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package goaes
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"errors"
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"strings"
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)
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func RsaSign(signContent string, privateKey string, hash crypto.Hash) string {
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shaNew := hash.New()
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shaNew.Write([]byte(signContent))
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hashed := shaNew.Sum(nil)
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priKey, err := ParsePrivateKey(privateKey)
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if err != nil {
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panic(err)
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}
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signature, err := rsa.SignPKCS1v15(rand.Reader, priKey, hash, hashed)
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if err != nil {
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panic(err)
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}
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return base64.StdEncoding.EncodeToString(signature)
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}
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func ParsePrivateKey(privateKey string) (*rsa.PrivateKey, error) {
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privateKey = FormatPrivateKey(privateKey)
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// 2、解码私钥字节,生成加密对象
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block, _ := pem.Decode([]byte(privateKey))
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if block == nil {
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return nil, errors.New("私钥信息错误")
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}
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// 3、解析DER编码的私钥,生成私钥对象
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priKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
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if err != nil {
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return nil, err
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}
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return priKey, nil
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}
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const (
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PEM_BEGIN = "-----BEGIN RSA PRIVATE KEY-----\n"
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PEM_END = "\n-----END RSA PRIVATE KEY-----"
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)
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func FormatPrivateKey(privateKey string) string {
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if !strings.HasPrefix(privateKey, PEM_BEGIN) {
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privateKey = PEM_BEGIN + privateKey
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}
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if !strings.HasSuffix(privateKey, PEM_END) {
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privateKey = privateKey + PEM_END
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}
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return privateKey
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}
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