Module: SecureString::RSAMethods::InstanceMethods

Defined in:
lib/secure_string/rsa_methods.rb

Overview

Adds instance methods for OpenSSL::PKey::RSA support via inclusion of SecureString::RSAMethods to a class.

Instance Method Summary collapse

Instance Method Details

#from_rsa(private_key) ⇒ Object

Given an RSA private key, it decrypts the data string back into the original text.



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# File 'lib/secure_string/rsa_methods.rb', line 51

def from_rsa(private_key)
  key = OpenSSL::PKey::RSA.new(private_key)
  return self.class.new( key.private_decrypt(self) )
end

#sign(private_key, digest_obj = OpenSSL::Digest::SHA256.new) ⇒ Object

Signs the given message using hte given private key.

By default, signs using SHA256, but another digest object can be given.



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# File 'lib/secure_string/rsa_methods.rb', line 59

def sign(private_key, digest_obj=OpenSSL::Digest::SHA256.new)
  digest_obj = (digest_obj.kind_of?(Class) ? digest_obj.new : digest_obj)
  key = OpenSSL::PKey::RSA.new(private_key)
  return self.class.new( key.sign(digest_obj, self) )
end

#to_rsa(public_key) ⇒ Object

Given an RSA public key, it RSA encrypts the data string.

Note that the key must be 11 bytes longer than the data string or it doesn’t work.



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# File 'lib/secure_string/rsa_methods.rb', line 45

def to_rsa(public_key)
  key = OpenSSL::PKey::RSA.new(public_key)
  return self.class.new( key.public_encrypt(self) )
end

#verify?(public_key, signature, digest_obj = OpenSSL::Digest::SHA256.new) ⇒ Boolean

Verifies the given signature matches the messages digest, using the signer’s public key.

By default, verifies using SHA256, but another digest object can be given.

Returns:

  • (Boolean) 


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# File 'lib/secure_string/rsa_methods.rb', line 69

def verify?(public_key, signature, digest_obj=OpenSSL::Digest::SHA256.new)
  digest_obj = (digest_obj.kind_of?(Class) ? digest_obj.new : digest_obj)
  key = OpenSSL::PKey::RSA.new(public_key)
  return key.verify(digest_obj, signature.to_s, self)
end