#include <avr/pgmspace.h>
#if NESSIE_COMPAT
-#define SKIPJACK_CNT_BIG 0
-#else
#define SKIPJACK_CNT_BIG 1
+#else
+#define SKIPJACK_CNT_BIG 0
#endif
#if SKIPJACK_CNT_BIG
/*****************************************************************************/
uint16_t skipjack_g(uint16_t g, uint8_t k, uint8_t *key){
- #define G1 (((uint8_t*)&g)[0])
- #define G2 (((uint8_t*)&g)[1])
+ #define G1 (((uint8_t*)&g)[1])
+ #define G2 (((uint8_t*)&g)[0])
/* this could also be rolled up */
- G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+0)%10]]));
- G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+1)%10]]));
- G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+2)%10]]));
- G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+3)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[9-(4*k+0)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[9-(4*k+1)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[9-(4*k+2)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[9-(4*k+3)%10]]));
return g;
}
// #define G1 (((uint8_t)&g)[1])
// #define G2 (((uint8_t)&g)[0])
/* this could also be rolled up */
- G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+3)%10]]));
- G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+2)%10]]));
- G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+1)%10]]));
- G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+0)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[9-(4*k+3)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[9-(4*k+2)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[9-(4*k+1)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[9-(4*k+0)%10]]));
return g;
}
void skipjack_a(uint16_t* w, uint8_t k, uint8_t* key){
uint16_t t;
-
- t = w[3];
- w[3] = w[2];
- w[2] = w[1];
- w[1] = skipjack_g(w[0],k-1,key);
- w[0] = t ^ w[1] ^ (((uint16_t)k)SKIPJACK_CNT_SHIFT);
+ t = w[0];
+ w[0] = w[1];
+ w[1] = w[2];
+ w[2] = skipjack_g(w[3],k,key);
+ w[3] = t ^ w[2] ^ (((uint16_t)k+1)SKIPJACK_CNT_SHIFT);
}
/*****************************************************************************/
void skipjack_a_inv(uint16_t* w, uint8_t k, uint8_t* key){
uint16_t t;
- t = w[0] ^ w[1];
- w[0] = skipjack_g_inv(w[1],k-1,key);
- w[1] = w[2];
- w[2] = w[3];
- w[3] = t ^ (((uint16_t)k)SKIPJACK_CNT_SHIFT);
+ t = w[3] ^ w[2];
+ w[3] = skipjack_g_inv(w[2],k,key);
+ w[2] = w[1];
+ w[1] = w[0];
+ w[0] = t ^ (((uint16_t)k+1)SKIPJACK_CNT_SHIFT);
}
/*****************************************************************************/
void skipjack_b(uint16_t* w, uint8_t k, uint8_t* key){
uint16_t t;
- t = w[0];
- w[0] = w[3];
- w[3] = w[2];
- w[2] = t ^ (((uint16_t)k)SKIPJACK_CNT_SHIFT) ^ w[1];
- w[1] = skipjack_g(t,k-1,key);
+ t = w[3];
+ w[3] = w[0];
+ w[0] = w[1];
+ w[1] = t ^ (((uint16_t)k+1)SKIPJACK_CNT_SHIFT) ^ w[2];
+ w[2] = skipjack_g(t,k,key);
}
/*****************************************************************************/
void skipjack_b_inv(uint16_t* w, uint8_t k, uint8_t* key){
uint16_t t;
- t = w[2];
- w[2] = w[3];
- w[3] = w[0];
- w[0] = skipjack_g_inv(w[1],k-1,key);
- w[1] = w[0] ^ t ^ (((uint16_t)k)SKIPJACK_CNT_SHIFT);
+ t = w[1];
+ w[1] = w[0];
+ w[0] = w[3];
+ w[3] = skipjack_g_inv(w[2],k,key);
+ w[2] = w[3] ^ t ^ (((uint16_t)k+1)SKIPJACK_CNT_SHIFT);
}
/*****************************************************************************/
uint8_t k;
for(k=0; k<32; ++k){
if(k & 0x08){
- skipjack_b((uint16_t*)block, k+1, key);
+ skipjack_b((uint16_t*)block, k, key);
} else {
- skipjack_a((uint16_t*)block, k+1, key);
+ skipjack_a((uint16_t*)block, k, key);
}
}
}
-
/*****************************************************************************/
/**
* block is 64 bits (=8 bytes) in size, key is 80 bits (=10 bytes) in size.
int8_t k;
for(k=31; k>=0; --k){
if(k & 0x08){
- skipjack_b_inv((uint16_t*)block, k+1, key);
+ skipjack_b_inv((uint16_t*)block, k, key);
} else {
- skipjack_a_inv((uint16_t*)block, k+1, key);
+ skipjack_a_inv((uint16_t*)block, k, key);
}
}
}
--- /dev/null
+/* skipjack.c */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ *
+ *
+ *
+ *
+ *
+ *
+ */
+
+
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+
+#define NO_FIX 1
+
+#if NESSIE_COMPAT
+#define SKIPJACK_CNT_BIG 0
+#else
+#define SKIPJACK_CNT_BIG 1
+#endif
+
+#if SKIPJACK_CNT_BIG
+ #define SKIPJACK_CNT_SHIFT <<8
+#else
+ #define SKIPJACK_CNT_SHIFT
+#endif
+
+/*****************************************************************************/
+
+const uint8_t skipjack_ftable[] PROGMEM ={
+ 0xa3, 0xd7, 0x09, 0x83, 0xf8, 0x48, 0xf6, 0xf4,
+ 0xb3, 0x21, 0x15, 0x78, 0x99, 0xb1, 0xaf, 0xf9,
+ 0xe7, 0x2d, 0x4d, 0x8a, 0xce, 0x4c, 0xca, 0x2e,
+ 0x52, 0x95, 0xd9, 0x1e, 0x4e, 0x38, 0x44, 0x28,
+ 0x0a, 0xdf, 0x02, 0xa0, 0x17, 0xf1, 0x60, 0x68,
+ 0x12, 0xb7, 0x7a, 0xc3, 0xe9, 0xfa, 0x3d, 0x53,
+ 0x96, 0x84, 0x6b, 0xba, 0xf2, 0x63, 0x9a, 0x19,
+ 0x7c, 0xae, 0xe5, 0xf5, 0xf7, 0x16, 0x6a, 0xa2,
+ 0x39, 0xb6, 0x7b, 0x0f, 0xc1, 0x93, 0x81, 0x1b,
+ 0xee, 0xb4, 0x1a, 0xea, 0xd0, 0x91, 0x2f, 0xb8,
+ 0x55, 0xb9, 0xda, 0x85, 0x3f, 0x41, 0xbf, 0xe0,
+ 0x5a, 0x58, 0x80, 0x5f, 0x66, 0x0b, 0xd8, 0x90,
+ 0x35, 0xd5, 0xc0, 0xa7, 0x33, 0x06, 0x65, 0x69,
+ 0x45, 0x00, 0x94, 0x56, 0x6d, 0x98, 0x9b, 0x76,
+ 0x97, 0xfc, 0xb2, 0xc2, 0xb0, 0xfe, 0xdb, 0x20,
+ 0xe1, 0xeb, 0xd6, 0xe4, 0xdd, 0x47, 0x4a, 0x1d,
+ 0x42, 0xed, 0x9e, 0x6e, 0x49, 0x3c, 0xcd, 0x43,
+ 0x27, 0xd2, 0x07, 0xd4, 0xde, 0xc7, 0x67, 0x18,
+ 0x89, 0xcb, 0x30, 0x1f, 0x8d, 0xc6, 0x8f, 0xaa,
+ 0xc8, 0x74, 0xdc, 0xc9, 0x5d, 0x5c, 0x31, 0xa4,
+ 0x70, 0x88, 0x61, 0x2c, 0x9f, 0x0d, 0x2b, 0x87,
+ 0x50, 0x82, 0x54, 0x64, 0x26, 0x7d, 0x03, 0x40,
+ 0x34, 0x4b, 0x1c, 0x73, 0xd1, 0xc4, 0xfd, 0x3b,
+ 0xcc, 0xfb, 0x7f, 0xab, 0xe6, 0x3e, 0x5b, 0xa5,
+ 0xad, 0x04, 0x23, 0x9c, 0x14, 0x51, 0x22, 0xf0,
+ 0x29, 0x79, 0x71, 0x7e, 0xff, 0x8c, 0x0e, 0xe2,
+ 0x0c, 0xef, 0xbc, 0x72, 0x75, 0x6f, 0x37, 0xa1,
+ 0xec, 0xd3, 0x8e, 0x62, 0x8b, 0x86, 0x10, 0xe8,
+ 0x08, 0x77, 0x11, 0xbe, 0x92, 0x4f, 0x24, 0xc5,
+ 0x32, 0x36, 0x9d, 0xcf, 0xf3, 0xa6, 0xbb, 0xac,
+ 0x5e, 0x6c, 0xa9, 0x13, 0x57, 0x25, 0xb5, 0xe3,
+ 0xbd, 0xa8, 0x3a, 0x01, 0x05, 0x59, 0x2a, 0x46
+};
+
+/*****************************************************************************/
+
+uint16_t skipjack_g(uint16_t g, uint8_t k, uint8_t *key){
+ #define G1 (((uint8_t*)&g)[0])
+ #define G2 (((uint8_t*)&g)[1])
+ /* this could also be rolled up */
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+0)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+1)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+2)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+3)%10]]));
+ return g;
+}
+
+/*****************************************************************************/
+
+uint16_t skipjack_g_inv(uint16_t g, uint8_t k, uint8_t *key){
+// #define G1 (((uint8_t)&g)[1])
+// #define G2 (((uint8_t)&g)[0])
+ /* this could also be rolled up */
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+3)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+2)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+1)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+0)%10]]));
+ return g;
+}
+
+/*****************************************************************************/
+
+void skipjack_a(uint16_t* w, uint8_t k, uint8_t* key){
+ uint16_t t;
+
+ t = w[3];
+ w[3] = w[2];
+ w[2] = w[1];
+ w[1] = skipjack_g(w[0],k,key);
+ w[0] = t ^ w[1] ^ (((uint16_t)k+1)SKIPJACK_CNT_SHIFT);
+}
+
+/*****************************************************************************/
+
+void skipjack_a_inv(uint16_t* w, uint8_t k, uint8_t* key){
+ uint16_t t;
+ t = w[0] ^ w[1];
+ w[0] = skipjack_g_inv(w[1],k,key);
+ w[1] = w[2];
+ w[2] = w[3];
+ w[3] = t ^ (((uint16_t)k+1)SKIPJACK_CNT_SHIFT);
+}
+
+/*****************************************************************************/
+
+void skipjack_b(uint16_t* w, uint8_t k, uint8_t* key){
+ uint16_t t;
+ t = w[0];
+ w[0] = w[3];
+ w[3] = w[2];
+ w[2] = t ^ (((uint16_t)k+1)SKIPJACK_CNT_SHIFT) ^ w[1];
+ w[1] = skipjack_g(t,k,key);
+}
+
+/*****************************************************************************/
+
+void skipjack_b_inv(uint16_t* w, uint8_t k, uint8_t* key){
+ uint16_t t;
+ t = w[2];
+ w[2] = w[3];
+ w[3] = w[0];
+ w[0] = skipjack_g_inv(w[1],k,key);
+ w[1] = w[0] ^ t ^ (((uint16_t)k+1)SKIPJACK_CNT_SHIFT);
+}
+
+/*****************************************************************************/
+/**
+ * block is 64 bits (=8 bytes) in size, key is 80 bits (=10 bytes) in size.
+ *
+ */
+#if NO_FIX
+void skipjack_enc(void* block, void* key){
+ uint8_t k;
+ for(k=0; k<32; ++k){
+ if(k & 0x08){
+ skipjack_b((uint16_t*)block, k, key);
+ } else {
+ skipjack_a((uint16_t*)block, k, key);
+ }
+ }
+}
+#else
+void skipjack_enc(void* block, void* key){
+ uint8_t k;
+ uint8_t buffer[8], local_key[10];
+ for(k=0; k<8; ++k){
+ buffer[k] = ((uint8_t*)block)[7-k];
+ }
+ for(k=0; k<10; ++k){
+ local_key[k] = ((uint8_t*)key)[9-k];
+ }
+ for(k=0; k<32; ++k){
+ if(k & 0x08){
+ skipjack_b((uint16_t*)buffer, k, local_key);
+ } else {
+ skipjack_a((uint16_t*)buffer, k, local_key);
+ }
+ }
+ for(k=0; k<8; ++k){
+ ((uint8_t*)block)[7-k] = buffer[k];
+ }
+}
+#endif
+/*****************************************************************************/
+/**
+ * block is 64 bits (=8 bytes) in size, key is 80 bits (=10 bytes) in size.
+ *
+ */
+#if NO_FIX
+void skipjack_dec(void* block, void* key){
+ int8_t k;
+ for(k=31; k>=0; --k){
+ if(k & 0x08){
+ skipjack_b_inv((uint16_t*)block, k, key);
+ } else {
+ skipjack_a_inv((uint16_t*)block, k, key);
+ }
+ }
+}
+#else
+void skipjack_dec(void* block, void* key){
+ int8_t k;
+ uint8_t buffer[8], local_key[10];
+ for(k=0; k<8; ++k){
+ buffer[k] = ((uint8_t*)block)[7-k];
+ }
+ for(k=0; k<10; ++k){
+ local_key[k] = ((uint8_t*)key)[9-k];
+ }
+ for(k=31; k>=0; --k){
+ if(k & 0x08){
+ skipjack_b_inv((uint16_t*)buffer, k, local_key);
+ } else {
+ skipjack_a_inv((uint16_t*)buffer, k, local_key);
+ }
+ }
+ for(k=0; k<8; ++k){
+ ((uint8_t*)block)[7-k] = buffer[k];
+ }
+}
+
+#endif
+
+
+
+
+
projects / avr-crypto-lib.git / commitdiff