first commit

clientsdk/android/aes.go

@@ -0,0 +1,172 @@
+package android
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"fmt"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func padding(src []byte, blocksize int) []byte {
+	padnum := blocksize - len(src)%blocksize
+	pad := bytes.Repeat([]byte{byte(padnum)}, padnum)
+	return append(src, pad...)
+}
+
+func unpadding(src []byte) []byte {
+	n := len(src)
+	unpadnum := int(src[n-1])
+	return src[:n-unpadnum]
+}
+
+func EncryptAES(src []byte, key []byte) []byte {
+	block, _ := aes.NewCipher(key)
+	src = padding(src, block.BlockSize())
+	blockmode := cipher.NewCBCEncrypter(block, key)
+	blockmode.CryptBlocks(src, src)
+	return src
+}
+
+func DecryptAES(src []byte, key []byte) []byte {
+	block, _ := aes.NewCipher(key)
+	blockmode := cipher.NewCBCDecrypter(block, key)
+	blockmode.CryptBlocks(src, src)
+	src = unpadding(src)
+	return src
+}
+
+func AESEncrypt(src []byte, key []byte) []byte {
+	block, _ := aes.NewCipher(key)
+	src = padding(src, block.BlockSize())
+	blockmode := cipher.NewCBCEncrypter(block, key)
+	blockmode.CryptBlocks(src, src)
+	return src
+}
+
+func AESDecrypt(src []byte, key []byte) []byte {
+	block, _ := aes.NewCipher(key)
+	blockmode := cipher.NewCBCDecrypter(block, key)
+	blockmode.CryptBlocks(src, src)
+	src = unpadding(src)
+	return src
+}
+
+func AesEncrypt(RequestSerialize []byte, key []byte) []byte {
+	//根据key 生成密文
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil
+	}
+
+	blockSize := block.BlockSize()
+	RequestSerialize = PKCS5Padding(RequestSerialize, blockSize)
+
+	blockMode := cipher.NewCBCEncrypter(block, key)
+	crypted := make([]byte, len(RequestSerialize))
+	blockMode.CryptBlocks(crypted, RequestSerialize)
+
+	return crypted
+}
+
+func AesDecrypt(body []byte, key []byte) []byte {
+	// fmt.Printf("%x\n\n", body)
+	// fmt.Printf("%x\n\n", key)
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil
+	}
+	blockMode := cipher.NewCBCDecrypter(block, key)
+	origData := make([]byte, len(body))
+	blockMode.CryptBlocks(origData, body)
+	origData = PKCS5UnPadding(origData)
+	// fmt.Printf("%x\n", origData)
+	return origData
+}
+
+// =================== ECB ======================
+func AesEncryptECB(origData []byte, key []byte) (encrypted []byte) {
+	cipher, _ := aes.NewCipher(generateKey(key))
+	length := (len(origData) + aes.BlockSize) / aes.BlockSize
+	plain := make([]byte, length*aes.BlockSize)
+	copy(plain, origData)
+	pad := byte(len(plain) - len(origData))
+	for i := len(origData); i < len(plain); i++ {
+		plain[i] = pad
+	}
+	encrypted = make([]byte, len(plain))
+	// 分组分块加密
+	for bs, be := 0, cipher.BlockSize(); bs <= len(origData); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
+		cipher.Encrypt(encrypted[bs:be], plain[bs:be])
+	}
+
+	return encrypted
+}
+
+func AesDecryptECB(encrypted []byte, key []byte) (decrypted []byte) {
+	cipher, _ := aes.NewCipher(generateKey(key))
+	decrypted = make([]byte, len(encrypted))
+	//
+	for bs, be := 0, cipher.BlockSize(); bs < len(encrypted); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
+		cipher.Decrypt(decrypted[bs:be], encrypted[bs:be])
+	}
+
+	trim := 0
+	if len(decrypted) > 0 {
+		trim = len(decrypted) - int(decrypted[len(decrypted)-1])
+	}
+
+	return decrypted[:trim]
+}
+func generateKey(key []byte) (genKey []byte) {
+	genKey = make([]byte, 16)
+	copy(genKey, key)
+	for i := 16; i < len(key); {
+		for j := 0; j < 16 && i < len(key); j, i = j+1, i+1 {
+			genKey[j] ^= key[i]
+		}
+	}
+	return genKey
+}
+
+func CompressAndAes(RequestSerialize []byte, aeskey []byte) []byte {
+	compressed := DoZlibCompress(RequestSerialize)
+	return AesEncrypt(compressed, aeskey)
+}
+
+func DecompressAndAesDecrypt(body []byte, key []byte) []byte {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil
+	}
+
+	if len(body)%aes.BlockSize != 0 {
+		log.Error(fmt.Sprintf("crypto/cipher: data is not a multiple of the block size，[BodyLength：%v] [AesLength：%v]", len(body), aes.BlockSize))
+		return nil
+	}
+
+	blockMode := cipher.NewCBCDecrypter(block, key)
+	origData := make([]byte, len(body))
+	blockMode.CryptBlocks(origData, body)
+	origData = PKCS5UnPadding(origData)
+	origData = DoZlibUnCompress(origData)
+	return origData
+}
+
+func PKCS5UnPadding(origData []byte) []byte {
+	length := len(origData)
+	unpadding := int(origData[length-1])
+	if length < unpadding {
+		return nil
+	}
+	return origData[:(length - unpadding)]
+}
+
+func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
+	padding := blockSize - len(ciphertext)%blockSize
+	//填充
+	padtext := bytes.Repeat([]byte{byte(padding)}, padding)
+
+	return append(ciphertext, padtext...)
+}