33 lines
747 B
Go
33 lines
747 B
Go
package utils
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import (
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"crypto/aes"
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"crypto/cipher"
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"encoding/base64"
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"fmt"
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)
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func AesDecode(data string, key []byte) (string, error) {
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decoded, err := base64.StdEncoding.DecodeString(data)
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if err != nil {
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return "", fmt.Errorf("base64 decode error: %v", err)
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return "", fmt.Errorf("aes new cipher error: %v", err)
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}
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if len(decoded) < aes.BlockSize {
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return "", fmt.Errorf("ciphertext too short")
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}
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decrypted := make([]byte, len(decoded))
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mode := cipher.NewCBCDecrypter(block, make([]byte, aes.BlockSize))
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mode.CryptBlocks(decrypted, decoded)
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padding := decrypted[len(decrypted)-1]
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decrypted = decrypted[:len(decrypted)-int(padding)]
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return string(decrypted), nil
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}
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