Class: HrrRbSsh::Algorithm::Publickey::SshEd25519::PKey

Inherits:
Object
  • Object
show all
Defined in:
lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb

Defined Under Namespace

Classes: Error

Instance Method Summary collapse

Constructor Details

#initialize(arg = nil) ⇒ PKey

Returns a new instance of PKey.



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 16

def initialize arg=nil
  case arg
  when ::Ed25519::SigningKey, ::Ed25519::VerifyKey
    @key = arg
  when ::String
    @key = load_key_str arg
  when nil
    # do nothing
  end
end

Instance Method Details

#key_str ⇒ Object 



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 136

def key_str
  @key.to_bytes
end

#load_key_str(key_str) ⇒ Object 



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 27

def load_key_str key_str
  begin
    load_openssh_key key_str
  rescue
    begin
      load_openssl_key key_str
    rescue
      raise Error
    end
  end
end

#load_openssh_key(key_str) ⇒ Object

Raises:



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 39

def load_openssh_key key_str
  begin_marker = "-----BEGIN OPENSSH PRIVATE KEY-----\n"
  end_marker   = "-----END OPENSSH PRIVATE KEY-----\n"
  magic        = "openssh-key-v1"

  raise Error unless key_str.start_with? begin_marker
  raise Error unless key_str.end_with? end_marker
  decoded_key_str = Base64.decode64(key_str[begin_marker.size...-end_marker.size])
  raise Error unless decoded_key_str[0,14] == magic

  private_key_h = OpenSSHPrivateKey.decode decoded_key_str[15..-1]
  private_key_content_h = OpenSSHPrivateKeyContent.decode private_key_h[:'content']
  key_pair = private_key_content_h[:'key pair']

  ::Ed25519::SigningKey.new(key_pair[0,32])
end

#load_openssl_key(key_str) ⇒ Object 



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 56

def load_openssl_key key_str
  private_key_begin_marker = "-----BEGIN PRIVATE KEY-----\n"
  public_key_begin_marker  = "-----BEGIN PUBLIC KEY-----\n"
  if key_str.start_with? private_key_begin_marker
    begin_marker = "-----BEGIN PRIVATE KEY-----\n"
    end_marker   = "-----END PRIVATE KEY-----\n"

    raise Error unless key_str.start_with? begin_marker
    raise Error unless key_str.end_with? end_marker

    decoded_key_str = Base64.decode64(key_str[begin_marker.size...-end_marker.size])
    key_der = OpenSSL::ASN1.decode decoded_key_str

    ::Ed25519::SigningKey.new(key_der.value[2].value[2..-1])
  elsif key_str.start_with? public_key_begin_marker
    begin_marker = "-----BEGIN PUBLIC KEY-----\n"
    end_marker   = "-----END PUBLIC KEY-----\n"

    raise Error unless key_str.start_with? begin_marker
    raise Error unless key_str.end_with? end_marker

    decoded_key_str = Base64.decode64(key_str[begin_marker.size...-end_marker.size])
    key_der = OpenSSL::ASN1.decode decoded_key_str

    ::Ed25519::VerifyKey.new(key_der.value[1].value)
  else
    raise Error
  end
end

#public_key ⇒ Object 



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 127

def public_key
  case @key
  when ::Ed25519::SigningKey
    self.class.new @key.verify_key
  when ::Ed25519::VerifyKey
    self
  end
end

#set_public_key(key_str) ⇒ Object 



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 86

def set_public_key key_str
  @key = ::Ed25519::VerifyKey.new(key_str)
end

#sign(data) ⇒ Object 



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 140

def sign data
  @key.sign data
end

#to_pem ⇒ Object 



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 90

def to_pem
  ed25519_object_id = '1.3.101.112'
  case @key
=begin
  when ::Ed25519::SigningKey
    begin_marker = "-----BEGIN PRIVATE KEY-----\n"
    end_marker   = "-----END PRIVATE KEY-----\n"
    key_asn1 = OpenSSL::ASN1::Sequence.new(
      [
        OpenSSL::ASN1::Integer.new(OpenSSL::BN.new(0)),
        OpenSSL::ASN1::Sequence.new(
          [
            OpenSSL::ASN1::ObjectId.new(ed25519_object_id),
          ]
        ),
        OpenSSL::ASN1::OctetString.new(@key.to_bytes),
      ]
    )
=end
  when ::Ed25519::VerifyKey
    begin_marker = "-----BEGIN PUBLIC KEY-----\n"
    end_marker   = "-----END PUBLIC KEY-----\n"
    key_asn1 = OpenSSL::ASN1::Sequence.new(
      [
        OpenSSL::ASN1::Sequence.new(
          [
            OpenSSL::ASN1::ObjectId.new(ed25519_object_id),
          ]
        ),
        OpenSSL::ASN1::BitString.new(@key.to_bytes),
      ]
    )
  end
  pem_str = Base64.encode64(key_asn1.to_der)
  begin_marker + pem_str + end_marker
end

#verify(signature, data) ⇒ Object 



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# File 'lib/hrr_rb_ssh/algorithm/publickey/ssh_ed25519/pkey.rb', line 144

def verify signature, data
  begin
    @key.verify signature, data
  rescue ::Ed25519::VerifyError
    false
  end
end