AES暗号化は、java /アンドロイド

Question

で快活なお城を使用したCBCおよびPKCS5/7Paddingを使用して、私は、Java弾む城は、このガイドにhttps://www.bouncycastle.org/fips/BCUserGuide.pdf

を見つけた私は、CBCおよびPKCS5/7Paddingを使用して、次の例を実行するために3.3.1 AES暗号化を試してみました：

static byte[] encryptBytes(FipsOutputEncryptor outputEncryptor, byte[] plainText) throws IOException 
{ 
ByteArrayOutputStream bOut = new ByteArrayOutputStream(); 
CipherOutputStream encOut = outputEncryptor.getEncryptingStream(bOut); 
encOut.update(plainText); 
encOut.close(); 
return bOut.toByteArray(); 
} 

static byte[] decryptBytes(FipsInputDecryptor inputDecryptor, 
byte[] cipherText) throws IOException 
{ 
ByteArrayOutputStream bOut = new ByteArrayOutputStream(); 
InputStream encIn = inputDecryptor.getDecryptingStream(
new ByteArrayInputStream(cipherText)); 
int ch; 
while ((ch = encIn.read()) >= 0) 
{ 
bOut.write(ch); 
} 
return bOut.toByteArray(); 
} 


// 3.3.1 AES Encryption using CBC and PKCS5/7Padding 
    // ensure a FIPS DRBG in use. 
    CryptoServicesRegistrar.setSecureRandom(
    FipsDRBG.SHA512_HMAC.fromEntropySource(
    new BasicEntropySourceProvider(new SecureRandom(), true)) 
    .build(null, true)); 
    byte[] iv = new byte[16]; 
    CryptoServicesRegistrar.getSecureRandom().nextBytes(iv); 
    FipsSymmetricKeyGenerator<SymmetricSecretKey> keyGen = 
    new FipsAES.KeyGenerator(128, 
    CryptoServicesRegistrar.getSecureRandom()); 
    SymmetricSecretKey key = keyGen.generateKey(); 
    FipsSymmetricOperatorFactory<FipsAES.Parameters> fipsSymmetricFactory = 
    new FipsAES.OperatorFactory(); 
    FipsOutputEncryptor<FipsAES.Parameters> outputEncryptor = 
    fipsSymmetricFactory.createOutputEncryptor(key, 
    FipsAES.CBCwithPKCS7.withIV(iv)); 

    byte[] output = encryptBytes(outputEncryptor, new byte[16]); 
    FipsInputDecryptor<FipsAES.Parameters> inputDecryptor = 
    fipsSymmetricFactory.createInputDecryptor(key, 
    FipsAES.CBCwithPKCS7.withIV(iv)); 
    byte[] plain = decryptBytes(inputDecryptor, output); 

とコードはコンパイルされません。

私は、ライブラリを使用する理由は、私のアンドロイドアプリケーションでAesCbcPkcs7を統合することであるクラスパス

bcprov-jdk15on-155.jar 
bcmail-jdk15on-155.jar 
bcpg-jdk15on-155.jar 
bcpkix-jdk15on-155.jar 

に次のライブラリを追加しました。上記の例をコンパイルするためのヒントを教えてください。

よろしく、 アウレリアヌス

Answer 1

私は次のコードでテスト - 快活なお城なし - と完璧に動作します。これらの

import android.util.Base64; 

import java.io.IOException; 
import java.io.UnsupportedEncodingException; 
import java.security.GeneralSecurityException; 
import java.security.InvalidAlgorithmParameterException; 
import java.security.InvalidKeyException; 
import java.security.KeyException; 
import java.security.NoSuchAlgorithmException; 

import javax.crypto.BadPaddingException; 
import javax.crypto.Cipher; 
import javax.crypto.IllegalBlockSizeException; 
import javax.crypto.NoSuchPaddingException; 
import javax.crypto.spec.IvParameterSpec; 
import javax.crypto.spec.SecretKeySpec; 

/** 
* Created by aurelian.rosca. 
*/ 
public class EncryptionProvider2 { 
    private final String characterEncoding = "UTF-8"; 
    private final String cipherTransformation = "AES/CBC/PKCS5Padding"; 
    private final String aesEncryptionAlgorithm = "AES"; 

    public byte[] decrypt(byte[] cipherText, byte[] key, byte [] initialVector) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException 
    { 
     Cipher cipher = Cipher.getInstance(cipherTransformation); 
     SecretKeySpec secretKeySpecy = new SecretKeySpec(key, aesEncryptionAlgorithm); 
     IvParameterSpec ivParameterSpec = new IvParameterSpec(initialVector); 
     cipher.init(Cipher.DECRYPT_MODE, secretKeySpecy, ivParameterSpec); 
     cipherText = cipher.doFinal(cipherText); 
     return cipherText; 
    } 

    public byte[] encrypt(byte[] plainText, byte[] key, byte [] initialVector) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException 
    { 
     Cipher cipher = Cipher.getInstance(cipherTransformation); 
     SecretKeySpec secretKeySpec = new SecretKeySpec(key, aesEncryptionAlgorithm); 
     IvParameterSpec ivParameterSpec = new IvParameterSpec(initialVector); 
     cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec); 
     plainText = cipher.doFinal(plainText); 
     return plainText; 
    } 

    private byte[] getKeyBytes(String key) throws UnsupportedEncodingException { 
     byte[] keyBytes= new byte[16]; 
     byte[] parameterKeyBytes= key.getBytes(characterEncoding); 
     System.arraycopy(parameterKeyBytes, 0, keyBytes, 0, Math.min(parameterKeyBytes.length, keyBytes.length)); 
     return keyBytes; 
    } 


    public String encrypt(String plainText, String key) throws UnsupportedEncodingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException{ 
     byte[] plainTextbytes = plainText.getBytes(characterEncoding); 
     byte[] keyBytes = getKeyBytes(key); 
     return Base64.encodeToString(encrypt(plainTextbytes,keyBytes, keyBytes), Base64.NO_WRAP); 
    } 


    public String decrypt(String encryptedText, String key) throws KeyException, GeneralSecurityException, GeneralSecurityException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException, IOException { 
     byte[] cipheredBytes = Base64.decode(encryptedText, Base64.NO_WRAP); 
     byte[] keyBytes = getKeyBytes(key); 
     return new String(decrypt(cipheredBytes, keyBytes, keyBytes), characterEncoding); 
    } 
}