使用OpenSSL的加密和解密错误0x0407106B [英] Encryption and decryption error 0x0407106B using OpenSSL

问题描述

我正在用C编写一个例程，该例程使用公钥读取base64字符串，然后继续对字符串进行加密.我还测试了相同字符串的解密，但是尝试进行解码时出现错误0x0407106B:

I'm writing a routine in C that reads a base64 string with the public key and proceeds to encrypt a string. I also test the same string's decryption but I'm getting error 0x0407106B when trying to do the decoding:

$ openssl errstr 0x0407106B
error:0407106B:rsa routines:RSA_padding_check_PKCS1_type_2:block type is not 02

这是代码

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <openssl/rsa.h>
#include <openssl/engine.h>

//#define PADDING RSA_PKCS1_OAEP_PADDING
#define PADDING RSA_PKCS1_PADDING
//#define PADDING RSA_NO_PADDING

main() {

// public key
char *b64_pKey = "-----BEGIN PUBLIC KEY-----\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCp2w+8HUdECo8V5yuKYrWJmUbL\ntD6nSyVifN543axXvNSFzQfWNOGVkMsCo6W4hpl5eHv1p9Hqdcf/ZYQDWCK726u6\nhsZA81AblAOOXKaUaxvFC+ZKRJf+MtUGnv0v7CrGoblm1mMC/OQI1JfSsYi68Epn\naOLepTZw+GLTnusQgwIDAQAB\n-----END PUBLIC KEY-----\n";

// private key
char *b64priv_key = "-----BEGIN RSA PRIVATE KEY-----\nMIICXAIBAAKBgQCp2w+8HUdECo8V5yuKYrWJmUbLtD6nSyVifN543axXvNSFzQfW\nNOGVkMsCo6W4hpl5eHv1p9Hqdcf/ZYQDWCK726u6hsZA81AblAOOXKaUaxvFC+ZK\nRJf+MtUGnv0v7CrGoblm1mMC/OQI1JfSsYi68EpnaOLepTZw+GLTnusQgwIDAQAB\nAoGBAKDuq3PikblH/9YS11AgwjwC++7ZcltzeZJdGTSPY1El2n6Dip9ML0hUjeSM\nROIWtac/nsNcJCnvOnUjK/c3NIAaGJcfRPiH/S0Ga6ROiDfFj2UXAmk/v4wRRUzr\n5lsA0jgEt5qcq2Xr/JPQVGB4wUgL/yQK0dDhW0EdrJ707e3BAkEA1aIHbmcVfCP8\nY/uWuK0lvWxrIWfR5MlHhI8tD9lvkot2kyXiV+jB6/gktwk1QaFsy7dCXn7w03+k\nxrjEGGN+kQJBAMuKf55lDtU9K2Js3YSStTZAXP+Hz7XpoLxmbWFyGvBx806WjgAD\n624irwS+0tBxkERbRcisfb2cXmAx8earT9MCQDZuVCpjBWxd1t66qYpgQ29iAmG+\njBIY3qn9uOOC6RSTiCCx1FvFqDMxRFmGdRVFxeyZwsVE3qNksF0Zko0MPKECQCEe\noDV97DP2iCCz5je0R5hUUM2jo8DOC0GcyR+aGZgWcqjPBrwp5x08t43mHxeb4wW8\ndFZ6+trnntO4TMxkA9ECQB+yCPgO1zisJWYuD46KISoesYhwHe5C1BQElQgi9bio\nU39fFo88w1pok23a2CZBEXguSvCvexeB68OggdDXvy0=\n-----END RSA PRIVATE KEY-----\n";

// String to encrypt
char *str = "1234";

ERR_load_crypto_strings();  

BIO *bpo = BIO_new_mem_buf(b64_pKey, -1);
RSA *pubKey = PEM_read_bio_RSA_PUBKEY(bpo, NULL, NULL, NULL);

if ( !pubKey ) {
    printf("%s\n", ERR_error_string(ERR_get_error(), NULL));
    return;
}

int rsa_length = RSA_size(pubKey);

BIO *b64 = NULL;
BIO *bmem = NULL;
BUF_MEM *bptr = NULL;

unsigned char encrypted[2560] = { 0 };
unsigned char retencrypted[2560] = { 0 };

int resultEncrypt = RSA_public_encrypt(PADDING, str, encrypted, pubKey, PADDING);
if ( resultEncrypt == -1 ) {
    printf("%s\n", ERR_error_string(ERR_get_error(), NULL));
    return;
}

/*
 * Show base 64 encrypted string  
 */ 
b64 = BIO_new((BIO_METHOD *)BIO_f_base64());
BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
bmem = BIO_new(BIO_s_mem());
b64 = BIO_push(b64, bmem);
BIO_write(b64, encrypted, resultEncrypt);
BIO_flush(b64);
BIO_get_mem_ptr(b64, &bptr);

memcpy(retencrypted, bptr->data, bptr->length);
BIO_free(b64);
BIO_free(bpo);
RSA_free(pubKey);

printf("Encrypted string:%s\n",retencrypted);

/*
 * Now decrypt this very string with the private key
 */ 

BIO *bpop = BIO_new_mem_buf(b64priv_key, -1);
RSA *privKey = PEM_read_bio_RSAPrivateKey(bpop, NULL, NULL, NULL);

if ( !privKey ) {
    printf("%s\n", ERR_error_string(ERR_get_error(), NULL));
    return;
}

rsa_length = RSA_size(privKey);

unsigned char decrypted[2560] = { 0 };

int resultDecrypt = RSA_private_decrypt( RSA_size(privKey), retencrypted, decrypted, privKey, PADDING);

if ( resultDecrypt == -1 ) {
    printf("%s\n", ERR_error_string(ERR_get_error(), NULL));
    return;
}

printf("resultDecrypt=%d\ndecrypted string: %s\n",resultDecrypt,decrypted);
BIO_free(bpop);
RSA_free(privKey);
ERR_free_strings();
}

注意:我使用导出了私钥

Note: I exported the private key using

openssl rsa -in rsa_privatekey.pem -check

和公共密钥:

openssl rsa -in rsa_privatekey.pem -pubout

我为什么会收到错误消息?

Why am I getting the error?

推荐答案

问题是您正在尝试解密base64编码结果. 您应该尝试解密加密结果.

The problem is that you're trying to decrypt the base64 encoded result. You should try to decrypt the result of the encryption.

也就是说，而不是:

int resultDecrypt = RSA_private_decrypt( RSA_size(privKey), retencrypted, decrypted, privKey, PADDING);

您应该致电:

int resultDecrypt = RSA_private_decrypt( RSA_size(privKey), encrypted, decrypted, privKey, PADDING);

此外，加密调用中存在问题:

Also, there is a problem in the encryption call:

int resultEncrypt = RSA_public_encrypt(PADDING, str, encrypted, pubKey, PADDING);

为什么要以flen的形式传递填充?这应该是字符串的长度(即4或5，取决于您是否要加密空字符).

Why are you passing PADDING as flen? This should be the length of the string (i.e. 4 or 5, depending on whether you want to encrypt the null character).

如果您想将加密的字符串写为ASCII码(使用base64编码)，就可以了.但是在解密之前必须先将其解码.

If you want to write the encrypted string as ASCII (encoded using base64), that's fine. But you have to decode it back before you decrypt it.

这篇关于使用OpenSSL的加密和解密错误0x0407106B的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！