如何以编程方式提取证书信息？(How to programmatically extract inf

我有一个生成的证书，但我希望能够从证书提取信息，例如国家，有效性，公共密钥等等。我得比较从一些其他的证书，我已经保存在我的C PROGRAME retrived此信息。

我知道，如果我用这样的函数将打印我的证书信息：

void print_certificate(const char* cert)
{
    X509 *x509 = NULL;
    BIO *i = BIO_new(BIO_s_file());
    BIO *o = BIO_new_fp(stdout,BIO_NOCLOSE);

    if((BIO_read_filename(i, cert) <= 0) ||
       ((x509 = PEM_read_bio_X509_AUX(i, NULL, NULL, NULL)) == NULL)) {
           printf("Bad certificate, unable to read\n");
    }

    X509_print_ex(o, x509, XN_FLAG_COMPAT, X509_FLAG_COMPAT);   

    if(x509)
        X509_free(x509);
}

但我要的是唯一的信息某些部分。怎么做到呢？

谢谢

Answer 1:

尝试grep _get_ /usr/include/openssl/x509.h

这里有一些事情可能对你有用：

EVP_PKEY *  X509_get_pubkey(X509 *x);
#define     X509_CRL_get_issuer(x) ((x)->crl->issuer)
#define     X509_get_notBefore(x) ((x)->cert_info->validity->notBefore)
#define     X509_get_notAfter(x) ((x)->cert_info->validity->notAfter)

此外，检查源代码t_x509.c包含X509_print_ex 。这大概是最有用的。

Answer 2:

见x509.h的OpenSSL（例如这里）。你会发现很多有用的功能。例：

#define     X509_get_version(x) ASN1_INTEGER_get((x)->cert_info->version)
/* #define  X509_get_serialNumber(x) ((x)->cert_info->serialNumber) */
#define     X509_get_notBefore(x) ((x)->cert_info->validity->notBefore)
#define     X509_get_notAfter(x) ((x)->cert_info->validity->notAfter)
#define     X509_extract_key(x) X509_get_pubkey(x) /*****/
#define     X509_REQ_get_version(x) ASN1_INTEGER_get((x)->req_info->version)
#define     X509_REQ_get_subject_name(x) ((x)->req_info->subject)
#define     X509_REQ_extract_key(a) X509_REQ_get_pubkey(a)
#define     X509_name_cmp(a,b)  X509_NAME_cmp((a),(b))
#define     X509_get_signature_type(x) EVP_PKEY_type(OBJ_obj2nid((x)->sig_alg->algorithm))

#define     X509_CRL_get_version(x) ASN1_INTEGER_get((x)->crl->version)
#define     X509_CRL_get_lastUpdate(x) ((x)->crl->lastUpdate)
#define     X509_CRL_get_nextUpdate(x) ((x)->crl->nextUpdate)
#define     X509_CRL_get_issuer(x) ((x)->crl->issuer)
#define     X509_CRL_get_REVOKED(x) ((x)->crl->revoked)

/* This one is only used so that a binary form can output, as in
 * i2d_X509_NAME(X509_get_X509_PUBKEY(x),&buf) */
#define     X509_get_X509_PUBKEY(x) ((x)->cert_info->key)

文章来源: How to programmatically extract information from certificate?