public static bool DecryptTrackFile(StreamUrl stream, string filepath)
{
try
{
if (!System.IO.File.Exists(filepath))
{
return(false);
}
if (stream.EncryptionKey.IsBlank())
{
return(true);
}
byte[] security_token = System.Convert.FromBase64String(stream.EncryptionKey);
byte[] iv = security_token.Skip(0).Take(16).ToArray();
byte[] str = security_token.Skip(16).ToArray();
byte[] dec = AESHelper.Decrypt(str, MASTER_KEY, iv);
byte[] key = dec.Skip(0).Take(16).ToArray();
byte[] nonce = dec.Skip(16).Take(8).ToArray();
byte[] nonce2 = new byte[16];
nonce.CopyTo(nonce2, 0);
byte[] txt = ReadFile(filepath);
AES_CTR tool = new AES_CTR(key, nonce2);
byte[] newt = tool.DecryptBytes(txt);
bool bfalg = WriteFile(filepath, newt);
return(bfalg);
}
catch
{
return(false);
}
}
public void TestDisposable()
{
// Arrange
byte[] key = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
byte[] initialCounter = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05 };
byte[] content = new byte[] { 11, 24, 22, 134, 234, 33, 4, 14, 34, 56, 23 };
int contentLength = content.Length;
byte[] encrypted = new byte[contentLength];
byte[] decrypted = new byte[contentLength];
// Act
using (AES_CTR forEncrypting = new AES_CTR(key, initialCounter))
{
forEncrypting.EncryptBytes(encrypted, content, contentLength);
}
using (AES_CTR forDecrypting = new AES_CTR(key, initialCounter))
{
forDecrypting.DecryptBytes(decrypted, encrypted, contentLength);
}
// Assert
CollectionAssert.AreEqual(content, decrypted);
}
public static bool DecryptTrackFile(StreamUrl stream, string filepath)
{
if (!File.Exists(filepath))
{
return(false);
}
if (stream.EncryptionKey.IsBlank())
{
return(true);
}
byte[] master_key = System.Convert.FromBase64String("UIlTTEMmmLfGowo/UC60x2H45W6MdGgTRfo/umg4754=");
byte[] security_token = System.Convert.FromBase64String(stream.EncryptionKey);
byte[] iv = security_token.Skip(0).Take(16).ToArray();
byte[] str = security_token.Skip(16).ToArray();
byte[] dec = AESHelper.Decrypt(str, master_key, iv);
byte[] key = dec.Skip(0).Take(16).ToArray();
byte[] nonce = dec.Skip(16).Take(8).ToArray();
byte[] nonce2 = new byte[16];
nonce.CopyTo(nonce2, 0);
byte[] txt = ReadFile(filepath);
AES_CTR tool = new AES_CTR(key, nonce2);
byte[] newt = tool.DecryptBytes(txt);
bool bfalg = WriteFile(filepath, newt);
return(bfalg);
}
public byte[] Decryptdata(byte[] encrypted, byte[] key, byte[] iv)
{
AES_CTR forEncrypting = new AES_CTR(key, iv);
byte[] plain = new byte[encrypted.Length];
forEncrypting.DecryptBytes(plain, encrypted);
return(plain);
}
public void Known_CTR_AES128DecryptTest()
{
// Arrange
// These are from https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf (F.5 CTR Example Vectors )
byte[] key = new byte[16] {
0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c
};
byte[] initialCounter = new byte[] { 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff };
byte[] bytesToDecrypt1 = new byte[] { 0x87, 0x4d, 0x61, 0x91, 0xb6, 0x20, 0xe3, 0x26, 0x1b, 0xef, 0x68, 0x64, 0x99, 0x0d, 0xb6, 0xce };
byte[] expectedOutput1 = new byte[] { 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a };
byte[] actualOutput1 = new byte[bytesToDecrypt1.Length];
byte[] bytesToDecrypt2 = new byte[] { 0x98, 0x06, 0xf6, 0x6b, 0x79, 0x70, 0xfd, 0xff, 0x86, 0x17, 0x18, 0x7b, 0xb9, 0xff, 0xfd, 0xff };
byte[] expectedOutput2 = new byte[] { 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51 };
byte[] actualOutput2 = new byte[bytesToDecrypt2.Length];
byte[] bytesToDecrypt3 = new byte[] { 0x5a, 0xe4, 0xdf, 0x3e, 0xdb, 0xd5, 0xd3, 0x5e, 0x5b, 0x4f, 0x09, 0x02, 0x0d, 0xb0, 0x3e, 0xab };
byte[] expectedOutput3 = new byte[] { 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef };
byte[] actualOutput3 = new byte[bytesToDecrypt3.Length];
byte[] bytesToDecrypt4 = new byte[] { 0x1e, 0x03, 0x1d, 0xda, 0x2f, 0xbe, 0x03, 0xd1, 0x79, 0x21, 0x70, 0xa0, 0xf3, 0x00, 0x9c, 0xee };
byte[] expectedOutput4 = new byte[] { 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 };
byte[] actualOutput4 = new byte[bytesToDecrypt4.Length];
// Act
AES_CTR aesCtr = new AES_CTR(key, initialCounter);
aesCtr.DecryptBytes(actualOutput1, bytesToDecrypt1, bytesToDecrypt1.Length);
aesCtr.DecryptBytes(actualOutput2, bytesToDecrypt2, bytesToDecrypt2.Length);
aesCtr.DecryptBytes(actualOutput3, bytesToDecrypt3, bytesToDecrypt3.Length);
aesCtr.DecryptBytes(actualOutput4, bytesToDecrypt4, bytesToDecrypt4.Length);
// Assert
CollectionAssert.AreEqual(expectedOutput1, actualOutput1);
CollectionAssert.AreEqual(expectedOutput2, actualOutput2);
CollectionAssert.AreEqual(expectedOutput3, actualOutput3);
CollectionAssert.AreEqual(expectedOutput4, actualOutput4);
}
public void Known_CTR_AES256DecryptTest()
{
// Arrange
// These are from https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf (F.5 CTR Example Vectors )
byte[] key = new byte[32] {
0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81, 0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4
};
byte[] initialCounter = new byte[] { 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff };
byte[] bytesToDecrypt1 = new byte[] { 0x60, 0x1e, 0xc3, 0x13, 0x77, 0x57, 0x89, 0xa5, 0xb7, 0xa7, 0xf5, 0x04, 0xbb, 0xf3, 0xd2, 0x28 };
byte[] expectedOutput1 = new byte[] { 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a };
byte[] actualOutput1 = new byte[bytesToDecrypt1.Length];
byte[] bytesToDecrypt2 = new byte[] { 0xf4, 0x43, 0xe3, 0xca, 0x4d, 0x62, 0xb5, 0x9a, 0xca, 0x84, 0xe9, 0x90, 0xca, 0xca, 0xf5, 0xc5 };
byte[] expectedOutput2 = new byte[] { 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51 };
byte[] actualOutput2 = new byte[bytesToDecrypt2.Length];
byte[] bytesToDecrypt3 = new byte[] { 0x2b, 0x09, 0x30, 0xda, 0xa2, 0x3d, 0xe9, 0x4c, 0xe8, 0x70, 0x17, 0xba, 0x2d, 0x84, 0x98, 0x8d };
byte[] expectedOutput3 = new byte[] { 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef };
byte[] actualOutput3 = new byte[bytesToDecrypt3.Length];
byte[] bytesToDecrypt4 = new byte[] { 0xdf, 0xc9, 0xc5, 0x8d, 0xb6, 0x7a, 0xad, 0xa6, 0x13, 0xc2, 0xdd, 0x08, 0x45, 0x79, 0x41, 0xa6 };
byte[] expectedOutput4 = new byte[] { 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 };
byte[] actualOutput4 = new byte[bytesToDecrypt4.Length];
// Act
AES_CTR aesCtr = new AES_CTR(key, initialCounter);
aesCtr.DecryptBytes(actualOutput1, bytesToDecrypt1, bytesToDecrypt1.Length);
aesCtr.DecryptBytes(actualOutput2, bytesToDecrypt2, bytesToDecrypt2.Length);
aesCtr.DecryptBytes(actualOutput3, bytesToDecrypt3, bytesToDecrypt3.Length);
aesCtr.DecryptBytes(actualOutput4, bytesToDecrypt4, bytesToDecrypt4.Length);
// Assert
CollectionAssert.AreEqual(expectedOutput1, actualOutput1);
CollectionAssert.AreEqual(expectedOutput2, actualOutput2);
CollectionAssert.AreEqual(expectedOutput3, actualOutput3);
CollectionAssert.AreEqual(expectedOutput4, actualOutput4);
}
public void Known_CTR_AES192DecryptTest()
{
// Arrange
// These are from https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf (F.5 CTR Example Vectors )
byte[] key = new byte[24] {
0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b, 0x80, 0x90, 0x79, 0xe5, 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b
};
byte[] initialCounter = new byte[] { 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff };
byte[] bytesToDecrypt1 = new byte[] { 0x1a, 0xbc, 0x93, 0x24, 0x17, 0x52, 0x1c, 0xa2, 0x4f, 0x2b, 0x04, 0x59, 0xfe, 0x7e, 0x6e, 0x0b };
byte[] expectedOutput1 = new byte[] { 0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a };
byte[] actualOutput1 = new byte[bytesToDecrypt1.Length];
byte[] bytesToDecrypt2 = new byte[] { 0x09, 0x03, 0x39, 0xec, 0x0a, 0xa6, 0xfa, 0xef, 0xd5, 0xcc, 0xc2, 0xc6, 0xf4, 0xce, 0x8e, 0x94 };
byte[] expectedOutput2 = new byte[] { 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51 };
byte[] actualOutput2 = new byte[bytesToDecrypt2.Length];
byte[] bytesToDecrypt3 = new byte[] { 0x1e, 0x36, 0xb2, 0x6b, 0xd1, 0xeb, 0xc6, 0x70, 0xd1, 0xbd, 0x1d, 0x66, 0x56, 0x20, 0xab, 0xf7 };
byte[] expectedOutput3 = new byte[] { 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef };
byte[] actualOutput3 = new byte[bytesToDecrypt3.Length];
byte[] bytesToDecrypt4 = new byte[] { 0x4f, 0x78, 0xa7, 0xf6, 0xd2, 0x98, 0x09, 0x58, 0x5a, 0x97, 0xda, 0xec, 0x58, 0xc6, 0xb0, 0x50 };
byte[] expectedOutput4 = new byte[] { 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10 };
byte[] actualOutput4 = new byte[bytesToDecrypt4.Length];
// Act
AES_CTR aesCtr = new AES_CTR(key, initialCounter);
aesCtr.DecryptBytes(actualOutput1, bytesToDecrypt1, bytesToDecrypt1.Length);
aesCtr.DecryptBytes(actualOutput2, bytesToDecrypt2, bytesToDecrypt2.Length);
aesCtr.DecryptBytes(actualOutput3, bytesToDecrypt3, bytesToDecrypt3.Length);
aesCtr.DecryptBytes(actualOutput4, bytesToDecrypt4, bytesToDecrypt4.Length);
// Assert
CollectionAssert.AreEqual(expectedOutput1, actualOutput1);
CollectionAssert.AreEqual(expectedOutput2, actualOutput2);
CollectionAssert.AreEqual(expectedOutput3, actualOutput3);
CollectionAssert.AreEqual(expectedOutput4, actualOutput4);
}
public void TestOverloadsNonPowerOfTwo()
{
// Arrange
Random rng = new Random(Seed: 1337);
byte[] key = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
byte[] initialCounter = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05 };
const int lengthOfData = 13339;
byte[] randomContent = new byte[lengthOfData];
byte[] encryptedContent1 = new byte[lengthOfData];
byte[] decryptedContent1 = new byte[lengthOfData];
byte[] encryptedContent2 = null;
byte[] decryptedContent2 = null;
byte[] encryptedContent3 = null;
byte[] decryptedContent3 = null;
AES_CTR forEncrypting1 = null;
AES_CTR forDecrypting1 = null;
AES_CTR forEncrypting2 = null;
AES_CTR forDecrypting2 = null;
AES_CTR forEncrypting3 = null;
AES_CTR forDecrypting3 = null;
// Act
rng.NextBytes(randomContent);
forEncrypting1 = new AES_CTR(key, initialCounter);
forDecrypting1 = new AES_CTR(key, initialCounter);
forEncrypting2 = new AES_CTR(key, initialCounter);
forDecrypting2 = new AES_CTR(key, initialCounter);
forEncrypting3 = new AES_CTR(key, initialCounter);
forDecrypting3 = new AES_CTR(key, initialCounter);
forEncrypting1.EncryptBytes(encryptedContent1, randomContent);
forDecrypting1.DecryptBytes(decryptedContent1, encryptedContent1);
encryptedContent2 = forEncrypting2.EncryptBytes(randomContent, randomContent.Length);
decryptedContent2 = forDecrypting2.DecryptBytes(encryptedContent2, encryptedContent2.Length);
encryptedContent3 = forEncrypting3.EncryptBytes(randomContent);
decryptedContent3 = forDecrypting3.DecryptBytes(encryptedContent3);
// Assert
CollectionAssert.AreEqual(randomContent, decryptedContent1);
CollectionAssert.AreNotEqual(randomContent, encryptedContent1);
CollectionAssert.AreEqual(randomContent, decryptedContent2);
CollectionAssert.AreNotEqual(randomContent, encryptedContent2);
CollectionAssert.AreEqual(randomContent, decryptedContent3);
CollectionAssert.AreNotEqual(randomContent, encryptedContent3);
}