The MD5 Message-Digest Algorithm is a widely used cryptographic hash function that produces a 128-bit (16-byte) hash value. Specified in RFC 1321, MD5 has been employed in a wide variety of security applications, and is also commonly used to check data integrity. MD5 was designed by Ron Rivest in 1991 to replace an earlier hash function, MD4. An MD5 hash is typically expressed as a 32-digit hexadecimal number.

The implementation of MD5 is realized with many programming languages. Here we provide an implementation of MD5 encryption algorithm with Java. The implementation refers to RFC 1321.

Hope this will help those who want to do algorithm research especially in security field.