Module: AESCrypt

Defined in:
lib/aescrypt.rb

Class Method Summary collapse

Class Method Details

.decrypt(message, password) ⇒ Object 



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# File 'lib/aescrypt.rb', line 36

def self.decrypt(message, password)
  base64_decoded = Base64.decode64(message.to_s.strip)
  self.decrypt_data(base64_decoded, self.key_digest(password), nil, "AES-256-CBC")
end

.decrypt_data(encrypted_data, key, iv, cipher_type) ⇒ Object

Decrypts a block of data (encrypted_data) given an encryption key and an initialization vector (iv). Keys, iv’s, and the data returned are all binary strings. Cipher_type should be “AES-256-CBC”, “AES-256-ECB”, or any of the cipher types supported by OpenSSL. Pass nil for the iv if the encryption type doesn’t use iv’s (like ECB). :return: => String :arg: encrypted_data => String :arg: key => String :arg: iv => String :arg: cipher_type => String



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# File 'lib/aescrypt.rb', line 56

def self.decrypt_data(encrypted_data, key, iv, cipher_type)
  aes = OpenSSL::Cipher::Cipher.new(cipher_type)
  aes.decrypt
  aes.key = key
  aes.iv = iv if iv != nil
  aes.update(encrypted_data) + aes.final  
end

.encrypt(message, password) ⇒ Object 



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# File 'lib/aescrypt.rb', line 32

def self.encrypt(message, password)
  Base64.encode64(self.encrypt_data(message.to_s.strip, self.key_digest(password), nil, "AES-256-CBC"))
end

.encrypt_data(data, key, iv, cipher_type) ⇒ Object

Encrypts a block of data given an encryption key and an initialization vector (iv). Keys, iv’s, and the data returned are all binary strings. Cipher_type should be “AES-256-CBC”, “AES-256-ECB”, or any of the cipher types supported by OpenSSL.

Pass nil for the iv if the encryption type doesn’t use iv’s (like ECB). :return: => String :arg: data => String :arg: key => String :arg: iv => String :arg: cipher_type => String



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# File 'lib/aescrypt.rb', line 75

def self.encrypt_data(data, key, iv, cipher_type)
  aes = OpenSSL::Cipher::Cipher.new(cipher_type)
  aes.encrypt
  aes.key = key
  aes.iv = iv if iv != nil
  aes.update(data) + aes.final      
end

.key_digest(password) ⇒ Object 



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# File 'lib/aescrypt.rb', line 41

def self.key_digest(password)
  OpenSSL::Digest::SHA256.new(password).digest
end