// Based on #2 test vector from https://docs.microsoft.com/en-us/archive/blogs/openspecification/encryption-in-smb-3-0-a-protocol-perspective
public void TestDecryption()
{
byte[] key = new byte[] { 0x8F, 0xE2, 0xB5, 0x7E, 0xC3, 0x4D, 0x2D, 0xB5, 0xB1, 0xA9, 0x72, 0x7F, 0x52, 0x6B, 0xBD, 0xB5 };
byte[] nonce = new byte[] { 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00 };
byte[] signature = new byte[] { 0xA6, 0x01, 0x55, 0x30, 0xA1, 0x8F, 0x6D, 0x9A, 0xFF, 0xE2, 0x2A, 0xFA, 0xE8, 0xE6, 0x64, 0x84 };
byte[] associatedData = new byte[] { 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x14, 0x00, 0xE4, 0x08, 0x00,
0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x11, 0x00, 0x00, 0x14, 0x00, 0xE4, 0x08, 0x00 };
byte[] encyrptedData = new byte[] { 0xDB, 0xF4, 0x64, 0x35, 0xC5, 0xF1, 0x41, 0x69, 0x29, 0x3C, 0xE0, 0x79, 0xE3, 0x44, 0x47, 0x9B,
0xF6, 0x70, 0x22, 0x7E, 0x49, 0x87, 0x3F, 0x45, 0x86, 0x72, 0xC3, 0x09, 0x8D, 0xAC, 0x46, 0x7D,
0xD5, 0x80, 0x9F, 0x36, 0x9D, 0x67, 0x40, 0x91, 0x66, 0x51, 0x57, 0x87, 0x14, 0x83, 0xE0, 0x1F,
0x7B, 0xEC, 0xD0, 0x20, 0x64, 0xEA, 0xC3, 0xE2, 0x35, 0xF9, 0x13, 0x66, 0x8B, 0xBC, 0x2F, 0x09,
0x79, 0x80, 0xD4, 0xB3, 0x78, 0xF1, 0x99, 0x3E, 0xFF, 0x6E, 0x60, 0xD1, 0x77, 0x30, 0x9E, 0x5B };
byte[] expectedData = new byte[] { 0xFE, 0x53, 0x4D, 0x42, 0x40, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09, 0x00, 0x21, 0x00,
0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xFF, 0xFE, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x14, 0x00, 0xE4, 0x08, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x11, 0x00, 0x00, 0x00, 0x17, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
byte[] data = AesCcm.DecryptAndAuthenticate(key, nonce, encyrptedData, associatedData, signature);
Assert.True(ByteUtils.AreByteArraysEqual(expectedData, data));
}
public void TestDecryption_Rfc3610_Packet_Vector1()
{
byte[] key = new byte[] { 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF };
byte[] nonce = new byte[] { 0x00, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5 };
byte[] associatedData = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
byte[] encryptedData = new byte[] { 0x58, 0x8C, 0x97, 0x9A, 0x61, 0xC6, 0x63, 0xD2, 0xF0, 0x66, 0xD0, 0xC2, 0xC0, 0xF9, 0x89, 0x80,
0x6D, 0x5F, 0x6B, 0x61, 0xDA, 0xC3, 0x84 };
byte[] signature = new byte[] { 0x17, 0xE8, 0xD1, 0x2C, 0xFD, 0xF9, 0x26, 0xE0 };
byte[] expectedData = new byte[] { 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E };
byte[] data = AesCcm.DecryptAndAuthenticate(key, nonce, encryptedData, associatedData, signature);
Assert.True(ByteUtils.AreByteArraysEqual(expectedData, data));
}
public static byte[] DecryptMessage(byte[] key, SMB2TransformHeader transformHeader, byte[] encryptedMessage)
{
byte[] associatedData = transformHeader.GetAssociatedData();
byte[] aesCcmNonce = ByteReader.ReadBytes(transformHeader.Nonce, 0, AesCcmNonceLength);
return(AesCcm.DecryptAndAuthenticate(key, aesCcmNonce, encryptedMessage, associatedData, transformHeader.Signature));
}