diff --git a/goaes.go b/aes.go
similarity index 100%
rename from goaes.go
rename to aes.go
diff --git a/go.mod b/go.mod
index b61ef4f..67542f3 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module go.dtapp.net/goaes
 
-go 1.18
+go 1.21
diff --git a/rsa.go b/rsa.go
new file mode 100644
index 0000000..d8dd929
--- /dev/null
+++ b/rsa.go
@@ -0,0 +1,58 @@
+package goaes
+
+import (
+	"crypto"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"errors"
+	"strings"
+)
+
+func RsaSign(signContent string, privateKey string, hash crypto.Hash) string {
+	shaNew := hash.New()
+	shaNew.Write([]byte(signContent))
+	hashed := shaNew.Sum(nil)
+	priKey, err := ParsePrivateKey(privateKey)
+	if err != nil {
+		panic(err)
+	}
+
+	signature, err := rsa.SignPKCS1v15(rand.Reader, priKey, hash, hashed)
+	if err != nil {
+		panic(err)
+	}
+	return base64.StdEncoding.EncodeToString(signature)
+}
+
+func ParsePrivateKey(privateKey string) (*rsa.PrivateKey, error) {
+	privateKey = FormatPrivateKey(privateKey)
+	// 2、解码私钥字节，生成加密对象
+	block, _ := pem.Decode([]byte(privateKey))
+	if block == nil {
+		return nil, errors.New("私钥信息错误")
+	}
+	// 3、解析DER编码的私钥，生成私钥对象
+	priKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
+	if err != nil {
+		return nil, err
+	}
+	return priKey, nil
+}
+
+const (
+	PEM_BEGIN = "-----BEGIN RSA PRIVATE KEY-----\n"
+	PEM_END   = "\n-----END RSA PRIVATE KEY-----"
+)
+
+func FormatPrivateKey(privateKey string) string {
+	if !strings.HasPrefix(privateKey, PEM_BEGIN) {
+		privateKey = PEM_BEGIN + privateKey
+	}
+	if !strings.HasSuffix(privateKey, PEM_END) {
+		privateKey = privateKey + PEM_END
+	}
+	return privateKey
+}
diff --git a/version.go b/version.go
index 4542fc0..e8b21cf 100644
--- a/version.go
+++ b/version.go
@@ -1,3 +1,3 @@
 package goaes
 
-const Version = "1.0.0"
+const Version = "1.0.1"