C# 要解密的数据长度无效
我正在尝试解密字节数组,但出现以下错误: 要解密的数据长度无效 此时会发生错误:C# 要解密的数据长度无效,c#,encryption,C#,Encryption,我正在尝试解密字节数组,但出现以下错误: 要解密的数据长度无效 此时会发生错误: int decryptedByteCount = cryptoStream .Read(plainTextBytes, 0, plainTextBytes.Length); 这是完整的代码 public static byte[] Decrypt(byte[] encryptedBytes, string key) { string initVector =
int decryptedByteCount = cryptoStream
.Read(plainTextBytes, 0, plainTextBytes.Length);
这是完整的代码
public static byte[] Decrypt(byte[] encryptedBytes, string key) {
string initVector = "@1B2c3D4e5F6g7H8";
string saltValue = "s@1tValue";
string passPhrase = key;//"s@1tValue";
string hashAlgorithm = "SHA1";
int passwordIterations = 2;
int keySize = 128;
// Convert strings defining encryption key characteristics into byte
// arrays. Let us assume that strings only contain ASCII codes.
// If strings include Unicode characters, use Unicode, UTF7, or UTF8
// encoding.
byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);
// Convert our ciphertext into a byte array.
byte[] cipherTextBytes = encryptedBytes;
// First, we must create a password, from which the key will be
// derived. This password will be generated from the specified
// passphrase and salt value. The password will be created using
// the specified hash algorithm. Password creation can be done in
// several iterations.
PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, saltValueBytes, hashAlgorithm, passwordIterations);
// Use the password to generate pseudo-random bytes for the encryption
// key. Specify the size of the key in bytes (instead of bits).
byte[] keyBytes = password.GetBytes(keySize / 8);
// Create uninitialized Rijndael encryption object.
TripleDESCryptoServiceProvider symmetricKey = new TripleDESCryptoServiceProvider();
// It is reasonable to set encryption mode to Cipher Block Chaining
// (CBC). Use default options for other symmetric key parameters.
symmetricKey.Mode = CipherMode.CBC;
// Generate decryptor from the existing key bytes and initialization
// vector. Key size will be defined based on the number of the key
// bytes.
ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
// Define memory stream which will be used to hold encrypted data.
MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
// Define cryptographic stream (always use Read mode for encryption).
CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
// Since at this point we don't know what the size of decrypted data
// will be, allocate the buffer long enough to hold ciphertext;
// plaintext is never longer than ciphertext.
byte[] plainTextBytes = new byte[cipherTextBytes.Length];
// Start decrypting.
int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
// Close both streams.
memoryStream.Close();
cryptoStream.Close();
// Convert decrypted data into a string.
// Let us assume that the original plaintext string was UTF8-encoded.
string plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
// Return decrypted string.
//return plainText;
return plainTextBytes;
}
错误就在这里
MemoryStream fileStreamIn = new MemoryStream(buffer);
ZipInputStream zipInStream = new ZipInputStream(fileStreamIn);
ZipEntry entry = zipInStream.GetNextEntry();
MemoryStream fileStreamOut = new MemoryStream();
int size;
byte[] bufferOut = new byte[buffer.Length];
do {
size = zipInStream.Read(bufferOut, 0, bufferOut.Length);
fileStreamOut.Write(bufferOut, 0, size);
} while (size > 0);
zipInStream.Close();
fileStreamOut.Close();
fileStreamIn.Close();
return bufferOut;
这是解压方法,缓冲区的大小比应该的要大。旁注:我知道有人教你“注释代码”,但请只在有用的时候才这样做
//关闭两个流
是一个完全无用的注释,只会使代码混乱。在这种情况下,您的注释应用于的代码是自注释。我知道流正在关闭,为什么要重复这一点?您还应该考虑使用a来处理任何IDisposable
(如您的流),因为这将保证即使发生异常,流也会关闭。您确定加密端使用相同的参数吗?它也是CBC模式下的TripleDES算法?你知道是否使用了填充方案,如果是,是哪一种?