You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
4.1 KiB
121 lines
4.1 KiB
6 years ago
|
'\" t
|
||
|
|
.\" Title: zdigest
|
||
|
|
.\" Author: [see the "AUTHORS" section]
|
||
|
|
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
|
||
|
|
.\" Date: 12/31/2016
|
||
|
|
.\" Manual: CZMQ Manual
|
||
|
|
.\" Source: CZMQ 4.0.2
|
||
|
|
.\" Language: English
|
||
|
|
.\"
|
||
|
|
.TH "ZDIGEST" "3" "12/31/2016" "CZMQ 4\&.0\&.2" "CZMQ Manual"
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" * Define some portability stuff
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
.\" http://bugs.debian.org/507673
|
||
|
|
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
|
||
|
|
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
.ie \n(.g .ds Aq \(aq
|
||
|
|
.el .ds Aq '
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" * set default formatting
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" disable hyphenation
|
||
|
|
.nh
|
||
|
|
.\" disable justification (adjust text to left margin only)
|
||
|
|
.ad l
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.\" * MAIN CONTENT STARTS HERE *
|
||
|
|
.\" -----------------------------------------------------------------
|
||
|
|
.SH "NAME"
|
||
|
|
zdigest \- provides hashing functions (SHA\-1 at present)
|
||
|
|
.SH "SYNOPSIS"
|
||
|
|
.sp
|
||
|
|
.nf
|
||
|
|
// This is a stable class, and may not change except for emergencies\&. It
|
||
|
|
// is provided in stable builds\&.
|
||
|
|
// Constructor \- creates new digest object, which you use to build up a
|
||
|
|
// digest by repeatedly calling zdigest_update() on chunks of data\&.
|
||
|
|
CZMQ_EXPORT zdigest_t *
|
||
|
|
zdigest_new (void);
|
||
|
|
|
||
|
|
// Destroy a digest object
|
||
|
|
CZMQ_EXPORT void
|
||
|
|
zdigest_destroy (zdigest_t **self_p);
|
||
|
|
|
||
|
|
// Add buffer into digest calculation
|
||
|
|
CZMQ_EXPORT void
|
||
|
|
zdigest_update (zdigest_t *self, const byte *buffer, size_t length);
|
||
|
|
|
||
|
|
// Return final digest hash data\&. If built without crypto support,
|
||
|
|
// returns NULL\&.
|
||
|
|
CZMQ_EXPORT const byte *
|
||
|
|
zdigest_data (zdigest_t *self);
|
||
|
|
|
||
|
|
// Return final digest hash size
|
||
|
|
CZMQ_EXPORT size_t
|
||
|
|
zdigest_size (zdigest_t *self);
|
||
|
|
|
||
|
|
// Return digest as printable hex string; caller should not modify nor
|
||
|
|
// free this string\&. After calling this, you may not use zdigest_update()
|
||
|
|
// on the same digest\&. If built without crypto support, returns NULL\&.
|
||
|
|
CZMQ_EXPORT char *
|
||
|
|
zdigest_string (zdigest_t *self);
|
||
|
|
|
||
|
|
// Self test of this class\&.
|
||
|
|
CZMQ_EXPORT void
|
||
|
|
zdigest_test (bool verbose);
|
||
|
|
|
||
|
|
Please add \*(Aq@interface\*(Aq section in \*(Aq\&./\&.\&./src/zdigest\&.c\*(Aq\&.
|
||
|
|
.fi
|
||
|
|
.SH "DESCRIPTION"
|
||
|
|
.sp
|
||
|
|
The zdigest class generates a hash from zchunks of data\&. The current algorithm is SHA\-1, chosen for speed\&. We are aiming to generate a unique digest for a file, and there are no security issues in this use case\&.
|
||
|
|
.sp
|
||
|
|
The current code depends on OpenSSL, which might be replaced by hard coded SHA\-1 implementation to reduce build dependencies\&.
|
||
|
|
.SH "EXAMPLE"
|
||
|
|
.PP
|
||
|
|
\fBFrom zdigest_test method\fR.
|
||
|
|
.sp
|
||
|
|
.if n \{\
|
||
|
|
.RS 4
|
||
|
|
.\}
|
||
|
|
.nf
|
||
|
|
byte *buffer = (byte *) zmalloc (1024);
|
||
|
|
memset (buffer, 0xAA, 1024);
|
||
|
|
|
||
|
|
zdigest_t *digest = zdigest_new ();
|
||
|
|
assert (digest);
|
||
|
|
zdigest_update (digest, buffer, 1024);
|
||
|
|
const byte *data = zdigest_data (digest);
|
||
|
|
assert (data [0] == 0xDE);
|
||
|
|
assert (data [1] == 0xB2);
|
||
|
|
assert (data [2] == 0x38);
|
||
|
|
assert (data [3] == 0x07);
|
||
|
|
assert (streq (zdigest_string (digest),
|
||
|
|
"DEB23807D4FE025E900FE9A9C7D8410C3DDE9671"));
|
||
|
|
zdigest_destroy (&digest);
|
||
|
|
free (buffer);
|
||
|
|
.fi
|
||
|
|
.if n \{\
|
||
|
|
.RE
|
||
|
|
.\}
|
||
|
|
.sp
|
||
|
|
.SH "AUTHORS"
|
||
|
|
.sp
|
||
|
|
The czmq manual was written by the authors in the AUTHORS file\&.
|
||
|
|
.SH "RESOURCES"
|
||
|
|
.sp
|
||
|
|
Main web site: \m[blue]\fB\%\fR\m[]
|
||
|
|
.sp
|
||
|
|
Report bugs to the email <\m[blue]\fBzeromq\-dev@lists\&.zeromq\&.org\fR\m[]\&\s-2\u[1]\d\s+2>
|
||
|
|
.SH "COPYRIGHT"
|
||
|
|
.sp
|
||
|
|
Copyright (c) the Contributors as noted in the AUTHORS file\&. This file is part of CZMQ, the high\-level C binding for 0MQ: http://czmq\&.zeromq\&.org\&. This Source Code Form is subject to the terms of the Mozilla Public License, v\&. 2\&.0\&. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla\&.org/MPL/2\&.0/\&. LICENSE included with the czmq distribution\&.
|
||
|
|
.SH "NOTES"
|
||
|
|
.IP " 1." 4
|
||
|
|
zeromq-dev@lists.zeromq.org
|
||
|
|
.RS 4
|
||
|
|
\%mailto:zeromq-dev@lists.zeromq.org
|
||
|
|
.RE
|