digsig.txt: standardize document format

Each text file under Documentation follows a different
format. Some doesn't even have titles!

Change its representation to follow the adopted standard,
using ReST markups for it to be parseable by Sphinx:

- comment the internal index;
- use the proper markups for titles;
- mark literal blocks.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/digsig.txt b/Documentation/digsig.txt
index 3f682889068bf932052737b57071ce715c851eda..f6a8902d3ef7734a1d93c64136cde40e728730d1 100644 (file)
--- a/Documentation/digsig.txt
+++ b/Documentation/digsig.txt
@@ -1,13 +1,20 @@
+==================================
 Digital Signature Verification API
+==================================
 
-CONTENTS
+:Author: Dmitry Kasatkin
+:Date: 06.10.2011
 
-1. Introduction
-2. API
-3. User-space utilities
 
+.. CONTENTS
 
-1. Introduction
+   1. Introduction
+   2. API
+   3. User-space utilities
+
+
+Introduction
+============
 
 Digital signature verification API provides a method to verify digital signature.
 Currently digital signatures are used by the IMA/EVM integrity protection subsystem.
@@ -17,25 +24,25 @@ GnuPG multi-precision integers (MPI) library. The kernel port provides
 memory allocation errors handling, has been refactored according to kernel
 coding style, and checkpatch.pl reported errors and warnings have been fixed.
 
-Public key and signature consist of header and MPIs.
-
-struct pubkey_hdr {
-       uint8_t         version;        /* key format version */
-       time_t          timestamp;      /* key made, always 0 for now */
-       uint8_t         algo;
-       uint8_t         nmpi;
-       char            mpi[0];
-} __packed;
-
-struct signature_hdr {
-       uint8_t         version;        /* signature format version */
-       time_t          timestamp;      /* signature made */
-       uint8_t         algo;
-       uint8_t         hash;
-       uint8_t         keyid[8];
-       uint8_t         nmpi;
-       char            mpi[0];
-} __packed;
+Public key and signature consist of header and MPIs::
+
+       struct pubkey_hdr {
+               uint8_t         version;        /* key format version */
+               time_t          timestamp;      /* key made, always 0 for now */
+               uint8_t         algo;
+               uint8_t         nmpi;
+               char            mpi[0];
+       } __packed;
+
+       struct signature_hdr {
+               uint8_t         version;        /* signature format version */
+               time_t          timestamp;      /* signature made */
+               uint8_t         algo;
+               uint8_t         hash;
+               uint8_t         keyid[8];
+               uint8_t         nmpi;
+               char            mpi[0];
+       } __packed;
 
 keyid equals to SHA1[12-19] over the total key content.
 Signature header is used as an input to generate a signature.
@@ -43,31 +50,33 @@ Such approach insures that key or signature header could not be changed.
 It protects timestamp from been changed and can be used for rollback
 protection.
 
-2. API
+API
+===
 
-API currently includes only 1 function:
+API currently includes only 1 function::
 
        digsig_verify() - digital signature verification with public key
 
 
-/**
- * digsig_verify() - digital signature verification with public key
- * @keyring:   keyring to search key in
- * @sig:       digital signature
- * @sigen:     length of the signature
- * @data:      data
- * @datalen:   length of the data
- * @return:    0 on success, -EINVAL otherwise
- *
- * Verifies data integrity against digital signature.
- * Currently only RSA is supported.
- * Normally hash of the content is used as a data for this function.
- *
- */
-int digsig_verify(struct key *keyring, const char *sig, int siglen,
-                                               const char *data, int datalen);
-
-3. User-space utilities
+       /**
+       * digsig_verify() - digital signature verification with public key
+       * @keyring:     keyring to search key in
+       * @sig: digital signature
+       * @sigen:       length of the signature
+       * @data:        data
+       * @datalen:     length of the data
+       * @return:      0 on success, -EINVAL otherwise
+       *
+       * Verifies data integrity against digital signature.
+       * Currently only RSA is supported.
+       * Normally hash of the content is used as a data for this function.
+       *
+       */
+       int digsig_verify(struct key *keyring, const char *sig, int siglen,
+                         const char *data, int datalen);
+
+User-space utilities
+====================
 
 The signing and key management utilities evm-utils provide functionality
 to generate signatures, to load keys into the kernel keyring.
@@ -75,22 +84,18 @@ Keys can be in PEM or converted to the kernel format.
 When the key is added to the kernel keyring, the keyid defines the name
 of the key: 5D2B05FC633EE3E8 in the example bellow.
 
-Here is example output of the keyctl utility.
-
-$ keyctl show
-Session Keyring
-       -3 --alswrv      0     0  keyring: _ses
-603976250 --alswrv      0    -1   \_ keyring: _uid.0
-817777377 --alswrv      0     0       \_ user: kmk
-891974900 --alswrv      0     0       \_ encrypted: evm-key
-170323636 --alswrv      0     0       \_ keyring: _module
-548221616 --alswrv      0     0       \_ keyring: _ima
-128198054 --alswrv      0     0       \_ keyring: _evm
-
-$ keyctl list 128198054
-1 key in keyring:
-620789745: --alswrv     0     0 user: 5D2B05FC633EE3E8
-
-
-Dmitry Kasatkin
-06.10.2011
+Here is example output of the keyctl utility::
+
+       $ keyctl show
+       Session Keyring
+       -3 --alswrv      0     0  keyring: _ses
+       603976250 --alswrv      0    -1   \_ keyring: _uid.0
+       817777377 --alswrv      0     0       \_ user: kmk
+       891974900 --alswrv      0     0       \_ encrypted: evm-key
+       170323636 --alswrv      0     0       \_ keyring: _module
+       548221616 --alswrv      0     0       \_ keyring: _ima
+       128198054 --alswrv      0     0       \_ keyring: _evm
+
+       $ keyctl list 128198054
+       1 key in keyring:
+       620789745: --alswrv     0     0 user: 5D2B05FC633EE3E8