/**
* Create a {@link SimulatedTlsSRPIdentityManager} that implements the algorithm from RFC 5054 2.5.1.3
*
* @param group the {@link SRP6GroupParameters} defining the group that SRP is operating in
* @param seedKey the secret "seed key" referred to in RFC 5054 2.5.1.3
* @return an instance of {@link SimulatedTlsSRPIdentityManager}
*/
public static SimulatedTlsSrpIdentityManager GetRfc5054Default(Srp6GroupParameters group, byte[] seedKey)
{
Srp6VerifierGenerator verifierGenerator = new Srp6VerifierGenerator();
verifierGenerator.Init(group, TlsUtilities.CreateHash(HashAlgorithm.sha1));
HMac mac = new HMac(TlsUtilities.CreateHash(HashAlgorithm.sha1));
mac.Init(new KeyParameter(seedKey));
return new SimulatedTlsSrpIdentityManager(group, verifierGenerator, mac);
}
private void rfc5054AppendixBTestVectors()
{
byte[] I = Encoding.UTF8.GetBytes("alice");
byte[] P = Encoding.UTF8.GetBytes("password123");
byte[] s = Hex.Decode("BEB25379D1A8581EB5A727673A2441EE");
BigInteger N = N_1024;
BigInteger g = g_1024;
BigInteger a = FromHex("60975527035CF2AD1989806F0407210BC81EDC04E2762A56AFD529DDDA2D4393");
BigInteger b = FromHex("E487CB59D31AC550471E81F00F6928E01DDA08E974A004F49E61F5D105284D20");
BigInteger expect_k = FromHex("7556AA045AEF2CDD07ABAF0F665C3E818913186F");
BigInteger expect_x = FromHex("94B7555AABE9127CC58CCF4993DB6CF84D16C124");
BigInteger expect_v = FromHex("7E273DE8696FFC4F4E337D05B4B375BEB0DDE1569E8FA00A9886D812"
+ "9BADA1F1822223CA1A605B530E379BA4729FDC59F105B4787E5186F5"
+ "C671085A1447B52A48CF1970B4FB6F8400BBF4CEBFBB168152E08AB5"
+ "EA53D15C1AFF87B2B9DA6E04E058AD51CC72BFC9033B564E26480D78"
+ "E955A5E29E7AB245DB2BE315E2099AFB");
BigInteger expect_A = FromHex("61D5E490F6F1B79547B0704C436F523DD0E560F0C64115BB72557EC4"
+ "4352E8903211C04692272D8B2D1A5358A2CF1B6E0BFCF99F921530EC"
+ "8E39356179EAE45E42BA92AEACED825171E1E8B9AF6D9C03E1327F44"
+ "BE087EF06530E69F66615261EEF54073CA11CF5858F0EDFDFE15EFEA"
+ "B349EF5D76988A3672FAC47B0769447B");
BigInteger expect_B = FromHex("BD0C61512C692C0CB6D041FA01BB152D4916A1E77AF46AE105393011"
+ "BAF38964DC46A0670DD125B95A981652236F99D9B681CBF87837EC99"
+ "6C6DA04453728610D0C6DDB58B318885D7D82C7F8DEB75CE7BD4FBAA"
+ "37089E6F9C6059F388838E7A00030B331EB76840910440B1B27AAEAE"
+ "EB4012B7D7665238A8E3FB004B117B58");
BigInteger expect_u = FromHex("CE38B9593487DA98554ED47D70A7AE5F462EF019");
BigInteger expect_S = FromHex("B0DC82BABCF30674AE450C0287745E7990A3381F63B387AAF271A10D"
+ "233861E359B48220F7C4693C9AE12B0A6F67809F0876E2D013800D6C"
+ "41BB59B6D5979B5C00A172B4A2A5903A0BDCAF8A709585EB2AFAFA8F"
+ "3499B200210DCC1F10EB33943CD67FC88A2F39A4BE5BEC4EC0A3212D"
+ "C346D7E474B29EDE8A469FFECA686E5A");
BigInteger k = Srp6Utilities.CalculateK(new Sha1Digest(), N, g);
if (!k.Equals(expect_k))
{
Fail("wrong value of 'k'");
}
BigInteger x = Srp6Utilities.CalculateX(new Sha1Digest(), N, s, I, P);
if (!x.Equals(expect_x))
{
Fail("wrong value of 'x'");
}
Srp6VerifierGenerator gen = new Srp6VerifierGenerator();
gen.Init(N, g, new Sha1Digest());
BigInteger v = gen.GenerateVerifier(s, I, P);
if (!v.Equals(expect_v))
{
Fail("wrong value of 'v'");
}
Srp6Client client = new MySrp6Client(a);
client.Init(N, g, new Sha1Digest(), random);
BigInteger A = client.GenerateClientCredentials(s, I, P);
if (!A.Equals(expect_A))
{
Fail("wrong value of 'A'");
}
Srp6Server server = new MySrp6Server(b);
server.Init(N, g, v, new Sha1Digest(), random);
BigInteger B = server.GenerateServerCredentials();
if (!B.Equals(expect_B))
{
Fail("wrong value of 'B'");
}
BigInteger u = Srp6Utilities.CalculateU(new Sha1Digest(), N, A, B);
if (!u.Equals(expect_u))
{
Fail("wrong value of 'u'");
}
BigInteger clientS = client.CalculateSecret(B);
if (!clientS.Equals(expect_S))
{
Fail("wrong value of 'S' (client)");
}
BigInteger serverS = server.CalculateSecret(A);
if (!serverS.Equals(expect_S))
{
Fail("wrong value of 'S' (server)");
}
}
private void testServerCatchesBadA(BigInteger N, BigInteger g)
{
byte[] I = Encoding.UTF8.GetBytes("username");
byte[] P = Encoding.UTF8.GetBytes("password");
byte[] s = new byte[16];
random.NextBytes(s);
Srp6VerifierGenerator gen = new Srp6VerifierGenerator();
gen.Init(N, g, new Sha256Digest());
BigInteger v = gen.GenerateVerifier(s, I, P);
Srp6Server server = new Srp6Server();
server.Init(N, g, v, new Sha256Digest(), random);
server.GenerateServerCredentials();
try
{
server.CalculateSecret(BigInteger.Zero);
Fail("Client failed to detect invalid value for 'A'");
}
catch (CryptoException)
{
// Expected
}
try
{
server.CalculateSecret(N);
Fail("Client failed to detect invalid value for 'A'");
}
catch (CryptoException)
{
// Expected
}
}
private void testMutualVerification(BigInteger N, BigInteger g)
{
byte[] I = Encoding.UTF8.GetBytes("username");
byte[] P = Encoding.UTF8.GetBytes("password");
byte[] s = new byte[16];
random.NextBytes(s);
Srp6VerifierGenerator gen = new Srp6VerifierGenerator();
gen.Init(N, g, new Sha256Digest());
BigInteger v = gen.GenerateVerifier(s, I, P);
Srp6Client client = new Srp6Client();
client.Init(N, g, new Sha256Digest(), random);
Srp6Server server = new Srp6Server();
server.Init(N, g, v, new Sha256Digest(), random);
BigInteger A = client.GenerateClientCredentials(s, I, P);
BigInteger B = server.GenerateServerCredentials();
BigInteger clientS = client.CalculateSecret(B);
BigInteger serverS = server.CalculateSecret(A);
if (!clientS.Equals(serverS))
{
Fail("SRP agreement failed - client/server calculated different secrets");
}
}
public virtual TlsSrpLoginParameters GetLoginParameters(byte[] identity)
{
if (Arrays.AreEqual(TEST_IDENTITY, identity))
{
Srp6VerifierGenerator verifierGenerator = new Srp6VerifierGenerator();
verifierGenerator.Init(TEST_GROUP, TlsUtilities.CreateHash(HashAlgorithm.sha1));
BigInteger verifier = verifierGenerator.GenerateVerifier(TEST_SALT, identity, TEST_PASSWORD);
return new TlsSrpLoginParameters(TEST_GROUP, verifier, TEST_SALT);
}
return unknownIdentityManager.GetLoginParameters(identity);
}
public SimulatedTlsSrpIdentityManager(Srp6GroupParameters group, Srp6VerifierGenerator verifierGenerator, IMac mac)
{
this.mGroup = group;
this.mVerifierGenerator = verifierGenerator;
this.mMac = mac;
}