47 lines
982 B
Go
47 lines
982 B
Go
package helper
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/sha256"
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"encoding/base64"
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"log"
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lzstring "github.com/daku10/go-lz-string"
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)
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func StringDecrypt(key string, encryptedString string) (string, error) {
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keyHash := sha256.Sum256([]byte(key))
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keyHashBytes := keyHash[:]
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iv := keyHashBytes[:16]
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encryptedBytes, err := base64.StdEncoding.DecodeString(encryptedString)
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if err != nil {
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return "", err
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}
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block, err := aes.NewCipher(keyHashBytes)
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if err != nil {
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return "", err
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}
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mode := cipher.NewCBCDecrypter(block, iv)
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decrypted := make([]byte, len(encryptedBytes))
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mode.CryptBlocks(decrypted, encryptedBytes)
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decrypted = RemovePKCS7Padding(decrypted)
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dataResp, err := lzstring.DecompressFromEncodedURIComponent(string(decrypted))
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if err != nil {
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log.Fatalf("Error decompress: %v", err)
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}
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return dataResp, nil
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}
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func RemovePKCS7Padding(data []byte) []byte {
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paddingLength := int(data[len(data)-1])
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return data[:len(data)-paddingLength]
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}
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