Class: Crypto

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#passphrase ⇒ Object

Returns the value of attribute passphrase.



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# File 'lib/myer/crypto.rb', line 3

def passphrase
  @passphrase
end

Instance Method Details

#call_cmd(cmd, input) ⇒ Object 



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# File 'lib/myer/crypto.rb', line 9

def call_cmd(cmd, input)
  output = nil
  Open3.popen3(cmd) do |stdin, stdout, stderr, wait_thr|
    stdin.puts(input)
    stdin.close
    output = stdout.read

    if !wait_thr.value.success?
      raise Myer::CmdFailed.new(stderr.read)
    end
  end
  output
end

#decrypt(ciphertext) ⇒ Object 



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# File 'lib/myer/crypto.rb', line 32

def decrypt(ciphertext)
  cmd = "gpg --batch --passphrase '#{passphrase}' --decrypt"
  begin
    return call_cmd(cmd, ciphertext).chomp
  rescue Myer::CmdFailed => e
    raise Myer::DecryptionFailed.new("Decryption failed: #{e}")
  end
end

#encrypt(plaintext) ⇒ Object 



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# File 'lib/myer/crypto.rb', line 23

def encrypt(plaintext)
  cmd = "gpg --batch --armor --passphrase '#{passphrase}' --symmetric"
  begin
    return call_cmd(cmd, plaintext)
  rescue Myer::CmdFailed => e
    raise "Encryption failed: #{e}"
  end
end

#generate_passphrase ⇒ Object 



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# File 'lib/myer/crypto.rb', line 5

def generate_passphrase
  `gpg --armor --gen-random 1 16`.chomp
end