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

Example 31 with Cipher

use of javax.crypto.Cipher in project wycheproof by google.

the class AesGcmTest method testByteBufferTooShort.

public void testByteBufferTooShort() throws Exception {
    for (GcmTestVector test : getTestVectors()) {
        // Encryption
        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
        ByteBuffer ptBuffer = ByteBuffer.wrap(test.pt);
        ByteBuffer ctBuffer = ByteBuffer.allocate(test.ct.length - 1);
        cipher.init(Cipher.ENCRYPT_MODE, test.key, test.parameters);
        cipher.updateAAD(test.aad);
        try {
            cipher.doFinal(ptBuffer, ctBuffer);
            fail("This should not work");
        } catch (ShortBufferException ex) {
        // expected
        }
        // Decryption
        ctBuffer = ByteBuffer.wrap(test.ct);
        ByteBuffer decrypted = ByteBuffer.allocate(test.pt.length - 1);
        cipher.init(Cipher.DECRYPT_MODE, test.key, test.parameters);
        cipher.updateAAD(test.aad);
        try {
            cipher.doFinal(ctBuffer, decrypted);
            fail("This should not work");
        } catch (ShortBufferException ex) {
        // expected
        }
    }
}

Example 32 with Cipher

use of javax.crypto.Cipher in project wycheproof by google.

the class CipherInputStreamTest method testDecrypt.

/** JDK-8016249: CipherInputStream in decrypt mode fails on close with AEAD ciphers */
@SuppressWarnings("InsecureCryptoUsage")
public void testDecrypt(Iterable<TestVector> tests) throws Exception {
    for (TestVector t : tests) {
        Cipher cipher = Cipher.getInstance(t.algorithm);
        cipher.init(Cipher.DECRYPT_MODE, t.key, t.params);
        cipher.updateAAD(t.aad);
        InputStream is = new ByteArrayInputStream(t.ct);
        CipherInputStream cis = new CipherInputStream(is, cipher);
        byte[] result = new byte[t.pt.length];
        int totalLength = 0;
        int length = 0;
        do {
            length = cis.read(result, totalLength, result.length - totalLength);
            if (length > 0) {
                totalLength += length;
            }
        } while (length >= 0 && totalLength != result.length);
        assertEquals(-1, cis.read());
        cis.close();
        assertEquals(TestUtil.bytesToHex(t.pt), TestUtil.bytesToHex(result));
    }
}

Example 33 with Cipher

use of javax.crypto.Cipher in project wycheproof by google.

the class CipherOutputStreamTest method testCorruptDecryptEmpty.

@SuppressWarnings("InsecureCryptoUsage")
public void testCorruptDecryptEmpty(Iterable<TestVector> tests) throws Exception {
    for (TestVector t : tests) {
        Cipher cipher = Cipher.getInstance(t.algorithm);
        cipher.init(Cipher.DECRYPT_MODE, t.key, t.params);
        cipher.updateAAD(t.aad);
        byte[] ct = Arrays.copyOf(t.ct, t.ct.length);
        ct[ct.length - 1] ^= (byte) 1;
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        CipherOutputStream cos = new CipherOutputStream(os, cipher);
        cos.write(ct);
        try {
            // cos.close() should call cipher.doFinal().
            cos.close();
            byte[] decrypted = os.toByteArray();
            fail("this should fail; decrypted:" + TestUtil.bytesToHex(decrypted) + " pt: " + TestUtil.bytesToHex(t.pt));
        } catch (IOException ex) {
        // expected
        }
    }
}

Example 34 with Cipher

use of javax.crypto.Cipher in project keywhiz by square.

the class ContentCryptographer method gcm.

private byte[] gcm(Mode mode, String info, byte[] nonce, byte[] data) {
    try {
        Cipher cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM, encryptionProvider);
        SecretKey derivedKey = deriveKey(cipher.getBlockSize(), info);
        GCMParameterSpec gcmParameters = new GCMParameterSpec(TAG_BITS, nonce);
        cipher.init(mode.cipherMode, derivedKey, gcmParameters);
        return cipher.doFinal(data);
    } catch (IllegalBlockSizeException | InvalidAlgorithmParameterException | NoSuchPaddingException | NoSuchAlgorithmException | InvalidKeyException | BadPaddingException e) {
        throw Throwables.propagate(e);
    }
}

Example 35 with Cipher

use of javax.crypto.Cipher in project android-delicious by lexs.

the class ObscuredSharedPreferences method decrypt.

protected String decrypt(String value) {
    try {
        final byte[] bytes = value != null ? Base64.decode(value, Base64.DEFAULT) : new byte[0];
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(secret));
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        pbeCipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(getSalt(), 20));
        return new String(pbeCipher.doFinal(bytes), UTF8);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}