class Decrypt
Public Class Methods
aes_decrypt(data, key, iv)
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# File lib/decrypt.rb, line 11 def self.aes_decrypt(data, key, iv) decipher = OpenSSL::Cipher::AES.new(128, :CBC) decipher.decrypt decipher.key = key decipher.iv = iv begin plain = decipher.update(data) plain << decipher.final rescue OpenSSL::Cipher::CipherError nil end end
base64_decode(base64_encoded_string)
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# File lib/decrypt.rb, line 4 def self.base64_decode(base64_encoded_string) decoded_data = base64_encoded_string.unpack('m')[0] salt = decoded_data[8..15] data = decoded_data[16..decoded_data.length-1] {salt: salt, data: data} end
decrypt_pbkdf2(master_password, data, iterations)
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# File lib/decrypt.rb, line 42 def self.decrypt_pbkdf2(master_password, data, iterations) encrypted = base64_decode(data) key_and_iv = derive_pbkdf2(master_password, encrypted[:salt], iterations) aes_decrypt(encrypted[:data], key_and_iv[:key], key_and_iv[:iv]) end
decrypt_ssl(master_key, validation)
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# File lib/decrypt.rb, line 48 def self.decrypt_ssl(master_key, validation) encrypted = base64_decode(validation) key_and_iv = derive_openssl(master_key, encrypted[:salt]) aes_decrypt(encrypted[:data], key_and_iv[:key], key_and_iv[:iv]) end
derive_openssl(key, content_salt)
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# File lib/decrypt.rb, line 29 def self.derive_openssl(key, content_salt) key = key[0,1024] key_and_iv = "" prev = "" while key_and_iv.length < 32 do prev = Digest::MD5.digest(prev + key + content_salt) key_and_iv << prev end {key: key_and_iv[0,16], iv: key_and_iv[16..-1]} end
derive_pbkdf2(password, salt, iterations)
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# File lib/decrypt.rb, line 24 def self.derive_pbkdf2(password, salt, iterations) key_and_iv = OpenSSL::PKCS5.pbkdf2_hmac_sha1(password, salt, iterations, 32) {key: key_and_iv[0,16], iv: key_and_iv[16..-1]} end