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

Also includes CRMF (RFC 4211) and HTTP transfer (RFC 6712)

CMP and CRMF API is added to libcrypto, and the "cmp" app to the openssl CLI.
    Adds extensive man pages and tests.  Integration into build scripts.

Incremental pull request based on OpenSSL commit 1362190b1b78 of 2018-09-26

3rd chunk: CMP ASN.1 structures (in crypto/cmp/cmp_asn.c) and related files

Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8669)

1 files changed, 105 insertions, 0 deletions

diff --git a/doc/man3/OSSL_CMP_ITAV_set0.pod b/doc/man3/OSSL_CMP_ITAV_set0.pod
new file mode 100644
index 0000000000..082b0bfe76
--- /dev/null
+++ b/doc/man3/OSSL_CMP_ITAV_set0.pod
@@ -0,0 +1,105 @@
+=pod
+
+=head1 NAME
+
+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
+
+=head1 SYNOPSIS
+
+  #include <openssl/cmp.h>
+  OSSL_CMP_ITAV *OSSL_CMP_ITAV_create(ASN1_OBJECT *type, ASN1_TYPE *value);
+  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);
+
+=head1 DESCRIPTION
+
+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 B<OSSL_CMP_ITAV_new()> and B<OSSL_CMP_ITAV_set0>.
+
+OSSL_CMP_ITAV_set0() sets the B<itav> with an infoType of B<type> and an
+infoValue of B<value>. This function uses the pointers B<type> and B<value>
+internally, so they must B<not> be freed up after the call.
+
+OSSL_CMP_ITAV_get0_type() returns a direct pointer to the infoType in the
+B<itav>.
+
+OSSL_CMP_ITAV_get0_value() returns a direct pointer to the infoValue in
+the B<itav> as generic ASN1_TYPE*.
+
+OSSL_CMP_ITAV_push0_stack_item() pushes B<itav> to the stack pointed to
+by B<*itav_sk_p>. It creates a new stack if B<*itav_sk_p> points to NULL.
+
+=head1 NOTES
+
+CMP is defined in RFC 4210 (and CRMF in RFC 4211).
+
+=head1 RETURN VALUES
+
+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.
+
+=head1 EXAMPLE
+
+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("1.2.3.4.5", 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) ...
+
+    OSSL_CMP_CTX *ctx = OSSL_CMP_CTX_new();
+    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 */
+
+=head1 SEE ALSO
+
+L<OSSL_CMP_CTX_new(3)>, L<OSSL_CMP_CTX_free(3)>, L<ASN1_TYPE_set(3)>
+
+=head1 COPYRIGHT
+
+Copyright 2007-2019 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
+L<https://www.openssl.org/source/license.html>.
+
+=cut