215 lines
9.0 KiB
Plaintext
215 lines
9.0 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
CMS_signed_get_attr_count,
|
|
CMS_signed_get_attr_by_NID, CMS_signed_get_attr_by_OBJ, CMS_signed_get_attr,
|
|
CMS_signed_delete_attr,
|
|
CMS_signed_add1_attr, CMS_signed_add1_attr_by_OBJ,
|
|
CMS_signed_add1_attr_by_NID, CMS_signed_add1_attr_by_txt,
|
|
CMS_signed_get0_data_by_OBJ,
|
|
CMS_unsigned_get_attr_count,
|
|
CMS_unsigned_get_attr_by_NID, CMS_unsigned_get_attr_by_OBJ,
|
|
CMS_unsigned_get_attr, CMS_unsigned_delete_attr,
|
|
CMS_unsigned_add1_attr, CMS_unsigned_add1_attr_by_OBJ,
|
|
CMS_unsigned_add1_attr_by_NID, CMS_unsigned_add1_attr_by_txt,
|
|
CMS_unsigned_get0_data_by_OBJ
|
|
- CMS signed and unsigned attribute functions
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/cms.h>
|
|
|
|
int CMS_signed_get_attr_count(const CMS_SignerInfo *si);
|
|
int CMS_signed_get_attr_by_NID(const CMS_SignerInfo *si, int nid,
|
|
int lastpos);
|
|
int CMS_signed_get_attr_by_OBJ(const CMS_SignerInfo *si, const ASN1_OBJECT *obj,
|
|
int lastpos);
|
|
X509_ATTRIBUTE *CMS_signed_get_attr(const CMS_SignerInfo *si, int loc);
|
|
X509_ATTRIBUTE *CMS_signed_delete_attr(CMS_SignerInfo *si, int loc);
|
|
int CMS_signed_add1_attr(CMS_SignerInfo *si, X509_ATTRIBUTE *attr);
|
|
int CMS_signed_add1_attr_by_OBJ(CMS_SignerInfo *si,
|
|
const ASN1_OBJECT *obj, int type,
|
|
const void *bytes, int len);
|
|
int CMS_signed_add1_attr_by_NID(CMS_SignerInfo *si,
|
|
int nid, int type,
|
|
const void *bytes, int len);
|
|
int CMS_signed_add1_attr_by_txt(CMS_SignerInfo *si,
|
|
const char *attrname, int type,
|
|
const void *bytes, int len);
|
|
void *CMS_signed_get0_data_by_OBJ(const CMS_SignerInfo *si,
|
|
const ASN1_OBJECT *oid,
|
|
int lastpos, int type);
|
|
|
|
int CMS_unsigned_get_attr_count(const CMS_SignerInfo *si);
|
|
int CMS_unsigned_get_attr_by_NID(const CMS_SignerInfo *si, int nid,
|
|
int lastpos);
|
|
int CMS_unsigned_get_attr_by_OBJ(const CMS_SignerInfo *si,
|
|
const ASN1_OBJECT *obj, int lastpos);
|
|
X509_ATTRIBUTE *CMS_unsigned_get_attr(const CMS_SignerInfo *si, int loc);
|
|
X509_ATTRIBUTE *CMS_unsigned_delete_attr(CMS_SignerInfo *si, int loc);
|
|
int CMS_unsigned_add1_attr(CMS_SignerInfo *si, X509_ATTRIBUTE *attr);
|
|
int CMS_unsigned_add1_attr_by_OBJ(CMS_SignerInfo *si,
|
|
const ASN1_OBJECT *obj, int type,
|
|
const void *bytes, int len);
|
|
int CMS_unsigned_add1_attr_by_NID(CMS_SignerInfo *si,
|
|
int nid, int type,
|
|
const void *bytes, int len);
|
|
int CMS_unsigned_add1_attr_by_txt(CMS_SignerInfo *si,
|
|
const char *attrname, int type,
|
|
const void *bytes, int len);
|
|
void *CMS_unsigned_get0_data_by_OBJ(CMS_SignerInfo *si, ASN1_OBJECT *oid,
|
|
int lastpos, int type);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
CMS_signerInfo contains separate attribute lists for signed and unsigned
|
|
attributes. Each CMS_signed_XXX() function is used for signed attributes, and
|
|
each CMS_unsigned_XXX() function is used for unsigned attributes.
|
|
Since the CMS_unsigned_XXX() functions work in the same way as the
|
|
CMS_signed_XXX() equivalents, only the CMS_signed_XXX() functions are
|
|
described below.
|
|
|
|
CMS_signed_get_attr_by_OBJ() finds the location of the first matching object
|
|
I<obj> in the SignerInfo's I<si> signed attribute list. The search starts at the
|
|
position after I<lastpos>. If the returned value is positive then it can be used
|
|
on the next call to CMS_signed_get_attr_by_OBJ() as the value of I<lastpos> in
|
|
order to iterate through the remaining attributes. I<lastpos> can be set to any
|
|
negative value on the first call, in order to start searching from the start of
|
|
the signed attribute list.
|
|
|
|
CMS_signed_get_attr_by_NID() is similar to CMS_signed_get_attr_by_OBJ() except
|
|
that it passes the numerical identifier (NID) I<nid> associated with the object.
|
|
See <openssl/obj_mac.h> for a list of NID_*.
|
|
|
|
CMS_signed_get_attr() returns the B<X509_ATTRIBUTE> object at index I<loc> in the
|
|
I<si> signed attribute list. I<loc> should be in the range from 0 to
|
|
CMS_signed_get_attr_count() - 1.
|
|
|
|
CMS_signed_delete_attr() removes the B<X509_ATTRIBUTE> object at index I<loc> in
|
|
the I<si> signed attribute list. An error occurs if the I<si> attribute list
|
|
is NULL.
|
|
|
|
CMS_signed_add1_attr() pushes a copy of the passed in B<X509_ATTRIBUTE> object
|
|
to the I<si> signed attribute list. A new signed attribute list is created if
|
|
required. An error occurs if I<attr> is NULL.
|
|
|
|
CMS_signed_add1_attr_by_OBJ() creates a new signed B<X509_ATTRIBUTE> using
|
|
X509_ATTRIBUTE_set1_object() and X509_ATTRIBUTE_set1_data() to assign a new
|
|
I<obj> with type I<type> and data I<bytes> of length I<len> and then pushes it
|
|
to the I<key> object's attribute list.
|
|
|
|
CMS_signed_add1_attr_by_NID() is similar to CMS_signed_add1_attr_by_OBJ() except
|
|
that it passes the numerical identifier (NID) I<nid> associated with the object.
|
|
See <openssl/obj_mac.h> for a list of NID_*.
|
|
|
|
CMS_signed_add1_attr_by_txt() is similar to CMS_signed_add1_attr_by_OBJ()
|
|
except that it passes a name I<attrname> associated with the object.
|
|
See <openssl/obj_mac.h> for a list of SN_* names.
|
|
|
|
CMS_signed_get0_data_by_OBJ() finds the first attribute in a I<si> signed
|
|
attributes list that matches the I<obj> starting at index I<lastpos>
|
|
and returns the data retrieved from the found attributes first B<ASN1_TYPE>
|
|
object. An error will occur if the attribute type I<type> does not match the
|
|
type of the B<ASN1_TYPE> object OR if I<type> is either B<V_ASN1_BOOLEAN> or
|
|
B<V_ASN1_NULL> OR the attribute is not found.
|
|
If I<lastpos> is less than -1 then an error will occur if there are multiple
|
|
objects in the signed attribute list that match I<obj>.
|
|
If I<lastpos> is less than -2 then an error will occur if there is more than
|
|
one B<ASN1_TYPE> object in the found signed attribute.
|
|
|
|
Refer to L<X509_ATTRIBUTE(3)> for information related to attributes.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
The CMS_unsigned_XXX() functions return values are similar to those of the
|
|
equivalent CMS_signed_XXX() functions.
|
|
|
|
CMS_signed_get_attr_count() returns the number of signed attributes in the
|
|
SignerInfo I<si>, or -1 if the signed attribute list is NULL.
|
|
|
|
CMS_signed_get_attr_by_OBJ() returns -1 if either the signed attribute list of
|
|
I<si> is empty OR if I<obj> is not found, otherwise it returns the location of
|
|
the I<obj> in the SignerInfo's I<si> signed attribute list.
|
|
|
|
CMS_signed_get_attr_by_NID() is similar to CMS_signed_get_attr_by_OBJ() except
|
|
that it returns -2 if the I<nid> is not known by OpenSSL.
|
|
|
|
CMS_signed_get_attr() returns either a signed B<X509_ATTRIBUTE> or NULL on error.
|
|
|
|
CMS_signed_delete_attr() returns either the removed signed B<X509_ATTRIBUTE> or
|
|
NULL if there is a error.
|
|
|
|
CMS_signed_add1_attr(), CMS_signed_add1_attr_by_OBJ(),
|
|
CMS_signed_add1_attr_by_NID(), CMS_signed_add1_attr_by_txt(),
|
|
return 1 on success or 0 on error.
|
|
|
|
CMS_signed_get0_data_by_OBJ() returns the data retrieved from the found
|
|
signed attributes first B<ASN1_TYPE> object, or NULL if an error occurs.
|
|
|
|
=head1 NOTES
|
|
|
|
Some attributes are added automatically during the signing process.
|
|
|
|
Calling CMS_SignerInfo_sign() adds the NID_pkcs9_signingTime signed
|
|
attribute.
|
|
|
|
Calling CMS_final(), CMS_final_digest() or CMS_dataFinal() adds the
|
|
NID_pkcs9_messageDigest signed attribute.
|
|
|
|
The NID_pkcs9_contentType signed attribute is always added if the
|
|
NID_pkcs9_signingTime attribute is added.
|
|
|
|
Calling CMS_sign_ex(), CMS_sign_receipt() or CMS_add1_signer() may add
|
|
attributes depending on the flags parameter. See L<CMS_add1_signer(3)> for
|
|
more information.
|
|
|
|
OpenSSL applies special rules for the following attribute NIDs:
|
|
|
|
=over 4
|
|
|
|
=item CMS Signed Attributes
|
|
|
|
NID_pkcs9_contentType
|
|
NID_pkcs9_messageDigest
|
|
NID_pkcs9_signingTime
|
|
|
|
=item ESS Signed Attributes
|
|
|
|
NID_id_smime_aa_signingCertificate
|
|
NID_id_smime_aa_signingCertificateV2
|
|
NID_id_smime_aa_receiptRequest
|
|
|
|
=item CMS Unsigned Attributes
|
|
|
|
NID_pkcs9_countersignature
|
|
|
|
=back
|
|
|
|
CMS_signed_add1_attr(), CMS_signed_add1_attr_by_OBJ(),
|
|
CMS_signed_add1_attr_by_NID(), CMS_signed_add1_attr_by_txt()
|
|
and the equivalent CMS_unsigned_add1_attrXXX() functions allow
|
|
duplicate attributes to be added. The attribute rules are not checked
|
|
during these function calls, and are deferred until the sign or verify process
|
|
(i.e. during calls to any of CMS_sign_ex(), CMS_sign(), CMS_sign_receipt(),
|
|
CMS_add1_signer(), CMS_Final(), CMS_dataFinal(), CMS_final_digest(),
|
|
CMS_verify(), CMS_verify_receipt() or CMS_SignedData_verify()).
|
|
|
|
For CMS attribute rules see RFC 5652 Section 11.
|
|
For ESS attribute rules see RFC 2634 Section 1.3.4 and RFC 5035 Section 5.4.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<X509_ATTRIBUTE(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2023-2024 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
|