106 lines
2.7 KiB
Go
106 lines
2.7 KiB
Go
package crypto
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import (
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"bytes"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"github.com/tjfoc/gmsm/sm3"
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"github.com/tjfoc/gmsm/sm4"
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)
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// SM4ECBEncrypt SM4-ECB模式加密
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func SM4ECBEncrypt(plaintext []byte, key []byte) (string, error) {
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if len(key) != 16 {
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return "", fmt.Errorf("SM4密钥长度必须为16字节")
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}
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block, err := sm4.NewCipher(key)
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if err != nil {
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return "", fmt.Errorf("创建SM4 cipher失败: %v", err)
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}
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padded := pkcs7Padding(plaintext, block.BlockSize())
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ciphertext := make([]byte, len(padded))
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for i := 0; i < len(padded); i += block.BlockSize() {
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block.Encrypt(ciphertext[i:i+block.BlockSize()], padded[i:i+block.BlockSize()])
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}
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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// SM4ECBDecrypt SM4-ECB模式解密
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func SM4ECBDecrypt(encryptedData string, key []byte) ([]byte, error) {
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if len(key) != 16 {
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return nil, fmt.Errorf("SM4密钥长度必须为16字节")
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}
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ciphertext, err := base64.StdEncoding.DecodeString(encryptedData)
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if err != nil {
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return nil, fmt.Errorf("base64解码失败: %v", err)
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}
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block, err := sm4.NewCipher(key)
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if err != nil {
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return nil, fmt.Errorf("创建SM4 cipher失败: %v", err)
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}
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blockSize := block.BlockSize()
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if len(ciphertext)%blockSize != 0 {
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return nil, fmt.Errorf("密文长度不是块大小的整数倍")
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}
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plaintext := make([]byte, len(ciphertext))
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for i := 0; i < len(ciphertext); i += blockSize {
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block.Decrypt(plaintext[i:i+blockSize], ciphertext[i:i+blockSize])
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}
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plaintext, err = pkcs7UnPadding(plaintext)
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if err != nil {
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return nil, fmt.Errorf("去除填充失败: %v", err)
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}
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return plaintext, nil
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}
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// SM3WithSalt 带盐的SM3哈希计算
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// 对应Java的 SmUtil.sm3WithSalt(saltBytes).digestHex(data)
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// 实现方式：SM3(salt + data)，输出十六进制字符串
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func SM3WithSalt(data string, salt string) string {
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h := sm3.New()
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h.Write([]byte(salt))
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h.Write([]byte(data))
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return hex.EncodeToString(h.Sum(nil))
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}
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// SM3Hash 计算SM3哈希值
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func SM3Hash(data []byte) string {
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return hex.EncodeToString(sm3.Sm3Sum(data))
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}
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// pkcs7Padding PKCS7填充
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func pkcs7Padding(data []byte, blockSize int) []byte {
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padding := blockSize - len(data)%blockSize
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padText := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(data, padText...)
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}
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// pkcs7UnPadding 去除PKCS7填充
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func pkcs7UnPadding(data []byte) ([]byte, error) {
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length := len(data)
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if length == 0 {
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return nil, fmt.Errorf("数据为空")
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}
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padding := int(data[length-1])
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if padding > length || padding == 0 {
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return nil, fmt.Errorf("无效的填充")
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}
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for i := length - padding; i < length; i++ {
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if data[i] != byte(padding) {
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return nil, fmt.Errorf("无效的填充")
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}
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}
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return data[:length-padding], nil
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} |