public boolean compatibleWith(String provider) {
            // SunJCE doesn't support PKCS7Padding
            if (provider.equals("SunJCE") && transformation.endsWith("/PKCS7PADDING")) {
                return false;
            }
            if (provider.equals("BC")) {
                return isSupportedByBC(transformation);
            }
            return true;
        }
openssl rsautl -raw -sign -inkey rsa.key | recode ../x1 | sed 's/0x/(byte) 0x/g'
common/src/test/java/org/conscrypt/javax/crypto/CipherTest.java