3

当我运行 OpenSSL CMS 加密和解密演示时,我收到以下错误:

Error Decrypting Data
2900476676:error:0200B009:system library:fread:Bad file descriptor:bss_file.c:245:
2900476676:error:20082002:BIO routines:FILE_READ:system lib:bss_file.c:246:
2900476676:error:0606506D:digital envelope routines:EVP_DecryptFinal_ex:wrong final block length:evp_enc.c:460:

它发生在CMS_decrypt()方法中。

有谁知道出了什么问题?

更新#1:

我正在使用objective-c中的库(并且也在C++中尝试过)。 它发生在本节:

    int error = CMS_decrypt(cms, rkey, rcert, /*out*/ bout, NULL, 0);
    if (!error) {
        fprintf(stderr, "Error Decrypting Data\n");
        ERR_print_errors_fp(stderr);
        printf("error code: %d\n", ERR_get_error());
        assert(false);
    }

更新#2:

添加了完整的解密源。

- (void) decryptOrig {
    BIO *in = NULL, *out = NULL, *tbio = NULL;
    X509 *rcert = NULL;
    EVP_PKEY *rkey = NULL;
    CMS_ContentInfo *cms = NULL;
    int ret = 1;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];


    NSString *iosPathToFile = [NSString stringWithFormat:@"%@/encrypted.enc", documentsDirectory]; //[[NSBundle mainBundle] pathForResource:@"encrypted" ofType:@"enc"];
    NSString *iosPathToCertificate = [[NSBundle mainBundle] pathForResource:@"signer" ofType:@"pem"];
    NSString *iosPathToKey = [[NSBundle mainBundle] pathForResource:@"christof" ofType:@"key"];


    NSString *iosPathToOrigFinal = [NSString stringWithFormat:@"%@/original.txt", documentsDirectory];




    OpenSSL_add_all_algorithms();
    ERR_load_crypto_strings();

    /* Read in recipient certificate and private key */
    tbio = BIO_new_file([iosPathToCertificate cStringUsingEncoding:NSUTF8StringEncoding], "r");



    if (!tbio)
        goto err;

    rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);

    /*BIO *output = BIO_new(BIO_s_mem());
    X509_print(output, rcert);
    char *temp = malloc(50000);
    BIO_read(output, temp, 50000);

    printf("cert: %s", temp);*/

    //temp for output
    BIO *bout = BIO_new_fp (stdout, BIO_NOCLOSE);


    BIO_reset(tbio);

    rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);

    //EVP_PKEY_print_private(bout, rkey, 0, NULL);

    if (!rcert || !rkey)
        goto err;

    /* Open S/MIME message to decrypt */

    in = BIO_new_file([iosPathToFile cStringUsingEncoding:NSUTF8StringEncoding], "r");



    if (!in)
        goto err;

    /* Parse message */
    cms = SMIME_read_CMS(in, NULL);

    //CMS_ContentInfo_print_ctx(bout, cms, 0, NULL);


    if (!cms)
        goto err;

    out = BIO_new_file([iosPathToOrigFinal cStringUsingEncoding:NSUTF8StringEncoding], "w");
    NSLog(iosPathToOrigFinal);
    /*char *mytestoutput = malloc(50000);
    memset(mytestoutput, 0, 50000);
    out = BIO_new_mem_buf(mytestoutput, 50000);*/

    if (!out)
        assert(false);

    /* Decrypt S/MIME message */
    int error = CMS_decrypt(cms, rkey, rcert, out, NULL, 0);
    if (!error) {
        fprintf(stderr, "Error Decrypting Data\n");
        ERR_print_errors_fp(stderr);
        printf("error code: %d\n", ERR_get_error());
        assert(false);
    }


    ret = 0;

err:

    if (ret)
    {
        fprintf(stderr, "Error Decrypting Data\n");
        ERR_print_errors_fp(stderr);
    }

    if (cms)
        CMS_ContentInfo_free(cms);
    if (rcert)
        X509_free(rcert);
    if (rkey)
        EVP_PKEY_free(rkey);

    if (in)
        BIO_free(in);
    if (out)
        BIO_free(out);
    if (tbio)
        BIO_free(tbio);

    return ret;

}

我已删除boutout在加密方法中使用了

更新#3:

对称加密类型可能有问题吗?CBC等...?

4

1 回答 1

0

部分问题可能是您为解密所做的方法调用有点麻烦——这是一个棘手的问题。

你有你的输出文件,它希望在其中找到一个输入内容文件 - 这也留下了一个空生物,它希望在其中放置纯文本,因此它会返回这个错误。

这是我认为的外观

int error = CMS_decrypt(cms, rkey, rcert, NULL, out, 0);

不是

int error = CMS_decrypt(cms, rkey, rcert, out, NULL, 0); // won't decrypt 

我认为实际上发生的事情是库中的方法签名本身在某些时候发生了变化,但是这个旧的方法签名仍然存在于 cms 功能的一些较旧的演示代码中。我认为他们改变了它以更好地适应他们的惯例。

祝你好运

于 2012-10-04T10:59:29.627 回答