Class: Orthrus::SSH::DSAPublicKey

Inherits:
PublicKey show all
Includes:
DSA
Defined in:
lib/orthrus/ssh/dsa.rb

Instance Attribute Summary

Attributes inherited from Key

#comment, #key, #source

Class Method Summary collapse

Instance Method Summary collapse

Methods included from DSA

#initialize, #public_identity, #type

Methods inherited from Key

#==, #dsa?, #fingerprint, #initialize, #inspect, #rsa?

Class Method Details

.parse(data) ⇒ Object 



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
 
# File 'lib/orthrus/ssh/dsa.rb', line 52

def self.parse(data)
  raw = Utils.decode64 data

  b = Buffer.new raw

  type = b.read_string
  unless type == "ssh-dss"
    raise "Unvalid key data"
  end

  k = OpenSSL::PKey::DSA.new
  k.p = b.read_bignum
  k.q = b.read_bignum
  k.g = b.read_bignum
  k.pub_key = b.read_bignum

  new k
end

Instance Method Details

#verify(sig, data) ⇒ Object

Adapted from net-ssh Verifies the given signature matches the given data.



75
76
77
78
79
80
81
82
83
84
85
 
# File 'lib/orthrus/ssh/dsa.rb', line 75

def verify(sig, data)
  sig_r = sig[0,20].unpack("H*")[0].to_i(16)
  sig_s = sig[20,20].unpack("H*")[0].to_i(16)

  a1sig = OpenSSL::ASN1::Sequence([
    OpenSSL::ASN1::Integer(sig_r),
    OpenSSL::ASN1::Integer(sig_s)
  ])

  super a1sig.to_der, data
end