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authorlloyd <[email protected]>2008-11-08 19:46:52 +0000
committerlloyd <[email protected]>2008-11-08 19:46:52 +0000
commitf1c459725da56fd8ed5766e7779300182fa26bcf (patch)
tree32295cec92df1155563ae8a535dc695d6800d7f6 /src/block/safer/safer_sk.cpp
parent8dba7b5264403e781bbb86ff61850e4377dca7b9 (diff)
Split ciphers into block and stream ciphers. Move base class headers
Diffstat (limited to 'src/block/safer/safer_sk.cpp')
-rw-r--r--src/block/safer/safer_sk.cpp113
1 files changed, 113 insertions, 0 deletions
diff --git a/src/block/safer/safer_sk.cpp b/src/block/safer/safer_sk.cpp
new file mode 100644
index 000000000..639130714
--- /dev/null
+++ b/src/block/safer/safer_sk.cpp
@@ -0,0 +1,113 @@
+/*************************************************
+* SAFER-SK Source File *
+* (C) 1999-2007 Jack Lloyd *
+*************************************************/
+
+#include <botan/safer_sk.h>
+#include <botan/bit_ops.h>
+#include <botan/parsing.h>
+#include <botan/rotate.h>
+
+namespace Botan {
+
+/*************************************************
+* SAFER-SK Encryption *
+*************************************************/
+void SAFER_SK::enc(const byte in[], byte out[]) const
+ {
+ byte A = in[0], B = in[1], C = in[2], D = in[3],
+ E = in[4], F = in[5], G = in[6], H = in[7], X, Y;
+ for(u32bit j = 0; j != 16*ROUNDS; j += 16)
+ {
+ A = EXP[A ^ EK[j ]]; B = LOG[B + EK[j+1]];
+ C = LOG[C + EK[j+2]]; D = EXP[D ^ EK[j+3]];
+ E = EXP[E ^ EK[j+4]]; F = LOG[F + EK[j+5]];
+ G = LOG[G + EK[j+6]]; H = EXP[H ^ EK[j+7]];
+ A += EK[j+ 8]; B ^= EK[j+ 9]; C ^= EK[j+10]; D += EK[j+11];
+ E += EK[j+12]; F ^= EK[j+13]; G ^= EK[j+14]; H += EK[j+15];
+ B += A; D += C; F += E; H += G; A += B; C += D; E += F; G += H;
+ C += A; G += E; D += B; H += F; A += C; E += G; B += D; F += H;
+ H += D; Y = D + H; D = B + F; X = B + D; B = A + E;
+ A += B; F = C + G; E = C + F; C = X; G = Y;
+ }
+ out[0] = A ^ EK[16*ROUNDS+0]; out[1] = B + EK[16*ROUNDS+1];
+ out[2] = C + EK[16*ROUNDS+2]; out[3] = D ^ EK[16*ROUNDS+3];
+ out[4] = E ^ EK[16*ROUNDS+4]; out[5] = F + EK[16*ROUNDS+5];
+ out[6] = G + EK[16*ROUNDS+6]; out[7] = H ^ EK[16*ROUNDS+7];
+ }
+
+/*************************************************
+* SAFER-SK Decryption *
+*************************************************/
+void SAFER_SK::dec(const byte in[], byte out[]) const
+ {
+ byte A = in[0], B = in[1], C = in[2], D = in[3],
+ E = in[4], F = in[5], G = in[6], H = in[7];
+ A ^= EK[16*ROUNDS+0]; B -= EK[16*ROUNDS+1]; C -= EK[16*ROUNDS+2];
+ D ^= EK[16*ROUNDS+3]; E ^= EK[16*ROUNDS+4]; F -= EK[16*ROUNDS+5];
+ G -= EK[16*ROUNDS+6]; H ^= EK[16*ROUNDS+7];
+ for(s32bit j = 16*(ROUNDS-1); j >= 0; j -= 16)
+ {
+ byte T = E; E = B; B = C; C = T; T = F; F = D; D = G; G = T;
+ A -= E; B -= F; C -= G; D -= H; E -= A; F -= B; G -= C; H -= D;
+ A -= C; E -= G; B -= D; F -= H; C -= A; G -= E; D -= B; H -= F;
+ A -= B; C -= D; E -= F; G -= H; B -= A; D -= C; F -= E; H -= G;
+ A = LOG[A - EK[j+8 ] + 256]; B = EXP[B ^ EK[j+9 ]];
+ C = EXP[C ^ EK[j+10]]; D = LOG[D - EK[j+11] + 256];
+ E = LOG[E - EK[j+12] + 256]; F = EXP[F ^ EK[j+13]];
+ G = EXP[G ^ EK[j+14]]; H = LOG[H - EK[j+15] + 256];
+ A ^= EK[j+0]; B -= EK[j+1]; C -= EK[j+2]; D ^= EK[j+3];
+ E ^= EK[j+4]; F -= EK[j+5]; G -= EK[j+6]; H ^= EK[j+7];
+ }
+ out[0] = A; out[1] = B; out[2] = C; out[3] = D;
+ out[4] = E; out[5] = F; out[6] = G; out[7] = H;
+ }
+
+/*************************************************
+* SAFER-SK Key Schedule *
+*************************************************/
+void SAFER_SK::key(const byte key[], u32bit)
+ {
+ SecureBuffer<byte, 18> KB;
+
+ for(u32bit j = 0; j != 8; ++j)
+ {
+ KB[ 8] ^= KB[j] = rotate_left(key[j], 5);
+ KB[17] ^= KB[j+9] = EK[j] = key[j+8];
+ }
+ for(u32bit j = 0; j != ROUNDS; ++j)
+ {
+ for(u32bit k = 0; k != 18; ++k)
+ KB[k] = rotate_left(KB[k], 6);
+ for(u32bit k = 0; k != 16; ++k)
+ EK[16*j+k+8] = KB[KEY_INDEX[16*j+k]] + BIAS[16*j+k];
+ }
+ }
+
+/*************************************************
+* Return the name of this type *
+*************************************************/
+std::string SAFER_SK::name() const
+ {
+ return "SAFER-SK(" + to_string(ROUNDS) + ")";
+ }
+
+/*************************************************
+* Return a clone of this object *
+*************************************************/
+BlockCipher* SAFER_SK::clone() const
+ {
+ return new SAFER_SK(ROUNDS);
+ }
+
+/*************************************************
+* SAFER-SK Constructor *
+*************************************************/
+SAFER_SK::SAFER_SK(u32bit rounds) : BlockCipher(8, 16),
+ EK(16 * rounds + 8), ROUNDS(rounds)
+ {
+ if(ROUNDS > 13 || ROUNDS == 0)
+ throw Invalid_Argument(name() + ": Invalid number of rounds");
+ }
+
+}