Question

我编写了一些OpenSSL引擎。它通过帮助硬件实现了其他RSA实现。

OpenSSL具有功能ENGINE_set_RSA(ENGINE *e, const RSA_METHOD *rsa_meth);。在帮助下，我可以设置新的实现。类型RSA_METHOD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);
};

我不知道rsa_pub_enc和rsa_pub_dec应该怎么做。是否应该仅借助帮助PUBlic密钥进行加密和解密？

我对rsa_priv_enc/rsa_priv_dec有相同的疑问。是否应该仅借助PRIVate密钥进行加密和解密？

我已经读过https://www.openssl.org/docs/manmaster/man3/RSA_public_encrypt.html和https://www.openssl.org/docs/man1.1.0/man3/RSA_public_decrypt.html，但我听不懂。

请问有人可以解释一下吗？

Answer 1

加密/解密以这种方式发生：

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_pub_enc可以指向RSA_public_encrypt的实现，而rsa_priv_dec可以指向RSA_private_decrypt

设置2 ：您的rsa_priv_enc可以指向RSA_private_encrypt的实现，而rsa_pub_dec可以指向RSA_public_decrypt

用户设置1 ，因为始终可以保护私钥安全

我应该对rsa_pub_enc和rsa_pub_dec OpenSSL函数使用什么？

1 个答案: