java to Go AES/ECB/PKCS7Padding 加密

最新推荐文章于 2024-04-10 15:33:39 发布

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#go #加密解密 #java

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该博客详细介绍了如何将使用Java实现的AES/ECB/PKCS7Padding加密解密方法转换为Golang代码。内容包括PKCS7填充的实现、加密和解密的完整过程，以及在Golang中创建和使用ECB模式的加密解密器。

记录一次由JAVA 到 Golang的加密的转换

JAVA code

import javax.crypto.Cipher;

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");
}

Go code

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:]
   }
}