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ADD: a TEA crypto algorithm implemention.

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This commit is contained in:
iceman1001 2015-12-09 14:57:16 +01:00
parent f74d0b89a2
commit 0a886a1d1b
3 changed files with 114 additions and 9 deletions
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19
client/Makefile
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@ -81,14 +81,14 @@ CORESRCS = uart.c \
CMDSRCS = nonce2key/crapto1.c\
nonce2key/crypto1.c\
nonce2key/nonce2key.c\
loclass/cipher.c \
loclass/cipherutils.c \
loclass/des.c \
loclass/ikeys.c \
loclass/elite_crack.c\
loclass/fileutils.c\
nonce2key/crypto1.c\
nonce2key/nonce2key.c\
loclass/cipher.c \
loclass/cipherutils.c \
loclass/des.c \
loclass/ikeys.c \
loclass/elite_crack.c\
loclass/fileutils.c\
mifarehost.c\
crc.c \
crc16.c \
@ -109,7 +109,7 @@ CMDSRCS = nonce2key/crapto1.c\
cmdhficlass.c \
cmdhfmf.c \
cmdhfmfu.c \
cmdhfmfhard.c \
cmdhfmfhard.c \
cmdhfmfdes.c \
cmdhftopaz.c \
cmdhw.c \
@ -140,6 +140,7 @@ cmdhfmfhard.c \
reveng/model.c\
reveng/poly.c\
reveng/getopt.c\
tea.c\
ZLIBSRCS = deflate.c adler32.c trees.c zutil.c inflate.c inffast.c inftrees.c

86
common/tea.c Normal file
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@ -0,0 +1,86 @@
//-----------------------------------------------------------------------------
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Generic TEA crypto code.
// ref: http://143.53.36.235:8080/source.htm#ansi
//-----------------------------------------------------------------------------
#include "tea.h"
#define ROUNDS 32
#define DELTA 0x9E3779B9
#define SUM 0xC6EF3720
#define SWAPENDIAN(x)\
(x = (x >> 8 & 0xff00ff) | (x & 0xff00ff) << 8, x = x >> 16 | x << 16)
void tea_encrypt(uint8_t *v, uint8_t *key) {
uint32_t a=0,b=0,c=0,d=0,y=0,z=0;
uint32_t sum = 0;
uint8_t n = ROUNDS;
//key
a = bytes_to_num(key, 4);
b = bytes_to_num(key+4, 4);
c = bytes_to_num(key+8, 4);
d = bytes_to_num(key+12, 4);
//input
y = bytes_to_num(v, 4);
z = bytes_to_num(v+4, 4);
// SWAPENDIAN(a);
// SWAPENDIAN(b);
// SWAPENDIAN(c);
// SWAPENDIAN(d);
// SWAPENDIAN(y);
// SWAPENDIAN(z);
while ( n-- > 0 ) {
sum += DELTA;
y += ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b);
z += ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
}
// SWAPENDIAN(y);
// SWAPENDIAN(z);
num_to_bytes(y, 4, v);
num_to_bytes(z, 4, v+4);
}
void tea_decrypt(uint8_t *v, uint8_t *key) {
uint32_t a=0,b=0,c=0,d=0,y=0,z=0;
uint32_t sum = SUM;
uint8_t n = ROUNDS;
//key
a = bytes_to_num(key, 4);
b = bytes_to_num(key+4, 4);
c = bytes_to_num(key+8, 4);
d = bytes_to_num(key+12, 4);
//input
y = bytes_to_num(v, 4);
z = bytes_to_num(v+4, 4);
// SWAPENDIAN(a);
// SWAPENDIAN(b);
// SWAPENDIAN(c);
// SWAPENDIAN(d);
// SWAPENDIAN(y);
// SWAPENDIAN(z);
/* sum = delta<<5, in general sum = delta * n */
while ( n-- > 0 ) {
z -= ((y << 4) + c) ^ (y + sum) ^ ((y >> 5) + d);
y -= ((z << 4) + a) ^ (z + sum) ^ ((z >> 5) + b);
sum -= DELTA;
}
// SWAPENDIAN(y);
// SWAPENDIAN(z);
num_to_bytes(y, 4, v);
num_to_bytes(z, 4, v+4);
}

18
common/tea.h Normal file
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@ -0,0 +1,18 @@
//-----------------------------------------------------------------------------
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Generic TEA crypto code.
// ref: http://143.53.36.235:8080/source.htm#ansi
//-----------------------------------------------------------------------------
#ifndef __TEA_H
#define __TEA_H
#include "util.h"
#include <stdint.h>
#include <stddef.h>
void tea_encrypt(uint8_t *v, uint8_t *key);
void tea_decrypt(uint8_t *v, uint8_t *key);
#endif /* __TEA_H */