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Rijndael .Net 암호화 파일과 .Net RSA XML Key가 Java에서 해독되도록 요청되었습니다.Rijndael을 사용하여 .Net에서 암호화 된 파일의 암호를 해독하는 중 오류가 발생했습니다.
나에게 제공되는 키는 256 비트입니다.
RSA XML 파일을 구문 분석하고 공개 키를 Java로 생성했습니다. 생성 된 키를 사용하여 암호 해독을 시도했지만 예외가 발생했습니다. Illegal Key Size, 제 Java 코드에서 잘못된 것 같습니다.
내 코드에 문제가 있는지 확인할 수있는 사람이 있습니까?
닷넷 암호화 코드 :
public static void EncryptFile(string fileIn, string fileOut,
string publicKeyName, string publicKeyFile)
{
try
{
// Read the public key from key file
StreamReader sr = new StreamReader(publicKeyFile);
string strKeyText = sr.ReadToEnd();
sr.Close();
//Initialize Key container and Crypto service provider
RSACryptoServiceProvider rsa;
CspParameters cspp = new CspParameters();
cspp.KeyContainerName = publicKeyName;
rsa = new RSACryptoServiceProvider(cspp);
rsa.FromXmlString(strKeyText);
rsa.PersistKeyInCsp = true;
// Create instance of Rijndael for
// symetric encryption of the data.
RijndaelManaged alg = new RijndaelManaged();
// Key size is set to 256 for strong encryption
alg.KeySize = 256;
alg.BlockSize = 256;
// Cipher Mode is set to CBC to process the file in chunks
alg.Mode = CipherMode.CBC;
// Set padding mode to process the last block of the file
alg.Padding = PaddingMode.ISO10126;
ICryptoTransform transform = alg.CreateEncryptor();
// Use RSACryptoServiceProvider to
// enrypt the Rijndael key.
byte[] KeyEncrypted = rsa.Encrypt(alg.Key, false);
// Create byte arrays to contain
// the length values of the key and IV.
int intKeyLength = KeyEncrypted.Length;
byte[] LenK = BitConverter.GetBytes(intKeyLength);
int intIVLength = alg.IV.Length;
byte[] LenIV = BitConverter.GetBytes(intIVLength);
using (FileStream fsOut = new FileStream(fileOut, FileMode.Create))
{
// Write the following to the FileStream
// for the encrypted file (fsOut):
// - length of the key
// - length of the IV
// - ecrypted key
// - the IV
// - the encrypted cipher content
fsOut.Write(LenK, 0, 4);
fsOut.Write(LenIV, 0, 4);
fsOut.Write(KeyEncrypted, 0, intKeyLength);
fsOut.Write(alg.IV, 0, intIVLength);
// Now write the cipher text using
// a CryptoStream for encrypting.
using (CryptoStream cs = new CryptoStream(fsOut, transform, CryptoStreamMode.Write))
{
// intBlockSizeBytes can be any arbitrary size.
int intBlockSizeBytes = alg.BlockSize/8;
byte[] DataBytes = new byte[intBlockSizeBytes];
int intBytesRead = 0;
using (FileStream fsIn = new FileStream(fileIn, FileMode.Open))
{
// By encrypting a chunk at
// a time, you can save memory
// and accommodate large files.
int intCount;
int intOffset = 0;
do
{
// if last block size is less than encryption chunk size
// use the last block size and padding character is used
// for remaining bytes
if (intBlockSizeBytes > (fsIn.Length - fsIn.Position))
{
intBlockSizeBytes = ((int)(fsIn.Length - fsIn.Position));
DataBytes = new byte[intBlockSizeBytes];
}
// read data bytes
intCount = fsIn.Read(DataBytes, 0, intBlockSizeBytes);
intOffset += intCount;
// write it into crypto stream
cs.Write(DataBytes, 0, intCount);
intBytesRead += intBlockSizeBytes;
} while (intCount > 0);
// close input file
fsIn.Close();
}
// close crypto stream
cs.FlushFinalBlock();
cs.Close();
}
// close output file
fsOut.Close();
}
}
catch
{
throw;
}
}
자바 코드 나는 그것을 해독하는 데 쓴 :
byte[] expBytes = Base64.decodeBase64(pkey.getExponentEle().trim());
byte[] modBytes = Base64.decodeBase64(pkey.getModulusEle().trim());
byte[] dBytes = Base64.decodeBase64(pkey.getdEle().trim());
BigInteger modules = new BigInteger(1, modBytes);
BigInteger exponent = new BigInteger(1, expBytes);
BigInteger d = new BigInteger(1, dBytes);
KeyFactory factory = KeyFactory.getInstance("RSA");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
RSAPublicKeySpec pubSpec = new RSAPublicKeySpec(modules, exponent);
PublicKey pubKey = factory.generatePublic(pubSpec);
final byte[] keyData = Arrays.copyOf(pubKey.getEncoded(), 256
/Byte.SIZE);
final byte[] ivBytes = Arrays.copyOf(keyData, cipher.getBlockSize());
AlgorithmParameterSpec paramSpec = new IvParameterSpec(ivBytes);
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(keyData, "AES"), paramSpec);
byte[] decrypted = cipher.doFinal(encrypted);
System.out.println("decrypted: " + new String(decrypted));
그때 나는 오류 Invalid AES key length: 162 bytes
cipher.init(Cipher.DECRYPT_MODE, pubKey);에 암호 초기화를 변경하는 경우