Cryptography and SSL/TLS Toolkit



OSSL_CMP_ITAV_create, OSSL_CMP_ITAV_set0, OSSL_CMP_ITAV_get0_type, OSSL_CMP_ITAV_get0_value, OSSL_CMP_ITAV_push0_stack_item - OSSL_CMP_ITAV utility functions


#include <openssl/cmp.h>
void OSSL_CMP_ITAV_set0(OSSL_CMP_ITAV *itav, ASN1_OBJECT *type,
                        ASN1_TYPE *value);
ASN1_OBJECT *OSSL_CMP_ITAV_get0_type(const OSSL_CMP_ITAV *itav);
ASN1_TYPE *OSSL_CMP_ITAV_get0_value(const OSSL_CMP_ITAV *itav);

int OSSL_CMP_ITAV_push0_stack_item(STACK_OF(OSSL_CMP_ITAV) **itav_sk_p,
                                   OSSL_CMP_ITAV *itav);


Certificate Management Protocol (CMP, RFC 4210) extension to OpenSSL

ITAV is short for InfoTypeAndValue. This type is defined in RFC 4210 section 5.3.19 and Appendix F. It is used at various places in CMP messages, e.g., in the generalInfo PKIHeader field, to hold a key-value pair.

OSSL_CMP_ITAV_create() creates a new OSSL_CMP_ITAV structure and fills it in. It combines OSSL_CMP_ITAV_new() and OSSL_CMP_ITAV_set0().

OSSL_CMP_ITAV_set0() sets the itav with an infoType of type and an infoValue of value. This function uses the pointers type and value internally, so they must not be freed up after the call.

OSSL_CMP_ITAV_get0_type() returns a direct pointer to the infoType in the itav.

OSSL_CMP_ITAV_get0_value() returns a direct pointer to the infoValue in the itav as generic ASN1_TYPE pointer.

OSSL_CMP_ITAV_push0_stack_item() pushes itav to the stack pointed to by *itav_sk_p. It creates a new stack if *itav_sk_p points to NULL.


CMP is defined in RFC 4210 (and CRMF in RFC 4211).


OSSL_CMP_ITAV_create() returns a pointer to the ITAV structure on success, or NULL on error.

OSSL_CMP_ITAV_set0() does not return a value.

OSSL_CMP_ITAV_get0_type() and OSSL_CMP_ITAV_get0_value() return the respective pointer or NULL if their input is NULL.

OSSL_CMP_ITAV_push0_stack_item() returns 1 on success, 0 on error.


The following code creates and sets a structure representing a generic InfoTypeAndValue sequence, using an OID created from text as type, and an integer as value. Afterwards, it is pushed to the OSSL_CMP_CTX to be later included in the requests' PKIHeader's genInfo field.

ASN1_OBJECT *type = OBJ_txt2obj("", 1);
if (type == NULL) ...

ASN1_INTEGER *asn1int = ASN1_INTEGER_new();
if (asn1int == NULL || !ASN1_INTEGER_set(asn1int, 12345)) ...

ASN1_TYPE *val = ASN1_TYPE_new();
if (val == NULL) ...
ASN1_TYPE_set(val, V_ASN1_INTEGER, asn1int);

OSSL_CMP_ITAV *itav = OSSL_CMP_ITAV_create(type, val);
if (itav == NULL) ...

if (ctx == NULL || !OSSL_CMP_CTX_geninfo_push0_ITAV(ctx, itav)) {
    OSSL_CMP_ITAV_free(itav); /* also frees type and val */
    goto err;


OSSL_CMP_CTX_free(ctx); /* also frees itav */


OSSL_CMP_CTX_new(3), OSSL_CMP_CTX_free(3), ASN1_TYPE_set(3)


The OpenSSL CMP support was added in OpenSSL 3.0.

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Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at