This library implements some hash and cryptographic algorithms.
Dependents: ES_CW2_Starter_JIN EMBEDDED_CW2 EMBEDDED_CW2_Final Spinnybois ... more
Fork of Crypto by
cipher/DES.cpp
- Committer:
- feb11
- Date:
- 2013-09-14
- Revision:
- 8:a090264e9b2d
- Parent:
- 7:2dbbdfb08123
File content as of revision 8:a090264e9b2d:
#include "DES.h" #include <string.h> static const uint8_t S1[] = { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 }; static const uint8_t S2[] = { 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 }; static const uint8_t S3[] = { 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 }; static const uint8_t S4[] = { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 }; static const uint8_t S5[] = { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 }; static const uint8_t S6[] = { 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 }; static const uint8_t S7[] = { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 }; static const uint8_t S8[] = { 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 }; static void pc1(uint8_t *k, uint8_t *key) { memset(k, 0, 7); for(int i = 0; i < 8; ++i) { k[0] = (k[0] << 1) | (key[i] & 0x01); k[1] = (k[1] << 1) | ((key[i] & 0x02) >> 1); k[2] = (k[2] << 1) | ((key[i] & 0x04) >> 2); } for(int i = 0 ; i < 4; ++i) { k[3] = (k[3] << 1) | ((key[4+i] & 0x40) >> 6); k[4] = (k[4] << 1) | ((key[4+i] & 0x20) >> 5); k[5] = (k[5] << 1) | ((key[4+i] & 0x10) >> 4); k[6] = (k[6] << 1) | ((key[i] & 0x08) >> 3); } for(int i = 0 ; i < 4; ++i) { k[3] = (k[3] << 1) | ((key[4+i] & 0x08) >> 3); k[4] = (k[4] << 1) | ((key[i] & 0x40) >> 6); k[5] = (k[5] << 1) | ((key[i] & 0x20) >> 5); k[6] = (k[6] << 1) | ((key[i] & 0x10) >> 4); } } static void leftShift(uint8_t *k) { uint8_t tmp = k[0] & 0x01, tmp2 = k[3] & 0x10; k[0] = (k[0] >> 1) | ((k[1] & 0x01) << 7); k[1] = (k[1] >> 1) | ((k[2] & 0x01) << 7); k[2] = (k[2] >> 1) | ((k[3] & 0x01) << 7); k[3] = ((k[3] & 0x0E) >> 1) | (tmp << 3) | ((k[3] & 0xE0) >> 1) | ((k[4] & 0x01) << 7); k[4] = (k[4] >> 1) | ((k[5] & 0x01) << 7); k[5] = (k[5] >> 1) | ((k[6] & 0x01) << 7); k[6] = (k[6] >> 1) | (tmp2 << 3); } void pc2(uint8_t *subKey, uint8_t *k) { subKey[0] = ((k[1] & 0x20) >> 5) | ((k[2] & 0x01) << 1) | (k[1] & 0x04) | ((k[2] & 0x80) >> 4) | ((k[0] & 0x01) << 4) | ((k[0] & 0x10) << 1) | ((k[0] & 0x04) << 4) | ((k[3] & 0x08) << 4); subKey[1] = ((k[1] & 0x40) >> 6) | ((k[0] & 0x20) >> 4) | ((k[2] & 0x10) >> 2) | ((k[1] & 0x02) << 2) | ((k[2] & 0x40) >> 2) | ((k[2] & 0x04) << 3) | ((k[1] & 0x08) << 3) | ((k[0] & 0x08) << 4); subKey[2] = ((k[3] & 0x02) >> 1) | ((k[0] & 0x80) >> 6) | ((k[1] & 0x80) >> 5) | ((k[0] & 0x40) >> 3) | ((k[3] & 0x04) << 2) | ((k[2] & 0x08) << 2) | ((k[1] & 0x10) << 2) | ((k[0] & 0x02) << 6); subKey[3] = (k[5] & 0x01) | ((k[6] & 0x08) >> 2) | ((k[3] & 0x40) >> 4) | ((k[4] & 0x10) >> 1) | ((k[5] & 0x40) >> 2) | ((k[6] & 0x40) >> 1) | ((k[3] & 0x20) << 1) | (k[4] & 0x80); subKey[4] = ((k[6] & 0x04) >> 2) | ((k[5] & 0x10) >> 3) | ((k[4] & 0x01) << 2) | ((k[5] & 0x80) >> 4) | ((k[5] & 0x08) << 1) | ((k[6] & 0x01) << 5) | (k[4] & 0x40) | (k[6] & 0x80); subKey[5] = ((k[4] & 0x02) >> 1) | ((k[6] & 0x10) >> 3) | ((k[5] & 0x20) >> 3) | ((k[5] & 0x02) << 2) | ((k[6] & 0x02) << 3) | ((k[4] & 0x08) << 2) | ((k[3] & 0x10) << 2) | (k[3] & 0x80); } static void initialPermutation(uint8_t *in) { uint8_t tmp[8]; memcpy(tmp, in, 8); for(int i = 0; i < 8; ++i) { tmp[4] = (tmp[4] << 1) | (in[i] & 0x01); tmp[5] = (tmp[5] << 1) | ((in[i] & 0x04) >> 2); tmp[6] = (tmp[6] << 1) | ((in[i] & 0x10) >> 4); tmp[7] = (tmp[7] << 1) | ((in[i] & 0x40) >> 6); tmp[0] = (tmp[0] << 1) | ((in[i] & 0x02) >> 1); tmp[1] = (tmp[1] << 1) | ((in[i] & 0x08) >> 3); tmp[2] = (tmp[2] << 1) | ((in[i] & 0x20) >> 5); tmp[3] = (tmp[3] << 1) | ((in[i] & 0x80) >> 7); } memcpy(in, tmp, 8); } static void invInitialPermutation(uint8_t *out) { uint8_t tmp[8]; memcpy(tmp, out , 8); for(int i = 3; i >= 0; --i) { out[0] = (out[0] << 2) | ((tmp[4+i] & 0x80) >> 7) | ((tmp[i] & 0x80) >> 6); out[1] = (out[1] << 2) | ((tmp[4+i] & 0x40) >> 6) | ((tmp[i] & 0x40) >> 5); out[2] = (out[2] << 2) | ((tmp[4+i] & 0x20) >> 5) | ((tmp[i] & 0x20) >> 4); out[3] = (out[3] << 2) | ((tmp[4+i] & 0x10) >> 4) | ((tmp[i] & 0x10) >> 3); out[4] = (out[4] << 2) | ((tmp[4+i] & 0x08) >> 3) | ((tmp[i] & 0x08) >> 2); out[5] = (out[5] << 2) | ((tmp[4+i] & 0x04) >> 2) | ((tmp[i] & 0x04) >> 1); out[6] = (out[6] << 2) | ((tmp[4+i] & 0x02) >> 1) | (tmp[i] & 0x02); out[7] = (out[7] << 2) | (tmp[4+i] & 0x01) | ((tmp[i] & 0x01) << 1); } } static void expand(uint8_t *e, uint8_t *r) { e[0] = ((r[3] & 0x80) >> 7) | ((r[0] & 0x1F) << 1) | ((r[0] & 0x18) << 3); e[1] = ((r[0] & 0xE0) >> 5) | ((r[1] & 0x01) << 3) | ((r[0] & 0x80) >> 3) | ((r[1] & 0x07) << 5); e[2] = ((r[1] & 0x18) >> 3) | ((r[1] & 0xF8) >> 1) | ((r[2] & 0x01) << 7); e[3] = ((r[1] & 0x80) >> 7) | ((r[2] & 0x1F) << 1) | ((r[2] & 0x18) << 3); e[4] = ((r[2] & 0xE0) >> 5) | ((r[3] & 0x01) << 3) | ((r[2] & 0x80) >> 3) | ((r[3] & 0x07) << 5); e[5] = ((r[3] & 0x18) >> 3) | ((r[3] & 0xF8) >> 1) | ((r[0] & 0x01) << 7); } static void permutation(uint8_t *r) { uint8_t buffer[4]; buffer[0] = ((r[1] & 0x80) >> 7) | ((r[0] & 0x40) >> 5) | ((r[2] & 0x08) >> 1) | ((r[2] & 0x10) >> 1) | (r[3] & 0x10) | ((r[1] & 0x08) << 2) | ((r[3] & 0x08) << 3) | ((r[2] & 0x01) << 7); buffer[1] = (r[0] & 0x01) | ((r[1] & 0x40) >> 5) | ((r[2] & 0x40) >> 4) | ((r[3] & 0x02) << 2) | (r[0] & 0x10) | ((r[2] & 0x02) << 4) | (r[3] & 0x40) | ((r[1] & 0x02) << 6); buffer[2] = ((r[0] & 0x02) >> 1) | ((r[0] & 0x80) >> 6) | ((r[2] & 0x80) >> 5) | ((r[1] & 0x20) >> 2) | ((r[3] & 0x80) >> 3) | ((r[3] & 0x04) << 3) | ((r[0] & 0x04) << 4) | ((r[1] & 0x01) << 7); buffer[3] = ((r[2] & 0x04) >> 2) | ((r[1] & 0x10) >> 3) | ((r[3] & 0x20) >> 3) | ((r[0] & 0x20) >> 2) | ((r[2] & 0x20) >> 1) | ((r[1] & 0x04) << 3) | ((r[0] & 0x08) << 3) | ((r[3] & 0x01) << 7); memcpy(r, buffer,4); } static void substitute(uint8_t *r, uint8_t *e) { int index = ((e[0] & 0x01) << 5) | ((e[0] & 0x02) << 2) | (e[0] & 0x04) | ((e[0] & 0x08) >> 2) | ((e[0] & 0x10) >> 4) | ((e[0] & 0x20) >> 1); int index2 = ((e[0] & 0x40) >> 1) | ((e[0] & 0x80) >> 4) | ((e[1] & 0x01) << 2) | (e[1] & 0x02) | ((e[1] & 0x04) >> 2) | ((e[1] & 0x08) << 1); r[0] = ((S2[index2] & 0x08) >> 3) | ((S2[index2] & 0x04) >> 1) | ((S2[index2] & 0x02) << 1) | ((S2[index2] & 0x01) << 3); r[0] <<= 4; r[0] |= ((S1[index] & 0x08) >> 3) | ((S1[index] & 0x04) >> 1) | ((S1[index] & 0x02) << 1) | ((S1[index] & 0x01) << 3); index = ((e[1] & 0x10) << 1) | ((e[1] & 0x20) >> 2) | ((e[1] & 0x40) >> 4) | ((e[1] & 0x80) >> 6) | (e[2] & 0x01) | ((e[2] & 0x02) << 3); index2 = ((e[2] & 0x04) << 3) | (e[2] & 0x08) | ((e[2] & 0x10) >> 2) | ((e[2] & 0x20) >> 4) | ((e[2] & 0x40) >> 6) | ((e[2] & 0x80) >> 3); r[1] = ((S4[index2] & 0x08) >> 3) | ((S4[index2] & 0x04) >> 1) | ((S4[index2] & 0x02) << 1) | ((S4[index2] & 0x01) << 3); r[1] <<= 4; r[1] |= ((S3[index] & 0x08) >> 3) | ((S3[index] & 0x04) >> 1) | ((S3[index] & 0x02) << 1) | ((S3[index] & 0x01) << 3); index = ((e[3] & 0x01) << 5) | ((e[3] & 0x02) << 2) | (e[3] & 0x04) | ((e[3] & 0x08) >> 2) | ((e[3] & 0x10) >> 4) | ((e[3] & 0x20) >> 1); index2 = ((e[3] & 0x40) >> 1) | ((e[3] & 0x80) >> 4) | ((e[4] & 0x01) << 2) | (e[4] & 0x02) | ((e[4] & 0x04) >> 2) | ((e[4] & 0x08) << 1); r[2] = ((S6[index2] & 0x08) >> 3) | ((S6[index2] & 0x04) >> 1) | ((S6[index2] & 0x02) << 1) | ((S6[index2] & 0x01) << 3); r[2] <<= 4; r[2] |= ((S5[index] & 0x08) >> 3) | ((S5[index] & 0x04) >> 1) | ((S5[index] & 0x02) << 1) | ((S5[index] & 0x01) << 3); index = ((e[4] & 0x10) << 1) | ((e[4] & 0x20) >> 2) | ((e[4] & 0x40) >> 4) | ((e[4] & 0x80) >> 6) | (e[5] & 0x01) | ((e[5] & 0x02) << 3); index2 = ((e[5] & 0x04) << 3) | (e[5] & 0x08) | ((e[5] & 0x10) >> 2) | ((e[5] & 0x20) >> 4) | ((e[5] & 0x40) >> 6) | ((e[5] & 0x80) >> 3); r[3] = ((S8[index2] & 0x08) >> 3) | ((S8[index2] & 0x04) >> 1) | ((S8[index2] & 0x02) << 1) | ((S8[index2] & 0x01) << 3); r[3] <<= 4; r[3] |= ((S7[index] & 0x08) >> 3) | ((S7[index] & 0x04) >> 1) | ((S7[index] & 0x02) << 1) | ((S7[index] & 0x01) << 3); } DES::DES(uint8_t *key): BlockCipher(8,ECB_MODE) { generateSubKeys(key); } DES::DES(uint8_t *key, uint8_t *iv): BlockCipher(8,CBC_MODE, iv) { generateSubKeys(key); } void DES::generateSubKeys(uint8_t *key) { for(int i = 0; i < 8; ++i) key[i] = ((key[i] & 0x01) << 7) | ((key[i] & 0x02) << 5) | ((key[i] & 0x04) << 3) | ((key[i] & 0x08) << 1) | ((key[i] & 0x10) >> 1) | ((key[i] & 0x20) >> 3) | ((key[i] & 0x40) >> 5) | ((key[i] & 0x80) >> 7); uint8_t workingKey[7]; pc1(workingKey, key); for(int i = 1; i <= 16; ++i) { leftShift(workingKey); if(i != 9 && i >= 3 && i <=15) leftShift(workingKey); pc2(subKeys[i-1], workingKey); } } void DES::encryptBlock(uint8_t *out, uint8_t *in) { uint8_t tmp[8]; memcpy(tmp, in, 8); for(int i = 0; i < 8; ++i) tmp[i] = ((tmp[i] & 0x01) << 7) | ((tmp[i] & 0x02) << 5) | ((tmp[i] & 0x04) << 3) | ((tmp[i] & 0x08) << 1) | ((tmp[i] & 0x10) >> 1) | ((tmp[i] & 0x20) >> 3) | ((tmp[i] & 0x40) >> 5) | ((tmp[i] & 0x80) >> 7); uint8_t l[4], r[4], tmpR[4], e[6]; initialPermutation(tmp); memcpy(l, tmp, 4); memcpy(r, &tmp[4], 4); for(int i = 0; i < 16; ++i) { memcpy(tmpR, r, 4); expand(e, r); for(int j = 0; j < 6; ++j) e[j] ^= subKeys[i][j]; substitute(r,e); permutation(r); for(int j = 0; j < 4; ++j) r[j] ^= l[j]; memcpy(l, tmpR, 4); } memcpy(tmp, r, 4); memcpy(&tmp[4], l, 4); invInitialPermutation(tmp); for(int i = 0; i < 8; ++i) { out[i] = ((tmp[i] & 0x01) << 3) | ((tmp[i] & 0x02) << 1) | ((tmp[i] & 0x04) >> 1) | ((tmp[i] & 0x08) >> 3); out[i] <<= 4; tmp[i] >>= 4; out[i] |= ((tmp[i] & 0x01) << 3) | ((tmp[i] & 0x02) << 1) | ((tmp[i] & 0x04) >> 1) | ((tmp[i] & 0x08) >> 3); } } void DES::decryptBlock(uint8_t *out, uint8_t *in) { uint8_t tmp[8]; memcpy(tmp, in, 8); for(int i = 0; i < 8; ++i) tmp[i] = ((tmp[i] & 0x01) << 7) | ((tmp[i] & 0x02) << 5) | ((tmp[i] & 0x04) << 3) | ((tmp[i] & 0x08) << 1) | ((tmp[i] & 0x10) >> 1) | ((tmp[i] & 0x20) >> 3) | ((tmp[i] & 0x40) >> 5) | ((tmp[i] & 0x80) >> 7); uint8_t l[4], r[4], tmpL[4], e[6]; initialPermutation(tmp); memcpy(l, tmp, 4); memcpy(r, &tmp[4], 4); for(int i = 15; i >= 0; --i) { memcpy(tmpL, r, 4); expand(e, r); for(int j = 0; j < 6; ++j) e[j] ^= subKeys[i][j]; substitute(r,e); permutation(r); for(int j = 0; j < 4; ++j) r[j] ^= l[j]; memcpy(l, tmpL, 4); } memcpy(&tmp[4], l, 4); memcpy(tmp, r, 4); invInitialPermutation(tmp); for(int i = 0; i < 8; ++i) { out[i] = ((tmp[i] & 0x01) << 3) | ((tmp[i] & 0x02) << 1) | ((tmp[i] & 0x04) >> 1) | ((tmp[i] & 0x08) >> 3); out[i] <<= 4; tmp[i] >>= 4; out[i] |= ((tmp[i] & 0x01) << 3) | ((tmp[i] & 0x02) << 1) | ((tmp[i] & 0x04) >> 1) | ((tmp[i] & 0x08) >> 3); } }