Class: RSA

Inherits:
Object
  • Object
show all
Defined in:
lib/crypto64.rb

Instance Method Summary collapse

Instance Method Details

#decrypt64(str) ⇒ Object

Decrypt and base64 decode data of arbitrary length.



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# File 'lib/crypto64.rb', line 37

def decrypt64(str)
  dec = ''
  str = Base64.decode64(str)
  while str.length != 0
    dec += self.private_decrypt(str[0..self.decrypt_block_size])
    str = str[self.decrypt_block_size+1..-1] if str.length > self.decrypt_block_size
  end
  dec
end

#decrypt_block_size ⇒ Object

Calculate the block size when decrypting.



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# File 'lib/crypto64.rb', line 19

def decrypt_block_size
  (size/8)-1
end

#encrypt64(str) ⇒ Object

Encrypt and base64 encode data of arbitrary length.



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# File 'lib/crypto64.rb', line 24

def encrypt64(str)
  enc = ''
  while str.length > self.encrypt_block_size
    enc += self.public_encrypt(str[0..self.encrypt_block_size])
    str = str[self.encrypt_block_size+1..-1] if str.length > self.encrypt_block_size
  end
  if str.length != 0 then
    enc += self.public_encrypt(str[0..self.encrypt_block_size])
  end
  Base64.encode64(enc)
end

#encrypt_block_size ⇒ Object

Calculate the block size when encrypting.



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# File 'lib/crypto64.rb', line 14

def encrypt_block_size
  (size/8)-12
end

#size ⇒ Object

Read the length of the private key.



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# File 'lib/crypto64.rb', line 9

def size
  /(\d+ bit)/.match(self.to_text)[0].split(' ')[0].to_i
end