/* server side */
int SSL_srp_server_param_with_username(SSL *s, int *ad)
{
unsigned char b[SSL_MAX_MASTER_KEY_LENGTH];
int al;
*ad = SSL_AD_UNKNOWN_PSK_IDENTITY;
if ((s->srp_ctx.TLS_ext_srp_username_callback !=NULL) &&
((al = s->srp_ctx.TLS_ext_srp_username_callback(s, ad, s->srp_ctx.SRP_cb_arg))!=SSL_ERROR_NONE))
return al;
*ad = SSL_AD_INTERNAL_ERROR;
if ((s->srp_ctx.N == NULL) ||
(s->srp_ctx.g == NULL) ||
(s->srp_ctx.s == NULL) ||
(s->srp_ctx.v == NULL))
return SSL3_AL_FATAL;
if (RAND_bytes(b, sizeof(b)) <= 0)
return SSL3_AL_FATAL;
s->srp_ctx.b = BN_bin2bn(b,sizeof(b),NULL);
OPENSSL_cleanse(b,sizeof(b));
/* Calculate: B = (kv + g^b) % N */
return ((s->srp_ctx.B = SRP_Calc_B(s->srp_ctx.b, s->srp_ctx.N, s->srp_ctx.g, s->srp_ctx.v)) != NULL)?
SSL_ERROR_NONE:SSL3_AL_FATAL;
}
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 */
const 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;
}
/* SRP test vectors from RFC5054 */
static int run_srp_kat(void)
{
int ret = 0;
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;
/* use builtin 1024-bit params */
const SRP_gN *GN = SRP_get_default_gN("1024");
if (GN == NULL) {
fprintf(stderr, "Failed to get SRP parameters\n");
goto err;
}
BN_hex2bn(&s, "BEB25379D1A8581EB5A727673A2441EE");
/* Set up server's password entry */
if (!SRP_create_verifier_BN("alice", "password123", &s, &v, GN->N,
GN->g)) {
fprintf(stderr, "Failed to create SRP verifier\n");
goto err;
}
if (!check_bn("v", v,
"7E273DE8696FFC4F4E337D05B4B375BEB0DDE1569E8FA00A9886D812"
"9BADA1F1822223CA1A605B530E379BA4729FDC59F105B4787E5186F5"
"C671085A1447B52A48CF1970B4FB6F8400BBF4CEBFBB168152E08AB5"
"EA53D15C1AFF87B2B9DA6E04E058AD51CC72BFC9033B564E26480D78"
"E955A5E29E7AB245DB2BE315E2099AFB"))
goto err;
/* Server random */
BN_hex2bn(&b, "E487CB59D31AC550471E81F00F6928E01DDA08E974A004F49E61F5D1"
"05284D20");
/* Server's first message */
Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
if (!SRP_Verify_B_mod_N(Bpub, GN->N)) {
fprintf(stderr, "Invalid B\n");
goto err;
}
if (!check_bn("B", Bpub,
"BD0C61512C692C0CB6D041FA01BB152D4916A1E77AF46AE105393011"
"BAF38964DC46A0670DD125B95A981652236F99D9B681CBF87837EC99"
"6C6DA04453728610D0C6DDB58B318885D7D82C7F8DEB75CE7BD4FBAA"
"37089E6F9C6059F388838E7A00030B331EB76840910440B1B27AAEAE"
"EB4012B7D7665238A8E3FB004B117B58"))
goto err;
/* Client random */
BN_hex2bn(&a, "60975527035CF2AD1989806F0407210BC81EDC04E2762A56AFD529DD"
"DA2D4393");
/* Client's response */
Apub = SRP_Calc_A(a, GN->N, GN->g);
if (!SRP_Verify_A_mod_N(Apub, GN->N)) {
fprintf(stderr, "Invalid A\n");
return -1;
}
if (!check_bn("A", Apub,
"61D5E490F6F1B79547B0704C436F523DD0E560F0C64115BB72557EC4"
"4352E8903211C04692272D8B2D1A5358A2CF1B6E0BFCF99F921530EC"
"8E39356179EAE45E42BA92AEACED825171E1E8B9AF6D9C03E1327F44"
"BE087EF06530E69F66615261EEF54073CA11CF5858F0EDFDFE15EFEA"
"B349EF5D76988A3672FAC47B0769447B"))
goto err;
/* Both sides calculate u */
u = SRP_Calc_u(Apub, Bpub, GN->N);
if (!check_bn("u", u, "CE38B9593487DA98554ED47D70A7AE5F462EF019"))
goto err;
/* Client's key */
x = SRP_Calc_x(s, "alice", "password123");
Kclient = SRP_Calc_client_key(GN->N, Bpub, GN->g, x, a, u);
if (!check_bn("Client's key", Kclient,
"B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
"233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
"41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
"3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
"C346D7E474B29EDE8A469FFECA686E5A"))
goto err;
/* Server's key */
Kserver = SRP_Calc_server_key(Apub, v, u, b, GN->N);
if (!check_bn("Server's key", Kserver,
"B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
"233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
"41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
"3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
"C346D7E474B29EDE8A469FFECA686E5A"))
goto err;
ret = 1;
err:
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;
}
static int run_srp(const char *username, const char *client_pass,
const char *server_pass)
{
int ret = 0;
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 */
const SRP_gN *GN;
if (!TEST_ptr(GN = SRP_get_default_gN("1024")))
return 0;
/* Set up server's password entry */
if (!TEST_true(SRP_create_verifier_BN(username, server_pass,
&s, &v, GN->N, GN->g)))
goto end;
showbn("N", GN->N);
showbn("g", GN->g);
showbn("Salt", s);
showbn("Verifier", v);
/* Server random */
RAND_bytes(rand_tmp, sizeof(rand_tmp));
b = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
if (!TEST_BN_ne_zero(b))
goto end;
showbn("b", b);
/* Server's first message */
Bpub = SRP_Calc_B(b, GN->N, GN->g, v);
showbn("B", Bpub);
if (!TEST_true(SRP_Verify_B_mod_N(Bpub, GN->N)))
goto end;
/* Client random */
RAND_bytes(rand_tmp, sizeof(rand_tmp));
a = BN_bin2bn(rand_tmp, sizeof(rand_tmp), NULL);
if (!TEST_BN_ne_zero(a))
goto end;
showbn("a", a);
/* Client's response */
Apub = SRP_Calc_A(a, GN->N, GN->g);
showbn("A", Apub);
if (!TEST_true(SRP_Verify_A_mod_N(Apub, GN->N)))
goto end;
/* 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 (!TEST_BN_eq(Kclient, Kserver))
goto end;
ret = 1;
end:
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;
}