Operaciones de generacion de claves, D-H, firma y validacion.

Dependencies:   mbed CyaSSL

Committer:
saranieves92
Date:
Fri Feb 20 18:37:50 2015 +0000
Revision:
5:4f619b9a7bb2
Parent:
3:74a69ff114ba
intento de rsa

Who changed what in which revision?

UserRevisionLine numberNew contents of line
saranieves92 3:74a69ff114ba 1 #include <cstring>
saranieves92 3:74a69ff114ba 2 #include <fstream>
saranieves92 3:74a69ff114ba 3 #include "sha256.h"
saranieves92 3:74a69ff114ba 4
saranieves92 3:74a69ff114ba 5 const unsigned int SHA256::sha256_k[64] = //UL = uint32
saranieves92 3:74a69ff114ba 6 {0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
saranieves92 3:74a69ff114ba 7 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
saranieves92 3:74a69ff114ba 8 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
saranieves92 3:74a69ff114ba 9 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
saranieves92 3:74a69ff114ba 10 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
saranieves92 3:74a69ff114ba 11 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
saranieves92 3:74a69ff114ba 12 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
saranieves92 3:74a69ff114ba 13 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
saranieves92 3:74a69ff114ba 14 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
saranieves92 3:74a69ff114ba 15 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
saranieves92 3:74a69ff114ba 16 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
saranieves92 3:74a69ff114ba 17 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
saranieves92 3:74a69ff114ba 18 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
saranieves92 3:74a69ff114ba 19 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
saranieves92 3:74a69ff114ba 20 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
saranieves92 3:74a69ff114ba 21 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
saranieves92 3:74a69ff114ba 22
saranieves92 3:74a69ff114ba 23 void SHA256::transform(const unsigned char *message, unsigned int block_nb)
saranieves92 3:74a69ff114ba 24 {
saranieves92 3:74a69ff114ba 25 uint32 w[64];
saranieves92 3:74a69ff114ba 26 uint32 wv[8];
saranieves92 3:74a69ff114ba 27 uint32 t1, t2;
saranieves92 3:74a69ff114ba 28 const unsigned char *sub_block;
saranieves92 3:74a69ff114ba 29 int i;
saranieves92 3:74a69ff114ba 30 int j;
saranieves92 3:74a69ff114ba 31 for (i = 0; i < (int) block_nb; i++) {
saranieves92 3:74a69ff114ba 32 sub_block = message + (i << 6);
saranieves92 3:74a69ff114ba 33 for (j = 0; j < 16; j++) {
saranieves92 3:74a69ff114ba 34 SHA2_PACK32(&sub_block[j << 2], &w[j]);
saranieves92 3:74a69ff114ba 35 }
saranieves92 3:74a69ff114ba 36 for (j = 16; j < 64; j++) {
saranieves92 3:74a69ff114ba 37 w[j] = SHA256_F4(w[j - 2]) + w[j - 7] + SHA256_F3(w[j - 15]) + w[j - 16];
saranieves92 3:74a69ff114ba 38 }
saranieves92 3:74a69ff114ba 39 for (j = 0; j < 8; j++) {
saranieves92 3:74a69ff114ba 40 wv[j] = m_h[j];
saranieves92 3:74a69ff114ba 41 }
saranieves92 3:74a69ff114ba 42 for (j = 0; j < 64; j++) {
saranieves92 3:74a69ff114ba 43 t1 = wv[7] + SHA256_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])
saranieves92 3:74a69ff114ba 44 + sha256_k[j] + w[j];
saranieves92 3:74a69ff114ba 45 t2 = SHA256_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);
saranieves92 3:74a69ff114ba 46 wv[7] = wv[6];
saranieves92 3:74a69ff114ba 47 wv[6] = wv[5];
saranieves92 3:74a69ff114ba 48 wv[5] = wv[4];
saranieves92 3:74a69ff114ba 49 wv[4] = wv[3] + t1;
saranieves92 3:74a69ff114ba 50 wv[3] = wv[2];
saranieves92 3:74a69ff114ba 51 wv[2] = wv[1];
saranieves92 3:74a69ff114ba 52 wv[1] = wv[0];
saranieves92 3:74a69ff114ba 53 wv[0] = t1 + t2;
saranieves92 3:74a69ff114ba 54 }
saranieves92 3:74a69ff114ba 55 for (j = 0; j < 8; j++) {
saranieves92 3:74a69ff114ba 56 m_h[j] += wv[j];
saranieves92 3:74a69ff114ba 57 }
saranieves92 3:74a69ff114ba 58 }
saranieves92 3:74a69ff114ba 59 }
saranieves92 3:74a69ff114ba 60
saranieves92 3:74a69ff114ba 61 void SHA256::init()
saranieves92 3:74a69ff114ba 62 {
saranieves92 3:74a69ff114ba 63 m_h[0] = 0x6a09e667;
saranieves92 3:74a69ff114ba 64 m_h[1] = 0xbb67ae85;
saranieves92 3:74a69ff114ba 65 m_h[2] = 0x3c6ef372;
saranieves92 3:74a69ff114ba 66 m_h[3] = 0xa54ff53a;
saranieves92 3:74a69ff114ba 67 m_h[4] = 0x510e527f;
saranieves92 3:74a69ff114ba 68 m_h[5] = 0x9b05688c;
saranieves92 3:74a69ff114ba 69 m_h[6] = 0x1f83d9ab;
saranieves92 3:74a69ff114ba 70 m_h[7] = 0x5be0cd19;
saranieves92 3:74a69ff114ba 71 m_len = 0;
saranieves92 3:74a69ff114ba 72 m_tot_len = 0;
saranieves92 3:74a69ff114ba 73 }
saranieves92 3:74a69ff114ba 74
saranieves92 3:74a69ff114ba 75 void SHA256::update(const unsigned char *message, unsigned int len)
saranieves92 3:74a69ff114ba 76 {
saranieves92 3:74a69ff114ba 77 unsigned int block_nb;
saranieves92 3:74a69ff114ba 78 unsigned int new_len, rem_len, tmp_len;
saranieves92 3:74a69ff114ba 79 const unsigned char *shifted_message;
saranieves92 3:74a69ff114ba 80 tmp_len = SHA224_256_BLOCK_SIZE - m_len;
saranieves92 3:74a69ff114ba 81 rem_len = len < tmp_len ? len : tmp_len;
saranieves92 3:74a69ff114ba 82 std::memcpy(&m_block[m_len], message, rem_len);
saranieves92 3:74a69ff114ba 83 if (m_len + len < SHA224_256_BLOCK_SIZE) {
saranieves92 3:74a69ff114ba 84 m_len += len;
saranieves92 3:74a69ff114ba 85 return;
saranieves92 3:74a69ff114ba 86 }
saranieves92 3:74a69ff114ba 87 new_len = len - rem_len;
saranieves92 3:74a69ff114ba 88 block_nb = new_len / SHA224_256_BLOCK_SIZE;
saranieves92 3:74a69ff114ba 89 shifted_message = message + rem_len;
saranieves92 3:74a69ff114ba 90 transform(m_block, 1);
saranieves92 3:74a69ff114ba 91 transform(shifted_message, block_nb);
saranieves92 3:74a69ff114ba 92 rem_len = new_len % SHA224_256_BLOCK_SIZE;
saranieves92 3:74a69ff114ba 93 std::memcpy(m_block, &shifted_message[block_nb << 6], rem_len);
saranieves92 3:74a69ff114ba 94 m_len = rem_len;
saranieves92 3:74a69ff114ba 95 m_tot_len += (block_nb + 1) << 6;
saranieves92 3:74a69ff114ba 96 }
saranieves92 3:74a69ff114ba 97
saranieves92 3:74a69ff114ba 98 void SHA256::final(unsigned char *digest)
saranieves92 3:74a69ff114ba 99 {
saranieves92 3:74a69ff114ba 100 unsigned int block_nb;
saranieves92 3:74a69ff114ba 101 unsigned int pm_len;
saranieves92 3:74a69ff114ba 102 unsigned int len_b;
saranieves92 3:74a69ff114ba 103 int i;
saranieves92 3:74a69ff114ba 104 block_nb = (1 + ((SHA224_256_BLOCK_SIZE - 9)
saranieves92 3:74a69ff114ba 105 < (m_len % SHA224_256_BLOCK_SIZE)));
saranieves92 3:74a69ff114ba 106 len_b = (m_tot_len + m_len) << 3;
saranieves92 3:74a69ff114ba 107 pm_len = block_nb << 6;
saranieves92 3:74a69ff114ba 108 std::memset(m_block + m_len, 0, pm_len - m_len);
saranieves92 3:74a69ff114ba 109 m_block[m_len] = 0x80;
saranieves92 3:74a69ff114ba 110 SHA2_UNPACK32(len_b, m_block + pm_len - 4);
saranieves92 3:74a69ff114ba 111 transform(m_block, block_nb);
saranieves92 3:74a69ff114ba 112 for (i = 0 ; i < 8; i++) {
saranieves92 3:74a69ff114ba 113 SHA2_UNPACK32(m_h[i], &digest[i << 2]);
saranieves92 3:74a69ff114ba 114 }
saranieves92 3:74a69ff114ba 115 }
saranieves92 3:74a69ff114ba 116
saranieves92 3:74a69ff114ba 117 std::string sha256(std::string input)
saranieves92 3:74a69ff114ba 118 {
saranieves92 3:74a69ff114ba 119 unsigned char digest[SHA256::DIGEST_SIZE];
saranieves92 3:74a69ff114ba 120 std::memset(digest,0,SHA256::DIGEST_SIZE);
saranieves92 3:74a69ff114ba 121
saranieves92 3:74a69ff114ba 122 SHA256 ctx = SHA256();
saranieves92 3:74a69ff114ba 123 ctx.init();
saranieves92 3:74a69ff114ba 124 ctx.update( (unsigned char*)input.c_str(), input.length());
saranieves92 3:74a69ff114ba 125 ctx.final(digest);
saranieves92 3:74a69ff114ba 126
saranieves92 3:74a69ff114ba 127 char buf[2*SHA256::DIGEST_SIZE+1];
saranieves92 3:74a69ff114ba 128 buf[2*SHA256::DIGEST_SIZE] = 0;
saranieves92 3:74a69ff114ba 129 for (int i = 0; i < SHA256::DIGEST_SIZE; i++)
saranieves92 3:74a69ff114ba 130 std::sprintf(buf+i*2, "%02x", digest[i]);
saranieves92 3:74a69ff114ba 131 return std::string(buf);
saranieves92 3:74a69ff114ba 132 }