sara matheu / Mbed 2 deprecated CurvasElipticas

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

Dependencies:   mbed CyaSSL

main.cpp@3:74a69ff114ba, 2015-02-14 (annotated)

Committer:
saranieves92
Date:
Sat Feb 14 18:10:15 2015 +0000
Revision:
3:74a69ff114ba
Parent:
2:94f5ffb2a52d
Child:
5:4f619b9a7bb2
Disponible funcion SHA256 y conversion a uint32 para que pueda usarlo la funcion de firma

Who changed what in which revision?

UserRevisionLine numberNew contents of line
saranieves92 1:4875e39abd1e 1 #include <mbed.h>
saranieves92 3:74a69ff114ba 2 #include <time.h>
saranieves92 3:74a69ff114ba 3 #include <string>
saranieves92 3:74a69ff114ba 4 #include <stdlib.h>
saranieves92 3:74a69ff114ba 5 #include <cstdio>
saranieves92 3:74a69ff114ba 6 #include <cstdlib>
saranieves92 3:74a69ff114ba 7 #include <alloca.h>
saranieves92 3:74a69ff114ba 8 #include "sha256.h"
saranieves92 1:4875e39abd1e 9 #include "ecc.h"
saranieves92 1:4875e39abd1e 10 Serial pc(USBTX, USBRX); // tx, rx
saranieves92 1:4875e39abd1e 11
saranieves92 1:4875e39abd1e 12 void vli_print(uint32_t *p_vli, unsigned int p_size)
saranieves92 1:4875e39abd1e 13 {
saranieves92 1:4875e39abd1e 14 while(p_size)
saranieves92 1:4875e39abd1e 15 {
saranieves92 1:4875e39abd1e 16 printf("%08X ", (unsigned)p_vli[p_size - 1]);
saranieves92 1:4875e39abd1e 17 --p_size;
saranieves92 1:4875e39abd1e 18 }
saranieves92 1:4875e39abd1e 19 }
saranieves92 1:4875e39abd1e 20
saranieves92 1:4875e39abd1e 21 int main() {
saranieves92 3:74a69ff114ba 22 clock_t t_ini, t_fin;
saranieves92 3:74a69ff114ba 23 double secs;
saranieves92 3:74a69ff114ba 24
saranieves92 3:74a69ff114ba 25
saranieves92 1:4875e39abd1e 26 /*GENERACION DE CLAVES*/
saranieves92 2:94f5ffb2a52d 27 pc.printf("Hola soy Alice, voy a generar mi clave publica coordenada x \n");
saranieves92 3:74a69ff114ba 28 uint32_t l_private1[NUM_ECC_DIGITS];//clave privada
saranieves92 3:74a69ff114ba 29 uint32_t aleat[NUM_ECC_DIGITS]; //aleatorio
saranieves92 3:74a69ff114ba 30 for (int i=0; i<NUM_ECC_DIGITS;i++){
saranieves92 3:74a69ff114ba 31 aleat[i]=rand()%10; //entero entre 0-9
saranieves92 3:74a69ff114ba 32 }
saranieves92 3:74a69ff114ba 33
saranieves92 1:4875e39abd1e 34 EccPoint l_public1;
saranieves92 3:74a69ff114ba 35 t_ini = clock();
saranieves92 3:74a69ff114ba 36 ecc_make_key(&l_public1, l_private1, aleat); //Calcula la publica
saranieves92 3:74a69ff114ba 37 t_fin = clock();
saranieves92 1:4875e39abd1e 38 pc.printf("%08X ", (unsigned)l_public1.x); //imprime coordenada x de la clave publica
saranieves92 2:94f5ffb2a52d 39 pc.printf("Hola soy Alice, voy a generar mi clave publica coordenada y \n");
saranieves92 1:4875e39abd1e 40 pc.printf("%08X ", (unsigned)l_public1.y); //imprime coordenada y de la clave publica
saranieves92 1:4875e39abd1e 41
saranieves92 1:4875e39abd1e 42 uint32_t l_private2[NUM_ECC_DIGITS]; //aleatoria
saranieves92 1:4875e39abd1e 43 EccPoint l_public2;
saranieves92 3:74a69ff114ba 44 ecc_make_key(&l_public2, l_private2, aleat); //Calcula la publica
saranieves92 2:94f5ffb2a52d 45 pc.printf("Hola soy Bob, voy a generar mi clave publica coordenada x \n");
saranieves92 1:4875e39abd1e 46 pc.printf("%08X ", (unsigned)l_public2.x); //imprime coordenada x de la clave publica
saranieves92 2:94f5ffb2a52d 47 pc.printf("Hola soy Bob, voy a generar mi clave publica coordenada y \n");
saranieves92 1:4875e39abd1e 48 pc.printf("%08X ", (unsigned)l_public2.y); //imprime coordenada y de la clave publica
saranieves92 1:4875e39abd1e 49
saranieves92 1:4875e39abd1e 50 /*D-H*/
saranieves92 1:4875e39abd1e 51 uint32_t l_shared1[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 52 uint32_t l_shared2[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 53 uint32_t l_random1[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 54 uint32_t l_random2[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 55
saranieves92 1:4875e39abd1e 56 //comprobamos que se ha generado bien la clave compartida y que tienen la misma
saranieves92 1:4875e39abd1e 57 if(!ecdh_shared_secret(l_shared1, &l_public1, l_private2, l_random1))
saranieves92 1:4875e39abd1e 58 {
saranieves92 1:4875e39abd1e 59 pc.printf("shared_secret() failed (1)\n");
saranieves92 1:4875e39abd1e 60 return 1;
saranieves92 1:4875e39abd1e 61 }
saranieves92 1:4875e39abd1e 62
saranieves92 1:4875e39abd1e 63 if(!ecdh_shared_secret(l_shared2, &l_public2, l_private1, l_random2))
saranieves92 1:4875e39abd1e 64 {
saranieves92 1:4875e39abd1e 65 pc.printf("shared_secret() failed (2)\n");
saranieves92 1:4875e39abd1e 66 return 1;
saranieves92 1:4875e39abd1e 67 }
saranieves92 1:4875e39abd1e 68
saranieves92 1:4875e39abd1e 69 if(memcmp(l_shared1, l_shared2, sizeof(l_shared1)) != 0)
saranieves92 1:4875e39abd1e 70 {
saranieves92 1:4875e39abd1e 71 pc.printf("Shared secrets are not identical!\n");
saranieves92 1:4875e39abd1e 72 pc.printf("Shared secret 1 = ");
saranieves92 1:4875e39abd1e 73 vli_print(l_shared1, NUM_ECC_DIGITS);
saranieves92 1:4875e39abd1e 74 pc.printf("\n");
saranieves92 1:4875e39abd1e 75 pc.printf("Shared secret 2 = ");
saranieves92 1:4875e39abd1e 76 vli_print(l_shared2, NUM_ECC_DIGITS);
saranieves92 1:4875e39abd1e 77 pc.printf("\n");
saranieves92 1:4875e39abd1e 78 pc.printf("Private key 1 = ");
saranieves92 1:4875e39abd1e 79 vli_print(l_private1, NUM_ECC_DIGITS);
saranieves92 1:4875e39abd1e 80 pc.printf("\n");
saranieves92 1:4875e39abd1e 81 pc.printf("Private key 2 = ");
saranieves92 1:4875e39abd1e 82 vli_print(l_private2, NUM_ECC_DIGITS);
saranieves92 1:4875e39abd1e 83 pc.printf("\n");
saranieves92 1:4875e39abd1e 84 }else {
saranieves92 1:4875e39abd1e 85 pc.printf("Shared secrets are identical!\n");
saranieves92 1:4875e39abd1e 86 }
saranieves92 1:4875e39abd1e 87
saranieves92 1:4875e39abd1e 88 /*FIRMA y VERIFICACION*/
saranieves92 1:4875e39abd1e 89
saranieves92 3:74a69ff114ba 90 string mensaje = "Hola";
saranieves92 3:74a69ff114ba 91
saranieves92 3:74a69ff114ba 92 //SHA-256 y paso a uint32//
saranieves92 3:74a69ff114ba 93 string output1 = sha256(mensaje);
saranieves92 3:74a69ff114ba 94 uint32_t hash[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 95
saranieves92 3:74a69ff114ba 96 int j=0;
saranieves92 3:74a69ff114ba 97 while (j<NUM_ECC_DIGITS){
saranieves92 3:74a69ff114ba 98 string cortada=output1.substr(8*j, 7);
saranieves92 3:74a69ff114ba 99 //pc.printf("corte: %s ", cortada);
saranieves92 3:74a69ff114ba 100 const char* caracteres=cortada.c_str();
saranieves92 3:74a69ff114ba 101 uint32_t x = strtoul(caracteres, NULL, 16);
saranieves92 3:74a69ff114ba 102 //pc.printf("hash: %08X ", (unsigned)x);
saranieves92 3:74a69ff114ba 103 hash[j]=x;
saranieves92 3:74a69ff114ba 104 j++;
saranieves92 3:74a69ff114ba 105 }
saranieves92 3:74a69ff114ba 106 ///--------///
saranieves92 3:74a69ff114ba 107 uint32_t aleatorio[NUM_ECC_DIGITS];
saranieves92 3:74a69ff114ba 108 for (int i=0; i<NUM_ECC_DIGITS;i++){
saranieves92 3:74a69ff114ba 109 aleatorio[i]=rand()%10; //entero entre 0-9
saranieves92 3:74a69ff114ba 110 }
saranieves92 1:4875e39abd1e 111 uint32_t r[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 112 uint32_t s[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 113
saranieves92 3:74a69ff114ba 114 if(!ecdsa_sign(r, s, l_private1, aleatorio, hash))
saranieves92 1:4875e39abd1e 115 {
saranieves92 1:4875e39abd1e 116 pc.printf("ecdsa_sign() failed\n");
saranieves92 1:4875e39abd1e 117 }
saranieves92 1:4875e39abd1e 118
saranieves92 1:4875e39abd1e 119 if(!ecc_valid_public_key(&l_public1))
saranieves92 1:4875e39abd1e 120 {
saranieves92 1:4875e39abd1e 121 pc.printf("Not a valid public key!\n");
saranieves92 1:4875e39abd1e 122 }
saranieves92 1:4875e39abd1e 123
saranieves92 3:74a69ff114ba 124 if(!ecdsa_verify(&l_public1, hash, r, s))
saranieves92 1:4875e39abd1e 125 {
saranieves92 1:4875e39abd1e 126 pc.printf("ecdsa_verify() failed\n");
saranieves92 1:4875e39abd1e 127 }else{
saranieves92 1:4875e39abd1e 128 pc.printf("ecdsa_verify() correcto \n");
saranieves92 1:4875e39abd1e 129 }
saranieves92 3:74a69ff114ba 130
saranieves92 3:74a69ff114ba 131
saranieves92 3:74a69ff114ba 132 secs = (double)(t_fin - t_ini) / CLOCKS_PER_SEC;
saranieves92 3:74a69ff114ba 133 pc.printf("%.16g milisegundos\n", secs * 1000.0);
saranieves92 3:74a69ff114ba 134
saranieves92 1:4875e39abd1e 135
saranieves92 1:4875e39abd1e 136 }