Add support for other hashing mechanisms

[ketan]

SHA1 as a password hashing mechanism has been deprecated. Industry standard recommendation is bcrypt or PBKDF2.

From this page

What hash algorithm should I use?

DO use:

• Well-designed key stretching algorithms such as PBKDF2, > bcrypt, and scrypt.
• OpenWall's Portable PHP password hashing framework
• My implementations of PBKDF2 in PHP, C#, Java, and Ruby.
• Secure versions of crypt ($2y$, $5$, $6$)

DO NOT use:

• Fast cryptographic hash functions such as MD5, SHA1, SHA256, SHA512, RipeMD, WHIRLPOOL, SHA3, etc.
• Insecure versions of crypt ($1$, $2$, $2x$, $3$).
• Any algorithm that you designed yourself. Only use technology that is in the public domain and has been well-tested by experienced cryptographers.