diff --git a/cryptox/asymmetric/cryptoa.go b/cryptox/asymmetric/cryptoa.go
new file mode 100644
index 0000000..0b3f53a
--- /dev/null
+++ b/cryptox/asymmetric/cryptoa.go
@@ -0,0 +1,12 @@
+package asymmetric
+
+import (
+	"github.com/suyuan32/knife/cryptox/asymmetric/rsa"
+)
+
+// NewRSA returns an RSA struct.
+func NewRSA() *rsa.RSA {
+	return &rsa.RSA{
+		Standard: rsa.PKCS1,
+	}
+}
diff --git a/cryptox/asymmetric/rsa/input.go b/cryptox/asymmetric/rsa/input.go
new file mode 100644
index 0000000..4267190
--- /dev/null
+++ b/cryptox/asymmetric/rsa/input.go
@@ -0,0 +1,49 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rsa
+
+import (
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+)
+
+// InputFromBytes set input data from byte slice.
+func (s *RSA) InputFromBytes(data []byte) *RSA {
+	s.InputData = data
+	return s
+}
+
+// InputFromString set input data from string.
+func (s *RSA) InputFromString(data string) *RSA {
+	s.InputData = []byte(data)
+	return s
+}
+
+// InputFromBase64String set input data from base64 string.
+func (s *RSA) InputFromBase64String(data string) *RSA {
+	result, err := base64.StdEncoding.DecodeString(data)
+	s.Errors = errors.Join(s.Errors, err)
+	s.InputData = result
+	return s
+}
+
+// InputFromHexString set input data from hex string.
+func (s *RSA) InputFromHexString(data string) *RSA {
+	result, err := hex.DecodeString(data)
+	s.Errors = errors.Join(s.Errors, err)
+	s.InputData = result
+	return s
+}
diff --git a/cryptox/asymmetric/rsa/key.go b/cryptox/asymmetric/rsa/key.go
new file mode 100644
index 0000000..2dd8b71
--- /dev/null
+++ b/cryptox/asymmetric/rsa/key.go
@@ -0,0 +1,73 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rsa
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"fmt"
+)
+
+var (
+	errorNotValidPEMKey     = errors.New("the key must be a PEM string encoded by PKCS1 or PKCS8")
+	errorNotValidPrivateKey = errors.New("the key is not a valid RSA private key")
+	errorNotValidPublicKey  = errors.New(" the key is not a valid RSA public key")
+)
+
+// GenerateKeyPair set public key and private key for RSA struct.
+func (s *RSA) GenerateKeyPair(bits int) *RSA {
+	privateKey, err := rsa.GenerateKey(rand.Reader, bits)
+	if err != nil {
+		s.Errors = errors.Join(s.Errors, fmt.Errorf("rsa: generate key pair failed, err : %v", err))
+		return s
+	}
+	s.PrivateKey = privateKey
+	s.PublicKey = &privateKey.PublicKey
+	return s
+}
+
+// PrivateKeyFromPEM gets private key from a PEM byte slice.
+func (s *RSA) PrivateKeyFromPEM(data []byte) *RSA {
+	block, _ := pem.Decode(data)
+	if block == nil {
+		s.Errors = errors.Join(s.Errors, errorNotValidPEMKey)
+		return s
+	}
+
+	switch s.Standard {
+	case PKCS1:
+		if parse, err := x509.ParsePKCS1PrivateKey(block.Bytes); err != nil {
+			s.Errors = errors.Join(s.Errors, errorNotValidPrivateKey)
+			return s
+		} else {
+			s.PrivateKey = parse
+			return s
+		}
+	case PKCS8:
+		if parse, err := x509.ParsePKCS8PrivateKey(block.Bytes); err != nil {
+			s.Errors = errors.Join(s.Errors, errorNotValidPrivateKey)
+			return s
+		} else {
+			s.PrivateKey = parse.(*rsa.PrivateKey)
+			return s
+		}
+	default:
+		s.Errors = errors.Join(s.Errors, errorNotValidPrivateKey)
+		return s
+	}
+}
diff --git a/cryptox/asymmetric/rsa/output.go b/cryptox/asymmetric/rsa/output.go
new file mode 100644
index 0000000..4a224eb
--- /dev/null
+++ b/cryptox/asymmetric/rsa/output.go
@@ -0,0 +1,26 @@
+package rsa
+
+import (
+	"encoding/base64"
+	"encoding/hex"
+)
+
+// ToString output data with string type.
+func (s *RSA) ToString() (string, error) {
+	return string(s.OutputData), s.Errors
+}
+
+// ToBytes output data with byte type.
+func (s *RSA) ToBytes() ([]byte, error) {
+	return s.OutputData, s.Errors
+}
+
+// ToBase64String output data with base64 string.
+func (s *RSA) ToBase64String() (string, error) {
+	return base64.StdEncoding.EncodeToString(s.OutputData), s.Errors
+}
+
+// ToHexString output data with hex string.
+func (s *RSA) ToHexString() (string, error) {
+	return hex.EncodeToString(s.OutputData), s.Errors
+}
diff --git a/cryptox/asymmetric/rsa/rsa.go b/cryptox/asymmetric/rsa/rsa.go
new file mode 100644
index 0000000..333195a
--- /dev/null
+++ b/cryptox/asymmetric/rsa/rsa.go
@@ -0,0 +1,42 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rsa
+
+import (
+	"crypto/rsa"
+)
+
+type RSA struct {
+	PrivateKey *rsa.PrivateKey
+
+	PublicKey *rsa.PublicKey
+
+	Key []byte
+
+	InputData []byte
+
+	OutputData []byte
+
+	Standard Standard
+
+	Errors error
+}
+
+type Standard uint8
+
+const (
+	PKCS1 Standard = 1 + iota
+	PKCS8
+)
diff --git a/cryptox/symmetric/cipher.go b/cryptox/symmetric/cipher.go
index 6c88ce0..0306ff4 100644
--- a/cryptox/symmetric/cipher.go
+++ b/cryptox/symmetric/cipher.go
@@ -1,3 +1,17 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package symmetric
 
 import (
diff --git a/cryptox/symmetric/decrypt.go b/cryptox/symmetric/decrypt.go
index c2e88b2..3235f8c 100644
--- a/cryptox/symmetric/decrypt.go
+++ b/cryptox/symmetric/decrypt.go
@@ -1,3 +1,17 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package symmetric
 
 import (
diff --git a/cryptox/symmetric/encrypt.go b/cryptox/symmetric/encrypt.go
index 0fa5ab6..93feaec 100644
--- a/cryptox/symmetric/encrypt.go
+++ b/cryptox/symmetric/encrypt.go
@@ -1,3 +1,17 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package symmetric
 
 import (
diff --git a/cryptox/symmetric/iv.go b/cryptox/symmetric/iv.go
index 0cba2aa..94277ff 100644
--- a/cryptox/symmetric/iv.go
+++ b/cryptox/symmetric/iv.go
@@ -1,3 +1,17 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package symmetric
 
 import (
diff --git a/cryptox/symmetric/key.go b/cryptox/symmetric/key.go
index 77884ec..36c8a31 100644
--- a/cryptox/symmetric/key.go
+++ b/cryptox/symmetric/key.go
@@ -1,3 +1,17 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package symmetric
 
 import (
diff --git a/cryptox/symmetric/method/method.go b/cryptox/symmetric/method/method.go
index 5c921a2..f878292 100644
--- a/cryptox/symmetric/method/method.go
+++ b/cryptox/symmetric/method/method.go
@@ -1,3 +1,17 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package method
 
 // MethodType is the encryption method such as AES.
diff --git a/cryptox/symmetric/mode/mode.go b/cryptox/symmetric/mode/mode.go
index 3c4564f..5c7c5ce 100644
--- a/cryptox/symmetric/mode/mode.go
+++ b/cryptox/symmetric/mode/mode.go
@@ -1,3 +1,17 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package mode
 
 // ModeType is the encrypted mode.
diff --git a/cryptox/symmetric/validator.go b/cryptox/symmetric/validator.go
index 8562e92..6a95d9b 100644
--- a/cryptox/symmetric/validator.go
+++ b/cryptox/symmetric/validator.go
@@ -1,3 +1,17 @@
+// Copyright 2023 The Ryan SU Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 package symmetric
 
 import (