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GeezerVison is showing github.com — algorithms/cryptography/aes/aes.go at main · microwind/algorithms Expand file tree/ Copy pathaes.goMore file actions 123 lines (99 loc) · 2.67 KB / Copy pathaes.goFile metadata and controls123 lines (99 loc) · 2.67 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 package main import ( "crypto/aes" "crypto/cipher" "crypto/rand" "encoding/base64" "fmt" "io" ) // PKCS7填充 func pkcs7Pad(data []byte, blockSize int) []byte { padding := blockSize - len(data)%blockSize padtext := make([]byte, padding) for i := range padtext { padtext[i] = byte(padding) } return append(data, padtext...) } func pkcs7Unpad(data []byte, blockSize int) ([]byte, error) { if len(data) == 0 { return nil, fmt.Errorf("pkcs7: data is empty") } if len(data)%blockSize != 0 { return nil, fmt.Errorf("pkcs7: data is not block-aligned") } padding := int(data[len(data)-1]) if padding < 1 || padding > blockSize { return nil, fmt.Errorf("pkcs7: invalid padding") } // 检查padding是否正确 for i := len(data) - padding; i < len(data); i++ { if data[i] != byte(padding) { return nil, fmt.Errorf("pkcs7: invalid padding") } } return data[:len(data)-padding], nil } func encrypt(plainText, key string) (string, error) { keyBytes := []byte(key) plainBytes := []byte(plainText) block, err := aes.NewCipher(keyBytes) if err != nil { return "", err } // 使用PKCS7填充 plainBytes = pkcs7Pad(plainBytes, aes.BlockSize) // 创建加密器 ciphertext := make([]byte, aes.BlockSize+len(plainBytes)) iv := ciphertext[:aes.BlockSize] if _, err := io.ReadFull(rand.Reader, iv); err != nil { return "", err } mode := cipher.NewCBCEncrypter(block, iv) mode.CryptBlocks(ciphertext[aes.BlockSize:], plainBytes) return base64.StdEncoding.EncodeToString(ciphertext), nil } func decrypt(encryptedText, key string) (string, error) { keyBytes := []byte(key) ciphertext, err := base64.StdEncoding.DecodeString(encryptedText) if err != nil { return "", err } block, err := aes.NewCipher(keyBytes) if err != nil { return "", err } if len(ciphertext) < aes.BlockSize { return "", fmt.Errorf("ciphertext too short") } iv := ciphertext[:aes.BlockSize] ciphertext = ciphertext[aes.BlockSize:] // 创建解密器 mode := cipher.NewCBCDecrypter(block, iv) mode.CryptBlocks(ciphertext, ciphertext) // 移除PKCS7填充 plainBytes, err := pkcs7Unpad(ciphertext, aes.BlockSize) if err != nil { return "", err } return string(plainBytes), nil } func main() { plainText := "Hello, World!" key := "1234567890123456" // 16字节密钥 fmt.Printf("原文: %s\n", plainText) encrypted, err := encrypt(plainText, key) if err != nil { fmt.Printf("加密失败: %v\n", err) return } fmt.Printf("加密后: %s\n", encrypted) decrypted, err := decrypt(encrypted, key) if err != nil { fmt.Printf("解密失败: %v\n", err) return } fmt.Printf("解密后: %s\n", decrypted) fmt.Printf("验证: %t\n", plainText == decrypted) } |
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