first commit

pkg/lzkit/crypto/crypto_url.go

@@ -0,0 +1,67 @@
+package crypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"encoding/base64"
+	"errors"
+	"io"
+)
+
+// AES CBC模式加密，Base64传入传出
+func AesEncryptURL(plainText, key []byte) (string, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return "", err
+	}
+	blockSize := block.BlockSize()
+	plainText = PKCS7Padding(plainText, blockSize)
+
+	cipherText := make([]byte, blockSize+len(plainText))
+	iv := cipherText[:blockSize] // 使用前blockSize字节作为IV
+	_, err = io.ReadFull(rand.Reader, iv)
+	if err != nil {
+		return "", err
+	}
+
+	mode := cipher.NewCBCEncrypter(block, iv)
+	mode.CryptBlocks(cipherText[blockSize:], plainText)
+
+	return base64.URLEncoding.EncodeToString(cipherText), nil
+}
+
+// AES CBC模式解密，Base64传入传出
+func AesDecryptURL(cipherTextBase64 string, key []byte) ([]byte, error) {
+	cipherText, err := base64.URLEncoding.DecodeString(cipherTextBase64)
+	if err != nil {
+		return nil, err
+	}
+
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	blockSize := block.BlockSize()
+	if len(cipherText) < blockSize {
+		return nil, errors.New("ciphertext too short")
+	}
+
+	iv := cipherText[:blockSize]
+	cipherText = cipherText[blockSize:]
+
+	if len(cipherText)%blockSize != 0 {
+		return nil, errors.New("ciphertext is not a multiple of the block size")
+	}
+
+	mode := cipher.NewCBCDecrypter(block, iv)
+	mode.CryptBlocks(cipherText, cipherText)
+
+	plainText, err := PKCS7UnPadding(cipherText)
+	if err != nil {
+		return nil, err
+	}
+
+	return plainText, nil
+}