Class: Aes256CbcEncryptor

Inherits:
Object
  • Object
show all
Defined in:
lib/aes_256_cbc_encryptor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hex_secret, hex_iv) ⇒ Aes256CbcEncryptor

Returns a new instance of Aes256CbcEncryptor.

Raises:

  • (ArgumentError) 


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# File 'lib/aes_256_cbc_encryptor.rb', line 4

def initialize(hex_secret, hex_iv)
  @secret = [hex_secret].pack('H*')
  @iv = [hex_iv].pack('H*')
  raise ArgumentError, 'Secret must be 32 bytes.' unless @secret.length == 32
  raise ArgumentError, 'IV must be 16 bytes.' unless @iv.length == 16
end

Instance Attribute Details

#iv ⇒ Object (readonly)

Returns the value of attribute iv.



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# File 'lib/aes_256_cbc_encryptor.rb', line 11

def iv
  @iv
end

#secret ⇒ Object (readonly)

Returns the value of attribute secret.



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# File 'lib/aes_256_cbc_encryptor.rb', line 11

def secret
  @secret
end

Instance Method Details

#cipher(type) ⇒ Object (private) 



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# File 'lib/aes_256_cbc_encryptor.rb', line 35

def cipher(type)
  cipher = OpenSSL::Cipher.new('AES-256-CBC')
  cipher.send(type)
  cipher.key = @secret
  cipher.iv = @iv
  cipher
end

#decrypt(encrypted) ⇒ Object 



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# File 'lib/aes_256_cbc_encryptor.rb', line 19

def decrypt(encrypted)
  cipher = decryption_cipher
  encrypted_data = Base64.urlsafe_decode64(encrypted)
  cipher.update(encrypted_data) + cipher.final
end

#decryption_cipher ⇒ Object (private) 



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# File 'lib/aes_256_cbc_encryptor.rb', line 31

def decryption_cipher
  cipher(:decrypt)
end

#encrypt(payload) ⇒ Object 



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# File 'lib/aes_256_cbc_encryptor.rb', line 13

def encrypt(payload)
  cipher = encryption_cipher
  encrypted = cipher.update(payload) + cipher.final
  Base64.urlsafe_encode64(encrypted)
end

#encryption_cipher ⇒ Object (private) 



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# File 'lib/aes_256_cbc_encryptor.rb', line 27

def encryption_cipher
  cipher(:encrypt)
end