init

crypto/aes/aes.go

@@ -0,0 +1,104 @@
+package aes
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/base64"
+)
+
+// AES加密
+func Encrypt(key string, iv string, data string) string {
+	if len(data) == 0 {
+		return ""
+	}
+	key2, _ := base64.StdEncoding.DecodeString(key)
+	iv2, _ := base64.StdEncoding.DecodeString(iv)
+
+	block, _ := aes.NewCipher(key2)
+	bs := block.BlockSize()
+	originData := _PKCS5Padding([]byte(data), bs)
+	cipher.NewCBCEncrypter(block, iv2).CryptBlocks(originData, originData)
+
+	data = base64.StdEncoding.EncodeToString(originData)
+	return data
+}
+
+// AES解密
+func Decrypt(key string, iv string, data string) string {
+	if len(data) == 0 {
+		return ""
+	}
+	key2, _ := base64.StdEncoding.DecodeString(key)
+	iv2, _ := base64.StdEncoding.DecodeString(iv)
+
+	block, _ := aes.NewCipher(key2)
+	originData, err := base64.StdEncoding.DecodeString(data)
+	if err != nil {
+		return ""
+	}
+	cipher.NewCBCDecrypter(block, iv2).CryptBlocks(originData, originData)
+
+	data = string(_PKCS5UnPadding(originData))
+	return data
+}
+
+func _PKCS5Padding(cipherText []byte, blockSize int) []byte {
+	padding := blockSize - len(cipherText)%blockSize
+	padText := bytes.Repeat([]byte{byte(padding)}, padding)
+	return append(cipherText, padText...)
+}
+func _PKCS5UnPadding(origData []byte) []byte {
+	length := len(origData)
+	unpadding := int(origData[length-1])
+	if length-unpadding < 0 {
+		return origData
+	}
+	return origData[:(length - unpadding)]
+}
+
+// =================== ECB ======================
+func AesEncryptECB(origData []byte, key []byte) (data string) {
+	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])
+	}
+
+	data = base64.StdEncoding.EncodeToString(encrypted)
+	return data
+}
+func AesDecryptECB(encrypted string, key []byte) (decrypted []byte) {
+	decodedCiphertext, _ := base64.StdEncoding.DecodeString(encrypted)
+	cipher, _ := aes.NewCipher(generateKey(key))
+	decrypted = make([]byte, len(decodedCiphertext))
+	//
+	for bs, be := 0, cipher.BlockSize(); bs < len(decodedCiphertext); bs, be = bs+cipher.BlockSize(), be+cipher.BlockSize() {
+		cipher.Decrypt(decrypted[bs:be], decodedCiphertext[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
+}