Examples with Cipher javax.crypto.Cipher used on opensource projects

Example 41 with Cipher

use of javax.crypto.Cipher in project XobotOS by xamarin.

the class PEMUtilities method crypt.

static byte[] crypt(boolean encrypt, Provider provider, byte[] bytes, char[] password, String dekAlgName, byte[] iv) throws IOException {
    AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
    String alg;
    String blockMode = "CBC";
    String padding = "PKCS5Padding";
    Key sKey;
    // Figure out block mode and padding.
    if (dekAlgName.endsWith("-CFB")) {
        blockMode = "CFB";
        padding = "NoPadding";
    }
    if (dekAlgName.endsWith("-ECB") || "DES-EDE".equals(dekAlgName) || "DES-EDE3".equals(dekAlgName)) {
        // ECB is actually the default (though seldom used) when OpenSSL
        // uses DES-EDE (des2) or DES-EDE3 (des3).
        blockMode = "ECB";
        paramSpec = null;
    }
    if (dekAlgName.endsWith("-OFB")) {
        blockMode = "OFB";
        padding = "NoPadding";
    }
    // Figure out algorithm and key size.
    if (dekAlgName.startsWith("DES-EDE")) {
        alg = "DESede";
        // "DES-EDE" is actually des2 in OpenSSL-speak!
        // "DES-EDE3" is des3.
        boolean des2 = !dekAlgName.startsWith("DES-EDE3");
        sKey = getKey(password, alg, 24, iv, des2);
    } else if (dekAlgName.startsWith("DES-")) {
        alg = "DES";
        sKey = getKey(password, alg, 8, iv);
    } else if (dekAlgName.startsWith("BF-")) {
        alg = "Blowfish";
        sKey = getKey(password, alg, 16, iv);
    } else if (dekAlgName.startsWith("RC2-")) {
        alg = "RC2";
        int keyBits = 128;
        if (dekAlgName.startsWith("RC2-40-")) {
            keyBits = 40;
        } else if (dekAlgName.startsWith("RC2-64-")) {
            keyBits = 64;
        }
        sKey = getKey(password, alg, keyBits / 8, iv);
        if (// ECB block mode
        paramSpec == null) {
            paramSpec = new RC2ParameterSpec(keyBits);
        } else {
            paramSpec = new RC2ParameterSpec(keyBits, iv);
        }
    } else if (dekAlgName.startsWith("AES-")) {
        alg = "AES";
        byte[] salt = iv;
        if (salt.length > 8) {
            salt = new byte[8];
            System.arraycopy(iv, 0, salt, 0, 8);
        }
        int keyBits;
        if (dekAlgName.startsWith("AES-128-")) {
            keyBits = 128;
        } else if (dekAlgName.startsWith("AES-192-")) {
            keyBits = 192;
        } else if (dekAlgName.startsWith("AES-256-")) {
            keyBits = 256;
        } else {
            throw new EncryptionException("unknown AES encryption with private key");
        }
        sKey = getKey(password, "AES", keyBits / 8, salt);
    } else {
        throw new EncryptionException("unknown encryption with private key");
    }
    String transformation = alg + "/" + blockMode + "/" + padding;
    try {
        Cipher c = Cipher.getInstance(transformation, provider);
        int mode = encrypt ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE;
        if (// ECB block mode
        paramSpec == null) {
            c.init(mode, sKey);
        } else {
            c.init(mode, sKey, paramSpec);
        }
        return c.doFinal(bytes);
    } catch (Exception e) {
        throw new EncryptionException("exception using cipher - please check password and data.", e);
    }
}

Example 42 with Cipher

use of javax.crypto.Cipher in project ZI by yixia.

the class Crypto method rsaEncrypt.

public String rsaEncrypt(InputStream keyStream, byte[] data) {
    try {
        PublicKey pubKey = readKeyFromStream(keyStream);
        Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        byte[] cipherData = cipher.doFinal(data);
        return Base64.encodeToString(cipherData, Base64.NO_WRAP);
    } catch (Exception e) {
        Log.e("rsaEncrypt", e);
        return "";
    }
}

Example 43 with Cipher

use of javax.crypto.Cipher in project WordPress-Android by wordpress-mobile.

the class WPLegacyMigrationUtils method decryptPassword.

private static String decryptPassword(String encryptedPwd) {
    try {
        DESKeySpec keySpec = new DESKeySpec(DEPRECATED_DB_PASSWORD_SECRET.getBytes("UTF-8"));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey key = keyFactory.generateSecret(keySpec);
        byte[] encryptedWithoutB64 = Base64.decode(encryptedPwd, Base64.DEFAULT);
        Cipher cipher = Cipher.getInstance("DES");
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] plainTextPwdBytes = cipher.doFinal(encryptedWithoutB64);
        return new String(plainTextPwdBytes);
    } catch (Exception e) {
    }
    return encryptedPwd;
}

Example 44 with Cipher

use of javax.crypto.Cipher in project translationstudio8 by heartsome.

the class InstallKeyEncrypt method decrypt.

public static byte[] decrypt(byte[] srcBytes) throws Exception {
    PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKey);
    KeyFactory kf = KeyFactory.getInstance(algorithm);
    PrivateKey keyPrivate = kf.generatePrivate(keySpec);
    Cipher cipher = Cipher.getInstance(algorithm, new org.bouncycastle.jce.provider.BouncyCastleProvider());
    cipher.init(Cipher.DECRYPT_MODE, keyPrivate);
    int blockSize = cipher.getBlockSize();
    ByteArrayOutputStream bout = new ByteArrayOutputStream(blockSize);
    int j = 0;
    while (srcBytes.length - j * blockSize > 0) {
        byte[] temp = cipher.doFinal(srcBytes, j * blockSize, blockSize);
        bout.write(temp);
        j++;
    }
    return bout.toByteArray();
}

Example 45 with Cipher

use of javax.crypto.Cipher in project platformlayer by platformlayer.

the class AesCbcUtils method buildDecryptor.

public static Cipher buildDecryptor(SecretKey key) {
    Cipher cipher = getCipher();
    CryptoUtils.initDecrypt(cipher, key);
    return cipher;
}