222 lines
9.6 KiB
Plaintext
222 lines
9.6 KiB
Plaintext
|
=pod
|
||
|
|
|
||
|
|
=head1 NAME
|
||
|
|
|
||
|
|
life_cycle-digest - The digest algorithm life-cycle
|
||
|
|
|
||
|
|
=head1 DESCRIPTION
|
||
|
|
|
||
|
|
All message digests (MDs) go through a number of stages in their life-cycle:
|
||
|
|
|
||
|
|
=over 4
|
||
|
|
|
||
|
|
=item start
|
||
|
|
|
||
|
|
This state represents the MD before it has been allocated. It is the
|
||
|
|
starting state for any life-cycle transitions.
|
||
|
|
|
||
|
|
=item newed
|
||
|
|
|
||
|
|
This state represents the MD after it has been allocated.
|
||
|
|
|
||
|
|
=item initialised
|
||
|
|
|
||
|
|
This state represents the MD when it is set up and capable of processing
|
||
|
|
input.
|
||
|
|
|
||
|
|
=item updated
|
||
|
|
|
||
|
|
This state represents the MD when it is set up and capable of processing
|
||
|
|
additional input or generating output.
|
||
|
|
|
||
|
|
=item finaled
|
||
|
|
|
||
|
|
This state represents the MD when it has generated output.
|
||
|
|
|
||
|
|
=item freed
|
||
|
|
|
||
|
|
This state is entered when the MD is freed. It is the terminal state
|
||
|
|
for all life-cycle transitions.
|
||
|
|
|
||
|
|
=back
|
||
|
|
|
||
|
|
=head2 State Transition Diagram
|
||
|
|
|
||
|
|
The usual life-cycle of a MD is illustrated:
|
||
|
|
|
||
|
|
=begin man
|
||
|
|
|
||
|
|
+-------------------+
|
||
|
|
| start |
|
||
|
|
+-------------------+
|
||
|
|
|
|
||
|
|
| EVP_MD_CTX_new
|
||
|
|
v
|
||
|
|
+-------------------+ EVP_MD_CTX_reset
|
||
|
|
| newed | <------------------------------+
|
||
|
|
+-------------------+ |
|
||
|
|
| |
|
||
|
|
| EVP_DigestInit |
|
||
|
|
v |
|
||
|
|
+-------------------+ |
|
||
|
|
+--> | initialised | <+ EVP_DigestInit |
|
||
|
|
| +-------------------+ | |
|
||
|
|
| | | EVP_DigestUpdate |
|
||
|
|
| | EVP_DigestUpdate | +------------------+ |
|
||
|
|
| v | v | |
|
||
|
|
| +------------------------------------------------+ |
|
||
|
|
EVP_DigestInit | | updated | --+
|
||
|
|
| +------------------------------------------------+ |
|
||
|
|
| | | |
|
||
|
|
| | EVP_DigestFinal | EVP_DigestFinalXOF |
|
||
|
|
| v v |
|
||
|
|
| +------------------------------------------------+ |
|
||
|
|
+--- | finaled | --+
|
||
|
|
+------------------------------------------------+
|
||
|
|
|
|
||
|
|
| EVP_MD_CTX_free
|
||
|
|
v
|
||
|
|
+-------------------+
|
||
|
|
| freed |
|
||
|
|
+-------------------+
|
||
|
|
|
||
|
|
=end man
|
||
|
|
|
||
|
|
=for html <img src="img/digest.png">
|
||
|
|
|
||
|
|
=head2 Formal State Transitions
|
||
|
|
|
||
|
|
This section defines all of the legal state transitions.
|
||
|
|
This is the canonical list.
|
||
|
|
|
||
|
|
=begin man
|
||
|
|
|
||
|
|
Function Call --------------------- Current State ----------------------
|
||
|
|
start newed initialised updated finaled freed
|
||
|
|
EVP_MD_CTX_new newed
|
||
|
|
EVP_DigestInit initialised initialised initialised initialised
|
||
|
|
EVP_DigestUpdate updated updated
|
||
|
|
EVP_DigestFinal finaled
|
||
|
|
EVP_DigestFinalXOF finaled
|
||
|
|
EVP_MD_CTX_free freed freed freed freed freed
|
||
|
|
EVP_MD_CTX_reset newed newed newed newed
|
||
|
|
EVP_MD_CTX_get_params newed initialised updated
|
||
|
|
EVP_MD_CTX_set_params newed initialised updated
|
||
|
|
EVP_MD_CTX_gettable_params newed initialised updated
|
||
|
|
EVP_MD_CTX_settable_params newed initialised updated
|
||
|
|
|
||
|
|
=end man
|
||
|
|
|
||
|
|
=begin html
|
||
|
|
|
||
|
|
<table style="border:1px solid; border-collapse:collapse">
|
||
|
|
<tr><th style="border:1px solid" align="left">Function Call</th>
|
||
|
|
<th style="border:1px solid" colspan="6">Current State</th></tr>
|
||
|
|
<tr><th style="border:1px solid"></th>
|
||
|
|
<th style="border:1px solid" align="center">start</th>
|
||
|
|
<th style="border:1px solid" align="center">newed</th>
|
||
|
|
<th style="border:1px solid" align="center">initialised</th>
|
||
|
|
<th style="border:1px solid" align="center">updated</th>
|
||
|
|
<th style="border:1px solid" align="center">finaled</th>
|
||
|
|
<th style="border:1px solid" align="center">freed</th></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_MD_CTX_new</th>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_DigestInit</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">initialised</td>
|
||
|
|
<td style="border:1px solid" align="center">initialised</td>
|
||
|
|
<td style="border:1px solid" align="center">initialised</td>
|
||
|
|
<td style="border:1px solid" align="center">initialised</td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_DigestUpdate</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">updated</td>
|
||
|
|
<td style="border:1px solid" align="center">updated</td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_DigestFinal</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">finaled</td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_DigestFinalXOF</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">finaled</td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_MD_CTX_free</th>
|
||
|
|
<td style="border:1px solid" align="center">freed</td>
|
||
|
|
<td style="border:1px solid" align="center">freed</td>
|
||
|
|
<td style="border:1px solid" align="center">freed</td>
|
||
|
|
<td style="border:1px solid" align="center">freed</td>
|
||
|
|
<td style="border:1px solid" align="center">freed</td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_MD_CTX_reset</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_MD_CTX_get_params</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center">initialised</td>
|
||
|
|
<td style="border:1px solid" align="center">updated</td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_MD_CTX_set_params</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center">initialised</td>
|
||
|
|
<td style="border:1px solid" align="center">updated</td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_MD_CTX_gettable_params</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center">initialised</td>
|
||
|
|
<td style="border:1px solid" align="center">updated</td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
<tr><th style="border:1px solid" align="left">EVP_MD_CTX_settable_params</th>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center">newed</td>
|
||
|
|
<td style="border:1px solid" align="center">initialised</td>
|
||
|
|
<td style="border:1px solid" align="center">updated</td>
|
||
|
|
<td style="border:1px solid" align="center"></td>
|
||
|
|
<td style="border:1px solid" align="center"></td></tr>
|
||
|
|
</table>
|
||
|
|
|
||
|
|
=end html
|
||
|
|
|
||
|
|
=head1 NOTES
|
||
|
|
|
||
|
|
At some point the EVP layer will begin enforcing the transitions described
|
||
|
|
herein.
|
||
|
|
|
||
|
|
=head1 SEE ALSO
|
||
|
|
|
||
|
|
L<provider-digest(7)>, L<EVP_DigestInit(3)>
|
||
|
|
|
||
|
|
=head1 COPYRIGHT
|
||
|
|
|
||
|
|
Copyright 2021 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
|