// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package x509

import (
	"asn1"
	"big"
	"crypto/dsa"
	"crypto/rand"
	"crypto/rsa"
	"encoding/hex"
	"encoding/pem"
	"testing"
	"time"
)

func TestParsePKCS1PrivateKey(t *testing.T) {
	block, _ := pem.Decode([]byte(pemPrivateKey))
	priv, err := ParsePKCS1PrivateKey(block.Bytes)
	if err != nil {
		t.Errorf("Failed to parse private key: %s", err)
		return
	}
	if priv.PublicKey.N.Cmp(rsaPrivateKey.PublicKey.N) != 0 ||
		priv.PublicKey.E != rsaPrivateKey.PublicKey.E ||
		priv.D.Cmp(rsaPrivateKey.D) != 0 ||
		priv.Primes[0].Cmp(rsaPrivateKey.Primes[0]) != 0 ||
		priv.Primes[1].Cmp(rsaPrivateKey.Primes[1]) != 0 {
		t.Errorf("got:%+v want:%+v", priv, rsaPrivateKey)
	}
}

var pemPrivateKey = `-----BEGIN RSA PRIVATE KEY-----
MIIBOgIBAAJBALKZD0nEffqM1ACuak0bijtqE2QrI/KLADv7l3kK3ppMyCuLKoF0
fd7Ai2KW5ToIwzFofvJcS/STa6HA5gQenRUCAwEAAQJBAIq9amn00aS0h/CrjXqu
/ThglAXJmZhOMPVn4eiu7/ROixi9sex436MaVeMqSNf7Ex9a8fRNfWss7Sqd9eWu
RTUCIQDasvGASLqmjeffBNLTXV2A5g4t+kLVCpsEIZAycV5GswIhANEPLmax0ME/
EO+ZJ79TJKN5yiGBRsv5yvx5UiHxajEXAiAhAol5N4EUyq6I9w1rYdhPMGpLfk7A
IU2snfRJ6Nq2CQIgFrPsWRCkV+gOYcajD17rEqmuLrdIRexpg8N1DOSXoJ8CIGlS
tAboUGBxTDq3ZroNism3DaMIbKPyYrAqhKov1h5V
-----END RSA PRIVATE KEY-----
`

func bigFromString(s string) *big.Int {
	ret := new(big.Int)
	ret.SetString(s, 10)
	return ret
}

func fromBase10(base10 string) *big.Int {
	i := new(big.Int)
	i.SetString(base10, 10)
	return i
}

func bigFromHexString(s string) *big.Int {
	ret := new(big.Int)
	ret.SetString(s, 16)
	return ret
}

var rsaPrivateKey = &rsa.PrivateKey{
	PublicKey: rsa.PublicKey{
		N: bigFromString("9353930466774385905609975137998169297361893554149986716853295022578535724979677252958524466350471210367835187480748268864277464700638583474144061408845077"),
		E: 65537,
	},
	D: bigFromString("7266398431328116344057699379749222532279343923819063639497049039389899328538543087657733766554155839834519529439851673014800261285757759040931985506583861"),
	Primes: []*big.Int{
		bigFromString("98920366548084643601728869055592650835572950932266967461790948584315647051443"),
		bigFromString("94560208308847015747498523884063394671606671904944666360068158221458669711639"),
	},
}

func TestMarshalRSAPrivateKey(t *testing.T) {
	priv := &rsa.PrivateKey{
		PublicKey: rsa.PublicKey{
			N: fromBase10("16346378922382193400538269749936049106320265317511766357599732575277382844051791096569333808598921852351577762718529818072849191122419410612033592401403764925096136759934497687765453905884149505175426053037420486697072448609022753683683718057795566811401938833367954642951433473337066311978821180526439641496973296037000052546108507805269279414789035461158073156772151892452251106173507240488993608650881929629163465099476849643165682709047462010581308719577053905787496296934240246311806555924593059995202856826239801816771116902778517096212527979497399966526283516447337775509777558018145573127308919204297111496233"),
			E: 3,
		},
		D: fromBase10("10897585948254795600358846499957366070880176878341177571733155050184921896034527397712889205732614568234385175145686545381899460748279607074689061600935843283397424506622998458510302603922766336783617368686090042765718290914099334449154829375179958369993407724946186243249568928237086215759259909861748642124071874879861299389874230489928271621259294894142840428407196932444474088857746123104978617098858619445675532587787023228852383149557470077802718705420275739737958953794088728369933811184572620857678792001136676902250566845618813972833750098806496641114644760255910789397593428910198080271317419213080834885003"),
		Primes: []*big.Int{
			fromBase10("1025363189502892836833747188838978207017355117492483312747347695538428729137306368764177201532277413433182799108299960196606011786562992097313508180436744488171474690412562218914213688661311117337381958560443"),
			fromBase10("3467903426626310123395340254094941045497208049900750380025518552334536945536837294961497712862519984786362199788654739924501424784631315081391467293694361474867825728031147665777546570788493758372218019373"),
			fromBase10("4597024781409332673052708605078359346966325141767460991205742124888960305710298765592730135879076084498363772408626791576005136245060321874472727132746643162385746062759369754202494417496879741537284589047"),
		},
	}

	derBytes := MarshalPKCS1PrivateKey(priv)

	priv2, err := ParsePKCS1PrivateKey(derBytes)
	if err != nil {
		t.Errorf("error parsing serialized key: %s", err)
		return
	}
	if priv.PublicKey.N.Cmp(priv2.PublicKey.N) != 0 ||
		priv.PublicKey.E != priv2.PublicKey.E ||
		priv.D.Cmp(priv2.D) != 0 ||
		len(priv2.Primes) != 3 ||
		priv.Primes[0].Cmp(priv2.Primes[0]) != 0 ||
		priv.Primes[1].Cmp(priv2.Primes[1]) != 0 ||
		priv.Primes[2].Cmp(priv2.Primes[2]) != 0 {
		t.Errorf("got:%+v want:%+v", priv, priv2)
	}
}

type matchHostnamesTest struct {
	pattern, host string
	ok            bool
}

var matchHostnamesTests = []matchHostnamesTest{
	{"a.b.c", "a.b.c", true},
	{"a.b.c", "b.b.c", false},
	{"", "b.b.c", false},
	{"a.b.c", "", false},
	{"example.com", "example.com", true},
	{"example.com", "www.example.com", false},
	{"*.example.com", "www.example.com", true},
	{"*.example.com", "xyz.www.example.com", false},
	{"*.*.example.com", "xyz.www.example.com", true},
	{"*.www.*.com", "xyz.www.example.com", true},
}

func TestMatchHostnames(t *testing.T) {
	for i, test := range matchHostnamesTests {
		r := matchHostnames(test.pattern, test.host)
		if r != test.ok {
			t.Errorf("#%d mismatch got: %t want: %t", i, r, test.ok)
		}
	}
}

func TestCertificateParse(t *testing.T) {
	s, _ := hex.DecodeString(certBytes)
	certs, err := ParseCertificates(s)
	if err != nil {
		t.Error(err)
	}
	if len(certs) != 2 {
		t.Errorf("Wrong number of certs: got %d want 2", len(certs))
		return
	}

	err = certs[0].CheckSignatureFrom(certs[1])
	if err != nil {
		t.Error(err)
	}

	if err := certs[0].VerifyHostname("mail.google.com"); err != nil {
		t.Error(err)
	}
}

var certBytes = "308203223082028ba00302010202106edf0d9499fd4533dd1297fc42a93be1300d06092a864886" +
	"f70d0101050500304c310b3009060355040613025a4131253023060355040a131c546861777465" +
	"20436f6e73756c74696e67202850747929204c74642e311630140603550403130d546861777465" +
	"20534743204341301e170d3039303332353136343932395a170d3130303332353136343932395a" +
	"3069310b3009060355040613025553311330110603550408130a43616c69666f726e6961311630" +
	"140603550407130d4d6f756e7461696e205669657731133011060355040a130a476f6f676c6520" +
	"496e63311830160603550403130f6d61696c2e676f6f676c652e636f6d30819f300d06092a8648" +
	"86f70d010101050003818d0030818902818100c5d6f892fccaf5614b064149e80a2c9581a218ef" +
	"41ec35bd7a58125ae76f9ea54ddc893abbeb029f6b73616bf0ffd868791fba7af9c4aebf3706ba" +
	"3eeaeed27435b4ddcfb157c05f351d66aa87fee0de072d66d773affbd36ab78bef090e0cc861a9" +
	"03ac90dd98b51c9c41566c017f0beec3bff391051ffba0f5cc6850ad2a590203010001a381e730" +
	"81e430280603551d250421301f06082b0601050507030106082b06010505070302060960864801" +
	"86f842040130360603551d1f042f302d302ba029a0278625687474703a2f2f63726c2e74686177" +
	"74652e636f6d2f54686177746553474343412e63726c307206082b060105050701010466306430" +
	"2206082b060105050730018616687474703a2f2f6f6373702e7468617774652e636f6d303e0608" +
	"2b060105050730028632687474703a2f2f7777772e7468617774652e636f6d2f7265706f736974" +
	"6f72792f5468617774655f5347435f43412e637274300c0603551d130101ff04023000300d0609" +
	"2a864886f70d01010505000381810062f1f3050ebc105e497c7aedf87e24d2f4a986bb3b837bd1" +
	"9b91ebcad98b065992f6bd2b49b7d6d3cb2e427a99d606c7b1d46352527fac39e6a8b6726de5bf" +
	"70212a52cba07634a5e332011bd1868e78eb5e3c93cf03072276786f207494feaa0ed9d53b2110" +
	"a76571f90209cdae884385c882587030ee15f33d761e2e45a6bc308203233082028ca003020102" +
	"020430000002300d06092a864886f70d0101050500305f310b3009060355040613025553311730" +
	"15060355040a130e566572695369676e2c20496e632e31373035060355040b132e436c61737320" +
	"33205075626c6963205072696d6172792043657274696669636174696f6e20417574686f726974" +
	"79301e170d3034303531333030303030305a170d3134303531323233353935395a304c310b3009" +
	"060355040613025a4131253023060355040a131c54686177746520436f6e73756c74696e672028" +
	"50747929204c74642e311630140603550403130d5468617774652053474320434130819f300d06" +
	"092a864886f70d010101050003818d0030818902818100d4d367d08d157faecd31fe7d1d91a13f" +
	"0b713cacccc864fb63fc324b0794bd6f80ba2fe10493c033fc093323e90b742b71c403c6d2cde2" +
	"2ff50963cdff48a500bfe0e7f388b72d32de9836e60aad007bc4644a3b847503f270927d0e62f5" +
	"21ab693684317590f8bfc76c881b06957cc9e5a8de75a12c7a68dfd5ca1c875860190203010001" +
	"a381fe3081fb30120603551d130101ff040830060101ff020100300b0603551d0f040403020106" +
	"301106096086480186f842010104040302010630280603551d110421301fa41d301b3119301706" +
	"035504031310507269766174654c6162656c332d313530310603551d1f042a30283026a024a022" +
	"8620687474703a2f2f63726c2e766572697369676e2e636f6d2f706361332e63726c303206082b" +
	"0601050507010104263024302206082b060105050730018616687474703a2f2f6f6373702e7468" +
	"617774652e636f6d30340603551d25042d302b06082b0601050507030106082b06010505070302" +
	"06096086480186f8420401060a6086480186f845010801300d06092a864886f70d010105050003" +
	"81810055ac63eadea1ddd2905f9f0bce76be13518f93d9052bc81b774bad6950a1eededcfddb07" +
	"e9e83994dcab72792f06bfab8170c4a8edea5334edef1e53d906c7562bd15cf4d18a8eb42bb137" +
	"9048084225c53e8acb7feb6f04d16dc574a2f7a27c7b603c77cd0ece48027f012fb69b37e02a2a" +
	"36dcd585d6ace53f546f961e05af"

func TestCreateSelfSignedCertificate(t *testing.T) {
	random := rand.Reader

	block, _ := pem.Decode([]byte(pemPrivateKey))
	priv, err := ParsePKCS1PrivateKey(block.Bytes)
	if err != nil {
		t.Errorf("Failed to parse private key: %s", err)
		return
	}

	template := Certificate{
		SerialNumber: []byte{1},
		Subject: Name{
			CommonName:   "test.example.com",
			Organization: []string{"Acme Co"},
		},
		NotBefore: time.SecondsToUTC(1000),
		NotAfter:  time.SecondsToUTC(100000),

		SubjectKeyId: []byte{1, 2, 3, 4},
		KeyUsage:     KeyUsageCertSign,

		BasicConstraintsValid: true,
		IsCA:                  true,
		DNSNames:              []string{"test.example.com"},

		PolicyIdentifiers:   []asn1.ObjectIdentifier{[]int{1, 2, 3}},
		PermittedDNSDomains: []string{".example.com", "example.com"},
	}

	derBytes, err := CreateCertificate(random, &template, &template, &priv.PublicKey, priv)
	if err != nil {
		t.Errorf("Failed to create certificate: %s", err)
		return
	}

	cert, err := ParseCertificate(derBytes)
	if err != nil {
		t.Errorf("Failed to parse certificate: %s", err)
		return
	}

	if len(cert.PolicyIdentifiers) != 1 || !cert.PolicyIdentifiers[0].Equal(template.PolicyIdentifiers[0]) {
		t.Errorf("Failed to parse policy identifiers: got:%#v want:%#v", cert.PolicyIdentifiers, template.PolicyIdentifiers)
	}

	if len(cert.PermittedDNSDomains) != 2 || cert.PermittedDNSDomains[0] != ".example.com" || cert.PermittedDNSDomains[1] != "example.com" {
		t.Errorf("Failed to parse name constraints: %#v", cert.PermittedDNSDomains)
	}

	err = cert.CheckSignatureFrom(cert)
	if err != nil {
		t.Errorf("Signature verification failed: %s", err)
		return
	}
}

// Self-signed certificate using DSA with SHA1
var dsaCertPem = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`

func TestParseCertificateWithDsaPublicKey(t *testing.T) {
	expectedKey := &dsa.PublicKey{
		Parameters: dsa.Parameters{
			P: bigFromHexString("00BC84B52743B169158BB85974E3E832AF5EFCFC42B264349095313A4A013EEE069A1B937D92E51ACF297A1C77880DF25C8607D8204B4DC45651305EF4A63B40C7D8C42D91EDA397D8F51CBC9D0A531FE2C6F1E55E9357D205C39D395358968CBEDAC11320C607BE16CB9DB492B6E78163305A34DD99CE43C64927D13A0040EB97"),
			Q: bigFromHexString("009A67067F66A323F5D4EC7902C73FE5D9E36FA74F"),
			G: bigFromHexString("009147778295BF5893542BC41BA806898A29E43261DBC85441C37D92E97ED80D323D44825FDDE8374D0FF15877798812682599B216BBCC31B9DCCAD527465FEAFFD7FC2A193612E575E34E7A98AF4D10339FE47390A518CB9975B3160B1D0285D1418D0977C52994F43C29A053E3D685834104C9FAFDC221E38BE9F3989D7A8E42"),
		},
		Y: bigFromHexString("59A27C269FCDE45AA2160A5C980C19211A820095091AB9C5DC8309AB7EC1B3A48C2E267C6D35FEE9B71BCBB92F16AC8E559129347FB5C00BEEDD10BA8915C90698755CA965735A32DC7575BED806E1E38F768FFBC24E41123DC73F1C6E9E4D0C9E692128853AFE29DC665FA993DCA9C903B7BF00B6442B9A76A5DADC6186317A"),
	}
	pemBlock, _ := pem.Decode([]byte(dsaCertPem))
	cert, err := ParseCertificate(pemBlock.Bytes)
	if err != nil {
		t.Fatalf("Failed to parse certificate: %s", err)
	}
	if cert.PublicKeyAlgorithm != DSA {
		t.Errorf("Parsed key algorithm was not DSA")
	}
	parsedKey, ok := cert.PublicKey.(*dsa.PublicKey)
	if !ok {
		t.Fatalf("Parsed key was not a DSA key: %s", err)
	}
	if expectedKey.Y.Cmp(parsedKey.Y) != 0 ||
		expectedKey.P.Cmp(parsedKey.P) != 0 ||
		expectedKey.Q.Cmp(parsedKey.Q) != 0 ||
		expectedKey.G.Cmp(parsedKey.G) != 0 {
		t.Fatal("Parsed key differs from expected key")
	}
}

func TestParseCertificateWithDSASignatureAlgorithm(t *testing.T) {
	pemBlock, _ := pem.Decode([]byte(dsaCertPem))
	cert, err := ParseCertificate(pemBlock.Bytes)
	if err != nil {
		t.Fatalf("Failed to parse certificate: %s", err)
	}
	if cert.SignatureAlgorithm != DSAWithSHA1 {
		t.Errorf("Parsed signature algorithm was not DSAWithSHA1")
	}
}

func TestVerifyCertificateWithDSASignature(t *testing.T) {
	pemBlock, _ := pem.Decode([]byte(dsaCertPem))
	cert, err := ParseCertificate(pemBlock.Bytes)
	if err != nil {
		t.Fatalf("Failed to parse certificate: %s", err)
	}
	// test cert is self-signed
	if err = cert.CheckSignatureFrom(cert); err != nil {
		t.Fatalf("DSA Certificate verfication failed: %s", err)
	}
}