C中的x509证书validation

我有DER和PEM格式的证书，我的目标是检索Issuer和Subject的字段，并使用CA公钥validation证书，同时使用根公钥validationCA证书。 我能够检索发行人和主题的所有细节，但无法validation证书。
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)); 

对于validation我经历了不同的方法，但我无法validation：

一个）

 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unsigned char缓冲区。

Answer 1

我使用以下代码validation证书

init 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); 

你还需要清理m_store

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

Answer 2

看看我自己回答的问题： https ： //stackoverflow.com/questions/3412032/openssl-c-how-do-you-verify-a-public-key-was-issued-by-your-private-做你需要的东西还有很长的路要走。

Answer 3

 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; } 

执行此操作后，我无法validation自签名证书