60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
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package utils
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/hmac"
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"crypto/md5"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"io"
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)
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func GeneratePassphrase(key string) string {
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hash := md5.New()
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hash.Write([]byte(key))
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return hex.EncodeToString(hash.Sum(nil))
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}
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func HashWithPassphrase(data []byte, key string) string {
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h := hmac.New(sha256.New, []byte(key))
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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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func ASCEncrypt(data []byte, passphrase string) (string, error) {
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block, _ := aes.NewCipher([]byte(GeneratePassphrase(passphrase)))
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, gcm.NonceSize())
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if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
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return "", err
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}
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ciphertext := gcm.Seal(nonce, nonce, data, nil)
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return base64.StdEncoding.EncodeToString(ciphertext), nil
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}
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func ASCDecrypt(msg, passphrase string) (string, error) {
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data, err := base64.StdEncoding.DecodeString(msg)
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key := []byte(GeneratePassphrase(passphrase))
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonceSize := gcm.NonceSize()
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nonce, ciphertext := data[:nonceSize], data[nonceSize:]
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plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
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if err != nil {
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return "", err
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}
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return string(plaintext), nil
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}
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