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rsa.go
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rsa.go
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package cryptology
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/pem"
"errors"
)
// GenRsaKey 生成 RSA 公钥 私钥文件
func GenRsaKey() (prvKey, pubKey []byte, err error) {
privateKey, err := rsa.GenerateKey(rand.Reader, 1024)
if err != nil {
return nil, nil, err
}
derStream := x509.MarshalPKCS1PrivateKey(privateKey)
block := &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: derStream,
}
prvKey = pem.EncodeToMemory(block)
publicKey := &privateKey.PublicKey
derPkix, err := x509.MarshalPKIXPublicKey(publicKey)
if err != nil {
return nil, nil, err
}
block = &pem.Block{
Type: "PUBLIC KEY",
Bytes: derPkix,
}
pubKey = pem.EncodeToMemory(block)
return
}
// RsaSignWithSha256 RAS SHA256 签名
func RsaSignWithSha256(data []byte, keyBytes []byte) ([]byte, error) {
h := sha256.New()
h.Write(data)
hashed := h.Sum(nil)
block, _ := pem.Decode(keyBytes)
if block == nil {
return nil, errors.New("private key error")
}
privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
signature, err := rsa.SignPKCS1v15(rand.Reader, privateKey, crypto.SHA256, hashed)
if err != nil {
return nil, err
}
return signature, nil
}
// RsaVerySignWithSha256 RAS SHA256 验签
func RsaVerySignWithSha256(data, signData, keyBytes []byte) (bool, error) {
block, _ := pem.Decode(keyBytes)
if block == nil {
return false, errors.New("public key error")
}
pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return false, err
}
hashed := sha256.Sum256(data)
err = rsa.VerifyPKCS1v15(pubKey.(*rsa.PublicKey), crypto.SHA256, hashed[:], signData)
if err != nil {
return false, err
}
return true, nil
}
// RsaEncrypt RSA 公钥加密
func RsaEncrypt(data, keyBytes []byte) ([]byte, error) {
//解密pem格式的公钥
block, _ := pem.Decode(keyBytes)
if block == nil {
return nil, errors.New("public key error")
}
// 解析公钥
pubInterface, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, err
}
// 类型断言
pub := pubInterface.(*rsa.PublicKey)
//加密
ciphertext, err := rsa.EncryptPKCS1v15(rand.Reader, pub, data)
if err != nil {
return nil, err
}
return ciphertext, nil
}
// RsaDecrypt rsa 公钥解密
func RsaDecrypt(ciphertext, keyBytes []byte) ([]byte, error) {
//获取私钥
block, _ := pem.Decode(keyBytes)
if block == nil {
return nil, errors.New("private key error!")
}
//解析PKCS1格式的私钥
priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
// 解密
data, err := rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext)
if err != nil {
return nil, err
}
return data, nil
}