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Showing content from http://rubydoc.info/github/cryptosphere/rbnacl/RbNaCl/PasswordHash/SCrypt below:

SCrypt – Documentation for cryptosphere/rbnacl (main) – RubyDoc.info

Inherits:

Object

• Object
• RbNaCl::PasswordHash::SCrypt

show all

Extended by:

Sodium

Defined in:

lib/rbnacl/password_hash/scrypt.rb

The scrypt sequential memory hard password hashing function

scrypt is a password hash (or password based KDF). That is to say, where most hash functions are designed to be fast because hashing is often a bottleneck, scrypt is slow by design, because it’s trying to “strengthen” the password by combining it with a random “salt” value then perform a series of operation on the result which are slow enough to defeat brute-force password cracking attempts.

scrypt is similar to the bcrypt and pbkdf2 password hashes in that it’s designed to strengthen passwords, but includes a new design element called “sequential memory hardness” which helps defeat attempts by attackers to compensate for their lack of memory (since they’re typically on GPUs or FPGAs) with additional computation.

• #digest(password, salt) ⇒ String

  Calculate an scrypt digest for a given password and salt.

• #initialize(opslimit, memlimit, digest_size = 64) ⇒ RbNaCl::PasswordHash::SCrypt constructor

  Create a new SCrypt password hash object.

primitive, sodium_constant, sodium_function, sodium_function_with_return_code, sodium_primitive, sodium_type

Create a new SCrypt password hash object

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# File 'lib/rbnacl/password_hash/scrypt.rb', line 39

def initialize(opslimit, memlimit, digest_size = 64)
    @opslimit = opslimit
  @memlimit = memlimit

      
  @digest_size = digest_size
end

Calculate an scrypt digest for a given password and salt

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# File 'lib/rbnacl/password_hash/scrypt.rb', line 57

def digest(password, salt)
  digest = Util.zeros(@digest_size)
  salt   = Util.check_string(salt, SALTBYTES, "salt")

  success = self.class.scrypt(digest, @digest_size, password, password.bytesize, salt, @opslimit, @memlimit)
  raise CryptoError, "scrypt failed!" unless success

  digest
end

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