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[rails.git] / lib / password_hash.rb

diff --git a/lib/password_hash.rb b/lib/password_hash.rb
index 5adfc7a34748fa46dd5eed272127d2a3fb179543..de1f20d317afec7e1f2429e30af67ced716fdb2a 100644 (file)
--- a/lib/password_hash.rb
+++ b/lib/password_hash.rb
@@ -1,55 +1,46 @@
-require "securerandom"
-require "openssl"
+require "argon2"
 require "base64"
 require "digest/md5"
+require "openssl"
+require "securerandom"
 
 module PasswordHash
-  SALT_BYTE_SIZE = 32
-  HASH_BYTE_SIZE = 32
-  PBKDF2_ITERATIONS = 1000
-  DIGEST_ALGORITHM = "sha512"
+  FORMAT = Argon2::HashFormat.new(Argon2::Password.create(""))
 
   def self.create(password)
-    salt = SecureRandom.base64(SALT_BYTE_SIZE)
-    hash = self.hash(password, salt, PBKDF2_ITERATIONS, HASH_BYTE_SIZE, DIGEST_ALGORITHM)
-    return hash, [DIGEST_ALGORITHM, PBKDF2_ITERATIONS, salt].join("!")
+    hash = Argon2::Password.create(password)
+    [hash, nil]
   end
 
   def self.check(hash, salt, candidate)
-    if salt.nil?
-      candidate = Digest::MD5.hexdigest(candidate)
-    elsif salt =~ /!/
+    if Argon2::HashFormat.valid_hash?(hash)
+      Argon2::Password.verify_password(candidate, hash)
+    elsif salt.nil?
+      hash == Digest::MD5.hexdigest(candidate)
+    elsif salt.include?("!")
       algorithm, iterations, salt = salt.split("!")
       size = Base64.strict_decode64(hash).length
-      candidate = self.hash(candidate, salt, iterations.to_i, size, algorithm)
+      hash == pbkdf2(candidate, salt, iterations.to_i, size, algorithm)
     else
-      candidate = Digest::MD5.hexdigest(salt + candidate)
+      hash == Digest::MD5.hexdigest(salt + candidate)
     end
-
-    return hash == candidate
   end
 
-  def self.upgrade?(hash, salt)
-    if salt.nil?
-      return true
-    elsif salt =~ /!/
-      algorithm, iterations, salt = salt.split("!")
-      return true if Base64.strict_decode64(salt).length != SALT_BYTE_SIZE
-      return true if Base64.strict_decode64(hash).length != HASH_BYTE_SIZE
-      return true if iterations.to_i != PBKDF2_ITERATIONS
-      return true if algorithm != DIGEST_ALGORITHM
-    else
-      return true
-    end
+  def self.upgrade?(hash, _salt)
+    format = Argon2::HashFormat.new(hash)
 
-    return false
+    format.variant != FORMAT.variant ||
+      format.version != FORMAT.version ||
+      format.t_cost != FORMAT.t_cost ||
+      format.m_cost != FORMAT.m_cost ||
+      format.p_cost != FORMAT.p_cost
+  rescue Argon2::ArgonHashFail
+    true
   end
 
-private
-
-  def self.hash(password, salt, iterations, size, algorithm)
+  def self.pbkdf2(password, salt, iterations, size, algorithm)
     digest = OpenSSL::Digest.new(algorithm)
-    pbkdf2 = OpenSSL::PKCS5::pbkdf2_hmac(password, salt, iterations, size, digest)
+    pbkdf2 = OpenSSL::PKCS5.pbkdf2_hmac(password, salt, iterations, size, digest)
     Base64.strict_encode64(pbkdf2)
   end
 end