Class: OpenSSL::PKey::EC

Inherits:
Object
  • Object
show all
Defined in:
lib/net/ssh/transport/openssl.rb

Overview

This class is originally defined in the OpenSSL module. As needed, methods have been added to it by the Net::SSH module for convenience in dealing with SSH functionality.

Defined Under Namespace

Classes: Point

Constant Summary collapse

CurveNameAlias = 
{
  'nistp256' => 'prime256v1',
  'nistp384' => 'secp384r1',
  'nistp521' => 'secp521r1'
}.freeze
CurveNameAliasInv = 
{
  'prime256v1' => 'nistp256',
  'secp384r1' => 'nistp384',
  'secp521r1' => 'nistp521'
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.read_keyblob(curve_name_in_type, buffer) ⇒ Object 



144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
 
# File 'lib/net/ssh/transport/openssl.rb', line 144

def self.read_keyblob(curve_name_in_type, buffer)
  curve_name_in_key = buffer.read_string

  unless curve_name_in_type == curve_name_in_key
    raise Net::SSH::Exception, "curve name mismatched (`#{curve_name_in_key}' with `#{curve_name_in_type}')"
  end

  public_key_oct = buffer.read_string
  begin
    key = OpenSSL::PKey::EC.new(OpenSSL::PKey::EC::CurveNameAlias[curve_name_in_key])
    group = key.group
    point = OpenSSL::PKey::EC::Point.new(group, OpenSSL::BN.new(public_key_oct, 2))
    key.public_key = point

    return key
  rescue OpenSSL::PKey::ECError
    raise NotImplementedError, "unsupported key type `#{type}'"
  end
end

Instance Method Details

#ssh_do_sign(data) ⇒ Object

Returns the signature for the given data.



223
224
225
226
227
228
229
230
231
232
 
# File 'lib/net/ssh/transport/openssl.rb', line 223

def ssh_do_sign(data)
  digest = digester.digest(data)
  sig = dsa_sign_asn1(digest)
  a1sig = OpenSSL::ASN1.decode(sig)

  sig_r = a1sig.value[0].value
  sig_s = a1sig.value[1].value

  Net::SSH::Buffer.from(:bignum, sig_r, :bignum, sig_s).to_s
end

#ssh_do_verify(sig, data, options = {}) ⇒ Object

Verifies the given signature matches the given data.



197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
 
# File 'lib/net/ssh/transport/openssl.rb', line 197

def ssh_do_verify(sig, data, options = {})
  digest = digester.digest(data)
  a1sig = nil

  begin
    sig_r_len = sig[0, 4].unpack('H*')[0].to_i(16)
    sig_l_len = sig[4 + sig_r_len, 4].unpack('H*')[0].to_i(16)

    sig_r = sig[4, sig_r_len].unpack('H*')[0]
    sig_s = sig[4 + sig_r_len + 4, sig_l_len].unpack('H*')[0]

    a1sig = OpenSSL::ASN1::Sequence([
                                      OpenSSL::ASN1::Integer(sig_r.to_i(16)),
                                      OpenSSL::ASN1::Integer(sig_s.to_i(16))
                                    ])
  rescue StandardError
  end

  if a1sig.nil?
    return false
  else
    dsa_verify_asn1(digest, a1sig.to_der)
  end
end

#ssh_type ⇒ Object Also known as: ssh_signature_type

Returns the description of this key type used by the SSH2 protocol, like “ecdsa-sha2-nistp256”



166
167
168
 
# File 'lib/net/ssh/transport/openssl.rb', line 166

def ssh_type
  "ecdsa-sha2-#{CurveNameAliasInv[group.curve_name]}"
end

#to_blob ⇒ Object

Converts the key to a blob, according to the SSH2 protocol.



189
190
191
192
193
194
 
# File 'lib/net/ssh/transport/openssl.rb', line 189

def to_blob
  @blob ||= Net::SSH::Buffer.from(:string, ssh_type,
                                  :string, CurveNameAliasInv[group.curve_name],
                                  :mstring, public_key.to_bn.to_s(2)).to_s
  @blob
end