Package com.github.f4b6a3.uuid.util.internal

Class RandomUtil

    • Field Detail

      • SHARED_RANDOM

        protected static final SecureRandom SHARED_RANDOM

    • Method Detail

      • nextInt

        public static int nextInt()

      • nextLong

        public static long nextLong()

      • getSecureRandom

        public static SecureRandom getSecureRandom()
        Returns a new instance of SecureRandom. It tries to create an instance with the algorithm name specified in the system property `uuidcreator.securerandom` or in the environment variable `UUIDCREATOR_SECURERANDOM`. If the algorithm name is not supported by the runtime, it returns an instance with the default algorithm. It can be useful to make use of SHA1PRNG or DRBG as a non-blocking source of random bytes. The SHA1PRNG algorithm is default in some operating systems that don't have '/dev/random' or '/dev/urandom', e.g., in Windows. The DRBG algorithm is available in JDK9+. To control the algorithm used by this method, use the system property `uuidcreator.securerandom` or the environment variable `UUIDCREATOR_SECURERANDOM` as in examples below. System property: 
         # Use the the algorithm SHA1PRNG for SecureRandom
 -Duuidcreator.securerandom="SHA1PRNG"
 
 # Use the the algorithm DRBG for SecureRandom (JDK9+)
 -Duuidcreator.securerandom="DRBG"
        Environment variable: 
         # Use the the algorithm SHA1PRNG for SecureRandom
 export UUIDCREATOR_SECURERANDOM="SHA1PRNG"
 
 # Use the the algorithm DRBG for SecureRandom (JDK9+)
 export UUIDCREATOR_SECURERANDOM="DRBG"
        Returns:
        a new SecureRandom.