service/library/mycrypto/sha1withrsaCrypto.go

68 lines
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2024-06-18 17:10:42 +08:00
package mycrypto
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"service/library/logger"
)
type SHAwithRSACrypto struct {
privateKey *rsa.PrivateKey
publicKey *rsa.PublicKey
}
func NewSHAwithRSACryptoFromString(rsaPrivateKeyStr string) (crypto *SHAwithRSACrypto, err error) {
crypto = &SHAwithRSACrypto{}
rsaPriKey, err := base64.StdEncoding.DecodeString(rsaPrivateKeyStr)
if err != nil {
logger.Error("read rsa primary key failed!", err)
return
}
private, err := x509.ParsePKCS8PrivateKey(rsaPriKey)
if err != nil {
logger.Error("ParsePKCS8PrivateKey err", err)
return
}
crypto.privateKey = private.(*rsa.PrivateKey)
crypto.publicKey = &crypto.privateKey.PublicKey
return
}
func (p *SHAwithRSACrypto) Sign(data []byte) (string, error) {
h := crypto.Hash.New(crypto.SHA1)
h.Write(data)
hashed := h.Sum(nil)
signature, err := rsa.SignPKCS1v15(rand.Reader, p.privateKey,
crypto.SHA1, hashed)
if err != nil {
logger.Error("Error from signing: %s\n", err)
return "", err
}
sign := base64.StdEncoding.EncodeToString(signature) //转换成base64返回
return sign, nil
}
func (p *SHAwithRSACrypto) Verify(data []byte, sign string) error {
signBytes, err := base64.StdEncoding.DecodeString(sign)
if err != nil {
logger.Error("read sign bytes failed!", err)
return err
}
h := crypto.Hash.New(crypto.SHA1)
h.Write(data)
hashed := h.Sum(nil)
return rsa.VerifyPKCS1v15(p.publicKey, crypto.SHA1, hashed, signBytes)
}