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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.