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crypto/x509: support certificate creation.
R=rsc CC=golang-dev https://golang.org/cl/212041
This commit is contained in:
Adam Langley
parent
55828cee94
commit
32c3c95339
@ -12,6 +12,7 @@ import (
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"crypto/rsa"
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"crypto/sha1"
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"hash"
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"io"
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"os"
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"strings"
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"time"
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@ -69,6 +70,21 @@ func ParsePKCS1PrivateKey(der []byte) (key *rsa.PrivateKey, err os.Error) {
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return
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}
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// MarshalPKCS1PrivateKey converts a private key to ASN.1 DER encoded form.
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func MarshalPKCS1PrivateKey(key *rsa.PrivateKey) []byte {
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priv := pkcs1PrivateKey{
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Version: 1,
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N: asn1.RawValue{Tag: 2, Bytes: key.PublicKey.N.Bytes()},
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E: key.PublicKey.E,
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D: asn1.RawValue{Tag: 2, Bytes: key.D.Bytes()},
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P: asn1.RawValue{Tag: 2, Bytes: key.P.Bytes()},
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Q: asn1.RawValue{Tag: 2, Bytes: key.Q.Bytes()},
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}
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b, _ := asn1.MarshalToMemory(priv)
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return b
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}
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// These structures reflect the ASN.1 structure of X.509 certificates.:
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type certificate struct {
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@ -86,8 +102,8 @@ type tbsCertificate struct {
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Validity validity
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Subject rdnSequence
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PublicKey publicKeyInfo
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UniqueId asn1.BitString "optional,explicit,tag:1"
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SubjectUniqueId asn1.BitString "optional,explicit,tag:2"
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UniqueId asn1.BitString "optional,tag:1"
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SubjectUniqueId asn1.BitString "optional,tag:2"
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Extensions []extension "optional,explicit,tag:3"
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}
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@ -188,6 +204,64 @@ func (n *Name) fillFromRDNSequence(rdns *rdnSequence) {
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}
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}
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var (
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oidCountry = []int{2, 5, 4, 6}
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oidOrganization = []int{2, 5, 4, 10}
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oidOrganizationalUnit = []int{2, 5, 4, 11}
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oidCommonName = []int{2, 5, 4, 3}
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oidSerialNumber = []int{2, 5, 4, 5}
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oidLocatity = []int{2, 5, 4, 7}
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oidProvince = []int{2, 5, 4, 8}
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oidStreetAddress = []int{2, 5, 4, 9}
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oidPostalCode = []int{2, 5, 4, 17}
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)
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func (n Name) toRDNSequence() (ret rdnSequence) {
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ret = make([]relativeDistinguishedNameSET, 9 /* maximum number of elements */ )
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i := 0
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if len(n.Country) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidCountry, n.Country}}
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i++
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}
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if len(n.Organization) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidOrganization, n.Organization}}
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i++
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}
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if len(n.OrganizationalUnit) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidOrganizationalUnit, n.OrganizationalUnit}}
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i++
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}
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if len(n.CommonName) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidCommonName, n.CommonName}}
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i++
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}
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if len(n.SerialNumber) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidSerialNumber, n.SerialNumber}}
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i++
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}
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if len(n.Locality) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidLocatity, n.Locality}}
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i++
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}
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if len(n.Province) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidProvince, n.Province}}
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i++
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}
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if len(n.StreetAddress) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidStreetAddress, n.StreetAddress}}
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i++
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}
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if len(n.PostalCode) > 0 {
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ret[i] = []attributeTypeAndValue{attributeTypeAndValue{oidPostalCode, n.PostalCode}}
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i++
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}
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// Adding another RDN here? Remember to update the maximum number of
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// elements in the make() at the top of the function.
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return ret[0:i]
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}
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func getSignatureAlgorithmFromOID(oid []int) SignatureAlgorithm {
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if len(oid) == 7 && oid[0] == 1 && oid[1] == 2 && oid[2] == 840 &&
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oid[3] == 113549 && oid[4] == 1 && oid[5] == 1 {
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@ -589,3 +663,157 @@ func ParseCertificates(asn1Data []byte) ([]*Certificate, os.Error) {
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return ret, nil
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}
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func reverseBitsInAByte(in byte) byte {
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b1 := in>>4 | in<<4
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b2 := b1>>2&0x33 | b1<<2&0xcc
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b3 := b2>>1&0x55 | b2<<1&0xaa
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return b3
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}
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var (
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oidExtensionSubjectKeyId = []int{2, 5, 29, 14}
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oidExtensionKeyUsage = []int{2, 5, 29, 15}
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oidExtensionAuthorityKeyId = []int{2, 5, 29, 35}
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oidExtensionBasicConstraints = []int{2, 5, 29, 19}
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oidExtensionSubjectAltName = []int{2, 5, 29, 17}
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)
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func buildExtensions(template *Certificate) (ret []extension, err os.Error) {
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ret = make([]extension, 5 /* maximum number of elements. */ )
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n := 0
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if template.KeyUsage != 0 {
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ret[n].Id = oidExtensionKeyUsage
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ret[n].Critical = true
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var a [2]byte
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a[0] = reverseBitsInAByte(byte(template.KeyUsage))
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a[1] = reverseBitsInAByte(byte(template.KeyUsage >> 8))
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l := 1
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if a[1] != 0 {
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l = 2
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}
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ret[n].Value, err = asn1.MarshalToMemory(asn1.BitString{Bytes: a[0:l], BitLength: l * 8})
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if err != nil {
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return
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}
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n++
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}
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if template.BasicConstraintsValid {
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ret[n].Id = oidExtensionBasicConstraints
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ret[n].Value, err = asn1.MarshalToMemory(basicConstraints{template.IsCA, template.MaxPathLen})
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ret[n].Critical = true
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if err != nil {
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return
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}
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n++
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}
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if len(template.SubjectKeyId) > 0 {
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ret[n].Id = oidExtensionSubjectKeyId
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ret[n].Value, err = asn1.MarshalToMemory(template.SubjectKeyId)
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if err != nil {
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return
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}
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n++
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}
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if len(template.AuthorityKeyId) > 0 {
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ret[n].Id = oidExtensionAuthorityKeyId
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ret[n].Value, err = asn1.MarshalToMemory(authKeyId{template.AuthorityKeyId})
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if err != nil {
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return
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}
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n++
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}
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if len(template.DNSNames) > 0 {
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ret[n].Id = oidExtensionSubjectAltName
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rawValues := make([]asn1.RawValue, len(template.DNSNames))
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for i, name := range template.DNSNames {
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rawValues[i] = asn1.RawValue{Tag: 2, Class: 2, Bytes: strings.Bytes(name)}
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}
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ret[n].Value, err = asn1.MarshalToMemory(rawValues)
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if err != nil {
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return
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}
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n++
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}
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// Adding another extension here? Remember to update the maximum number
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// of elements in the make() at the top of the function.
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return ret[0:n], nil
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}
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var (
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oidSHA1WithRSA = []int{1, 2, 840, 113549, 1, 1, 5}
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oidRSA = []int{1, 2, 840, 113549, 1, 1, 1}
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)
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// CreateSelfSignedCertificate creates a new certificate based on
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// a template. The following members of template are used: SerialNumber,
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// Subject, NotBefore, NotAfter, KeyUsage, BasicConstraintsValid, IsCA,
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// MaxPathLen, SubjectKeyId, DNSNames.
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//
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// The certificate is signed by parent. If parent is equal to template then the
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// certificate is self-signed.
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//
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// The returned slice is the certificate in DER encoding.
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func CreateCertificate(rand io.Reader, template, parent *Certificate, priv *rsa.PrivateKey) (cert []byte, err os.Error) {
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asn1PublicKey, err := asn1.MarshalToMemory(rsaPublicKey{
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N: asn1.RawValue{Tag: 2, Bytes: priv.PublicKey.N.Bytes()},
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E: priv.PublicKey.E,
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})
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if err != nil {
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return
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}
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if len(template.SubjectKeyId) > 0 && len(parent.SubjectKeyId) > 0 {
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template.AuthorityKeyId = parent.SubjectKeyId
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}
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extensions, err := buildExtensions(template)
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if err != nil {
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return
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}
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encodedPublicKey := asn1.BitString{BitLength: len(asn1PublicKey) * 8, Bytes: asn1PublicKey}
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c := tbsCertificate{
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Version: 3,
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SerialNumber: asn1.RawValue{Bytes: template.SerialNumber, Tag: 2},
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SignatureAlgorithm: algorithmIdentifier{oidSHA1WithRSA},
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Issuer: parent.Subject.toRDNSequence(),
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Validity: validity{template.NotBefore, template.NotAfter},
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Subject: template.Subject.toRDNSequence(),
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PublicKey: publicKeyInfo{algorithmIdentifier{oidRSA}, encodedPublicKey},
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Extensions: extensions,
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}
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tbsCertContents, err := asn1.MarshalToMemory(c)
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if err != nil {
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return
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}
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c.Raw = tbsCertContents
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h := sha1.New()
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h.Write(tbsCertContents)
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digest := h.Sum()
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signature, err := rsa.SignPKCS1v15(rand, priv, rsa.HashSHA1, digest)
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if err != nil {
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return
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}
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cert, err = asn1.MarshalToMemory(certificate{
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c,
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algorithmIdentifier{oidSHA1WithRSA},
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asn1.BitString{Bytes: signature, BitLength: len(signature) * 8},
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})
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return
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}
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@ -9,9 +9,11 @@ import (
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"crypto/rsa"
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"encoding/hex"
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"encoding/pem"
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"os"
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"reflect"
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"strings"
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"testing"
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"time"
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)
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func TestParsePKCS1PrivateKey(t *testing.T) {
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@ -142,3 +144,51 @@ var certBytes = "308203223082028ba00302010202106edf0d9499fd4533dd1297fc42a93be13
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"e9e83994dcab72792f06bfab8170c4a8edea5334edef1e53d906c7562bd15cf4d18a8eb42bb137" +
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"9048084225c53e8acb7feb6f04d16dc574a2f7a27c7b603c77cd0ece48027f012fb69b37e02a2a" +
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"36dcd585d6ace53f546f961e05af"
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func TestCreateSelfSignedCertificate(t *testing.T) {
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urandom, err := os.Open("/dev/urandom", os.O_RDONLY, 0)
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if err != nil {
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t.Errorf("failed to open /dev/urandom")
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}
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block, _ := pem.Decode(strings.Bytes(pemPrivateKey))
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priv, err := ParsePKCS1PrivateKey(block.Bytes)
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if err != nil {
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t.Errorf("Failed to parse private key: %s", err)
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return
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}
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template := Certificate{
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SerialNumber: []byte{1},
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Subject: Name{
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CommonName: "test.example.com",
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Organization: "Acme Co",
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},
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NotBefore: time.SecondsToUTC(1000),
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NotAfter: time.SecondsToUTC(100000),
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SubjectKeyId: []byte{1, 2, 3, 4},
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KeyUsage: KeyUsageCertSign,
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BasicConstraintsValid: true,
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IsCA: true,
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DNSNames: []string{"test.example.com"},
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}
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derBytes, err := CreateCertificate(urandom, &template, &template, priv)
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if err != nil {
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t.Errorf("Failed to create certificate: %s", err)
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return
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}
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cert, err := ParseCertificate(derBytes)
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if err != nil {
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t.Errorf("Failed to parse certificate: %s", err)
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return
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}
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err = cert.CheckSignatureFrom(cert)
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if err != nil {
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t.Errorf("Signature verification failed: %s", err)
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return
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}
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}
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