OPENSSL 小计

1. 用的函数必须匹配
获取公钥使用

i2d_RSAPublicKey

则更加公钥产生RSA使用配对的

d2i_RSAPublicKey

不能使用等等，如下例子

d2i_RSA_PUBKEY

2. 想知道其他函数
直接看头文件，比较方便

附录

i2d_rsapublickey(3) - Linux man page

Name

d2i_RSAPublicKey, i2d_RSAPublicKey, d2i_RSAPrivateKey, i2d_RSAPrivateKey, d2i_RSA_PUBKEY, i2d_RSA_PUBKEY, i2d_Netscape_RSA, d2i_Netscape_RSA - RSA public and private key encoding functions.

Synopsis

#include 
#include 

RSA * d2i_RSAPublicKey(RSA **a, const unsigned char **pp, long length);

int i2d_RSAPublicKey(RSA *a, unsigned char **pp);

RSA * d2i_RSA_PUBKEY(RSA **a, const unsigned char **pp, long length);

int i2d_RSA_PUBKEY(RSA *a, unsigned char **pp);

RSA * d2i_RSAPrivateKey(RSA **a, const unsigned char **pp, long length);

int i2d_RSAPrivateKey(RSA *a, unsigned char **pp);

int i2d_Netscape_RSA(RSA *a, unsigned char **pp, int (*cb)());

RSA * d2i_Netscape_RSA(RSA **a, const unsigned char **pp, long length, int (*cb)());

Description

d2i_RSAPublicKey() and i2d_RSAPublicKey() decode and encode a PKCS#1 RSAPublicKey structure.

d2i_RSA_PUBKEY() and i2d_RSA_PUBKEY() decode and encode an RSA public key using a SubjectPublicKeyInfo (certificate public key) structure.

d2i_RSAPrivateKey(), i2d_RSAPrivateKey() decode and encode a PKCS#1 RSAPrivateKey structure.

d2i_Netscape_RSA(), i2d_Netscape_RSA() decode and encode an RSA private key in NET format.

The usage of all of these functions is similar to the d2i_X509() and i2d_X509() described in the (3) manual page.

Notes

The RSA structure passed to the private key encoding functions should have all the PKCS#1 private key components present.

The data encoded by the private key functions is unencrypted and therefore offers no private key security.

The NET format functions are present to provide compatibility with certain very old software. This format has some severe security weaknesses and should be avoided if possible.