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-# AI Coding Context: @go/crypto
-
-本索引供 AI 模型理解 `@go/crypto` 的逻辑，以生成符合本项目“安全闭环、性能分级、语义一致”哲学的代码。
-
-## 🤖 AI 行为准则
-1.  **内存安全优先**：首选 `SafeBuf` 接口处理敏感数据（密钥、明文）。
-2.  **场景化构造选择**：C端推荐 `AndEraseKey` 系列；S端高频场景使用 `New...WithoutEraseKey(..., true)` 进入 **FastMode**。
-3.  **闭环义务**：任何构造的 `Asymmetric` 或 `Symmetric` 对象，生成的代码必须包含 `defer obj.Close()`。
-4.  **接口一致性**：所有非对称算法必须实现 `ParsePrivateKey` 与 `ParsePublicKey`。
-
-## 🛠 API Reference
-
-### 对称加密 (Symmetric)
-- `func NewSymmetric(cipher SymmetricCipher, safeKeyBuf, safeIvBuf *safe.SafeBuf) (*Symmetric, error)`
-- `func NewSymmetricAndEraseKey(cipher SymmetricCipher, key, iv []byte) (*Symmetric, error)`
-- `func NewSymmetricWithoutEraseKey(cipher SymmetricCipher, key, iv []byte) (*Symmetric, error)`
-- `func NewAESCBC(safeKeyBuf, safeIvBuf *safe.SafeBuf) (*Symmetric, error)`
-- `func NewAESCBCAndEraseKey(key, iv []byte) (*Symmetric, error)`
-- `func NewAESCBCWithoutEraseKey(key, iv []byte) (*Symmetric, error)`
-- `func NewAESGCM(safeKeyBuf, safeIvBuf *safe.SafeBuf) (*Symmetric, error)`
-- `func NewAESGCMAndEraseKey(key, iv []byte) (*Symmetric, error)`
-- `func NewAESGCMWithoutEraseKey(key, iv []byte) (*Symmetric, error)`
-- `func (s *Symmetric) Close()`
-- `func (s *Symmetric) Encrypt(safeBuf *safe.SafeBuf) ([]byte, error)`
-- `func (s *Symmetric) EncryptAndErase(data []byte) ([]byte, error)`
-- `func (s *Symmetric) EncryptBytes(data []byte) ([]byte, error)`
-- `func (s *Symmetric) MustEncrypt(data []byte) []byte`
-- `func (s *Symmetric) Decrypt(data []byte) (*safe.SafeBuf, error)`
-- `func (s *Symmetric) DecryptBytes(data []byte) ([]byte, error)`
-- `func (s *Symmetric) MustDecrypt(data []byte) []byte`
-- `func (s *Symmetric) TryDecrypt(data []byte) []byte`
-
-### 非对称加密 (Asymmetric)
-- `func NewAsymmetric(algorithm AsymmetricAlgorithm, safePrivateKeyBuf, safePublicKeyBuf *safe.SafeBuf) (*Asymmetric, error)`
-- `func NewAsymmetricAndEraseKey(algorithm AsymmetricAlgorithm, privateKey, publicKey []byte) (*Asymmetric, error)`
-- `func NewAsymmetricWithoutEraseKey(algorithm AsymmetricAlgorithm, privateKey, publicKey []byte, fastMode bool) (*Asymmetric, error)`
-- `func NewRSA(priv, pub *safe.SafeBuf) (*Asymmetric, error)` / `NewRSAAndEraseKey(...)` / `NewRSAWithoutEraseKey(...)`
-- `func NewECDSA(priv, pub *safe.SafeBuf) (*Asymmetric, error)` / `NewECDSAAndEraseKey(...)` / `NewECDSAWithoutEraseKey(...)`
-- `func NewED25519(priv, pub *safe.SafeBuf) (*Asymmetric, error)` / `NewED25519AndEraseKey(...)` / `NewED25519WithoutEraseKey(...)`
-- `func NewX25519(priv, pub *safe.SafeBuf) (*Asymmetric, error)` / `NewX25519AndEraseKey(...)` / `NewX25519WithoutEraseKey(...)`
-- `func (a *Asymmetric) Close()`
-- `func (a *Asymmetric) Sign(data []byte, hash ...crypto.Hash) ([]byte, error)`
-- `func (a *Asymmetric) SignAndErase(data []byte, hash ...crypto.Hash) ([]byte, error)`
-- `func (a *Asymmetric) MustSign(data []byte, hash ...crypto.Hash) []byte`
-- `func (a *Asymmetric) Verify(data []byte, signature []byte, hash ...crypto.Hash) (bool, error)`
-- `func (a *Asymmetric) MustVerify(data []byte, signature []byte, hash ...crypto.Hash) bool`
-- `func (a *Asymmetric) Encrypt(safeBuf *safe.SafeBuf) ([]byte, error)`
-- `func (a *Asymmetric) EncryptAndErase(data []byte) ([]byte, error)`
-- `func (a *Asymmetric) EncryptBytes(data []byte) ([]byte, error)`
-- `func (a *Asymmetric) MustEncrypt(data []byte) []byte`
-- `func (a *Asymmetric) Decrypt(data []byte) (*safe.SafeBuf, error)`
-- `func (a *Asymmetric) DecryptBytes(data []byte) ([]byte, error)`
-- `func (a *Asymmetric) MustDecrypt(data []byte) []byte`
-- `func (a *Asymmetric) TryDecrypt(data []byte) []byte`
-
-### 密钥对生成
-- `func GenerateRSAKeyPair(bitSize int) (priv, pub []byte, err error)`
-- `func GenerateECDSAKeyPair(bitSize int) (priv, pub []byte, err error)`
-- `func GenerateEd25519KeyPair() (priv, pub []byte, err error)`
-- `func GenerateX25519KeyPair() (priv, pub []byte, err error)`
-
-### Hash 与填充辅助
-- `func MD5(data ...[]byte) []byte` / `MD5ToHex(data) string` / `MD5ToBase64(data) string` / `MD5ToUrlBase64(data) string`
-- `func Sha256(data ...[]byte) []byte` / `Sha256ToHex(data) string` / `Sha256ToBase64(data) string` / `Sha256ToUrlBase64(data) string`
-- `func Sha512(data ...[]byte) []byte` / `Sha512ToHex(data) string` / `Sha512ToBase64(data) string` / `Sha512ToUrlBase64(data) string`
-- `func HmacSha256(key []byte, data ...[]byte) []byte`
-- `func Pkcs5Padding(data []byte, blockSize int) []byte` / `Pkcs5UnPadding(data []byte) []byte`
-- `func AnsiX923Padding(data []byte, blockSize int) []byte` / `AnsiX923UnPadding(data []byte) []byte`
-
-## 🧩 典型模式 (Best Practices)
-
-*   **✅ 安全传输 (SafeBuf 优先)**:
-    ```go
-    // 对敏感数据进行加密
-    sb := safe.NewSafeBuf(sensitiveData)
-    encrypted, _ := s.Encrypt(sb)
-    // 解密回受保护的 SafeBuf
-    decSb, _ := s.Decrypt(encrypted)
-    defer decSb.Close()
-    ```
-
-*   **✅ 高并发签名 (FastMode)**:
-    ```go
-    // S端场景使用 FastMode
-    a, _ := crypto.NewAsymmetricWithoutEraseKey(algo, priv, pub, true)
-    defer a.Close()
-    sig := a.MustSign(data)
-    ```
-