CODEWITHSUNDEEP
javahashsha512
user8654216
user8654216

Reputation:

SHA-512 hashing with Java

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;

Upvotes: 10

Views: 15148

Answers (5)

ked
ked

Reputation: 2456

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) }
}

Upvotes: 2

Kevin Davin
Kevin Davin

Reputation: 531

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) 
            }
    }

Upvotes: 0

Tomáš Vyhnálek
Tomáš Vyhnálek

Reputation: 111

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
}

Upvotes: 6

Mauricio Jaramillo
Mauricio Jaramillo

Reputation: 37

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()
}

Upvotes: -2

Oleg
Oleg

Reputation: 6314

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.

Upvotes: 18

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