srptest.c 3.21 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
#include <openssl/opensslconf.h>
#ifdef OPENSSL_NO_SRP

#include <stdio.h>

int main(int argc, char *argv[])
	{
	printf("No SRP support\n");
	return(0);
	}

#else

#include <openssl/srp.h>
#include <openssl/rand.h>
#include <openssl/err.h>

static void showbn(const char *name, const BIGNUM *bn)
	{
	fputs(name, stdout);
	fputs(" = ", stdout);
	BN_print_fp(stdout, bn);
	putc('\n', stdout);
	}

#define RANDOM_SIZE 32	/* use 256 bits on each side */

static int run_srp(const char *username, const char *client_pass, const char *server_pass)
	{
	int ret=-1;
	BIGNUM *s = NULL;
	BIGNUM *v = NULL;
	BIGNUM *a = NULL;
	BIGNUM *b = NULL;
	BIGNUM *u = NULL;
	BIGNUM *x = NULL;
	BIGNUM *Apub = NULL;
	BIGNUM *Bpub = NULL;
	BIGNUM *Kclient = NULL;
	BIGNUM *Kserver = NULL;
	unsigned char rand_tmp[RANDOM_SIZE];
	/* use builtin 1024-bit params */
	SRP_gN *GN = SRP_get_default_gN("1024");

	if(GN == NULL)
		{
		fprintf(stderr, "Failed to get SRP parameters\n");
		return -1;
		}
	/* Set up server's password entry */
	if(!SRP_create_verifier_BN(username, server_pass, &s, &v, GN->N, GN->g))
		{
		fprintf(stderr, "Failed to create SRP verifier\n");
		return -1;
		}

	showbn("N", GN->N);
	showbn("g", GN->g);
	showbn("Salt", s);
	showbn("Verifier", v);

	/* Server random */
	RAND_pseudo_bytes(rand_tmp, sizeof(rand_tmp));
	b = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
	/* TODO - check b != 0 */
	showbn("b", b);

	/* Server's first message */
	Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
	showbn("B", Bpub);

	if(!SRP_Verify_B_mod_N(Bpub, GN->N))
		{
		fprintf(stderr, "Invalid B\n");
		return -1;
		}

	/* Client random */
	RAND_pseudo_bytes(rand_tmp, sizeof(rand_tmp));
	a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
	/* TODO - check a != 0 */
	showbn("a", a);

	/* Client's response */
	Apub = SRP_Calc_A(a, GN->N, GN->g);
	showbn("A", Apub);

	if(!SRP_Verify_A_mod_N(Apub, GN->N))
		{
		fprintf(stderr, "Invalid A\n");
		return -1;
		}

	/* Both sides calculate u */
	u = SRP_Calc_u(Apub, Bpub, GN->N);

	/* Client's key */
	x = SRP_Calc_x(s, username, client_pass);
	Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
	showbn("Client's key", Kclient);

	/* Server's key */
	Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
	showbn("Server's key", Kserver);

	if(BN_cmp(Kclient, Kserver) == 0)
		{
		ret = 0;
		}
	else
		{
		fprintf(stderr, "Keys mismatch\n");
		ret = 1;
		}

	BN_clear_free(Kclient);
	BN_clear_free(Kserver);
	BN_clear_free(x);
	BN_free(u);
	BN_free(Apub);
	BN_clear_free(a);
	BN_free(Bpub);
	BN_clear_free(b);
	BN_free(s);
	BN_clear_free(v);

	return ret;
	}

int main(int argc, char **argv)
	{
	BIO *bio_err;
	bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);

	CRYPTO_malloc_debug_init();
	CRYPTO_dbg_set_options(V_CRYPTO_MDEBUG_ALL);
	CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);

	ERR_load_crypto_strings();

	/* "Negative" test, expect a mismatch */
	if(run_srp("alice", "password1", "password2") == 0)
		{
		fprintf(stderr, "Mismatched SRP run failed\n");
		return 1;
		}

	/* "Positive" test, should pass */
	if(run_srp("alice", "password", "password") != 0)
		{
		fprintf(stderr, "Plain SRP run failed\n");
		return 1;
		}

	CRYPTO_cleanup_all_ex_data();
	ERR_remove_thread_state(NULL);
	ERR_free_strings();
	CRYPTO_mem_leaks(bio_err);

	return 0;
	}
#endif