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internals.go
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internals.go
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package certificates
import (
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"errors"
)
type basicConstraints struct {
IsCA bool `asn1:"optional"`
MaxPathLen int `asn1:"optional,default:-1"`
}
func marshalBasicConstraints(isCA bool, maxPathLen int, maxPathLenZero bool) (pkix.Extension, error) {
ext := pkix.Extension{Id: []int{2, 5, 29, 19}, Critical: true}
// Leaving MaxPathLen as zero indicates that no maximum path
// length is desired, unless MaxPathLenZero is set. A value of
// -1 causes encoding/asn1 to omit the value as desired.
if maxPathLen == 0 && !maxPathLenZero {
maxPathLen = -1
}
var err error
ext.Value, err = asn1.Marshal(basicConstraints{isCA, maxPathLen})
if err != nil {
return ext, nil
}
return ext, nil
}
func marshalKeyUsage(ku x509.KeyUsage) (pkix.Extension, error) {
ext := pkix.Extension{Id: oidExtensionKeyUsage, Critical: true}
var a [2]byte
a[0] = reverseBitsInAByte(byte(ku))
a[1] = reverseBitsInAByte(byte(ku >> 8))
l := 1
if a[1] != 0 {
l = 2
}
bitString := a[:l]
var err error
ext.Value, err = asn1.Marshal(asn1.BitString{Bytes: bitString, BitLength: asn1BitLength(bitString)})
if err != nil {
return ext, err
}
return ext, nil
}
func marshalExtKeyUsage(extUsages []x509.ExtKeyUsage, unknownUsages []asn1.ObjectIdentifier) (pkix.Extension, error) {
ext := pkix.Extension{Id: oidExtensionExtendedKeyUsage}
oids := make([]asn1.ObjectIdentifier, len(extUsages)+len(unknownUsages))
for i, u := range extUsages {
if oid, ok := oidFromExtKeyUsage(u); ok {
oids[i] = oid
} else {
return ext, errors.New("x509: unknown extended key usage")
}
}
copy(oids[len(extUsages):], unknownUsages)
var err error
ext.Value, err = asn1.Marshal(oids)
if err != nil {
return ext, err
}
return ext, nil
}
func oidFromExtKeyUsage(eku x509.ExtKeyUsage) (oid asn1.ObjectIdentifier, ok bool) {
for _, pair := range extKeyUsageOIDs {
if eku == pair.extKeyUsage {
return pair.oid, true
}
}
return
}
var extKeyUsageOIDs = []struct {
extKeyUsage x509.ExtKeyUsage
oid asn1.ObjectIdentifier
}{
{x509.ExtKeyUsageAny, oidExtKeyUsageAny},
{x509.ExtKeyUsageServerAuth, oidExtKeyUsageServerAuth},
{x509.ExtKeyUsageClientAuth, oidExtKeyUsageClientAuth},
{x509.ExtKeyUsageCodeSigning, oidExtKeyUsageCodeSigning},
{x509.ExtKeyUsageEmailProtection, oidExtKeyUsageEmailProtection},
{x509.ExtKeyUsageIPSECEndSystem, oidExtKeyUsageIPSECEndSystem},
{x509.ExtKeyUsageIPSECTunnel, oidExtKeyUsageIPSECTunnel},
{x509.ExtKeyUsageIPSECUser, oidExtKeyUsageIPSECUser},
{x509.ExtKeyUsageTimeStamping, oidExtKeyUsageTimeStamping},
{x509.ExtKeyUsageOCSPSigning, oidExtKeyUsageOCSPSigning},
{x509.ExtKeyUsageMicrosoftServerGatedCrypto, oidExtKeyUsageMicrosoftServerGatedCrypto},
{x509.ExtKeyUsageNetscapeServerGatedCrypto, oidExtKeyUsageNetscapeServerGatedCrypto},
{x509.ExtKeyUsageMicrosoftCommercialCodeSigning, oidExtKeyUsageMicrosoftCommercialCodeSigning},
{x509.ExtKeyUsageMicrosoftKernelCodeSigning, oidExtKeyUsageMicrosoftKernelCodeSigning},
}
var (
oidExtKeyUsageAny = asn1.ObjectIdentifier{2, 5, 29, 37, 0}
oidExtKeyUsageServerAuth = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 1}
oidExtKeyUsageClientAuth = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 2}
oidExtKeyUsageCodeSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 3}
oidExtKeyUsageEmailProtection = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 4}
oidExtKeyUsageIPSECEndSystem = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 5}
oidExtKeyUsageIPSECTunnel = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 6}
oidExtKeyUsageIPSECUser = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 7}
oidExtKeyUsageTimeStamping = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 8}
oidExtKeyUsageOCSPSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 5, 5, 7, 3, 9}
oidExtKeyUsageMicrosoftServerGatedCrypto = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 10, 3, 3}
oidExtKeyUsageNetscapeServerGatedCrypto = asn1.ObjectIdentifier{2, 16, 840, 1, 113730, 4, 1}
oidExtKeyUsageMicrosoftCommercialCodeSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 2, 1, 22}
oidExtKeyUsageMicrosoftKernelCodeSigning = asn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 61, 1, 1}
oidExtensionKeyUsage = []int{2, 5, 29, 15}
oidExtensionExtendedKeyUsage = []int{2, 5, 29, 37}
)
func asn1BitLength(bitString []byte) int {
bitLen := len(bitString) * 8
for i := range bitString {
b := bitString[len(bitString)-i-1]
for bit := uint(0); bit < 8; bit++ {
if (b>>bit)&1 == 1 {
return bitLen
}
bitLen--
}
}
return 0
}
func reverseBitsInAByte(in byte) byte {
b1 := in>>4 | in<<4
b2 := b1>>2&0x33 | b1<<2&0xcc
b3 := b2>>1&0x55 | b2<<1&0xaa
return b3
}