Go语言实现RSA和AES加解密
密码学里目前有两大经典算法,一个是对称加解密,其代表是 AES 加解密;另一个是非对加解密,其代表是 RSA 加解密。这里就以这两个经典算法为例,简单列下其在Go语言里实现的代码。
AES 加解密
AES 加密又分为 ECB、CBC、CFB、OFB 等几种,这里只列两种吧。1) CBC 加解密
package main import( "bytes" "crypto/aes" "fmt" "crypto/cipher" "encoding/base64" ) func main() { orig := "hello world" //key := "123456781234567812345678" key := "9871267812345mn812345xyz" fmt.Println("原文:", orig) encryptCode := AesEncrypt(orig, key) fmt.Println("密文:" , encryptCode) decryptCode := AesDecrypt(encryptCode, key) fmt.Println("解密结果:", decryptCode) } func AesEncrypt(orig string, key string) string { // 转成字节数组 origData := []byte(orig) k := []byte(key) // 分组秘钥 block, _ := aes.NewCipher(k) // 获取秘钥块的长度 blockSize := block.BlockSize() // 补全码 origData = PKCS7Padding(origData, blockSize) // 加密模式 blockMode := cipher.NewCBCEncrypter(block, k[:blockSize]) // 创建数组 cryted := make([]byte, len(origData)) // 加密 blockMode.CryptBlocks(cryted, origData) return base64.StdEncoding.EncodeToString(cryted) } func AesDecrypt(cryted string, key string) string { // 转成字节数组 crytedByte, _ := base64.StdEncoding.DecodeString(cryted) k := []byte(key) // 分组秘钥 block, _ := aes.NewCipher(k) // 获取秘钥块的长度 blockSize := block.BlockSize() // 加密模式 blockMode := cipher.NewCBCDecrypter(block, k[:blockSize]) // 创建数组 orig := make([]byte, len(crytedByte)) // 解密 blockMode.CryptBlocks(orig, crytedByte) // 去补全码 orig = PKCS7UnPadding(orig) return string(orig) } //补码 func PKCS7Padding(ciphertext []byte, blocksize int) []byte { padding := blocksize - len(ciphertext)%blocksize padtext := bytes.Repeat([]byte{byte(padding)}, padding) return append(ciphertext, padtext...) } //去码 func PKCS7UnPadding(origData []byte) []byte { length := len(origData) unpadding := int(origData[length-1]) return origData[:(length - unpadding)] }其运行结果如下:
D:\code>go run main.go
原文: hello world
密文: v3/NfSN7XwqXu2gC08+3QA==
解密结果: hello world
2) CFB 加解密
代码如下:package main import ( "crypto/aes" "crypto/cipher" "fmt" "os" ) var commonIV = []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f} func main() { //需要去加密的字符串 plaintext := []byte("My name is Astaxie") //如果传入加密串的话,plaint就是传入的字符串 if len(os.Args) > 1 { plaintext = []byte(os.Args[1]) } //aes的加密字符串 key_text := "astaxie12798akljzmknm.ahkjkljl;k" if len(os.Args) > 2 { key_text = os.Args[2] } fmt.Println(len(key_text)) // 创建加密算法aes c, err := aes.NewCipher([]byte(key_text)) if err != nil { fmt.Printf("Error: NewCipher(%d bytes) = %s", len(key_text), err) os.Exit(-1) } //加密字符串 cfb := cipher.NewCFBEncrypter(c, commonIV) ciphertext := make([]byte, len(plaintext)) cfb.XORKeyStream(ciphertext, plaintext) fmt.Printf("%s=>%x\n", plaintext, ciphertext) // 解密字符串 cfbdec := cipher.NewCFBDecrypter(c, commonIV) plaintextCopy := make([]byte, len(plaintext)) cfbdec.XORKeyStream(plaintextCopy, ciphertext) fmt.Printf("%x=>%s\n", ciphertext, plaintextCopy) }其运行结果如下:
D:\code>go run main.go
32
My name is Astaxie=>5072eadc20720cdb321b7c62947982d8227d
5072eadc20720cdb321b7c62947982d8227d=>My name is Astaxie
package main import ( "crypto/aes" "crypto/cipher" "crypto/rand" "encoding/hex" "fmt" "io" ) func ExampleNewCFBDecrypter() { key, _ := hex.DecodeString("6368616e676520746869732070617373") ciphertext, _ := hex.DecodeString("52869b03d72f01f4eccad3b3712e03f95caa4095d4269775a3cd6d9d52638b") block, err := aes.NewCipher(key) if err != nil { panic(err) } if len(ciphertext) < aes.BlockSize { panic("ciphertext too short") } iv := ciphertext[:aes.BlockSize] ciphertext = ciphertext[aes.BlockSize:] stream := cipher.NewCFBDecrypter(block, iv) stream.XORKeyStream(ciphertext, ciphertext) fmt.Printf("%s\n", ciphertext) } func ExampleNewCFBEncrypter() { key, _ := hex.DecodeString("6368616e676520746869732070617373") plaintext := []byte("c.biancheng.net") block, err := aes.NewCipher(key) if err != nil { panic(err) } ciphertext := make([]byte, aes.BlockSize+len(plaintext)) iv := ciphertext[:aes.BlockSize] if _, err := io.ReadFull(rand.Reader, iv); err != nil { panic(err) } stream := cipher.NewCFBEncrypter(block, iv) stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext) fmt.Printf("%x\n", ciphertext) } func main() { ExampleNewCFBDecrypter() ExampleNewCFBEncrypter() }
RSA 加解密
AES 一般用于加解密文,而 RSA 算法一算用来加解密密码。这里列举一个代码示例,如下:package main import ( "crypto/rand" "crypto/rsa" "crypto/x509" "encoding/base64" "encoding/pem" "errors" "fmt" ) // 可通过openssl产生 //openssl genrsa -out rsa_private_key.pem 1024 var privateKey = []byte(` -----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQDfw1/P15GQzGGYvNwVmXIGGxea8Pb2wJcF7ZW7tmFdLSjOItn9 kvUsbQgS5yxx+f2sAv1ocxbPTsFdRc6yUTJdeQolDOkEzNP0B8XKm+Lxy4giwwR5 LJQTANkqe4w/d9u129bRhTu/SUzSUIr65zZ/s6TUGQD6QzKY1Y8xS+FoQQIDAQAB AoGAbSNg7wHomORm0dWDzvEpwTqjl8nh2tZyksyf1I+PC6BEH8613k04UfPYFUg1 F2rUaOfr7s6q+BwxaqPtz+NPUotMjeVrEmmYM4rrYkrnd0lRiAxmkQUBlLrCBiF u+bluDkHXF7+TUfJm4AZAvbtR2wO5DUAOZ244FfJueYyZHECQQD+V5/WrgKkBlYy XhioQBXff7TLCrmMlUziJcQ295kIn8n1GaKzunJkhreoMbiRe0hpIIgPYb9E57tT /mP/MoYtAkEA4Ti6XiOXgxzV5gcB+fhJyb8PJCVkgP2wg0OQp2DKPp+5xsmRuUXv oExv92jv6X65x631VGjDmfJNb99wq5QJBAMSHUKrBqqizfMdOjh7z5fLc6wY5 M0a91rqoFAWlLErNrXAGbwIRf3LN5fvA76z6ZelViczY6sKDjOxKFVqL38ECQG0S pxdOT2M9BM45GJjxyPJ+qBuOTGU391Mq1pRpCKlZe4QtPHioyTGAAMd4Z/FX2MKb in48c0UX5t3VjPsmY0CQQCc1jmEoB83JmTHYByvDpc8kzsD8+GmiPVrausrjj4p y2DQpGmUic2zqCxl6qXMpBGtFEhrUbKhOiVOJbRNGvWW -----END RSA PRIVATE KEY----- `) //openssl //openssl rsa -in rsa_private_key.pem -pubout -out rsa_public_key.pem var publicKey = []byte(` -----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfw1/P15GQzGGYvNwVmXIGGxea Pb2wJcF7ZW7tmFdLSjOItn9kvUsbQgS5yxx+f2sAv1ocxbPTsFdRc6yUTJdeQol DOkEzNP0B8XKm+Lxy4giwwR5LJQTANkqe4w/d9u129bRhTu/SUzSUIr65zZ/s6TU GQD6QzKY1Y8xS+FoQQIDAQAB -----END PUBLIC KEY----- `) // 加密 func RsaEncrypt(origData []byte) ([]byte, error) { //解密pem格式的公钥 block, _ := pem.Decode(publicKey) 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 return rsa.EncryptPKCS1v15(rand.Reader, pub, origData) } // 解密 func RsaDecrypt(ciphertext []byte) ([]byte, error) { //解密 block, _ := pem.Decode(privateKey) 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 return rsa.DecryptPKCS1v15(rand.Reader, priv, ciphertext) } func main() { data, _ := RsaEncrypt([]byte("hello world")) fmt.Println(base64.StdEncoding.EncodeToString(data)) origData, _ := RsaDecrypt(data) fmt.Println(string(origData)) }运行结果如下:
D:\code>go run main.go
ocYqyhRtngT/G9TteTHxAmg9E3KNuw0zskKXcQbxeWEwFoHzGGIrfkDokq+SMvYeQjVCWTADBL3zzlelBBaZIVaJ11PndffC+
2AlDVhLrvRqy5MeEYFafH40ZH1qUptt/UiY4imgaQc1dhcQol0+4dTfGmgN8CMAi3od7AU+/RM=
hello world
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