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#include <string.h>
#include <openssl/x509v3.h>
int X509V3_EXT_info_access(const X509V3_EXT_METHOD *method, void *ext_str)
{
printf("精细的数据: NID_info_access\n");
AUTHORITY_INFO_ACCESS *ainfo = ext_str;
STACK_OF(CONF_VALUE) *result = NULL;
for (int i = 0; i < sk_ACCESS_DESCRIPTION_num(ainfo); i++)
{
ACCESS_DESCRIPTION *desc = sk_ACCESS_DESCRIPTION_value(ainfo, i);
result = i2v_GENERAL_NAME((X509V3_EXT_METHOD *)method, desc->location, result);
}
if (result == NULL)
{
printf("ERROR: [%s][%s][%d]\n", __FILE__, __func__, __LINE__);
return -1;
}
for (int i = 0; i < sk_CONF_VALUE_num(result); i++)
{
CONF_VALUE *nval = sk_CONF_VALUE_value(result, i);
if (NULL != nval && NULL != nval->name && NULL != nval->value)
{
printf("Name=[%s], Value=[%s]\n", nval->name, nval->value);
}
}
sk_CONF_VALUE_pop_free(result, X509V3_conf_free);
return 0;
}
int X509V3_EXT_subject_alt_name(const X509V3_EXT_METHOD *method, void *ext_str)
{
int i;
GENERAL_NAMES *gens = ext_str;
STACK_OF(CONF_VALUE) *result = NULL;
for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
{
GENERAL_NAME *gen = sk_GENERAL_NAME_value(gens, i);
result = i2v_GENERAL_NAME((X509V3_EXT_METHOD *)method, gen, result);
}
if(NULL == result)
{
printf("ERROR: [%s][%s][%d]\n", __FILE__, __func__, __LINE__);
return -1;
}
printf("精细的数据: NID_subject_alt_name\n");
for (i = 0; i < sk_CONF_VALUE_num(result); i++)
{
CONF_VALUE *nval = sk_CONF_VALUE_value(result, i);
if (NULL != nval && NULL != nval->name && NULL != nval->value)
{
printf("Name=[%s], Value=[%s]\n", nval->name, nval->value);
}
}
sk_CONF_VALUE_pop_free(result, X509V3_conf_free);
return 0;
}
int X509V3_EXT_detial_print(int nid, X509_EXTENSION *x509_ext)
{
ASN1_OCTET_STRING *extoct = X509_EXTENSION_get_data(x509_ext);
const unsigned char *p = ASN1_STRING_get0_data(extoct);
int extlen = ASN1_STRING_length(extoct);
const X509V3_EXT_METHOD *method = method = X509V3_EXT_get(x509_ext);
void *ext_str = ASN1_item_d2i(NULL, &p, extlen, ASN1_ITEM_ptr(method->it));
if(NULL == method || NULL == ext_str)
{
printf("ERROR: [%s][%s][%d]\n", __FILE__, __func__, __LINE__);
return -1;
}
switch(nid)
{
case NID_subject_alt_name:
X509V3_EXT_subject_alt_name(method, ext_str);
break;
case NID_info_access:
X509V3_EXT_info_access(method, ext_str);
break;
}
ASN1_item_free(ext_str, ASN1_ITEM_ptr(method->it));
return 0;
}
void GET_X509_EXTENSION(X509 *x509)
{
int loop = X509_get_ext_count(x509);
printf("X509 证书扩展项个数 [%d]\n", loop);
for(int i = 0; i < loop; i++)
{
X509_EXTENSION *x509_ext = X509_get_ext(x509, i);
if(NULL == x509_ext)
{
printf("FAIL: X509_get_ext \n");
exit(-1);
}
ASN1_OBJECT *obj = X509_EXTENSION_get_object(x509_ext);
BIO *ext_bio = BIO_new(BIO_s_mem());
X509V3_EXT_print(ext_bio, x509_ext, 0, 0);
BUF_MEM *bptr = NULL;
BIO_get_mem_ptr(ext_bio, &bptr);
unsigned nid = OBJ_obj2nid(obj);
if (nid == NID_undef)
{
printf("UnKnown nid[%d]\n", nid);
return;
}
ASN1_OBJECT_free(obj);
printf("[%02d] nid=[%04d] TYPE=[%s]\n", i, nid, OBJ_nid2ln(nid));
{
printf(" ");
char buf[4096];
memset(buf, 0, 4096);
memcpy(buf, bptr->data, bptr->length);
printf("len=[%zu], value=[%s]\n", bptr->length, buf);
}
BIO_free(ext_bio);
X509V3_EXT_detial_print(nid, x509_ext);
printf("\n");
}
}
int X509_Public_Print(X509 *x509)
{
EVP_PKEY *pkey = X509_get0_pubkey(x509);
if(NULL == pkey)
{
printf("FAIL X509_get0_pubkey\n");
exit(1);
}
char Algorithm[80] = {0};
int Len_Algorithm = sizeof(Algorithm);
ASN1_OBJECT *xpoid;
X509_PUBKEY *xpkey = X509_get_X509_PUBKEY(x509);
X509_PUBKEY_get0_param(&xpoid, NULL, NULL, NULL, xpkey);
Len_Algorithm = i2t_ASN1_OBJECT(Algorithm, Len_Algorithm, xpoid);
printf("公钥算法:[%s]\n", Algorithm);
int keyid = EVP_PKEY_id(pkey);
printf("证书类型:%d\n", keyid);
if (keyid == EVP_PKEY_EC)
{
struct ec_key_st *eckey = EVP_PKEY_get0_EC_KEY(pkey);
if(NULL == eckey)
{
printf("ERROR EVP_PKEY_get0_EC_KEY\n");
exit(1);
}
const EC_GROUP *group = EC_KEY_get0_group(eckey);
printf("加密级别:%d bit\n", EC_GROUP_order_bits(group));
size_t publen = 0;
unsigned char *pub = NULL;
publen = EC_KEY_key2buf(eckey, EC_KEY_get_conv_form(eckey), &pub, NULL);
if (publen == 0)
{
printf("ERROR: EC_KEY_key2buf\n");
}
printf("公钥长度=[%zd]\n", publen);
for(int i=0; i<publen; i++)
{
printf("%02X ", pub[i]);
if(i%8 == 7)
printf(" ");
if(i%32 == 31)
printf("\n");
}
printf("\n");
OPENSSL_free(pub);
}
else if(keyid == NID_rsaEncryption)
{
const RSA *rsa = EVP_PKEY_get0_RSA(pkey);
if (rsa != NULL)
printf("加密级别:%d bit \n", BN_num_bits(RSA_get0_n(rsa)));
int buflen = BN_num_bytes(RSA_get0_n(rsa)) + 1;
printf("RSA公钥长度:%d Byte\n", buflen);
unsigned char *buf = OPENSSL_malloc(buflen);
if (buf == NULL)
{
printf("ERROR: OPENSSL_malloc\n");
return -1;
}
buf[0]=0;
buflen = BN_bn2bin(RSA_get0_n(rsa), buf+1);
if (buf[1] & 0x80)
buflen++;
printf("len=%d\n", buflen);
for(int i=0; i<buflen; i++)
{
printf("%02X ", (unsigned char)buf[i]);
if(i%8==7)
printf(" ");
if(i%32==31)
printf("\n");
}
printf("\n");
OPENSSL_free(buf);
}
EVP_PKEY_free(pkey);
return 0;
}
int main (int num, char**list)
{
if(num <2)
{
printf("need a DER file\n");
exit(-1);
}
printf("File name %s\n", list[1]);
BIO *bio_file = BIO_new_file(list[1], "rb");
if(NULL == bio_file)
{
printf("FAIL: BIO_new_file \n");
exit(-1);
}
X509 *x509 = d2i_X509_bio(bio_file, NULL);
if(NULL == x509)
{
printf("FAIL: d2i_X509_bio \n");
exit(-1);
}
printf("1. Certificate Version=[%ld]\n", X509_get_version(x509));
ASN1_INTEGER* serial = X509_get_serialNumber(x509);
char buf[2048];
memset(buf, 0, 2048);
memcpy(buf, ASN1_STRING_get0_data(serial), ASN1_STRING_length(serial) );
printf("2. Certificate Serial len=[%d] Serial:", ASN1_STRING_length(serial));
for(int i=0; i < ASN1_STRING_length(serial); i++)
{
printf("%02X", (unsigned char)buf[i]);
}
printf("\n");
const X509_ALGOR *tsig_alg = X509_get0_tbs_sigalg(x509);
const int sig_nid = OBJ_obj2nid(tsig_alg->algorithm);
if (sig_nid != NID_undef)
{
printf("3. signature=[%s][%s]\n", OBJ_nid2sn(sig_nid), OBJ_nid2ln(sig_nid));
}
const X509_NAME *X509_issuer_name = X509_get_issuer_name(x509);
char *issuer_name = X509_NAME_oneline(X509_issuer_name, NULL, 0);
printf("4. issuer_name=[%s]\n", issuer_name);
OPENSSL_free(issuer_name);
const ASN1_TIME *ASN1_time;
struct tm Certificate_time;
printf("5. Certificate time\n");
ASN1_time = X509_get0_notBefore(x509);
if(ASN1_TIME_to_tm(ASN1_time, &Certificate_time) > 0)
{
printf("%4sFrom: %s"," ", asctime(&Certificate_time));
}
ASN1_time = X509_get0_notAfter(x509);
if(ASN1_TIME_to_tm(ASN1_time, &Certificate_time) > 0)
{
printf("%4sTo : %s", " ",asctime(&Certificate_time));
}
const X509_NAME *X509_subject_name = X509_get_subject_name(x509);
char *subject_name = X509_NAME_oneline(X509_subject_name, NULL, 0);
int subject_number = X509_NAME_entry_count(X509_subject_name);
printf("6. subject num=[%d][%s]\n", subject_number, subject_name);
OPENSSL_free(subject_name);
printf("7. Subject PublicKey\n");
X509_Public_Print(x509);
printf("扩展学习1：如何精细的获取 证书接受者的数据?\n");
{
X509_NAME *subj = X509_get_subject_name(x509);
printf("subject_name_num=[%d]\n", X509_NAME_entry_count(subj));
for (int i = 0; i < X509_NAME_entry_count(subj); i++)
{
X509_NAME_ENTRY *e = X509_NAME_get_entry(subj, i);
ASN1_STRING *type = (ASN1_STRING *)X509_NAME_ENTRY_get_object(e);
ASN1_STRING *value = X509_NAME_ENTRY_get_data(e);
const unsigned char *str1 = ASN1_STRING_get0_data(type);
const unsigned char *str2 = ASN1_STRING_get0_data(value);
printf("[%02d][%s]=[%s]\n", i, str1, str2);
}
}
printf("扩展学习2：如何精细的获取 证书签发着的数据?\n");
{
X509_NAME *subj = X509_get_issuer_name(x509);
printf("subject_name_num=[%d]\n", X509_NAME_entry_count(subj));
for (int i = 0; i < X509_NAME_entry_count(subj); i++)
{
X509_NAME_ENTRY *e = X509_NAME_get_entry(subj, i);
ASN1_STRING *type = (ASN1_STRING *)X509_NAME_ENTRY_get_object(e);
ASN1_STRING *value = X509_NAME_ENTRY_get_data(e);
const unsigned char *str1 = ASN1_STRING_get0_data(type);
const unsigned char *str2 = ASN1_STRING_get0_data(value);
printf("[%02d][%s]=[%s]\n", i, str1, str2);
}
}
printf("X509 扩展处理 \n");
GET_X509_EXTENSION(x509);
BIO_free_all(bio_file);
X509_free(x509);
printf("********************************************************\n");
}
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