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crypto_utils.go
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crypto_utils.go
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package ios
import (
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/pem"
"errors"
"fmt"
"math/big"
"regexp"
"strings"
"time"
)
//This code could be a little nicer
func createRootCertificate(publicKeyBytes []byte) ([]byte, []byte, []byte, []byte, []byte, error) {
reader := rand.Reader
bitSize := 2048
rootKeyPair, err := rsa.GenerateKey(reader, bitSize)
if err != nil {
return nil, nil, nil, nil, nil, err
}
var b big.Int
b.SetInt64(0)
rootCertTemplate := x509.Certificate{
SerialNumber: &b,
Subject: pkix.Name{},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
SignatureAlgorithm: x509.SHA1WithRSA,
BasicConstraintsValid: true,
IsCA: true,
}
digestString, _ := computeSKIKey(&rootKeyPair.PublicKey)
rootCertTemplate.ExtraExtensions = []pkix.Extension{
{
Id: []int{2, 5, 29, 14},
Value: []byte(digestString),
}}
rootCert, err := x509.CreateCertificate(rand.Reader, &rootCertTemplate, &rootCertTemplate, &rootKeyPair.PublicKey, rootKeyPair)
if err != nil {
return nil, nil, nil, nil, nil, err
}
hostCertTemplate := x509.Certificate{
SerialNumber: &b,
Subject: pkix.Name{},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
SignatureAlgorithm: x509.SHA1WithRSA,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
//ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
IsCA: false,
}
hostCertTemplate.ExtraExtensions = []pkix.Extension{
{
Id: []int{2, 5, 29, 14},
Value: (digestString),
}}
block, _ := pem.Decode([]byte(publicKeyBytes))
if block == nil {
return nil, nil, nil, nil, nil, errors.New("failed to parse PEM block containing the public key")
}
var devicePublicKey rsa.PublicKey
_, err1 := asn1.Unmarshal(block.Bytes, &devicePublicKey)
if err1 != nil {
return nil, nil, nil, nil, nil, err1
}
deviceCertTemplate := x509.Certificate{
SerialNumber: &b,
Subject: pkix.Name{},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
SignatureAlgorithm: x509.SHA1WithRSA,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
BasicConstraintsValid: true,
IsCA: false,
}
digestString2, _ := computeSKIKey(&devicePublicKey)
deviceCertTemplate.ExtraExtensions = []pkix.Extension{
{
Id: []int{2, 5, 29, 14},
Value: (digestString2),
}}
hostCert, err := x509.CreateCertificate(rand.Reader, &hostCertTemplate, &hostCertTemplate, &rootKeyPair.PublicKey, rootKeyPair)
if err != nil {
return nil, nil, nil, nil, nil, err
}
deviceCert, err := x509.CreateCertificate(rand.Reader, &deviceCertTemplate, &deviceCertTemplate, &devicePublicKey, rootKeyPair)
if err != nil {
return nil, nil, nil, nil, nil, err
}
return certBytesToPEM(rootCert), certBytesToPEM(hostCert), certBytesToPEM(deviceCert), savePEMKey(rootKeyPair), savePEMKey(rootKeyPair), nil
}
func computeSKIKey(pub *rsa.PublicKey) ([]byte, error) {
encodedPub, err := x509.MarshalPKIXPublicKey(pub)
if err != nil {
return nil, err
}
var subPKI subjectPublicKeyInfo
_, err = asn1.Unmarshal(encodedPub, &subPKI)
if err != nil {
return nil, err
}
pubHash := sha1.Sum(subPKI.SubjectPublicKey.Bytes)
digestString := toHexString(pubHash[:])
return []byte(digestString), nil
}
func toHexString(bytes []byte) string {
digestString := fmt.Sprintf("%x", bytes)
if len(digestString)%2 == 1 {
digestString = "0" + digestString
}
re := regexp.MustCompile("..")
digestString = strings.TrimRight(re.ReplaceAllString(digestString, "$0:"), ":")
digestString = strings.ToUpper(digestString)
return digestString
}
type subjectPublicKeyInfo struct {
Algorithm pkix.AlgorithmIdentifier
SubjectPublicKey asn1.BitString
}
func certBytesToPEM(certBytes []byte) []byte {
pemCert := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certBytes})
return pemCert
}
func savePEMKey(key *rsa.PrivateKey) []byte {
var privateKey = &pem.Block{
Type: "PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
return pem.EncodeToMemory(privateKey)
}