NAME

       OSSL_CMP_MSG_get0_header, OSSL_CMP_MSG_get_bodytype, OSSL_CMP_MSG_update_transactionID,
       OSSL_CMP_CTX_setup_CRM, OSSL_CMP_MSG_read, OSSL_CMP_MSG_write, d2i_OSSL_CMP_MSG_bio,
       i2d_OSSL_CMP_MSG_bio - function(s) manipulating CMP messages

SYNOPSIS

         #include <openssl/cmp.h>

         OSSL_CMP_PKIHEADER *OSSL_CMP_MSG_get0_header(const OSSL_CMP_MSG *msg);
         int OSSL_CMP_MSG_get_bodytype(const OSSL_CMP_MSG *msg);
         int OSSL_CMP_MSG_update_transactionID(OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg);
         OSSL_CRMF_MSG *OSSL_CMP_CTX_setup_CRM(OSSL_CMP_CTX *ctx, int for_KUR, int rid);
         OSSL_CMP_MSG *OSSL_CMP_MSG_read(const char *file, OSSL_LIB_CTX *libctx, const char *propq);
         int OSSL_CMP_MSG_write(const char *file, const OSSL_CMP_MSG *msg);
         OSSL_CMP_MSG *d2i_OSSL_CMP_MSG_bio(BIO *bio, OSSL_CMP_MSG **msg);
         int i2d_OSSL_CMP_MSG_bio(BIO *bio, const OSSL_CMP_MSG *msg);

DESCRIPTION

       OSSL_CMP_MSG_get0_header() returns the header of the given CMP message.

       OSSL_CMP_MSG_get_bodytype() returns the body type of the given CMP message.

       OSSL_CMP_MSG_update_transactionID() updates the transactionID field in the header of the
       given message according to the CMP_CTX.  This requires re-protecting the message (if it
       was protected).

       OSSL_CMP_CTX_setup_CRM() creates a CRMF certificate request message from various
       information provided in the CMP context argument ctx for inclusion in a CMP request
       message based on details contained in ctx.  The rid argument defines the request
       identifier to use, which typically is 0.

       The subject DN to include in the certificate template is determined as follows.  If ctx
       includes a subject name set via OSSL_CMP_CTX_set1_subjectName(3), this name is used.
       Otherwise, if a PKCS#10 CSR is given in ctx, its subject is used.  Otherwise, if a
       reference certificate is given in ctx (see OSSL_CMP_CTX_set1_oldCert(3)), its subject is
       used if for_KUR is nonzero or the ctx does not include a Subject Alternative Name.

       The public key to include is taken from any value set via OSSL_CMP_CTX_set0_newPkey(3),
       otherwise the public key of any PKCS#10 CSR is given in ctx, otherwise the public key of
       any reference certificate given in ctx, otherwise it is derived from the client private
       key if given in ctx.

       The set of X.509 extensions to include is computed as follows.  If a PKCS#10 CSR is
       present in ctx, default extensions are taken from there, otherwise the empty set is taken
       as the initial value.  If there is a reference certificate in ctx and contains Subject
       Alternative Names (SANs) and OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT is not set, these
       override any SANs from the PKCS#10 CSR.  The extensions are further augmented or
       overridden by any extensions with the same OIDs included in the ctx via
       OSSL_CMP_CTX_set0_reqExtensions(3).  The SANs are further overridden by any SANs included
       in ctx via OSSL_CMP_CTX_push1_subjectAltName(3).  Finally, policies are overridden by any
       policies included in ctx via OSSL_CMP_CTX_push0_policy(3).

       OSSL_CMP_CTX_setup_CRM() also sets the sets the regToken control oldCertID for KUR
       messages using the issuer name and serial number of the reference certificate, if present.

       OSSL_CMP_MSG_read() loads a DER-encoded OSSL_CMP_MSG from file.

       OSSL_CMP_MSG_write() stores the given OSSL_CMP_MSG to file in DER encoding.

       d2i_OSSL_CMP_MSG_bio() parses an ASN.1-encoded OSSL_CMP_MSG from the BIO bio.  It assigns
       a pointer to the new structure to *msg if msg is not NULL.

       i2d_OSSL_CMP_MSG_bio() writes the OSSL_CMP_MSG msg in ASN.1 encoding to BIO bio.

NOTES

       CMP is defined in RFC 4210.

RETURN VALUES

       OSSL_CMP_MSG_get0_header() returns the intended pointer value as described above or NULL
       if the respective entry does not exist and on error.

       OSSL_CMP_MSG_get_bodytype() returns the body type or -1 on error.

       OSSL_CMP_CTX_setup_CRM() returns a pointer to a OSSL_CRMF_MSG on success, NULL on error.

       d2i_OSSL_CMP_MSG_bio() returns the parsed message or NULL on error.

       OSSL_CMP_MSG_read() and d2i_OSSL_CMP_MSG_bio() return the parsed CMP message or NULL on
       error.

       OSSL_CMP_MSG_write() and i2d_OSSL_CMP_MSG_bio() return the number of bytes successfully
       encoded or a negative value if an error occurs.

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

HISTORY

       The OpenSSL CMP support was added in OpenSSL 3.0.

COPYRIGHT

       Copyright 2007-2022 The OpenSSL Project Authors. All Rights Reserved.

       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 <https://www.openssl.org/source/license.html>.