package utils
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"encoding/hex"
"encoding/pem"
"errors"
"io/ioutil"
)
var (
Privkey string
)
func Sign(s string) (string, error) {
key, err := ioutil.ReadFile(Privkey)
if err != nil {
return "", err
}
r, err := encryptSHA1WithRSA(key, []byte(s))
if err != nil {
return "", err
}
return hex.EncodeToString(r), nil
}
func encryptSHA1WithRSA(key, data []byte) ([]byte, error) {
block, _ := pem.Decode(key)
if block == nil {
return nil, errors.New("no PEM data is found")
}
private, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
hashed := SHA1(data)
return rsa.SignPKCS1v15(rand.Reader, private, crypto.SHA1, hashed)
}
func SHA1(data []byte) []byte {
h := sha1.New()
h.Write(data)
return h.Sum(nil)
}
package utils
import (
"crypto"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"encoding/hex"
"encoding/pem"
"io/ioutil"
)
var (
Pubkey string
)
func VerifySig(origin, sig string) error {
b, err := ioutil.ReadFile(Pubkey)
if err != nil {
return err
}
block, _ := pem.Decode(b)
pub, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return err
}
hashed := SHA1([]byte(origin))
sigBytes, err := hex.DecodeString(sig)
if err != nil {
return err
}
return rsa.VerifyPKCS1v15(pub.(*rsa.PublicKey), crypto.SHA1, hashed, []byte(sigBytes))
}
func SHA1(data []byte) []byte {
h := sha1.New()
h.Write(data)
return h.Sum(nil)
}
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