x509(3) OpenSSL x509(3) NNAAMMEE x509 - X.509 certificate handling SSYYNNOOPPSSIISS #include DDEESSCCRRIIPPTTIIOONN A X.509 certificate is a structured grouping of information about an individual, a device, or anything one can imagine. A X.509 CRL (cer- tificate revocation list) is a tool to help determine if a certificate is still valid. The exact definition of those can be found in the X.509 document from ITU-T, or in RFC3280 from PKIX. In OpenSSL, the type X509 is used to express such a certificate, and the type X509_CRL is used to express a CRL. A related structure is a certificate request, defined in PKCS#10 from RSA Security, Inc, also reflected in RFC2896. In OpenSSL, the type X509_REQ is used to express such a certificate request. To handle some complex parts of a certificate, there are the types X509_NAME (to express a certificate name), X509_ATTRIBUTE (to express a certificate attributes), X509_EXTENSION (to express a certificate extension) and a few more. Finally, there's the supertype X509_INFO, which can contain a CRL, a certificate and a corresponding private key. XX550099___._._., dd22ii__XX550099___._._. and ii22dd__XX550099___._._. handle X.509 certificates, with some exceptions, shown below. XX550099__CCRRLL___._._., dd22ii__XX550099__CCRRLL___._._. and ii22dd__XX550099__CCRRLL___._._. handle X.509 CRLs. XX550099__RREEQQ___._._., dd22ii__XX550099__RREEQQ___._._. and ii22dd__XX550099__RREEQQ___._._. handle PKCS#10 certificate requests. XX550099__NNAAMMEE___._._. handle certificate names. XX550099__AATTTTRRIIBBUUTTEE___._._. handle certificate attributes. XX550099__EEXXTTEENNSSIIOONN___._._. handle certificate extensions. SSEEEE AALLSSOO _X_5_0_9___N_A_M_E___E_N_T_R_Y___g_e_t___o_b_j_e_c_t(3), _X_5_0_9___N_A_M_E___a_d_d___e_n_t_r_y___b_y___t_x_t(3), _X_5_0_9___N_A_M_E___a_d_d___e_n_t_r_y___b_y___N_I_D(3), _X_5_0_9___N_A_M_E___p_r_i_n_t___e_x(3), _X_5_0_9___N_A_M_E___n_e_w(3), _d_2_i___X_5_0_9(3), _d_2_i___X_5_0_9___A_L_G_O_R(3), _d_2_i___X_5_0_9___C_R_L(3), _d_2_i___X_5_0_9___N_A_M_E(3), _d_2_i___X_5_0_9___R_E_Q(3), _d_2_i___X_5_0_9___S_I_G(3), _c_r_y_p_t_o(3), _x_5_0_9_v_3(3) 1.0.1u 2016-09-22 x509(3)