Add SRP test vectors from RFC5054

Reviewed-by: NRich Salz <rsalz@openssl.org>

test/srptest.c

@@ -130,6 +130,150 @@ static int run_srp(const char *username, const char *client_pass,
     return ret;
 }
 
+static int check_bn(const char *name, const BIGNUM *bn, const char *hexbn)
+{
+    BIGNUM *tmp = NULL;
+    int rv;
+    if (BN_hex2bn(&tmp, hexbn) == 0)
+        return 0;
+    rv = BN_cmp(bn, tmp);
+    if (rv == 0) {
+        printf("%s = ", name);
+        BN_print_fp(stdout, bn);
+        printf("\n");
+        BN_free(tmp);
+        return 1;
+    }
+    printf("Unexpected %s value\n", name);
+    printf("Expecting: ");
+    BN_print_fp(stdout, tmp);
+    printf("\nReceived: ");
+    BN_print_fp(stdout, bn);
+    printf("\n");
+    BN_free(tmp);
+    return 0;
+}
+
+/* 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;
+}
+
 int main(int argc, char **argv)
 {
     BIO *bio_err;
@@ -151,6 +295,12 @@ int main(int argc, char **argv)
         return 1;
     }
 
+    /* KAT from RFC5054: should pass */
+    if (run_srp_kat() != 1) {
+        fprintf(stderr, "SRP KAT failed\n");
+        return 1;
+    }
+
 #ifndef OPENSSL_NO_CRYPTO_MDEBUG
     if (CRYPTO_mem_leaks(bio_err) <= 0)
         return 1;