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Java implementation of scrypt
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README

Java Implementation of scrypt

  A pure Java implementation of the scrypt key derivation function,
  and JNI bindings for the SSE-optimized C implementation.

  The Java implementation is based in large part on Colin Percival's
  reference implementation contained in
  scrypt-1.1.6/lib/crypto/crypto_scrypt-ref.c, but any errors in this
  port are solely the fault of its author, Will Glozer.

  http://www.tarsnap.com/scrypt/scrypt-1.1.6.tgz
  http://www.tarsnap.com/scrypt/scrypt.pdf

Usage

  com.lambdaworks.crypto.SCryptUtil implements a modified version of MCF,
  the modular crypt format, similar to the one used for storage of Unix
  passwords in the MD5, SHA-256, and bcrypt formats.

    SCryptUtil.scrypt(passwd, N, r, p)
    SCryptUtil.check(passwd, hashed)

  The output of SCryptUtil.scrypt is a string in the modified MCF format:

  $s0$params$salt$key

  s0     - version 0 of the format with 128-bit salt and 256-bit derived key
  params - 32-bit hex integer containing log2(N) (16 bits), r (8 bits), and p (8 bits)
  salt   - base64-encoded salt
  key    - base64-encoded derived key

  Example:

    $s0$e0801$epIxT/h6HbbwHaehFnh/bw==$7H0vsXlY8UxxyW/BWx/9GuY7jEvGjT71GFd6O4SZND0=

    passwd = "secret"
         N = 16384
         r = 8
         p = 1

Maven Artifacts

  Releases containing the pure Java implementation, as well as native libraries
  for a limited number of platforms, are available in the maven central repository.

  <dependency>
    <groupId>com.lambdaworks</groupId>
    <artifactId>scrypt</artifactId>
    <version>1.2.1</version>
  </dependency>

Native Code Implementation

  The native/ directory contains the SSE-optimized C implementation of scrypt
  along with JNI bindings and can be built with the usual autotools
  ./configure && make

  When the native library can be loaded it will be used instead of the pure
  Java implementation.
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