Class: Metafusion::Crypto::PrivateKey

Inherits:
Object
  • Object
show all
Defined in:
lib/metafusion/crypto/base.rb

Overview

Metafusion::Crypto::PrivateKey provides class that wraps the boilerplate private key encryption API from the Ruby standard library OpenSSL implementation.

Usage:

include Metafusion::Crypto
pkey = PrivateKey.new('mypassphrase')
original_text = 'Yo yo yo.  What up dog?'
crypted_text = pkey.encrypt(original_text)
plain_text = pkey.decrypt(crypted_text)
puts "Let's roll and celebrate - it worked" if original_text == plain_text

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(raw_passphrase, cipher = "aes-256-cbc") ⇒ PrivateKey

Creates PrivateKey instance given raw_passphrase and cipher. The default cipher is AES-256-CBC.



110
111
112
113
114
 
# File 'lib/metafusion/crypto/base.rb', line 110

def initialize(raw_passphrase, cipher = "aes-256-cbc")
  @encrypt_cipher = OpenSSL::Cipher::Cipher.new(cipher)
  @decrypt_cipher = OpenSSL::Cipher::Cipher.new(cipher)
  @key = Digest::SHA1.hexdigest(raw_passphrase)
end

Class Method Details

.from_file(key_file = 'rsa_key') ⇒ Object

Read in private key from file



102
103
104
 
# File 'lib/metafusion/crypto/base.rb', line 102

def from_file(key_file = 'rsa_key')
  return self.new(File.read(key_file))
end

Instance Method Details

#decrypt(text) ⇒ Object

Decrypts given text using key instance



125
126
127
128
129
130
 
# File 'lib/metafusion/crypto/base.rb', line 125

def decrypt(text)
  @decrypt_cipher.decrypt(@key)
  s = @decrypt_cipher.update(Base64.decode64(text))
  s << @decrypt_cipher.final
  s
end

#encrypt(text) ⇒ Object

Encrypts given text using key instance



117
118
119
120
121
122
 
# File 'lib/metafusion/crypto/base.rb', line 117

def encrypt(text)
  @encrypt_cipher.encrypt(@key)
  s = @encrypt_cipher.update(text)
  s << @encrypt_cipher.final
  Base64.encode64(s)
end