private static RSAPrivateCrtKeySpec getRSAKeySpec()

in aws-iot-device-sdk-java-samples/src/main/java/com/amazonaws/services/iot/client/sample/sampleUtil/PrivateKeyReader.java [173:198]

19 lines of code
2 McCabe index (conditional complexity)


    private static RSAPrivateCrtKeySpec getRSAKeySpec(byte[] keyBytes) throws IOException {

        DerParser parser = new DerParser(keyBytes);

        Asn1Object sequence = parser.read();
        if (sequence.getType() != DerParser.SEQUENCE)
            throw new IOException("Invalid DER: not a sequence"); //$NON-NLS-1$

        // Parse inside the sequence
        parser = sequence.getParser();

        parser.read(); // Skip version
        BigInteger modulus = parser.read().getInteger();
        BigInteger publicExp = parser.read().getInteger();
        BigInteger privateExp = parser.read().getInteger();
        BigInteger prime1 = parser.read().getInteger();
        BigInteger prime2 = parser.read().getInteger();
        BigInteger exp1 = parser.read().getInteger();
        BigInteger exp2 = parser.read().getInteger();
        BigInteger crtCoef = parser.read().getInteger();

        RSAPrivateCrtKeySpec keySpec = new RSAPrivateCrtKeySpec(modulus, publicExp, privateExp, prime1, prime2, exp1,
                exp2, crtCoef);

        return keySpec;
    }