// 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 (
	"bytes"
	"crypto/dsa"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"crypto/rsa"
	_ "crypto/sha256"
	_ "crypto/sha512"
	"crypto/x509/pkix"
	"encoding/asn1"
	"encoding/base64"
	"encoding/hex"
	"encoding/pem"
	"fmt"
	"internal/testenv"
	"math/big"
	"net"
	"os/exec"
	"reflect"
	"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)
	}

	// This private key includes an invalid prime that
	// rsa.PrivateKey.Validate should reject.
	data := []byte("0\x16\x02\x00\x02\x02\u007f\x00\x02\x0200\x02\x0200\x02\x02\x00\x01\x02\x02\u007f\x00")
	if _, err := ParsePKCS1PrivateKey(data); err == nil {
		t.Errorf("parsing invalid private key did not result in an error")
	}
}

func TestParsePKIXPublicKey(t *testing.T) {
	block, _ := pem.Decode([]byte(pemPublicKey))
	pub, err := ParsePKIXPublicKey(block.Bytes)
	if err != nil {
		t.Errorf("Failed to parse RSA public key: %s", err)
		return
	}
	rsaPub, ok := pub.(*rsa.PublicKey)
	if !ok {
		t.Errorf("Value returned from ParsePKIXPublicKey was not an RSA public key")
		return
	}

	pubBytes2, err := MarshalPKIXPublicKey(rsaPub)
	if err != nil {
		t.Errorf("Failed to marshal RSA public key for the second time: %s", err)
		return
	}
	if !bytes.Equal(pubBytes2, block.Bytes) {
		t.Errorf("Reserialization of public key didn't match. got %x, want %x", pubBytes2, block.Bytes)
	}
}

var pemPublicKey = `-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3VoPN9PKUjKFLMwOge6+
wnDi8sbETGIx2FKXGgqtAKpzmem53kRGEQg8WeqRmp12wgp74TGpkEXsGae7RS1k
enJCnma4fii+noGH7R0qKgHvPrI2Bwa9hzsH8tHxpyM3qrXslOmD45EH9SxIDUBJ
FehNdaPbLP1gFyahKMsdfxFJLUvbUycuZSJ2ZnIgeVxwm4qbSvZInL9Iu4FzuPtg
fINKcbbovy1qq4KvPIrXzhbY3PWDc6btxCf3SE0JdE1MCPThntB62/bLMSQ7xdDR
FF53oIpvxe/SCOymfWq/LW849Ytv3Xwod0+wzAP8STXG4HSELS4UedPYeHJJJYcZ
+QIDAQAB
-----END PUBLIC KEY-----
`

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", "example.com", false},
	{"*.example.com", "www.example.com", true},
	{"*.example.com", "www.example.com.", true},
	{"*.example.com", "xyz.www.example.com", false},
	{"*.*.example.com", "xyz.www.example.com", false},
	{"*.www.*.com", "xyz.www.example.com", false},
	{"*bar.example.com", "foobar.example.com", false},
	{"f*.example.com", "foobar.example.com", false},
	{"", ".", false},
	{".", "", false},
	{".", ".", false},
	{"example.com", "example.com.", true},
	{"example.com.", "example.com", true},
	{"example.com.", "example.com.", true},
	{"*.com.", "example.com.", true},
	{"*.com.", "example.com", true},
	{"*.com", "example.com", true},
	{"*.com", "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 when matching '%s' against '%s'", i, r, test.ok, test.host, test.pattern)
		}
	}
}

func TestMatchIP(t *testing.T) {
	// Check that pattern matching is working.
	c := &Certificate{
		DNSNames: []string{"*.foo.bar.baz"},
		Subject: pkix.Name{
			CommonName: "*.foo.bar.baz",
		},
	}
	err := c.VerifyHostname("quux.foo.bar.baz")
	if err != nil {
		t.Fatalf("VerifyHostname(quux.foo.bar.baz): %v", err)
	}

	// But check that if we change it to be matching against an IP address,
	// it is rejected.
	c = &Certificate{
		DNSNames: []string{"*.2.3.4"},
		Subject: pkix.Name{
			CommonName: "*.2.3.4",
		},
	}
	err = c.VerifyHostname("1.2.3.4")
	if err == nil {
		t.Fatalf("VerifyHostname(1.2.3.4) should have failed, did not")
	}

	c = &Certificate{
		IPAddresses: []net.IP{net.ParseIP("127.0.0.1"), net.ParseIP("::1")},
	}
	err = c.VerifyHostname("127.0.0.1")
	if err != nil {
		t.Fatalf("VerifyHostname(127.0.0.1): %v", err)
	}
	err = c.VerifyHostname("::1")
	if err != nil {
		t.Fatalf("VerifyHostname(::1): %v", err)
	}
	err = c.VerifyHostname("[::1]")
	if err != nil {
		t.Fatalf("VerifyHostname([::1]): %v", err)
	}
}

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)
	}

	const expectedExtensions = 4
	if n := len(certs[0].Extensions); n != expectedExtensions {
		t.Errorf("want %d extensions, got %d", expectedExtensions, n)
	}
}

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))
	rsaPriv, err := ParsePKCS1PrivateKey(block.Bytes)
	if err != nil {
		t.Fatalf("Failed to parse private key: %s", err)
	}

	ecdsaPriv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		t.Fatalf("Failed to generate ECDSA key: %s", err)
	}

	tests := []struct {
		name      string
		pub, priv interface{}
		checkSig  bool
		sigAlgo   SignatureAlgorithm
	}{
		{"RSA/RSA", &rsaPriv.PublicKey, rsaPriv, true, SHA1WithRSA},
		{"RSA/ECDSA", &rsaPriv.PublicKey, ecdsaPriv, false, ECDSAWithSHA384},
		{"ECDSA/RSA", &ecdsaPriv.PublicKey, rsaPriv, false, SHA256WithRSA},
		{"ECDSA/ECDSA", &ecdsaPriv.PublicKey, ecdsaPriv, true, ECDSAWithSHA1},
	}

	testExtKeyUsage := []ExtKeyUsage{ExtKeyUsageClientAuth, ExtKeyUsageServerAuth}
	testUnknownExtKeyUsage := []asn1.ObjectIdentifier{[]int{1, 2, 3}, []int{2, 59, 1}}
	extraExtensionData := []byte("extra extension")

	for _, test := range tests {
		commonName := "test.example.com"
		template := Certificate{
			// SerialNumber is negative to ensure that negative
			// values are parsed. This is due to the prevalence of
			// buggy code that produces certificates with negative
			// serial numbers.
			SerialNumber: big.NewInt(-1),
			Subject: pkix.Name{
				CommonName:   commonName,
				Organization: []string{"Σ Acme Co"},
				Country:      []string{"US"},
				ExtraNames: []pkix.AttributeTypeAndValue{
					{
						Type:  []int{2, 5, 4, 42},
						Value: "Gopher",
					},
					// This should override the Country, above.
					{
						Type:  []int{2, 5, 4, 6},
						Value: "NL",
					},
				},
			},
			NotBefore: time.Unix(1000, 0),
			NotAfter:  time.Unix(100000, 0),

			SignatureAlgorithm: test.sigAlgo,

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

			ExtKeyUsage:        testExtKeyUsage,
			UnknownExtKeyUsage: testUnknownExtKeyUsage,

			BasicConstraintsValid: true,
			IsCA: true,

			OCSPServer:            []string{"http://ocsp.example.com"},
			IssuingCertificateURL: []string{"http://crt.example.com/ca1.crt"},

			DNSNames:       []string{"test.example.com"},
			EmailAddresses: []string{"gopher@golang.org"},
			IPAddresses:    []net.IP{net.IPv4(127, 0, 0, 1).To4(), net.ParseIP("2001:4860:0:2001::68")},

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

			CRLDistributionPoints: []string{"http://crl1.example.com/ca1.crl", "http://crl2.example.com/ca1.crl"},

			ExtraExtensions: []pkix.Extension{
				{
					Id:    []int{1, 2, 3, 4},
					Value: extraExtensionData,
				},
				// This extension should override the SubjectKeyId, above.
				{
					Id:       oidExtensionSubjectKeyId,
					Critical: false,
					Value:    []byte{0x04, 0x04, 4, 3, 2, 1},
				},
			},
		}

		derBytes, err := CreateCertificate(random, &template, &template, test.pub, test.priv)
		if err != nil {
			t.Errorf("%s: failed to create certificate: %s", test.name, err)
			continue
		}

		cert, err := ParseCertificate(derBytes)
		if err != nil {
			t.Errorf("%s: failed to parse certificate: %s", test.name, err)
			continue
		}

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

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

		if cert.Subject.CommonName != commonName {
			t.Errorf("%s: subject wasn't correctly copied from the template. Got %s, want %s", test.name, cert.Subject.CommonName, commonName)
		}

		if len(cert.Subject.Country) != 1 || cert.Subject.Country[0] != "NL" {
			t.Errorf("%s: ExtraNames didn't override Country", test.name)
		}

		found := false
		for _, atv := range cert.Subject.Names {
			if atv.Type.Equal([]int{2, 5, 4, 42}) {
				found = true
				break
			}
		}
		if !found {
			t.Errorf("%s: Names didn't contain oid 2.5.4.42 from ExtraNames", test.name)
		}

		if cert.Issuer.CommonName != commonName {
			t.Errorf("%s: issuer wasn't correctly copied from the template. Got %s, want %s", test.name, cert.Issuer.CommonName, commonName)
		}

		if cert.SignatureAlgorithm != test.sigAlgo {
			t.Errorf("%s: SignatureAlgorithm wasn't copied from template. Got %v, want %v", test.name, cert.SignatureAlgorithm, test.sigAlgo)
		}

		if !reflect.DeepEqual(cert.ExtKeyUsage, testExtKeyUsage) {
			t.Errorf("%s: extkeyusage wasn't correctly copied from the template. Got %v, want %v", test.name, cert.ExtKeyUsage, testExtKeyUsage)
		}

		if !reflect.DeepEqual(cert.UnknownExtKeyUsage, testUnknownExtKeyUsage) {
			t.Errorf("%s: unknown extkeyusage wasn't correctly copied from the template. Got %v, want %v", test.name, cert.UnknownExtKeyUsage, testUnknownExtKeyUsage)
		}

		if !reflect.DeepEqual(cert.OCSPServer, template.OCSPServer) {
			t.Errorf("%s: OCSP servers differ from template. Got %v, want %v", test.name, cert.OCSPServer, template.OCSPServer)
		}

		if !reflect.DeepEqual(cert.IssuingCertificateURL, template.IssuingCertificateURL) {
			t.Errorf("%s: Issuing certificate URLs differ from template. Got %v, want %v", test.name, cert.IssuingCertificateURL, template.IssuingCertificateURL)
		}

		if !reflect.DeepEqual(cert.DNSNames, template.DNSNames) {
			t.Errorf("%s: SAN DNS names differ from template. Got %v, want %v", test.name, cert.DNSNames, template.DNSNames)
		}

		if !reflect.DeepEqual(cert.EmailAddresses, template.EmailAddresses) {
			t.Errorf("%s: SAN emails differ from template. Got %v, want %v", test.name, cert.EmailAddresses, template.EmailAddresses)
		}

		if !reflect.DeepEqual(cert.IPAddresses, template.IPAddresses) {
			t.Errorf("%s: SAN IPs differ from template. Got %v, want %v", test.name, cert.IPAddresses, template.IPAddresses)
		}

		if !reflect.DeepEqual(cert.CRLDistributionPoints, template.CRLDistributionPoints) {
			t.Errorf("%s: CRL distribution points differ from template. Got %v, want %v", test.name, cert.CRLDistributionPoints, template.CRLDistributionPoints)
		}

		if !bytes.Equal(cert.SubjectKeyId, []byte{4, 3, 2, 1}) {
			t.Errorf("%s: ExtraExtensions didn't override SubjectKeyId", test.name)
		}

		if !bytes.Contains(derBytes, extraExtensionData) {
			t.Errorf("%s: didn't find extra extension in DER output", test.name)
		}

		if test.checkSig {
			err = cert.CheckSignatureFrom(cert)
			if err != nil {
				t.Errorf("%s: signature verification failed: %s", test.name, err)
			}
		}
	}
}

func TestUnknownCriticalExtension(t *testing.T) {
	priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		t.Fatalf("Failed to generate ECDSA key: %s", err)
	}

	oids := []asn1.ObjectIdentifier{
		// This OID is in the PKIX arc, but unknown.
		{2, 5, 29, 999999},
		// This is a nonsense, unassigned OID.
		{1, 2, 3, 4},
	}

	for _, oid := range oids {
		template := Certificate{
			SerialNumber: big.NewInt(1),
			Subject: pkix.Name{
				CommonName: "foo",
			},
			NotBefore: time.Unix(1000, 0),
			NotAfter:  time.Now().AddDate(1, 0, 0),

			BasicConstraintsValid: true,
			IsCA: true,

			KeyUsage:    KeyUsageCertSign,
			ExtKeyUsage: []ExtKeyUsage{ExtKeyUsageServerAuth},

			ExtraExtensions: []pkix.Extension{
				{
					Id:       oid,
					Critical: true,
					Value:    nil,
				},
			},
		}

		derBytes, err := CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
		if err != nil {
			t.Fatalf("failed to create certificate: %s", err)
		}

		cert, err := ParseCertificate(derBytes)
		if err != nil {
			t.Fatalf("Certificate with unknown critical extension was not parsed: %s", err)
		}

		roots := NewCertPool()
		roots.AddCert(cert)

		// Setting Roots ensures that Verify won't delegate to the OS
		// library and thus the correct error should always be
		// returned.
		_, err = cert.Verify(VerifyOptions{Roots: roots})
		if err == nil {
			t.Fatal("Certificate with unknown critical extension was verified without error")
		}
		if _, ok := err.(UnhandledCriticalExtension); !ok {
			t.Fatalf("Error was %#v, but wanted one of type UnhandledCriticalExtension", err)
		}

		cert.UnhandledCriticalExtensions = nil
		if _, err = cert.Verify(VerifyOptions{Roots: roots}); err != nil {
			t.Errorf("Certificate failed to verify after unhandled critical extensions were cleared: %s", err)
		}
	}
}

// Self-signed certificate using ECDSA with SHA1 & secp256r1
var ecdsaSHA1CertPem = `
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`

// Self-signed certificate using ECDSA with SHA256 & secp256r1
var ecdsaSHA256p256CertPem = `
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`

// Self-signed certificate using ECDSA with SHA256 & secp384r1
var ecdsaSHA256p384CertPem = `
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`

// Self-signed certificate using ECDSA with SHA384 & secp521r1
var ecdsaSHA384p521CertPem = `
-----BEGIN CERTIFICATE-----
MIICljCCAfcCCQDhp1AFD/ahKjAKBggqhkjOPQQDAzCBjjELMAkGA1UEBhMCVVMx
EzARBgNVBAgMCkNhbGlmb3JuaWExFjAUBgNVBAcMDU1vdW50YWluIFZpZXcxFDAS
BgNVBAoMC0dvb2dsZSwgSW5jMRcwFQYDVQQDDA53d3cuZ29vZ2xlLmNvbTEjMCEG
CSqGSIb3DQEJARYUZ29sYW5nLWRldkBnbWFpbC5jb20wHhcNMTIwNTIxMTUwNDI5
WhcNMjIwNTE5MTUwNDI5WjCBjjELMAkGA1UEBhMCVVMxEzARBgNVBAgMCkNhbGlm
b3JuaWExFjAUBgNVBAcMDU1vdW50YWluIFZpZXcxFDASBgNVBAoMC0dvb2dsZSwg
SW5jMRcwFQYDVQQDDA53d3cuZ29vZ2xlLmNvbTEjMCEGCSqGSIb3DQEJARYUZ29s
YW5nLWRldkBnbWFpbC5jb20wgZswEAYHKoZIzj0CAQYFK4EEACMDgYYABACqx9Rv
IssRs1LWYcNN+WffwlHw4Tv3y8/LIAA9MF1ZScIonU9nRMxt4a2uGJVCPDw6JHpz
PaYc0E9puLoE9AfKpwFr59Jkot7dBg55SKPEFkddoip/rvmN7NPAWjMBirOwjOkm
8FPthvPhGPqsu9AvgVuHu3PosWiHGNrhh379pva8MzAKBggqhkjOPQQDAwOBjAAw
gYgCQgEHNmswkUdPpHqrVxp9PvLVl+xxPuHBkT+75z9JizyxtqykHQo9Uh6SWCYH
BF9KLolo01wMt8DjoYP5Fb3j5MH7xwJCAbWZzTOp4l4DPkIvAh4LeC4VWbwPPyqh
kBg71w/iEcSY3wUKgHGcJJrObZw7wys91I5kENljqw/Samdr3ka+jBJa
-----END CERTIFICATE-----
`

var ecdsaTests = []struct {
	sigAlgo SignatureAlgorithm
	pemCert string
}{
	{ECDSAWithSHA1, ecdsaSHA1CertPem},
	{ECDSAWithSHA256, ecdsaSHA256p256CertPem},
	{ECDSAWithSHA256, ecdsaSHA256p384CertPem},
	{ECDSAWithSHA384, ecdsaSHA384p521CertPem},
}

func TestECDSA(t *testing.T) {
	for i, test := range ecdsaTests {
		pemBlock, _ := pem.Decode([]byte(test.pemCert))
		cert, err := ParseCertificate(pemBlock.Bytes)
		if err != nil {
			t.Errorf("%d: failed to parse certificate: %s", i, err)
			continue
		}
		if sa := cert.SignatureAlgorithm; sa != test.sigAlgo {
			t.Errorf("%d: signature algorithm is %v, want %v", i, sa, test.sigAlgo)
		}
		if parsedKey, ok := cert.PublicKey.(*ecdsa.PublicKey); !ok {
			t.Errorf("%d: wanted an ECDSA public key but found: %#v", i, parsedKey)
		}
		if pka := cert.PublicKeyAlgorithm; pka != ECDSA {
			t.Errorf("%d: public key algorithm is %v, want ECDSA", i, pka)
		}
		if err = cert.CheckSignatureFrom(cert); err != nil {
			t.Errorf("%d: certificate verification failed: %s", i, err)
		}
	}
}

// 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 verification failed: %s", err)
	}
}

const pemCertificate = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`

func TestCRLCreation(t *testing.T) {
	block, _ := pem.Decode([]byte(pemPrivateKey))
	priv, _ := ParsePKCS1PrivateKey(block.Bytes)
	block, _ = pem.Decode([]byte(pemCertificate))
	cert, _ := ParseCertificate(block.Bytes)

	now := time.Unix(1000, 0)
	expiry := time.Unix(10000, 0)

	revokedCerts := []pkix.RevokedCertificate{
		{
			SerialNumber:   big.NewInt(1),
			RevocationTime: now,
		},
		{
			SerialNumber:   big.NewInt(42),
			RevocationTime: now,
		},
	}

	crlBytes, err := cert.CreateCRL(rand.Reader, priv, revokedCerts, now, expiry)
	if err != nil {
		t.Errorf("error creating CRL: %s", err)
	}

	_, err = ParseDERCRL(crlBytes)
	if err != nil {
		t.Errorf("error reparsing CRL: %s", err)
	}
}

func fromBase64(in string) []byte {
	out := make([]byte, base64.StdEncoding.DecodedLen(len(in)))
	n, err := base64.StdEncoding.Decode(out, []byte(in))
	if err != nil {
		panic("failed to base64 decode")
	}
	return out[:n]
}

func TestParseDERCRL(t *testing.T) {
	derBytes := fromBase64(derCRLBase64)
	certList, err := ParseDERCRL(derBytes)
	if err != nil {
		t.Errorf("error parsing: %s", err)
		return
	}
	numCerts := len(certList.TBSCertList.RevokedCertificates)
	expected := 88
	if numCerts != expected {
		t.Errorf("bad number of revoked certificates. got: %d want: %d", numCerts, expected)
	}

	if certList.HasExpired(time.Unix(1302517272, 0)) {
		t.Errorf("CRL has expired (but shouldn't have)")
	}

	// Can't check the signature here without a package cycle.
}

func TestCRLWithoutExpiry(t *testing.T) {
	derBytes := fromBase64("MIHYMIGZMAkGByqGSM44BAMwEjEQMA4GA1UEAxMHQ2FybERTUxcNOTkwODI3MDcwMDAwWjBpMBMCAgDIFw05OTA4MjIwNzAwMDBaMBMCAgDJFw05OTA4MjIwNzAwMDBaMBMCAgDTFw05OTA4MjIwNzAwMDBaMBMCAgDSFw05OTA4MjIwNzAwMDBaMBMCAgDUFw05OTA4MjQwNzAwMDBaMAkGByqGSM44BAMDLwAwLAIUfmVSdjP+NHMX0feW+aDU2G1cfT0CFAJ6W7fVWxjBz4fvftok8yqDnDWh")
	certList, err := ParseDERCRL(derBytes)
	if err != nil {
		t.Fatal(err)
	}
	if !certList.TBSCertList.NextUpdate.IsZero() {
		t.Errorf("NextUpdate is not the zero value")
	}
}

func TestParsePEMCRL(t *testing.T) {
	pemBytes := fromBase64(pemCRLBase64)
	certList, err := ParseCRL(pemBytes)
	if err != nil {
		t.Errorf("error parsing: %s", err)
		return
	}
	numCerts := len(certList.TBSCertList.RevokedCertificates)
	expected := 2
	if numCerts != expected {
		t.Errorf("bad number of revoked certificates. got: %d want: %d", numCerts, expected)
	}

	if certList.HasExpired(time.Unix(1302517272, 0)) {
		t.Errorf("CRL has expired (but shouldn't have)")
	}

	// Can't check the signature here without a package cycle.
}

func TestImports(t *testing.T) {
	testenv.MustHaveGoRun(t)

	if err := exec.Command("go", "run", "x509_test_import.go").Run(); err != nil {
		t.Errorf("failed to run x509_test_import.go: %s", err)
	}
}

const derCRLBase64 = "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"

const pemCRLBase64 = "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"

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

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

	ecdsa256Priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		t.Fatalf("Failed to generate ECDSA key: %s", err)
	}

	ecdsa384Priv, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
	if err != nil {
		t.Fatalf("Failed to generate ECDSA key: %s", err)
	}

	ecdsa521Priv, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
	if err != nil {
		t.Fatalf("Failed to generate ECDSA key: %s", err)
	}

	tests := []struct {
		name    string
		priv    interface{}
		sigAlgo SignatureAlgorithm
	}{
		{"RSA", rsaPriv, SHA1WithRSA},
		{"ECDSA-256", ecdsa256Priv, ECDSAWithSHA1},
		{"ECDSA-384", ecdsa384Priv, ECDSAWithSHA1},
		{"ECDSA-521", ecdsa521Priv, ECDSAWithSHA1},
	}

	for _, test := range tests {
		template := CertificateRequest{
			Subject: pkix.Name{
				CommonName:   "test.example.com",
				Organization: []string{"Σ Acme Co"},
			},
			SignatureAlgorithm: test.sigAlgo,
			DNSNames:           []string{"test.example.com"},
			EmailAddresses:     []string{"gopher@golang.org"},
			IPAddresses:        []net.IP{net.IPv4(127, 0, 0, 1).To4(), net.ParseIP("2001:4860:0:2001::68")},
		}

		derBytes, err := CreateCertificateRequest(random, &template, test.priv)
		if err != nil {
			t.Errorf("%s: failed to create certificate request: %s", test.name, err)
			continue
		}

		out, err := ParseCertificateRequest(derBytes)
		if err != nil {
			t.Errorf("%s: failed to create certificate request: %s", test.name, err)
			continue
		}

		err = out.CheckSignature()
		if err != nil {
			t.Errorf("%s: failed to check certificate request signature: %s", test.name, err)
			continue
		}

		if out.Subject.CommonName != template.Subject.CommonName {
			t.Errorf("%s: output subject common name and template subject common name don't match", test.name)
		} else if len(out.Subject.Organization) != len(template.Subject.Organization) {
			t.Errorf("%s: output subject organisation and template subject organisation don't match", test.name)
		} else if len(out.DNSNames) != len(template.DNSNames) {
			t.Errorf("%s: output DNS names and template DNS names don't match", test.name)
		} else if len(out.EmailAddresses) != len(template.EmailAddresses) {
			t.Errorf("%s: output email addresses and template email addresses don't match", test.name)
		} else if len(out.IPAddresses) != len(template.IPAddresses) {
			t.Errorf("%s: output IP addresses and template IP addresses names don't match", test.name)
		}
	}
}

func marshalAndParseCSR(t *testing.T, template *CertificateRequest) *CertificateRequest {
	block, _ := pem.Decode([]byte(pemPrivateKey))
	rsaPriv, err := ParsePKCS1PrivateKey(block.Bytes)
	if err != nil {
		t.Fatal(err)
	}

	derBytes, err := CreateCertificateRequest(rand.Reader, template, rsaPriv)
	if err != nil {
		t.Fatal(err)
	}

	csr, err := ParseCertificateRequest(derBytes)
	if err != nil {
		t.Fatal(err)
	}

	return csr
}

func TestCertificateRequestOverrides(t *testing.T) {
	sanContents, err := marshalSANs([]string{"foo.example.com"}, nil, nil)
	if err != nil {
		t.Fatal(err)
	}

	template := CertificateRequest{
		Subject: pkix.Name{
			CommonName:   "test.example.com",
			Organization: []string{"Σ Acme Co"},
		},
		DNSNames: []string{"test.example.com"},

		// An explicit extension should override the DNSNames from the
		// template.
		ExtraExtensions: []pkix.Extension{
			{
				Id:    oidExtensionSubjectAltName,
				Value: sanContents,
			},
		},
	}

	csr := marshalAndParseCSR(t, &template)

	if len(csr.DNSNames) != 1 || csr.DNSNames[0] != "foo.example.com" {
		t.Errorf("Extension did not override template. Got %v\n", csr.DNSNames)
	}

	// If there is already an attribute with X.509 extensions then the
	// extra extensions should be added to it rather than creating a CSR
	// with two extension attributes.

	template.Attributes = []pkix.AttributeTypeAndValueSET{
		{
			Type: oidExtensionRequest,
			Value: [][]pkix.AttributeTypeAndValue{
				{
					{
						Type:  oidExtensionAuthorityInfoAccess,
						Value: []byte("foo"),
					},
				},
			},
		},
	}

	csr = marshalAndParseCSR(t, &template)
	if l := len(csr.Attributes); l != 1 {
		t.Errorf("incorrect number of attributes: %d\n", l)
	}

	if !csr.Attributes[0].Type.Equal(oidExtensionRequest) ||
		len(csr.Attributes[0].Value) != 1 ||
		len(csr.Attributes[0].Value[0]) != 2 {
		t.Errorf("bad attributes: %#v\n", csr.Attributes)
	}

	sanContents2, err := marshalSANs([]string{"foo2.example.com"}, nil, nil)
	if err != nil {
		t.Fatal(err)
	}

	// Extensions in Attributes should override those in ExtraExtensions.
	template.Attributes[0].Value[0] = append(template.Attributes[0].Value[0], pkix.AttributeTypeAndValue{
		Type:  oidExtensionSubjectAltName,
		Value: sanContents2,
	})

	csr = marshalAndParseCSR(t, &template)

	if len(csr.DNSNames) != 1 || csr.DNSNames[0] != "foo2.example.com" {
		t.Errorf("Attributes did not override ExtraExtensions. Got %v\n", csr.DNSNames)
	}
}

func TestParseCertificateRequest(t *testing.T) {
	for _, csrBase64 := range csrBase64Array {
		csrBytes := fromBase64(csrBase64)
		csr, err := ParseCertificateRequest(csrBytes)
		if err != nil {
			t.Fatalf("failed to parse CSR: %s", err)
		}

		if len(csr.EmailAddresses) != 1 || csr.EmailAddresses[0] != "gopher@golang.org" {
			t.Errorf("incorrect email addresses found: %v", csr.EmailAddresses)
		}

		if len(csr.DNSNames) != 1 || csr.DNSNames[0] != "test.example.com" {
			t.Errorf("incorrect DNS names found: %v", csr.DNSNames)
		}

		if len(csr.Subject.Country) != 1 || csr.Subject.Country[0] != "AU" {
			t.Errorf("incorrect Subject name: %v", csr.Subject)
		}

		found := false
		for _, e := range csr.Extensions {
			if e.Id.Equal(oidExtensionBasicConstraints) {
				found = true
				break
			}
		}
		if !found {
			t.Errorf("basic constraints extension not found in CSR")
		}
	}
}

func TestCriticalFlagInCSRRequestedExtensions(t *testing.T) {
	// This CSR contains an extension request where the extensions have a
	// critical flag in them. In the past we failed to handle this.
	const csrBase64 = "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"

	csrBytes := fromBase64(csrBase64)
	csr, err := ParseCertificateRequest(csrBytes)
	if err != nil {
		t.Fatalf("failed to parse CSR: %s", err)
	}

	expected := []struct {
		Id    asn1.ObjectIdentifier
		Value []byte
	}{
		{oidExtensionBasicConstraints, fromBase64("MAYBAf8CAQA=")},
		{oidExtensionKeyUsage, fromBase64("AwIChA==")},
	}

	if n := len(csr.Extensions); n != len(expected) {
		t.Fatalf("expected to find %d extensions but found %d", len(expected), n)
	}

	for i, extension := range csr.Extensions {
		if !extension.Id.Equal(expected[i].Id) {
			t.Fatalf("extension #%d has unexpected type %v (expected %v)", i, extension.Id, expected[i].Id)
		}

		if !bytes.Equal(extension.Value, expected[i].Value) {
			t.Fatalf("extension #%d has unexpected contents %x (expected %x)", i, extension.Value, expected[i].Value)
		}
	}
}

func TestMaxPathLen(t *testing.T) {
	block, _ := pem.Decode([]byte(pemPrivateKey))
	rsaPriv, err := ParsePKCS1PrivateKey(block.Bytes)
	if err != nil {
		t.Fatalf("Failed to parse private key: %s", err)
	}

	template := &Certificate{
		SerialNumber: big.NewInt(1),
		Subject: pkix.Name{
			CommonName: "Σ Acme Co",
		},
		NotBefore: time.Unix(1000, 0),
		NotAfter:  time.Unix(100000, 0),

		BasicConstraintsValid: true,
		IsCA: true,
	}

	serialiseAndParse := func(template *Certificate) *Certificate {
		derBytes, err := CreateCertificate(rand.Reader, template, template, &rsaPriv.PublicKey, rsaPriv)
		if err != nil {
			t.Fatalf("failed to create certificate: %s", err)
			return nil
		}

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

		return cert
	}

	cert1 := serialiseAndParse(template)
	if m := cert1.MaxPathLen; m != -1 {
		t.Errorf("Omitting MaxPathLen didn't turn into -1, got %d", m)
	}
	if cert1.MaxPathLenZero {
		t.Errorf("Omitting MaxPathLen resulted in MaxPathLenZero")
	}

	template.MaxPathLen = 1
	cert2 := serialiseAndParse(template)
	if m := cert2.MaxPathLen; m != 1 {
		t.Errorf("Setting MaxPathLen didn't work. Got %d but set 1", m)
	}
	if cert2.MaxPathLenZero {
		t.Errorf("Setting MaxPathLen resulted in MaxPathLenZero")
	}

	template.MaxPathLen = 0
	template.MaxPathLenZero = true
	cert3 := serialiseAndParse(template)
	if m := cert3.MaxPathLen; m != 0 {
		t.Errorf("Setting MaxPathLenZero didn't work, got %d", m)
	}
	if !cert3.MaxPathLenZero {
		t.Errorf("Setting MaxPathLen to zero didn't result in MaxPathLenZero")
	}
}

func TestASN1BitLength(t *testing.T) {
	tests := []struct {
		bytes  []byte
		bitLen int
	}{
		{nil, 0},
		{[]byte{0x00}, 0},
		{[]byte{0x00, 0x00}, 0},
		{[]byte{0xf0}, 4},
		{[]byte{0x88}, 5},
		{[]byte{0xff}, 8},
		{[]byte{0xff, 0x80}, 9},
		{[]byte{0xff, 0x81}, 16},
	}

	for i, test := range tests {
		if got := asn1BitLength(test.bytes); got != test.bitLen {
			t.Errorf("#%d: calculated bit-length of %d for %x, wanted %d", i, got, test.bytes, test.bitLen)
		}
	}
}

func TestVerifyEmptyCertificate(t *testing.T) {
	if _, err := new(Certificate).Verify(VerifyOptions{}); err != errNotParsed {
		t.Errorf("Verifying empty certificate resulted in unexpected error: %q (wanted %q)", err, errNotParsed)
	}
}

func TestInsecureAlgorithmErrorString(t *testing.T) {
	tests := []struct {
		sa   SignatureAlgorithm
		want string
	}{
		{MD2WithRSA, "x509: cannot verify signature: insecure algorithm MD2-RSA"},
		{-1, "x509: cannot verify signature: insecure algorithm -1"},
		{0, "x509: cannot verify signature: insecure algorithm 0"},
		{9999, "x509: cannot verify signature: insecure algorithm 9999"},
	}
	for i, tt := range tests {
		if got := fmt.Sprint(InsecureAlgorithmError(tt.sa)); got != tt.want {
			t.Errorf("%d. mismatch.\n got: %s\nwant: %s\n", i, got, tt.want)
		}
	}
}

// These CSR was generated with OpenSSL:
//  openssl req -out CSR.csr -new -sha256 -nodes -keyout privateKey.key -config openssl.cnf
//
// With openssl.cnf containing the following sections:
//   [ v3_req ]
//   basicConstraints = CA:FALSE
//   keyUsage = nonRepudiation, digitalSignature, keyEncipherment
//   subjectAltName = email:gopher@golang.org,DNS:test.example.com
//   [ req_attributes ]
//   challengePassword = ignored challenge
//   unstructuredName  = ignored unstructured name
var csrBase64Array = [...]string{
	// Just [ v3_req ]
	"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",
	// Both [ v3_req ] and [ req_attributes ]
	"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",
}

var md5cert = `
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`

func TestMD5(t *testing.T) {
	pemBlock, _ := pem.Decode([]byte(md5cert))
	cert, err := ParseCertificate(pemBlock.Bytes)
	if err != nil {
		t.Fatalf("failed to parse certificate: %s", err)
	}
	if sa := cert.SignatureAlgorithm; sa != MD5WithRSA {
		t.Errorf("signature algorithm is %v, want %v", sa, MD5WithRSA)
	}
	if err = cert.CheckSignatureFrom(cert); err == nil {
		t.Fatalf("certificate verification succeeded incorrectly")
	}
	if _, ok := err.(InsecureAlgorithmError); !ok {
		t.Fatalf("certificate verification returned %v (%T), wanted InsecureAlgorithmError", err, err)
	}
}