sara matheu / Mbed 2 deprecated CurvasElipticas

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

Dependencies:   mbed CyaSSL

main.cpp@1:4875e39abd1e, 2015-02-05 (annotated)

Committer:
saranieves92
Date:
Thu Feb 05 23:04:03 2015 +0000
Revision:
1:4875e39abd1e
Child:
2:94f5ffb2a52d
Prueba de generacion de claves, D-H, firma y validacion pasada correctamente

Who changed what in which revision?

UserRevisionLine numberNew contents of line
saranieves92 1:4875e39abd1e 1 #include <mbed.h>
saranieves92 1:4875e39abd1e 2 #include "ecc.h"
saranieves92 1:4875e39abd1e 3 Serial pc(USBTX, USBRX); // tx, rx
saranieves92 1:4875e39abd1e 4
saranieves92 1:4875e39abd1e 5 void vli_print(uint32_t *p_vli, unsigned int p_size)
saranieves92 1:4875e39abd1e 6 {
saranieves92 1:4875e39abd1e 7 while(p_size)
saranieves92 1:4875e39abd1e 8 {
saranieves92 1:4875e39abd1e 9 printf("%08X ", (unsigned)p_vli[p_size - 1]);
saranieves92 1:4875e39abd1e 10 --p_size;
saranieves92 1:4875e39abd1e 11 }
saranieves92 1:4875e39abd1e 12 }
saranieves92 1:4875e39abd1e 13
saranieves92 1:4875e39abd1e 14 int main() {
saranieves92 1:4875e39abd1e 15
saranieves92 1:4875e39abd1e 16 /*GENERACION DE CLAVES*/
saranieves92 1:4875e39abd1e 17 pc.printf("Hola Mundo1\n");
saranieves92 1:4875e39abd1e 18 uint32_t l_private1[NUM_ECC_DIGITS]; //aleatoria
saranieves92 1:4875e39abd1e 19 EccPoint l_public1;
saranieves92 1:4875e39abd1e 20 ecc_make_key(&l_public1, l_private1, l_private1); //Calcula la publica
saranieves92 1:4875e39abd1e 21 pc.printf("%08X ", (unsigned)l_public1.x); //imprime coordenada x de la clave publica
saranieves92 1:4875e39abd1e 22 pc.printf("Adios Mundo1\n");
saranieves92 1:4875e39abd1e 23 pc.printf("%08X ", (unsigned)l_public1.y); //imprime coordenada y de la clave publica
saranieves92 1:4875e39abd1e 24
saranieves92 1:4875e39abd1e 25 uint32_t l_private2[NUM_ECC_DIGITS]; //aleatoria
saranieves92 1:4875e39abd1e 26 EccPoint l_public2;
saranieves92 1:4875e39abd1e 27 ecc_make_key(&l_public2, l_private2, l_private2); //Calcula la publica
saranieves92 1:4875e39abd1e 28 pc.printf("%08X ", (unsigned)l_public2.x); //imprime coordenada x de la clave publica
saranieves92 1:4875e39abd1e 29 pc.printf("Adios Mundo2\n");
saranieves92 1:4875e39abd1e 30 pc.printf("%08X ", (unsigned)l_public2.y); //imprime coordenada y de la clave publica
saranieves92 1:4875e39abd1e 31
saranieves92 1:4875e39abd1e 32 /*D-H*/
saranieves92 1:4875e39abd1e 33 uint32_t l_shared1[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 34 uint32_t l_shared2[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 35 uint32_t l_random1[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 36 uint32_t l_random2[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 37
saranieves92 1:4875e39abd1e 38 //comprobamos que se ha generado bien la clave compartida y que tienen la misma
saranieves92 1:4875e39abd1e 39 if(!ecdh_shared_secret(l_shared1, &l_public1, l_private2, l_random1))
saranieves92 1:4875e39abd1e 40 {
saranieves92 1:4875e39abd1e 41 pc.printf("shared_secret() failed (1)\n");
saranieves92 1:4875e39abd1e 42 return 1;
saranieves92 1:4875e39abd1e 43 }
saranieves92 1:4875e39abd1e 44
saranieves92 1:4875e39abd1e 45 if(!ecdh_shared_secret(l_shared2, &l_public2, l_private1, l_random2))
saranieves92 1:4875e39abd1e 46 {
saranieves92 1:4875e39abd1e 47 pc.printf("shared_secret() failed (2)\n");
saranieves92 1:4875e39abd1e 48 return 1;
saranieves92 1:4875e39abd1e 49 }
saranieves92 1:4875e39abd1e 50
saranieves92 1:4875e39abd1e 51 if(memcmp(l_shared1, l_shared2, sizeof(l_shared1)) != 0)
saranieves92 1:4875e39abd1e 52 {
saranieves92 1:4875e39abd1e 53 pc.printf("Shared secrets are not identical!\n");
saranieves92 1:4875e39abd1e 54 pc.printf("Shared secret 1 = ");
saranieves92 1:4875e39abd1e 55 vli_print(l_shared1, NUM_ECC_DIGITS);
saranieves92 1:4875e39abd1e 56 pc.printf("\n");
saranieves92 1:4875e39abd1e 57 pc.printf("Shared secret 2 = ");
saranieves92 1:4875e39abd1e 58 vli_print(l_shared2, NUM_ECC_DIGITS);
saranieves92 1:4875e39abd1e 59 pc.printf("\n");
saranieves92 1:4875e39abd1e 60 pc.printf("Private key 1 = ");
saranieves92 1:4875e39abd1e 61 vli_print(l_private1, NUM_ECC_DIGITS);
saranieves92 1:4875e39abd1e 62 pc.printf("\n");
saranieves92 1:4875e39abd1e 63 pc.printf("Private key 2 = ");
saranieves92 1:4875e39abd1e 64 vli_print(l_private2, NUM_ECC_DIGITS);
saranieves92 1:4875e39abd1e 65 pc.printf("\n");
saranieves92 1:4875e39abd1e 66 }else {
saranieves92 1:4875e39abd1e 67 pc.printf("Shared secrets are identical!\n");
saranieves92 1:4875e39abd1e 68 }
saranieves92 1:4875e39abd1e 69
saranieves92 1:4875e39abd1e 70 /*FIRMA y VERIFICACION*/
saranieves92 1:4875e39abd1e 71
saranieves92 1:4875e39abd1e 72 uint32_t l_hash[NUM_ECC_DIGITS]; //Se supone que es el hash del mensaje que queremos firmar
saranieves92 1:4875e39abd1e 73 uint32_t l_random[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 74
saranieves92 1:4875e39abd1e 75 uint32_t r[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 76 uint32_t s[NUM_ECC_DIGITS];
saranieves92 1:4875e39abd1e 77
saranieves92 1:4875e39abd1e 78 if(!ecdsa_sign(r, s, l_private1, l_random, l_hash))
saranieves92 1:4875e39abd1e 79 {
saranieves92 1:4875e39abd1e 80 pc.printf("ecdsa_sign() failed\n");
saranieves92 1:4875e39abd1e 81 }
saranieves92 1:4875e39abd1e 82
saranieves92 1:4875e39abd1e 83 if(!ecc_valid_public_key(&l_public1))
saranieves92 1:4875e39abd1e 84 {
saranieves92 1:4875e39abd1e 85 pc.printf("Not a valid public key!\n");
saranieves92 1:4875e39abd1e 86 }
saranieves92 1:4875e39abd1e 87
saranieves92 1:4875e39abd1e 88 if(!ecdsa_verify(&l_public1, l_hash, r, s))
saranieves92 1:4875e39abd1e 89 {
saranieves92 1:4875e39abd1e 90 pc.printf("ecdsa_verify() failed\n");
saranieves92 1:4875e39abd1e 91 }else{
saranieves92 1:4875e39abd1e 92 pc.printf("ecdsa_verify() correcto \n");
saranieves92 1:4875e39abd1e 93 }
saranieves92 1:4875e39abd1e 94
saranieves92 1:4875e39abd1e 95 }