 3; ++i) + { + GOST_2ROUND(N1, N2, 0, 1); + GOST_2ROUND(N1, N2, 2, 3); + GOST_2ROUND(N1, N2, 4, 5); + GOST_2ROUND(N1, N2, 6, 7); + } + + GOST_2ROUND(N1, N2, 7, 6); + GOST_2ROUND(N1, N2, 5, 4); + GOST_2ROUND(N1, N2, 3, 2); + GOST_2ROUND(N1, N2, 1, 0); + + store_le(out, N2, N1); + } + +/* +* GOST Decryption +*/ +void GOST_28147_89::dec(const byte in[], byte out[]) const + { + u32bit N1 = load_le<u32bit>(in, 0), N2 = load_le<u32bit>(in, 1); + + GOST_2ROUND(N1, N2, 0, 1); + GOST_2ROUND(N1, N2, 2, 3); + GOST_2ROUND(N1, N2, 4, 5); + GOST_2ROUND(N1, N2, 6, 7); + + for(size_t i = 0; i != 3; ++i) + { + GOST_2ROUND(N1, N2, 7, 6); + GOST_2ROUND(N1, N2, 5, 4); + GOST_2ROUND(N1, N2, 3, 2); + GOST_2ROUND(N1, N2, 1, 0); + } + + store_le(out, N2, N1); + } + +/* +* GOST Key Schedule +*/ +void GOST_28147_89::key_schedule(const byte key[], u32bit) + { + for(u32bit j = 0; j != 8; ++j) + EK[j] = load_le<u32bit>(key, j); + } + +} |