public static byte[] ElectronicCodebookModeDecrypt(byte[] ciphertext, byte[] key) { List <byte> listBytePlaintext = new List <byte>(); for (int i = 0; i < ciphertext.Length / 16; i++) { byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(ciphertext, i * 16, 16); listBytePlaintext.AddRange(AESFunctions.AES_Decrypt_block(bytesBlock, key)); } return(listBytePlaintext.ToArray()); }
public static byte[] CipherBlockChainingModeEncypt(byte[] plaintext, byte[] key, byte[] IV) { List <byte> listByteCiphertext = new List <byte>(); byte[] tmp = IV; for (int i = 0; i < plaintext.Length / 16; i++) { byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(plaintext, i * 16, 16); bytesBlock = HelpfulFunctions.ExclusiveOR(bytesBlock, tmp); tmp = AESFunctions.AES_encrypt_block(bytesBlock, key); listByteCiphertext.AddRange(tmp); } return(listByteCiphertext.ToArray()); }
public static byte[] PropagatingCipherBlockChainingModeDecrypt(byte[] ciphertext, byte[] key, byte[] IV) { List <byte> listBytePlaintext = new List <byte>(); byte[] tmp = IV; for (int i = 0; i < ciphertext.Length / 16; i++) { byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(ciphertext, i * 16, 16); byte[] bytesFromDecryptor = AESFunctions.AES_Decrypt_block(bytesBlock, key); byte[] plaintextBlock = HelpfulFunctions.ExclusiveOR(bytesFromDecryptor, tmp); listBytePlaintext.AddRange(plaintextBlock); tmp = HelpfulFunctions.ExclusiveOR(bytesBlock, plaintextBlock); } return(listBytePlaintext.ToArray()); }
public static byte[] CipherFeedbackModeDecrypt(byte[] ciphertext, byte[] key, byte[] IV) { List <byte> listBytePlaintext = new List <byte>(); //TODO byte[] tmp = IV; for (int i = 0; i < ciphertext.Length / 16; i++) { byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(ciphertext, i * 16, 16); byte[] bytesFromEncrypt = AESFunctions.AES_encrypt_block(tmp, key); listBytePlaintext.AddRange(HelpfulFunctions.ExclusiveOR(bytesFromEncrypt, bytesBlock)); tmp = bytesBlock; } return(listBytePlaintext.ToArray()); }
public static byte[] CounterModeEncypt(byte[] plaintext, byte[] key, byte[] nonce) { List <byte> listByteCiphertext = new List <byte>(); byte[] counter = { 0, 0, 0, 0, 0, 0, 0, 0 }; for (int i = 0; i < plaintext.Length / 16; i++) { List <byte> tmp = new List <byte>(); tmp.AddRange(nonce); tmp.AddRange(counter); byte[] bytesFromAES = AESFunctions.AES_encrypt_block(tmp.ToArray(), key); byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(plaintext, i * 16, 16); listByteCiphertext.AddRange(HelpfulFunctions.ExclusiveOR(bytesBlock, bytesFromAES)); counter = HelpfulFunctions.AddOneToByteArray(counter); } return(listByteCiphertext.ToArray()); }
public static byte[] PropagatingCipherBlockChainingMode2Decrypt(byte[] ciphertext, byte[] key, byte[] IV) { List <byte> listBytePlaintext = new List <byte>(); byte[] tmp = IV; byte[] tmp2 = { 1 }; for (int i = 0; i < ciphertext.Length / 16; i++) { byte[] bytesBlock = HelpfulFunctions.SubArrayDeepClone(ciphertext, i * 16, 16); byte[] tmp2Copy = tmp2; tmp2 = bytesBlock; bytesBlock = AESFunctions.AES_Decrypt_block(bytesBlock, key); if (i != 0) { bytesBlock = HelpfulFunctions.ExclusiveOR(bytesBlock, tmp2Copy); } tmp = HelpfulFunctions.ExclusiveOR(bytesBlock, tmp); listBytePlaintext.AddRange(tmp); } return(listBytePlaintext.ToArray()); }