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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| /** | ||
| * Tencent is pleased to support the open source community by making Polaris available. | ||
| * | ||
| * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved. | ||
| * | ||
| * Licensed under the BSD 3-Clause License (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://opensource.org/licenses/BSD-3-Clause | ||
| * | ||
| * 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 ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "crypto/rsa" | ||
| "crypto/x509" | ||
| "encoding/base64" | ||
| ) | ||
|
|
||
| // RSAKey RSA key pair | ||
| type RSAKey struct { | ||
| PrivateKey string | ||
| PublicKey string | ||
| } | ||
|
|
||
| // GenerateKey generate RSA key pair | ||
| func GenerateRSAKey() (*RSAKey, error) { | ||
| privateKey, err := rsa.GenerateKey(rand.Reader, 1024) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| rsaKey := &RSAKey{ | ||
| PrivateKey: base64.StdEncoding.EncodeToString(x509.MarshalPKCS1PrivateKey(privateKey)), | ||
| PublicKey: base64.StdEncoding.EncodeToString(x509.MarshalPKCS1PublicKey(&privateKey.PublicKey)), | ||
| } | ||
| return rsaKey, nil | ||
| } | ||
|
|
||
| // Encrypt RSA encrypt plaintext using public key | ||
| func Encrypt(plaintext, publicKey []byte) ([]byte, error) { | ||
| pub, err := x509.ParsePKCS1PublicKey(publicKey) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| totalLen := len(plaintext) | ||
| segLen := pub.Size() - 11 | ||
| start := 0 | ||
| buffer := bytes.Buffer{} | ||
| for start < totalLen { | ||
| end := start + segLen | ||
| if end > totalLen { | ||
| end = totalLen | ||
| } | ||
| seg, err := rsa.EncryptPKCS1v15(rand.Reader, pub, plaintext[start:end]) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| buffer.Write(seg) | ||
| start = end | ||
| } | ||
| return buffer.Bytes(), nil | ||
| } | ||
|
|
||
| // Decrypt RSA decrypt ciphertext using private key | ||
| func Decrypt(ciphertext, privateKey []byte) ([]byte, error) { | ||
| priv, err := x509.ParsePKCS1PrivateKey(privateKey) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| keySize := priv.Size() | ||
| totalLen := len(ciphertext) | ||
| start := 0 | ||
| buffer := bytes.Buffer{} | ||
| for start < totalLen { | ||
| end := start + keySize | ||
| if end > totalLen { | ||
| end = totalLen | ||
| } | ||
| seg, err := rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext[start:end]) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| buffer.Write(seg) | ||
| start = end | ||
| } | ||
| return buffer.Bytes(), nil | ||
| } | ||
|
|
||
| // EncryptToBase64 RSA encrypt plaintext and base64 encode ciphertext | ||
| func EncryptToBase64(plaintext []byte, base64PublicKey string) (string, error) { | ||
| pub, err := base64.StdEncoding.DecodeString(base64PublicKey) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| ciphertext, err := Encrypt(plaintext, pub) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return base64.StdEncoding.EncodeToString(ciphertext), nil | ||
| } | ||
|
|
||
| // DecryptFromBase64 base64 decode ciphertext and RSA decrypt | ||
| func DecryptFromBase64(base64Ciphertext, base64PrivateKey string) ([]byte, error) { | ||
| priv, err := base64.StdEncoding.DecodeString(base64PrivateKey) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| ciphertext, err := base64.StdEncoding.DecodeString(base64Ciphertext) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return Decrypt(ciphertext, priv) | ||
| } |
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