我应该在rsa_pub_enc和rsa_pub_dec OpenSSL函数中使用什么？

我编写了一些OpenSSL引擎。 它使用帮助硬件实现其他RSA实现

OpenSSL具有函数

ENGINE\u set\u RSA（ENGINE*e，const RSA\u METHOD*RSA\u meth）。有了HelpOne，我可以设置新的实现。
类型
RSA\u方法
包含实现的指针

struct rsa_meth_st {
    const char *name;
    int (*rsa_pub_enc) (int flen, const unsigned char *from,
                        unsigned char *to, RSA *rsa, int padding);
    int (*rsa_pub_dec) (int flen, const unsigned char *from,
                        unsigned char *to, RSA *rsa, int padding);
    int (*rsa_priv_enc) (int flen, const unsigned char *from,
                         unsigned char *to, RSA *rsa, int padding);
    int (*rsa_priv_dec) (int flen, const unsigned char *from,
                         unsigned char *to, RSA *rsa, int padding);
    /* Can be null */
    int (*rsa_mod_exp) (BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);
    /* Can be null */
    int (*bn_mod_exp) (BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
                       const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
    /* called at new */
    int (*init) (RSA *rsa);
    /* called at free */
    int (*finish) (RSA *rsa);
    /* RSA_METHOD_FLAG_* things */
    int flags;
    /* may be needed! */
    char *app_data;
    /*
     * New sign and verify functions: some libraries don't allow arbitrary
     * data to be signed/verified: this allows them to be used. Note: for
     * this to work the RSA_public_decrypt() and RSA_private_encrypt() should
     * *NOT* be used RSA_sign(), RSA_verify() should be used instead. Note:
     * for backwards compatibility this functionality is only enabled if the
     * RSA_FLAG_SIGN_VER option is set in 'flags'.
     */
    int (*rsa_sign) (int type,
                     const unsigned char *m, unsigned int m_length,
                     unsigned char *sigret, unsigned int *siglen,
                     const RSA *rsa);
    int (*rsa_verify) (int dtype, const unsigned char *m,
                       unsigned int m_length, const unsigned char *sigbuf,
                       unsigned int siglen, const RSA *rsa);
    /*
     * If this callback is NULL, the builtin software RSA key-gen will be
     * used. This is for behavioural compatibility whilst the code gets
     * rewired, but one day it would be nice to assume there are no such
     * things as "builtin software" implementations.
     */
    int (*rsa_keygen) (RSA *rsa, int bits, BIGNUM *e, BN_GENCB *cb);
};

我不明白应该怎么做
rsa\u pub\u enc
和
rsa\u pub\u dec
。
它应该只使用帮助公钥进行加密和解密吗

关于
rsa\u priv\u enc/rsa\u priv\u dec
，我也有同样的问题。
它应该只使用帮助私钥进行加密和解密吗

我已经读过了，但是我不明白

谁能给我解释一下吗？
加密/解密是这样进行的：

使用公钥加密-使用私钥解密（建议和标准方式）
或

使用私钥加密-使用公钥解密
设置1：您的
rsa\u pub\u enc
可以指向实现
rsa\u public\u encrypt
和
rsa\u private\u dec
可以指向
rsa\u private\u decrypt

Set 2：您的
rsa\u private\u enc
可以指向实现
rsa\u private\u encrypt
和
rsa\u pub\u dec
可以指向
rsa\u public\u decrypt

用户设置1，因为私钥总是安全的