Android Utililty Methods Random Byte Array

List of utility methods to do Random Byte Array

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Description

The list of methods to do Random Byte Array are organized into topic(s).

Method

voidfillRandomBytes(byte[] bytes)
fill Random Bytes 
Random ran = new Random();
for (int i = 0; i < bytes.length; ++i) {
    if (i > 0 && i % 120 == 0) {
        bytes[i] = '\n';
    } else {
        bytes[i] = (byte) (ran.nextInt(10) + 48);
bytegetRandomByte()
get Random Byte 
byte randomNum = 0;
Random random = new Random();
int num = Math.abs(random.nextInt() % 256);
randomNum = (byte) num;
Log.d("", "--> getRandomNum num : " + num + "  ,  randomNum : "
        + (randomNum & 0xFF));
return randomNum;
byte[]getRandomByteArrays(int arrSize)
get Random Byte Arrays 
byte[] byteArr = new byte[arrSize];
for (int i = 0; i < arrSize; i++) {
    byteArr[i] = getRandomByte();
return byteArr;
intrandomInt(int min, int max)
random Int 
Random random = new Random(System.currentTimeMillis());
return min + random.nextInt(max - min);
StringrandomStr(int length)
random Str 
String hash = "";
String charStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
char chars[] = charStr.toCharArray();
int max = chars.length;
Random random = new Random();
for (int i = 0; i < length; i++) {
    hash += chars[Math.abs(random.nextInt()) % max];
return hash;
StringrandomStr(int length)
random Str 
String hash = "";
String charStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
char chars[] = charStr.toCharArray();
int max = chars.length;
Random random = new Random();
for (int i = 0; i < length; i++) {
    hash += chars[Math.abs(random.nextInt()) % max];
return hash;
byte[]generateSalt()
generate Salt 
SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
byte[] salt = new byte[16];
random.nextBytes(salt);
return salt;
byte[]generateSalt()
generate Salt 
byte[] salt = new byte[24];
RANDOM.nextBytes(salt);
return salt;
byte[]getRandomBytes(final int size)
get Random Bytes 
final SecureRandom random = new SecureRandom();
final byte[] bytes = new byte[size];
random.nextBytes(bytes);
return bytes;