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72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
package crypt
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import (
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"bytes"
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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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// legacyIV is the static IV used by the legacy CBC encryption.
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// Deprecated: This is kept only for backward compatibility with existing encrypted data.
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var legacyIV = []byte{10, 22, 13, 79, 05, 8, 52, 91, 87, 98, 88, 98, 35, 25, 13, 05}
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// LegacyEncrypt encrypts plaintext using AES-CBC with a static IV.
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// Deprecated: Use Encrypt instead. This method is kept only for backward compatibility.
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func (f *FieldEncrypt) LegacyEncrypt(plaintext string) string {
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padded := pkcs5Padding([]byte(plaintext))
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ciphertext := make([]byte, len(padded))
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cbc := cipher.NewCBCEncrypter(f.block, legacyIV)
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cbc.CryptBlocks(ciphertext, padded)
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return base64.StdEncoding.EncodeToString(ciphertext)
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}
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// LegacyDecrypt decrypts ciphertext that was encrypted using AES-CBC with a static IV.
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// Deprecated: This method is kept only for backward compatibility with existing encrypted data.
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func (f *FieldEncrypt) LegacyDecrypt(ciphertext string) (string, error) {
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data, err := base64.StdEncoding.DecodeString(ciphertext)
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if err != nil {
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return "", fmt.Errorf("decode ciphertext: %w", err)
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}
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cbc := cipher.NewCBCDecrypter(f.block, legacyIV)
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cbc.CryptBlocks(data, data)
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plaintext, err := pkcs5UnPadding(data)
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if err != nil {
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return "", fmt.Errorf("unpad plaintext: %w", err)
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}
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return string(plaintext), nil
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}
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// pkcs5Padding adds PKCS#5 padding to the input.
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func pkcs5Padding(data []byte) []byte {
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padding := aes.BlockSize - len(data)%aes.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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// pkcs5UnPadding removes PKCS#5 padding from the input.
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func pkcs5UnPadding(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("input data is empty")
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}
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paddingLen := int(data[length-1])
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if paddingLen == 0 || paddingLen > aes.BlockSize || paddingLen > length {
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return nil, fmt.Errorf("invalid padding size")
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}
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// Verify that all padding bytes are the same
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for i := 0; i < paddingLen; i++ {
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if data[length-1-i] != byte(paddingLen) {
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return nil, fmt.Errorf("invalid padding")
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}
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}
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return data[:length-paddingLen], nil
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}
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