public void VerifyHMAC(MessageDigest digest, string[] results)
{
byte[] hash = HMAC.Digest(digest, key, small_data);
string str = BitConverter.ToString(hash);
if (str != results[0])
{
Console.WriteLine("{0} - Failed to calculate hash on {1}", digest.Name, small_data);
Console.WriteLine("got {0} instead of {1}", str, results[0]);
}
else
{
Console.WriteLine("{0} - Test 1 passed.", digest.Name);
}
// Compute the large hash
using (HMAC hmac = new HMAC())
{
byte[] buf = Encoding.ASCII.GetBytes(new string('a', 1000));
hmac.Init(key, digest);
for (int i = 0; i < 1000; i++)
{
hmac.Update(buf);
}
hash = hmac.DigestFinal();
// Check for error
str = BitConverter.ToString(hash);
if (str != results[1])
{
Console.WriteLine("{0} - Failed to calculate hash on a*1000", digest.Name);
Console.WriteLine("got {0} instead of {1}", str, results[1]);
}
else
{
Console.WriteLine("{0} - Test 2 passed.", digest.Name);
}
}
}
private void CompareBlocks(HmacAlg Algorithm)
{
if (Algorithm == HmacAlg.Sha256Hmac)
{
byte[] hashKey = new byte[32];
byte[] buffer = new byte[640];
byte[] hash1 = new byte[32];
byte[] hash2 = new byte[32];
using (System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider())
{
rng.GetBytes(hashKey);
rng.GetBytes(buffer);
}
using (System.Security.Cryptography.HMACSHA256 hmac = new System.Security.Cryptography.HMACSHA256(hashKey))
hash1 = hmac.ComputeHash(buffer);
// test 1: HMAC interface
HMAC hmac1 = new HMAC(new SHA256Digest());
hmac1.Init(hashKey);
hmac1.BlockUpdate(buffer, 0, buffer.Length);
hmac1.DoFinal(hash2, 0);
if (!Compare.AreEqual(hash2, hash1))
throw new Exception("hmac is not equal!");
// test 2: class with dofinal
using (SHA256HMAC hmac = new SHA256HMAC())
{
hmac.Init(hashKey);
hmac.BlockUpdate(buffer, 0, buffer.Length);
hmac.DoFinal(hash2, 0);
}
if (!Compare.AreEqual(hash2, hash1))
throw new Exception("hmac1 is not equal!");
// test 3: class with computemac
using (SHA256HMAC hmac = new SHA256HMAC(hashKey))
hash2 = hmac.ComputeMac(buffer);
if (!Compare.AreEqual(hash2, hash1))
throw new Exception("hmac2 is not equal!");
}
else
{
// SHA512 //
byte[] hash1 = new byte[64];
byte[] hash2 = new byte[64];
byte[] hashKey = new byte[64];
byte[] buffer = new byte[128];
using (System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider())
{
rng.GetBytes(hashKey);
rng.GetBytes(buffer);
}
using (System.Security.Cryptography.HMACSHA512 hmac = new System.Security.Cryptography.HMACSHA512(hashKey))
hash1 = hmac.ComputeHash(buffer);
// test 1: HMAC interface
HMAC hmac1 = new HMAC(new SHA512Digest());
hmac1.Init(hashKey);
hmac1.BlockUpdate(buffer, 0, buffer.Length);
hmac1.DoFinal(hash2, 0);
if (!Compare.AreEqual(hash2, hash1))
throw new Exception("hmac1 is not equal!");
// test 2: class with dofinal
using (SHA512HMAC hmac = new SHA512HMAC())
{
hmac.Init(hashKey);
hmac.BlockUpdate(buffer, 0, buffer.Length);
hmac.DoFinal(hash2, 0);
}
if (!Compare.AreEqual(hash2, hash1))
throw new Exception("hmac1 is not equal!");
// test 3: class with computemac
using (SHA512HMAC hmac = new SHA512HMAC(hashKey))
hash2 = hmac.ComputeMac(buffer);
if (!Compare.AreEqual(hash2, hash1))
throw new Exception("hmac2 is not equal!");
}
}
private void CompareBlocks(HmacAlg Algorithm)
{
if (Algorithm == HmacAlg.Sha256Hmac)
{
byte[] hashKey = new byte[32];
byte[] buffer = new byte[640];
byte[] hash1 = new byte[32];
byte[] hash2 = new byte[32];
using (System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider())
{
rng.GetBytes(hashKey);
rng.GetBytes(buffer);
}
using (System.Security.Cryptography.HMACSHA256 hmac = new System.Security.Cryptography.HMACSHA256(hashKey))
hash1 = hmac.ComputeHash(buffer);
// test 1: HMAC interface
HMAC hmac1 = new HMAC(new SHA256Digest());
hmac1.Init(hashKey);
hmac1.BlockUpdate(buffer, 0, buffer.Length);
hmac1.DoFinal(hash2, 0);
if (!Compare.AreEqual(hash2, hash1))
{
throw new Exception("hmac is not equal!");
}
// test 2: class with dofinal
using (SHA256HMAC hmac = new SHA256HMAC())
{
hmac.Init(hashKey);
hmac.BlockUpdate(buffer, 0, buffer.Length);
hmac.DoFinal(hash2, 0);
}
if (!Compare.AreEqual(hash2, hash1))
{
throw new Exception("hmac1 is not equal!");
}
// test 3: class with computemac
using (SHA256HMAC hmac = new SHA256HMAC(hashKey))
hash2 = hmac.ComputeMac(buffer);
if (!Compare.AreEqual(hash2, hash1))
{
throw new Exception("hmac2 is not equal!");
}
}
else
{
// SHA512 //
byte[] hash1 = new byte[64];
byte[] hash2 = new byte[64];
byte[] hashKey = new byte[64];
byte[] buffer = new byte[128];
using (System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider())
{
rng.GetBytes(hashKey);
rng.GetBytes(buffer);
}
using (System.Security.Cryptography.HMACSHA512 hmac = new System.Security.Cryptography.HMACSHA512(hashKey))
hash1 = hmac.ComputeHash(buffer);
// test 1: HMAC interface
HMAC hmac1 = new HMAC(new SHA512Digest());
hmac1.Init(hashKey);
hmac1.BlockUpdate(buffer, 0, buffer.Length);
hmac1.DoFinal(hash2, 0);
if (!Compare.AreEqual(hash2, hash1))
{
throw new Exception("hmac1 is not equal!");
}
// test 2: class with dofinal
using (SHA512HMAC hmac = new SHA512HMAC())
{
hmac.Init(hashKey);
hmac.BlockUpdate(buffer, 0, buffer.Length);
hmac.DoFinal(hash2, 0);
}
if (!Compare.AreEqual(hash2, hash1))
{
throw new Exception("hmac1 is not equal!");
}
// test 3: class with computemac
using (SHA512HMAC hmac = new SHA512HMAC(hashKey))
hash2 = hmac.ComputeMac(buffer);
if (!Compare.AreEqual(hash2, hash1))
{
throw new Exception("hmac2 is not equal!");
}
}
}