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.

Constant Summary collapse

CurveNameAlias = 
{
  "nistp256" => "prime256v1",
  "nistp384" => "secp384r1",
  "nistp521" => "secp521r1",
}
CurveNameAliasInv = 
{
  "prime256v1" => "nistp256",
  "secp384r1" => "nistp384",
  "secp521r1" => "nistp521",
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.read_keyblob(curve_name_in_type, buffer) ⇒ Object 


143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
 
# File 'lib/net/ssh/transport/openssl.rb', line 143

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.


219
220
221
222
223
224
225
226
227
228
 
# File 'lib/net/ssh/transport/openssl.rb', line 219

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

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

#ssh_do_verify(sig, data) ⇒ Object

Verifies the given signature matches the given data.


193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
 
# File 'lib/net/ssh/transport/openssl.rb', line 193

def ssh_do_verify(sig, data)
  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
  end

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

#ssh_type ⇒ Object

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


164
165
166
 
# File 'lib/net/ssh/transport/openssl.rb', line 164

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

#to_blob ⇒ Object

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


185
186
187
188
189
190
 
# File 'lib/net/ssh/transport/openssl.rb', line 185

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