go CBC 加密【AES 和DES的运用】
关于AES cbc的加密 在go AES 加密 和解密已经调到了， 这次主要涉及的内同时cbc 和ecb，刚好网上也有相应的说明， 我就一起整理一下
DES是以64比特的明文为一个单位来进行加密，并生成64比特的密文。由于它每次只能处理特定长度的一块数据，所以DES属于分组密码算法。cypto/des包提供了有关des加密的功能。
在线测试工具进行测试，看结果是否一致。
一定要注意DES CBC的key长度为8， AES CBC 的key 为16，24,32
package utils import ( "bytes" "crypto/aes" "crypto/cipher" "crypto/des" "encoding/hex" "fmt" ) /* DES CBC加密 key的长度为8个字节， iv必须相同长度 */ func EncryptDES_CBC(src, key, iv string) string { data := []byte(src) keyByte := []byte(key) block, err := des.NewCipher(keyByte) if err != nil { panic(err) } data = PKCS5Padding(data, block.BlockSize()) //获取CBC加密模式 //iv := keyByte //用密钥作为向量(不建议这样使用) ivByte := []byte(iv) mode := cipher.NewCBCEncrypter(block, ivByte) out := make([]byte, len(data)) mode.CryptBlocks(out, data) return fmt.Sprintf("%X", out) } //DESC CBC解密 func DecryptDES_CBC(src, key, iv string) string { keyByte := []byte(key) data, err := hex.DecodeString(src) if err != nil { panic(err) } block, err := des.NewCipher(keyByte) if err != nil { panic(err) } ivBye := []byte(iv) mode := cipher.NewCBCDecrypter(block, ivBye) plaintext := make([]byte, len(data)) mode.CryptBlocks(plaintext, data) plaintext = PKCS5UnPadding(plaintext) return string(plaintext) } //ECB加密 func EncryptDES_ECB(src, key string) string { data := []byte(src) keyByte := []byte(key) block, err := des.NewCipher(keyByte) if err != nil { panic(err) } bs := block.BlockSize() //对明文数据进行补码 data = PKCS5Padding(data, bs) if len(data)%bs != 0 { panic("Need a multiple of the blocksize") } out := make([]byte, len(data)) dst := out for len(data) > 0 { //对明文按照blocksize进行分块加密 //必要时可以使用go关键字进行并行加密 block.Encrypt(dst, data[:bs]) data = data[bs:] dst = dst[bs:] } return fmt.Sprintf("%X", out) } //ECB解密 func DecryptDES_ECB(src, key string) string { data, err := hex.DecodeString(src) if err != nil { panic(err) } keyByte := []byte(key) block, err := des.NewCipher(keyByte) if err != nil { panic(err) } bs := block.BlockSize() if len(data)%bs != 0 { panic("crypto/cipher: input not full blocks") } out := make([]byte, len(data)) dst := out for len(data) > 0 { block.Decrypt(dst, data[:bs]) data = data[bs:] dst = dst[bs:] } out = PKCS5UnPadding(out) return string(out) } /* key参数的长度 iv必须相同长度 16 字节 - AES-128 24 字节 - AES-192 32 字节 - AES-256 */ func EncryptAES_CBC(src, key, iv string) string { data := []byte(src) keyByte := []byte(key) block, err := aes.NewCipher(keyByte) if err != nil { panic(err) } data = PKCS5Padding(data, block.BlockSize()) //获取CBC加密模式 //iv := keyByte //用密钥作为向量(不建议这样使用) ivByte := []byte(iv) mode := cipher.NewCBCEncrypter(block, ivByte) out := make([]byte, len(data)) mode.CryptBlocks(out, data) return fmt.Sprintf("%X", out) } //AES CBC解密 func DecryptAES_CBC(src, key, iv string) string { keyByte := []byte(key) data, err := hex.DecodeString(src) if err != nil { panic(err) } block, err := aes.NewCipher(keyByte) if err != nil { panic(err) } //iv := keyByte //用密钥作为向量(不建议这样使用) ivBye := []byte(iv) mode := cipher.NewCBCDecrypter(block, ivBye) plaintext := make([]byte, len(data)) mode.CryptBlocks(plaintext, data) plaintext = PKCS5UnPadding(plaintext) return string(plaintext) } //明文补码算法 func PKCS5Padding(ciphertext []byte, blockSize int) []byte { padding := blockSize - len(ciphertext)%blockSize padtext := bytes.Repeat([]byte{byte(padding)}, padding) return append(ciphertext, padtext...) } //明文减码算法 func PKCS5UnPadding(origData []byte) []byte { length := len(origData) unpadding := int(origData[length-1]) return origData[:(length - unpadding)] }
第三方包
github.com/marspere/goencrypt包实现了多种加密算法，包括对称加密和非对称加密等。
package main import ( "fmt" "github.com/marspere/goencrypt" ) func main() { // key为12345678 // iv为空 // 采用ECB分组模式 // 采用pkcs7padding填充模式 // 输出结果使用base64进行加密 cipher := goencrypt.NewDESCipher([]byte("12345678"), []byte(""), goencrypt.ECBMode, goencrypt.Pkcs7, goencrypt.PrintBase64) cipherText, err := cipher.DESEncrypt([]byte("hello world")) if err != nil { fmt.Println(err) return } fmt.Println(cipherText) plainText, err := cipher.DESDecrypt(cipherText) fmt.Println(plainText) }
---------------------2021-4-21-------------
import ( "bytes" "crypto/aes" "crypto/cipher" ) // PKCS7加填充/和PKCS5填充一样,只是填充字段多少的区别 func PKCS7Padding(cipherText []byte, blockSize int) []byte { padding := blockSize - len(cipherText)%blockSize padText := bytes.Repeat([]byte{byte(padding)}, padding) return append(cipherText, padText...) } // PKCS7解填充/和PKCS5填充一样,只是填充字段多少的区别 func PKCS7UnPadding(encrypt []byte) []byte { length := len(encrypt) unPadding := int(encrypt[length-1]) return encrypt[:(length - unPadding)] } // AES/ECB/PKCS7模式加密--签名加密方式 func AesECBEncrypt(data, key []byte) ([]byte, error) { block, err := aes.NewCipher(key) if err != nil { return []byte{}, err } ecb := NewECBEncryptEr(block) // 加PKCS7填充 content := PKCS7Padding(data, block.BlockSize()) encryptData := make([]byte, len(content)) // 生成加密数据 ecb.CryptBlocks(encryptData, content) return encryptData, nil } // AES/ECB/PKCS7模式解密--签名解密方式 func AesECBDecrypt(data, key []byte) ([]byte, error) { block, err := aes.NewCipher(key) if err != nil { return []byte{}, err } ecb := NewECBDecryptEr(block) retData := make([]byte, len(data)) ecb.CryptBlocks(retData, data) // 解PKCS7填充 retData = PKCS7UnPadding(retData) return retData, nil } type ecb struct { b cipher.Block blockSize int } func newECB(b cipher.Block) *ecb { return &ecb{ b: b, blockSize: b.BlockSize(), } } type ecbEncryptEr ecb func NewECBEncryptEr(b cipher.Block) cipher.BlockMode { return (*ecbEncryptEr)(newECB(b)) } func (x *ecbEncryptEr) BlockSize() int { return x.blockSize } func (x *ecbEncryptEr) CryptBlocks(dst, src []byte) { if len(src)%x.blockSize != 0 { panic("crypto/cipher: input not full blocks") } if len(dst) < len(src) { panic("crypto/cipher: output smaller than input") } for len(src) > 0 { x.b.Encrypt(dst, src[:x.blockSize]) src = src[x.blockSize:] dst = dst[x.blockSize:] } } // ecb解密方法 type ecbDecryptEr ecb func NewECBDecryptEr(b cipher.Block) cipher.BlockMode { return (*ecbDecryptEr)(newECB(b)) } func (x *ecbDecryptEr) BlockSize() int { return x.blockSize } func (x *ecbDecryptEr) CryptBlocks(dst, src []byte) { if len(src)%x.blockSize != 0 { panic("crypto/cipher: input not full blocks") } if len(dst) < len(src) { panic("crypto/cipher: output smaller than input") } for len(src) > 0 { x.b.Decrypt(dst, src[:x.blockSize]) src = src[x.blockSize:] dst = dst[x.blockSize:] } }
java实现：
public static String encode(String reqstr, String reqkey) throws Exception { Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC"); SecretKeySpec keySpec = new SecretKeySpec(reqkey.getBytes("UTF-8"), "AES"); cipher.init(1, keySpec); byte[] result = cipher.doFinal(reqstr.getBytes("UTF-8")); return new String(Base64.encode(result)); } public static String decodeByAES(String reskey, String resstr) throws Exception { byte[] responseByte = Base64.decode(resstr); Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC"); SecretKeySpec keySpec = new SecretKeySpec(hex2bytes(reskey), "AES"); cipher.init(2, keySpec); byte[] decoded = cipher.doFinal(responseByte); return new String(decoded, "UTF-8"); }