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MD5 generator - Calculate MD5 for the typed string.

Level 1:     strtolower  strtoupper     32bit  16bit
Level 2:     strtolower  strtoupper     32bit  16bit

Calculate MD5 result:

MD5 (Message-Digest algorithm 5) is a widely used cryptographic hash function with 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 the integrity of files. However, it has been shown that MD5 is not collision resistant;[3] as such, MD5 is not suitable for applications like SSL certificates or digital signatures that rely on this property. An MD5 hash is typically expressed as a 32-digit hexadecimal number.