org.apache.commons.codec.digest

## Class Sha2Crypt

- java.lang.Object
- - org.apache.commons.codec.digest.Sha2Crypt

-     public class Sha2Crypt
      extends Object

  SHA2-based Unix crypt implementation.

  Based on the C implementation released into the Public Domain by Ulrich Drepper <drepper@redhat.com> http://www.akkadia.org/drepper/SHA-crypt.txt

  Conversion to Kotlin and from there to Java in 2012 by Christian Hammers <ch@lathspell.de> and likewise put into the Public Domain.

  This class is immutable and thread-safe.

  Since:
    1.7
  Version:
    $Id: Sha2Crypt.java 1552696 2013-12-20 15:01:34Z ggregory $

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `Sha2Crypt()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static String` | `sha256Crypt(byte[] keyBytes)` Generates a libc crypt() compatible "$5$" hash value with random salt.
    `static String` | `sha256Crypt(byte[] keyBytes, String salt)` Generates a libc6 crypt() compatible "$5$" hash value.
    `static String` | `sha512Crypt(byte[] keyBytes)` Generates a libc crypt() compatible "$6$" hash value with random salt.
    `static String` | `sha512Crypt(byte[] keyBytes, String salt)` Generates a libc6 crypt() compatible "$6$" hash value.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### Sha2Crypt

          public Sha2Crypt()

  - ### Method Detail

    - #### sha256Crypt

          public static String sha256Crypt(byte[] keyBytes)

      Generates a libc crypt() compatible "$5$" hash value with random salt.

      See `Crypt.crypt(String, String)` for details.

      Parameters:
        `keyBytes` - plaintext to hash
      Returns:
        complete hash value
      Throws:
        `RuntimeException` - when a `NoSuchAlgorithmException` is caught.

    - #### sha256Crypt

          public static String sha256Crypt(byte[] keyBytes,
                           String salt)

      Generates a libc6 crypt() compatible "$5$" hash value.

      See `Crypt.crypt(String, String)` for details.

      Parameters:
        `keyBytes` - plaintext to hash
        `salt` - real salt value without prefix or "rounds="
      Returns:
        complete hash value including salt
      Throws:
        `IllegalArgumentException` - if the salt does not match the allowed pattern
        `RuntimeException` - when a `NoSuchAlgorithmException` is caught.

    - #### sha512Crypt

          public static String sha512Crypt(byte[] keyBytes)

      Generates a libc crypt() compatible "$6$" hash value with random salt.

      See `Crypt.crypt(String, String)` for details.

      Parameters:
        `keyBytes` - plaintext to hash
      Returns:
        complete hash value
      Throws:
        `RuntimeException` - when a `NoSuchAlgorithmException` is caught.

    - #### sha512Crypt

          public static String sha512Crypt(byte[] keyBytes,
                           String salt)

      Generates a libc6 crypt() compatible "$6$" hash value.

      See `Crypt.crypt(String, String)` for details.

      Parameters:
        `keyBytes` - plaintext to hash
        `salt` - real salt value without prefix or "rounds="
      Returns:
        complete hash value including salt
      Throws:
        `IllegalArgumentException` - if the salt does not match the allowed pattern
        `RuntimeException` - when a `NoSuchAlgorithmException` is caught.

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