add wrapper function for certificate download

crypto/x509/x509.h

@@ -663,6 +663,7 @@ int X509_signature_print(BIO *bp,X509_ALGOR *alg, ASN1_STRING *sig);
 
 int X509_sign(X509 *x, EVP_PKEY *pkey, const EVP_MD *md);
 int X509_sign_ctx(X509 *x, EVP_MD_CTX *ctx);
+int X509_http_nbio(OCSP_REQ_CTX *rctx, X509 **pcert);
 int X509_REQ_sign(X509_REQ *x, EVP_PKEY *pkey, const EVP_MD *md);
 int X509_REQ_sign_ctx(X509_REQ *x, EVP_MD_CTX *ctx);
 int X509_CRL_sign(X509_CRL *x, EVP_PKEY *pkey, const EVP_MD *md);

crypto/x509/x_all.c

@@ -103,6 +103,12 @@ int X509_sign_ctx(X509 *x, EVP_MD_CTX *ctx)
 		x->sig_alg, x->signature, x->cert_info, ctx);
 	}
 
+int X509_http_nbio(OCSP_REQ_CTX *rctx, X509 **pcert)
+	{
+	return OCSP_REQ_CTX_nbio_d2i(rctx,
+				(ASN1_VALUE **)pcert, ASN1_ITEM_rptr(X509));
+	}
+
 int X509_REQ_sign(X509_REQ *x, EVP_PKEY *pkey, const EVP_MD *md)
 	{
 	return(ASN1_item_sign(ASN1_ITEM_rptr(X509_REQ_INFO),x->sig_alg, NULL,