157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
#include <openssl/opensslconf.h>
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#ifdef OPENSSL_NO_SRP
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# include <stdio.h>
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int main(int argc, char *argv[])
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{
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printf("No SRP support\n");
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return (0);
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}
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#else
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# include <openssl/srp.h>
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# include <openssl/rand.h>
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# include <openssl/err.h>
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static void showbn(const char *name, const BIGNUM *bn)
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{
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fputs(name, stdout);
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fputs(" = ", stdout);
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BN_print_fp(stdout, bn);
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putc('\n', stdout);
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}
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# define RANDOM_SIZE 32 /* use 256 bits on each side */
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static int run_srp(const char *username, const char *client_pass,
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const char *server_pass)
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{
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int ret = -1;
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BIGNUM *s = NULL;
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BIGNUM *v = NULL;
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BIGNUM *a = NULL;
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BIGNUM *b = NULL;
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BIGNUM *u = NULL;
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BIGNUM *x = NULL;
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BIGNUM *Apub = NULL;
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BIGNUM *Bpub = NULL;
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BIGNUM *Kclient = NULL;
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BIGNUM *Kserver = NULL;
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unsigned char rand_tmp[RANDOM_SIZE];
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/* use builtin 1024-bit params */
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const SRP_gN *GN = SRP_get_default_gN("1024");
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if (GN == NULL) {
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fprintf(stderr, "Failed to get SRP parameters\n");
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return -1;
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}
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/* Set up server's password entry */
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if (!SRP_create_verifier_BN(username, server_pass, &s, &v, GN->N, GN->g)) {
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fprintf(stderr, "Failed to create SRP verifier\n");
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return -1;
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}
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showbn("N", GN->N);
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showbn("g", GN->g);
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showbn("Salt", s);
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showbn("Verifier", v);
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/* Server random */
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RAND_bytes(rand_tmp, sizeof(rand_tmp));
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b = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
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/* TODO - check b != 0 */
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showbn("b", b);
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/* Server's first message */
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Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
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showbn("B", Bpub);
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if (!SRP_Verify_B_mod_N(Bpub, GN->N)) {
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fprintf(stderr, "Invalid B\n");
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return -1;
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}
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/* Client random */
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RAND_bytes(rand_tmp, sizeof(rand_tmp));
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a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
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/* TODO - check a != 0 */
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showbn("a", a);
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/* Client's response */
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Apub = SRP_Calc_A(a, GN->N, GN->g);
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showbn("A", Apub);
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if (!SRP_Verify_A_mod_N(Apub, GN->N)) {
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fprintf(stderr, "Invalid A\n");
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return -1;
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}
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/* Both sides calculate u */
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u = SRP_Calc_u(Apub, Bpub, GN->N);
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/* Client's key */
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x = SRP_Calc_x(s, username, client_pass);
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Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
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showbn("Client's key", Kclient);
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/* Server's key */
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Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
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showbn("Server's key", Kserver);
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if (BN_cmp(Kclient, Kserver) == 0) {
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ret = 0;
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} else {
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fprintf(stderr, "Keys mismatch\n");
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ret = 1;
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}
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BN_clear_free(Kclient);
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BN_clear_free(Kserver);
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BN_clear_free(x);
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BN_free(u);
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BN_free(Apub);
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BN_clear_free(a);
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BN_free(Bpub);
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BN_clear_free(b);
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BN_free(s);
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BN_clear_free(v);
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return ret;
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}
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int main(int argc, char **argv)
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{
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BIO *bio_err;
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bio_err = BIO_new_fp(stderr, BIO_NOCLOSE | BIO_FP_TEXT);
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CRYPTO_set_mem_debug(1);
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CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
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ERR_load_crypto_strings();
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/* "Negative" test, expect a mismatch */
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if (run_srp("alice", "password1", "password2") == 0) {
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fprintf(stderr, "Mismatched SRP run failed\n");
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return 1;
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}
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/* "Positive" test, should pass */
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if (run_srp("alice", "password", "password") != 0) {
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fprintf(stderr, "Plain SRP run failed\n");
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return 1;
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}
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CRYPTO_cleanup_all_ex_data();
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ERR_remove_thread_state(NULL);
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ERR_free_strings();
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#ifndef OPENSSL_NO_CRYPTO_MDEBUG
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if (CRYPTO_mem_leaks(bio_err) <= 0)
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return 1;
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#endif
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BIO_free(bio_err);
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return 0;
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}
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#endif
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