问题OpenSSL库 [英] Problem with OpenSSL library

问题描述

我尝试使用RSA算法简单的文本进行加密。我有一个问题，我的code。

I try to encrypt simple text with RSA algorithm. I have a problem with my code.

RSA        *_RSA ;
unsigned char text[2560] = "A";
unsigned char sectext[2560];
unsigned char decrypttext[2560];
int i = 0;

_RSA = RSA_generate_key ( 1024, 65537, NULL, NULL );
i = RSA_public_encrypt ( 1, text,    sectext,     _RSA, RSA_PKCS1_OAEP_PADDING );
i = RSA_private_decrypt( 1, sectext, decrypttext, _RSA, RSA_PKCS1_OAEP_PADDING);
RSA_free ( _RSA );

RSA_public_encrypt的返回值为128
RSA_private_decrypt返回-1。如果我尝试用COUT显示decrypttext我什么也得不到。
感谢。

The return value of RSA_public_encrypt is 128.
RSA_private_decrypt return -1. If I try to display decrypttext with cout i get nothing.
Thanks.

推荐答案

您不应传递1 RSA_private_decrypt ，但您要解密块，即长度。 RSA_public_encrypt = 128的返回值，你不知​​道明文的长度时，您解密！

You should not pass 1 to RSA_private_decrypt but the length of the block you are trying to decrypt, ie. the return value of RSA_public_encrypt = 128. You do not know the length of the cleartext when you are decrypting!

这个完整的示例程序的结果：

This complete sample program results in:

128 from encrypt. 
1 from decrypt: 'A'

来源：

#include <openssl/rsa.h>
#include <openssl/engine.h>
#include <stdio.h>

int main(int argc, char **argv)
{
    RSA *myRSA;
    unsigned char cleartext[2560] = "A";
    unsigned char encrypted[2560] = { 0 };
    unsigned char decrypted[2560] = { 0 };
    int resultEncrypt = 0;
    int resultDecrypt = 0;

    myRSA = RSA_generate_key ( 1024, 65537, NULL, NULL );
    resultEncrypt = RSA_public_encrypt ( 1 /* strlen(cleartext) */, cleartext, encrypted, myRSA, RSA_PKCS1_OAEP_PADDING );
    printf("%d from encrypt.\n", resultEncrypt);
    resultDecrypt = RSA_private_decrypt( 128 /* resultEncrypt */, encrypted, decrypted, myRSA, RSA_PKCS1_OAEP_PADDING);
    printf("%d from decrypt: '%s'\n", resultDecrypt, decrypted);
    RSA_free ( myRSA );

    return 0;
}

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