Examples with GCMParameterSpec javax.crypto.spec.GCMParameterSpec used on opensource projects

Example 46 with GCMParameterSpec

use of javax.crypto.spec.GCMParameterSpec in project libsignal-service-java by signalapp.

the class ContactDiscoveryCipher method decrypt.

private byte[] decrypt(byte[] key, byte[] iv, byte[] ciphertext, byte[] tag) throws InvalidCiphertextException {
    try {
        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"), new GCMParameterSpec(128, iv));
        return cipher.doFinal(ByteUtil.combine(ciphertext, tag));
    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidAlgorithmParameterException | IllegalBlockSizeException e) {
        throw new AssertionError(e);
    } catch (InvalidKeyException | BadPaddingException e) {
        throw new InvalidCiphertextException(e);
    }
}

Example 47 with GCMParameterSpec

use of javax.crypto.spec.GCMParameterSpec in project libsignal-service-java by signalapp.

the class ProfileCipher method decryptName.

public byte[] decryptName(byte[] input) throws InvalidCiphertextException {
    try {
        if (input.length < 12 + 16 + 1) {
            throw new InvalidCiphertextException("Too short: " + input.length);
        }
        byte[] nonce = new byte[12];
        System.arraycopy(input, 0, nonce, 0, nonce.length);
        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"), new GCMParameterSpec(128, nonce));
        byte[] paddedPlaintext = cipher.doFinal(input, nonce.length, input.length - nonce.length);
        int plaintextLength = 0;
        for (int i = paddedPlaintext.length - 1; i >= 0; i--) {
            if (paddedPlaintext[i] != (byte) 0x00) {
                plaintextLength = i + 1;
                break;
            }
        }
        byte[] plaintext = new byte[plaintextLength];
        System.arraycopy(paddedPlaintext, 0, plaintext, 0, plaintextLength);
        return plaintext;
    } catch (NoSuchAlgorithmException | InvalidAlgorithmParameterException | NoSuchPaddingException | IllegalBlockSizeException e) {
        throw new AssertionError(e);
    } catch (InvalidKeyException | BadPaddingException e) {
        throw new InvalidCiphertextException(e);
    }
}

Example 48 with GCMParameterSpec

use of javax.crypto.spec.GCMParameterSpec in project Signal-Android by signalapp.

the class AESCipher method decrypt.

static byte[] decrypt(byte[] key, byte[] iv, byte[] ciphertext, byte[] tag) throws InvalidCiphertextException {
    try {
        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"), new GCMParameterSpec(TAG_LENGTH_BITS, iv));
        return cipher.doFinal(ByteUtil.combine(ciphertext, tag));
    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidAlgorithmParameterException | IllegalBlockSizeException e) {
        throw new AssertionError(e);
    } catch (InvalidKeyException | BadPaddingException e) {
        throw new InvalidCiphertextException(e);
    }
}

Example 49 with GCMParameterSpec

use of javax.crypto.spec.GCMParameterSpec in project Signal-Android by signalapp.

the class SignalStorageCipher method encrypt.

public static byte[] encrypt(StorageCipherKey key, byte[] data) {
    try {
        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
        byte[] iv = Util.getSecretBytes(IV_LENGTH);
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key.serialize(), "AES"), new GCMParameterSpec(128, iv));
        byte[] ciphertext = cipher.doFinal(data);
        return Util.join(iv, ciphertext);
    } catch (NoSuchAlgorithmException | java.security.InvalidKeyException | InvalidAlgorithmParameterException | NoSuchPaddingException | BadPaddingException | IllegalBlockSizeException e) {
        throw new AssertionError(e);
    }
}

Example 50 with GCMParameterSpec

use of javax.crypto.spec.GCMParameterSpec in project Signal-Android by signalapp.

the class UnidentifiedAccess method deriveAccessKeyFrom.

public static byte[] deriveAccessKeyFrom(ProfileKey profileKey) {
    try {
        byte[] nonce = new byte[12];
        byte[] input = new byte[16];
        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(profileKey.serialize(), "AES"), new GCMParameterSpec(128, nonce));
        byte[] ciphertext = cipher.doFinal(input);
        return ByteUtil.trim(ciphertext, 16);
    } catch (NoSuchAlgorithmException | InvalidKeyException | NoSuchPaddingException | InvalidAlgorithmParameterException | BadPaddingException | IllegalBlockSizeException e) {
        throw new AssertionError(e);
    }
}