42 lines
969 B
Ruby
42 lines
969 B
Ruby
# Note: the pbkdf2 gem is bust on 2.0, the logic is so simple I am not sure it makes sense to have this in a gem atm (Sam)
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#
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# Also PBKDF2 monkey patches string ... don't like that at all
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#
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# Happy to move back to PBKDF2 ruby gem provided:
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#
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# 1. It works on Ruby 2.0
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# 2. It works on 1.9.3
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# 3. It does not monkey patch string
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require 'openssl'
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require 'xor'
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class Pbkdf2
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def self.hash_password(password, salt, iterations, algorithm = "sha256")
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h = OpenSSL::Digest.new(algorithm)
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u = ret = prf(h, password, salt + [1].pack("N"))
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2.upto(iterations) do
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u = prf(h, password, u)
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ret.xor!(u)
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end
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ret.bytes.map { |b| ("0" + b.to_s(16))[-2..-1] }.join("")
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end
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protected
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# fallback xor in case we need it for jruby ... way slower
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def self.xor(x, y)
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x.bytes.zip(y.bytes).map { |x, y| x ^ y }.pack('c*')
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end
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def self.prf(hash_function, password, data)
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OpenSSL::HMAC.digest(hash_function, password, data)
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end
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end
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