x509證書驗證C

Question

我確實擁有DER和PEM格式的證書，我的目標是檢索頒發者和Subject的字段，並使用CA公鑰驗證證書，同時使用根公鑰驗證CA證書。 我能夠檢索發行人和主題的所有細節，但無法驗證證書。
所使用的API：

x509 = d2i_X509_fp (fp, &x509); //READING DER Format 
x509 = PEM_read_X509 (fp, &x509, NULL, NULL); //READING PEM Format 
//to retrieve the Subject: 
X509_NAME_oneline(X509_get_subject_name(x509), subject, sizeof (subject)); 
//to retrieve the Issuer: 
X509_NAME_oneline(X509_get_issuer_name(x509), issuer, sizeof (issuer)); 

//To store the CA public key (in unsigned char *key) that will be used to verify the 
//certificate (in my case always sha1WithRSAEncryption): 
RSA *x = X509_get_pubkey(x509)->pkey.rsa; 
bn = x->n; 
//extracts the bytes from public key & convert into unsigned char buffer 
buf_len = (size_t) BN_num_bytes (bn); 
stored_CA_pubKey = (unsigned char *)malloc (buf_len); 
i_n = BN_bn2bin (bn, (unsigned char *)stored_CA_pubKey); 
if (i_n != buf_len) 
    LOG(ERROR," : key error\n"); 
if (key[0] & 0x80) 
    LOG(DEBUG, "00\n"); 

stored_CA_pubKeyLen = EVP_PKEY_size(X509_get_pubkey(x509)); 

爲了驗證我通過不同的方法去，但我無法驗證：

一）

i_x509_verify = X509_verify(cert_x509, ca_pubkey); 

B）

/* verify the signature */ 
int iRet1, iRet2, iReason; 
iRet1 = EVP_VerifyInit(&md_ctx, EVP_sha1()); 
iRet2 = EVP_VerifyUpdate(&md_ctx, cert_code, cert_code_len); 
rv = EVP_VerifyFinal(&md_ctx, (const unsigned char *)stored_CA_pubKey, 
    stored_CA_pubKeyLen, cert_pubkey); 

注意：cert_code和stored_CA_pubKey是無符號字符緩衝區。

Answer 1

我用下面的代碼用於驗證證書

初始化的CertStore：

X509_STORE* m_store = X509_STORE_new(); 
X509_LOOKUP* m_lookup = X509_STORE_add_lookup(m_store,X509_LOOKUP_file());  
X509_STORE_load_locations(m_store, "CAFile.pem", NULL); 
X509_STORE_set_default_paths(m_store); 
X509_LOOKUP_load_file(m_lookup,"CAFile.pem",X509_FILETYPE_PEM) 
// alternative lookup by hashdir 
// X509_LOOKUP* m_lookup=X509_STORE_add_lookup(m_store,X509_LOOKUP_hash_dir()); 

VerifyCert：

X509_STORE_CTX *storeCtx = X509_STORE_CTX_new(); 
X509_STORE_CTX_init(storeCtx,m_store,cert,NULL); 
X509_STORE_CTX_set_flags(storeCtx, X509_V_FLAG_CB_ISSUER_CHECK); 
if (X509_verify_cert(storeCtx) == 1) 
{ 
    printf("success"); 
} 
else 
{ 
    printf("Verificatione rror: %s",X509_verify_cert_error_string(storeCtx->error)); 
} 
X509_STORE_CTX_free(storeCtx); 

還需要清理m_store

if(m_store != NULL) 
{ 
    X509_STORE_free(m_store); 
    m_store = NULL; 
} 

Answer 2

X509_STORE* m_store = NULL; 

X509_LOOKUP *m_lookup = NULL; 
X509_STORE_CTX *storeCtx = NULL; 
m_store = X509_STORE_new(); 
if(NULL == m_store) goto exit; 
m_lookup = X509_STORE_add_lookup(m_store, X509_LOOKUP_file()); 
if(NULL == m_lookup) goto exit; 
X509_STORE_load_locations(m_store, CA_CERT_PATH, NULL); 
X509_STORE_set_default_paths(m_store); 
X509_LOOKUP_load_file(m_lookup,CA_CERT_PATH, X509_FILETYPE_ASN1); 
m_lookup = X509_STORE_add_lookup(m_store, X509_LOOKUP_hash_dir()); 
if(NULL == m_lookup) goto exit; 
storeCtx = X509_STORE_CTX_new(); 
if(NULL == storeCtx) goto exit; 
X509_STORE_CTX_init(storeCtx,m_store,cer_x509,NULL); 
X509_STORE_CTX_set_flags(storeCtx, /*X509_V_FLAG_CHECK_SS_SIGNATURE*/0x4000); 
if (X509_verify_cert(storeCtx) == 1) 
{ 
printf("success\n"); 
} 
else 
{ 
printf("Verification error: %s\n",X509_verify_cert_error_string(storeCtx->error)); 
} 
exit: 
    if(NULL != storeCtx) X509_STORE_CTX_free(storeCtx); 
    if(m_store != NULL) 
    { 
     X509_STORE_free(m_store); 
     m_store = NULL; 
    } 

這樣做後還我無法驗證自簽名證書

Answer 3

看看我的自我回答的問題：https://stackoverflow.com/questions/3412032/openssl-c-how-do-you-verify-a-public-key-was-issued-by-your-private-ca它走一段很長的路要走做你所需要的。