protected void decrypt()

in src/main/java/org/apache/commons/crypto/stream/PositionedCryptoInputStream.java [213:242]

• 26 lines of code
• 2 McCabe index (conditional complexity)

    protected void decrypt(final long position, final byte[] buffer, final int offset, final int length)
            throws IOException {
        final ByteBuffer inByteBuffer = getBuffer();
        final ByteBuffer outByteBuffer = getBuffer();
        CipherState state = null;
        try {
            state = getCipherState();
            final byte[] iv = getInitIV().clone();
            resetCipher(state, position, iv);
            byte padding = getPadding(position);
            inByteBuffer.position(padding); // Set proper position for input data.

            int n = 0;
            while (n < length) {
                final int toDecrypt = Math.min(length - n, inByteBuffer.remaining());
                inByteBuffer.put(buffer, offset + n, toDecrypt);

                // Do decryption
                decrypt(state, inByteBuffer, outByteBuffer, padding);

                outByteBuffer.get(buffer, offset + n, toDecrypt);
                n += toDecrypt;
                padding = postDecryption(state, inByteBuffer, position + n, iv);
            }
        } finally {
            returnToPool(inByteBuffer);
            returnToPool(outByteBuffer);
            returnToPool(state);
        }
    }