libgo/go/crypto/dsa/dsa_test.go

   1 // Copyright 2011 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package dsa
   6
   7 import (
   8         "crypto/rand"
   9         "math/big"
  10         "testing"
  11 )
  12
  13 func testSignAndVerify(t *testing.T, i int, priv *PrivateKey) {
  14         hashed := []byte("testing")
  15         r, s, err := Sign(rand.Reader, priv, hashed)
  16         if err != nil {
  17                 t.Errorf("%d: error signing: %s", i, err)
  18                 return
  19         }
  20
  21         if !Verify(&priv.PublicKey, hashed, r, s) {
  22                 t.Errorf("%d: Verify failed", i)
  23         }
  24 }
  25
  26 func testParameterGeneration(t *testing.T, sizes ParameterSizes, L, N int) {
  27         var priv PrivateKey
  28         params := &priv.Parameters
  29
  30         err := GenerateParameters(params, rand.Reader, sizes)
  31         if err != nil {
  32                 t.Errorf("%d: %s", int(sizes), err)
  33                 return
  34         }
  35
  36         if params.P.BitLen() != L {
  37                 t.Errorf("%d: params.BitLen got:%d want:%d", int(sizes), params.P.BitLen(), L)
  38         }
  39
  40         if params.Q.BitLen() != N {
  41                 t.Errorf("%d: q.BitLen got:%d want:%d", int(sizes), params.Q.BitLen(), L)
  42         }
  43
  44         one := new(big.Int)
  45         one.SetInt64(1)
  46         pm1 := new(big.Int).Sub(params.P, one)
  47         quo, rem := new(big.Int).DivMod(pm1, params.Q, new(big.Int))
  48         if rem.Sign() != 0 {
  49                 t.Errorf("%d: p-1 mod q != 0", int(sizes))
  50         }
  51         x := new(big.Int).Exp(params.G, quo, params.P)
  52         if x.Cmp(one) == 0 {
  53                 t.Errorf("%d: invalid generator", int(sizes))
  54         }
  55
  56         err = GenerateKey(&priv, rand.Reader)
  57         if err != nil {
  58                 t.Errorf("error generating key: %s", err)
  59                 return
  60         }
  61
  62         testSignAndVerify(t, int(sizes), &priv)
  63 }
  64
  65 func TestParameterGeneration(t *testing.T) {
  66         if testing.Short() {
  67                 t.Skip("skipping parameter generation test in short mode")
  68         }
  69
  70         testParameterGeneration(t, L1024N160, 1024, 160)
  71         testParameterGeneration(t, L2048N224, 2048, 224)
  72         testParameterGeneration(t, L2048N256, 2048, 256)
  73         testParameterGeneration(t, L3072N256, 3072, 256)
  74 }
  75
  76 func TestSignAndVerify(t *testing.T) {
  77         var priv PrivateKey
  78         priv.P, _ = new(big.Int).SetString("A9B5B793FB4785793D246BAE77E8FF63CA52F442DA763C440259919FE1BC1D6065A9350637A04F75A2F039401D49F08E066C4D275A5A65DA5684BC563C14289D7AB8A67163BFBF79D85972619AD2CFF55AB0EE77A9002B0EF96293BDD0F42685EBB2C66C327079F6C98000FBCB79AACDE1BC6F9D5C7B1A97E3D9D54ED7951FEF", 16)
  79         priv.Q, _ = new(big.Int).SetString("E1D3391245933D68A0714ED34BBCB7A1F422B9C1", 16)
  80         priv.G, _ = new(big.Int).SetString("634364FC25248933D01D1993ECABD0657CC0CB2CEED7ED2E3E8AECDFCDC4A25C3B15E9E3B163ACA2984B5539181F3EFF1A5E8903D71D5B95DA4F27202B77D2C44B430BB53741A8D59A8F86887525C9F2A6A5980A195EAA7F2FF910064301DEF89D3AA213E1FAC7768D89365318E370AF54A112EFBA9246D9158386BA1B4EEFDA", 16)
  81         priv.Y, _ = new(big.Int).SetString("32969E5780CFE1C849A1C276D7AEB4F38A23B591739AA2FE197349AEEBD31366AEE5EB7E6C6DDB7C57D02432B30DB5AA66D9884299FAA72568944E4EEDC92EA3FBC6F39F53412FBCC563208F7C15B737AC8910DBC2D9C9B8C001E72FDC40EB694AB1F06A5A2DBD18D9E36C66F31F566742F11EC0A52E9F7B89355C02FB5D32D2", 16)
  82         priv.X, _ = new(big.Int).SetString("5078D4D29795CBE76D3AACFE48C9AF0BCDBEE91A", 16)
  83
  84         testSignAndVerify(t, 0, &priv)
  85 }