/
rsa.go
75 lines (70 loc) · 1.6 KB
/
rsa.go
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// Package util go实用库
// RSA的签名及验签
// SHA256 With RSA
package util
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"errors"
"fmt"
)
// RSA RSA签名
func RSA(src, privateKey string) (s string, err error) {
//1.加载RSA的私钥
block, _ := pem.Decode([]byte(privateKey))
if block == nil {
err = errors.New("private_key error")
return
}
//pri, err := x509.ParsePKCS1PrivateKey(block.Bytes)
pri, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
return
}
rsaPri, _ := pri.(*rsa.PrivateKey)
hash := crypto.SHA256
//2.计算代签名字串的SHA256哈希值
hashed, err := SHA256([]byte(src))
if err != nil {
return
}
//3. base64 encode
sig, _ := rsa.SignPKCS1v15(rand.Reader, rsaPri, hash, hashed)
s = base64.StdEncoding.EncodeToString(sig)
return
}
// RSACheck RSA验签
func RSACheck(src, sign, publicKey string) (ok bool, err error) {
//1. 加载RSA的公钥
block, _ := pem.Decode([]byte(publicKey))
if block == nil {
err = errors.New("private_key error")
return
}
pub, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return
}
rsaPub, _ := pub.(*rsa.PublicKey)
//2. 计算代签名字串的SHA1哈希
digest, err := SHA256([]byte(src))
if err != nil {
return
}
//3. base64 decode
data, err := base64.StdEncoding.DecodeString(string(sign))
if err != nil {
return
}
//4. 调用rsa包的VerifyPKCS1v15验证签名有效性
err = rsa.VerifyPKCS1v15(rsaPub, crypto.SHA256, digest, data)
if err != nil {
err = fmt.Errorf("verify sig error, reason: %v", err)
return
}
return true, nil
}