X509: Rename X509_set0_sm2_id() and friends

- X509_set0_sm2_id() -> X509_set0_distinguishing_id()
- X509_get0_sm2_id() -> X509_get0_distinguishing_id()
- X509_REQ_set0_sm2_id -> X509_REQ_set0_distinguishing_id()
- X509_REQ_get0_sm2_id -> X509_REQ_get0_distinguishing_id()

The reason for this rename is that the SM2 ID isn't really a unique
SM2 data item, but rather a re-use of the Distinguished that is
defined in ISO/IEC 15946-3 as well as in FIPS 196, with no special
attribution toward any algorithm in particular.

Fixes #11293

Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
(Merged from https://github.com/openssl/openssl/pull/11302)

2 files changed, 71 insertions, 55 deletions

diff --git a/doc/man3/X509_get0_distinguishing_id.pod b/doc/man3/X509_get0_distinguishing_id.pod
new file mode 100644
index 0000000000..2dd06e716d
--- /dev/null
+++ b/doc/man3/X509_get0_distinguishing_id.pod
@@ -0,0 +1,71 @@
+=pod
+
+=head1 NAME
+
+X509_get0_distinguishing_id, X509_set0_distinguishing_id,
+X509_REQ_get0_distinguishing_id, X509_REQ_set0_distinguishing_id
+- get or set the Distinguishing ID for certificate operations
+
+=head1 SYNOPSIS
+
+ #include <openssl/x509.h>
+
+ ASN1_OCTET_STRING *X509_get0_distinguishing_id(X509 *x);
+ void X509_set0_distinguishing_id(X509 *x, ASN1_OCTET_STRING *distid);
+ ASN1_OCTET_STRING *X509_REQ_get0_distinguishing_id(X509_REQ *x);
+ void X509_REQ_set0_distinguishing_id(X509_REQ *x, ASN1_OCTET_STRING *distid);
+
+=head1 DESCRIPTION
+
+The Distinguishing ID is defined in FIPS 196 as follows:
+
+=over 4
+
+I<Distinguishing  identifier>: information which unambiguously distinguishes
+an entity in the authentication process.
+
+=back
+
+The SM2 signature algorithm requires a Distinguishing ID value when generating
+and verifying a signature, but the Ddistinguishing ID may also find other uses.
+In the context of SM2, the Distinguishing ID is often referred to as the "SM2
+ID".
+
+For the purpose off verifying a certificate or a certification request, a
+Distinguishing ID may be attached to it, so functions like L<X509_verify(3)>
+or L<X509_REQ_verify(3)> have easy access to that identity for signature
+verification.
+
+X509_get0_distinguishing_id() gets the Distinguishing ID value of a certificate
+B<x> by returning an B<ASN1_OCTET_STRING> object which should not be freed by
+the caller.
+
+X509_set0_distinguishing_id() assigns B<distid> to the certificate B<x>.
+Calling this function transfers the memory management of the value to the X509
+object, and therefore the value that has been passed in should not be freed by
+the caller after this function has been called.
+
+X509_REQ_get0_distinguishing_id() and X509_REQ_set0_distinguishing_id()
+have the same functionality as X509_get0_distinguishing_id() and
+X509_set0_distinguishing_id() except that they deal with  B<X509_REQ>
+objects instead of B<X509>.
+
+=head1 RETURN VALUES
+
+X509_set0_distinguishing_id() and X509_REQ_set0_distinguishing_id() do not
+return a value.
+
+=head1 SEE ALSO
+
+L<X509_verify(3)>, L<SM2(7)>
+
+=head1 COPYRIGHT
+
+Copyright 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
diff --git a/doc/man3/X509_get0_sm2_id.pod b/doc/man3/X509_get0_sm2_id.pod
deleted file mode 100644
index d8a85d7f8b..0000000000
--- a/doc/man3/X509_get0_sm2_id.pod
+++ /dev/null
@@ -1,55 +0,0 @@
-=pod
-
-=head1 NAME
-
-X509_get0_sm2_id, X509_set0_sm2_id,
-X509_REQ_get0_sm2_id, X509_REQ_set0_sm2_id
-- get or set SM2 ID for certificate operations
-
-=head1 SYNOPSIS
-
- #include <openssl/x509.h>
-
- ASN1_OCTET_STRING *X509_get0_sm2_id(X509 *x);
- void X509_set0_sm2_id(X509 *x, ASN1_OCTET_STRING *sm2_id);
- ASN1_OCTET_STRING *X509_REQ_get0_sm2_id(X509_REQ *x);
- void X509_REQ_set0_sm2_id(X509_REQ *x, ASN1_OCTET_STRING *sm2_id);
-
-=head1 DESCRIPTION
-
-X509_get0_sm2_id() gets the ID value of an SM2 certificate B<x> by returning an
-B<ASN1_OCTET_STRING> object which should not be freed by the caller.
-
-X509_set0_sm2_id() sets the B<sm2_id> value to an SM2 certificate B<x>. Calling
-this function transfers the memory management of the value to the X509 object,
-and therefore the value that has been passed in should not be freed by the
-caller after this function has been called.
-
-X509_REQ_get0_sm2_id() and X509_REQ_set0_sm2_id() have the same functionality
-as X509_get0_sm2_id() and X509_set0_sm2_id() except that they deal with
-B<X509_REQ> objects instead of B<X509>.
-
-=head1 NOTES
-
-SM2 signature algorithm requires an ID value when generating and verifying a
-signature. The functions described in this manual provide the user with the
-ability to set and retrieve the SM2 ID value.
-
-=head1 RETURN VALUES
-
-X509_set0_sm2_id() and X509_REQ_set0_sm2_id() do not return a value.
-
-=head1 SEE ALSO
-
-L<X509_verify(3)>, L<SM2(7)>
-
-=head1 COPYRIGHT
-
-Copyright 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