I was wondering if I can SHA-512 hash a string on Android Studio without a salt.
I've seen other questions, but they all involve the salt, but I want something like this:
TestBox.text = sha512("Hello, world!"); And TextBox will read c1527cd893c124773d811911970c8fe6e857d6df5dc9226bd8a160614c0cd963a4ddea2b94bb7d36021ef9d865d5cea294a82dd49a0bb269f51f6e7a57f79421;
The other questions you saw use salt so just don't use salt like so:
MessageDigest md = MessageDigest.getInstance("SHA-512"); byte[] digest = md.digest("Hello, world!".getBytes()); StringBuilder sb = new StringBuilder(); for (int i = 0; i < digest.length; i++) { sb.append(Integer.toString((digest[i] & 0xff) + 0x100, 16).substring(1)); } System.out.println(sb); Based on this answer.
Keds example is right, but .length will always be biger than 32, (127) so more correct answer should be
private fun getSHA512(input:String):String{ val md: MessageDigest = MessageDigest.getInstance("SHA-512") val messageDigest = md.digest(input.toByteArray()) // Convert byte array into signum representation val no = BigInteger(1, messageDigest) // Convert message digest into hex value var hashtext: String = no.toString(16) // Add preceding 0s to make it 128 chars long while (hashtext.length < 128) { hashtext = "0$hashtext" } // return the HashText return hashtext } method for calculating sha-512 in kotlin
fun getSHA256(input:String):String{ return MessageDigest .getInstance("SHA-256") .digest(input.toByteArray()) .fold("") { str, it -> str + "%02x".format(it) } } 
A more functional solution:
fun sha512(input: String): String { return MessageDigest.getInstance("SHA-512") .digest(input.toByteArray()) .joinToString(separator = "") { ((it.toInt() and 0xff) + 0x100) .toString(16) .substring(1) } } I guess the equivalent in Kotlin is:
fun encriptar(cadena: String): String { var md: MessageDigest = MessageDigest.getInstance("SHA-512") var digest = md.digest(cadena.toByteArray()) var sb: StringBuilder = StringBuilder() var i = 0 while (i < digest.count()) { sb.append(((digest[i] and 0xff.toByte()) + 0x100).toString(16).substring(0, 1)) i++ } return sb.toString() } 