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#pbkdf2_hmac has been renamed to OpenSSL::KDF.pbkdf2_hmac. This method is provided for backwards compatibility.
 
               # File openssl/lib/openssl/pkcs5.rb, line 13
def pbkdf2_hmac(pass, salt, iter, keylen, digest)
  OpenSSL::KDF.pbkdf2_hmac(pass, salt: salt, iterations: iter,
                           length: keylen, hash: digest)
end