1ZARMOUR(3)                        CZMQ Manual                       ZARMOUR(3)
2
3
4

NAME

6       zarmour - Class for armoured text encoding and decoding
7

SYNOPSIS

9       //  This is a stable class, and may not change except for emergencies. It
10       //  is provided in stable builds.
11       #define ZARMOUR_MODE_BASE64_STD 0            // Standard base 64
12       #define ZARMOUR_MODE_BASE64_URL 1            // URL and filename friendly base 64
13       #define ZARMOUR_MODE_BASE32_STD 2            // Standard base 32
14       #define ZARMOUR_MODE_BASE32_HEX 3            // Extended hex base 32
15       #define ZARMOUR_MODE_BASE16 4                // Standard base 16
16       #define ZARMOUR_MODE_Z85 5                   // Z85 from ZeroMQ RFC 32
17
18       //  Create a new zarmour
19       CZMQ_EXPORT zarmour_t *
20           zarmour_new (void);
21
22       //  Destroy the zarmour
23       CZMQ_EXPORT void
24           zarmour_destroy (zarmour_t **self_p);
25
26       //  Encode a stream of bytes into an armoured string. Returns the armoured
27       //  string, or NULL if there was insufficient memory available to allocate
28       //  a new string.
29       //  Caller owns return value and must destroy it when done.
30       CZMQ_EXPORT char *
31           zarmour_encode (zarmour_t *self, const byte *data, size_t size);
32
33       //  Decode an armoured string into a chunk. The decoded output is
34       //  null-terminated, so it may be treated as a string, if that's what
35       //  it was prior to encoding.
36       //  Caller owns return value and must destroy it when done.
37       CZMQ_EXPORT zchunk_t *
38           zarmour_decode (zarmour_t *self, const char *data);
39
40       //  Get the mode property.
41       CZMQ_EXPORT int
42           zarmour_mode (zarmour_t *self);
43
44       //  Get printable string for mode.
45       CZMQ_EXPORT const char *
46           zarmour_mode_str (zarmour_t *self);
47
48       //  Set the mode property.
49       CZMQ_EXPORT void
50           zarmour_set_mode (zarmour_t *self, int mode);
51
52       //  Return true if padding is turned on.
53       CZMQ_EXPORT bool
54           zarmour_pad (zarmour_t *self);
55
56       //  Turn padding on or off. Default is on.
57       CZMQ_EXPORT void
58           zarmour_set_pad (zarmour_t *self, bool pad);
59
60       //  Get the padding character.
61       CZMQ_EXPORT char
62           zarmour_pad_char (zarmour_t *self);
63
64       //  Set the padding character.
65       CZMQ_EXPORT void
66           zarmour_set_pad_char (zarmour_t *self, char pad_char);
67
68       //  Return if splitting output into lines is turned on. Default is off.
69       CZMQ_EXPORT bool
70           zarmour_line_breaks (zarmour_t *self);
71
72       //  Turn splitting output into lines on or off.
73       CZMQ_EXPORT void
74           zarmour_set_line_breaks (zarmour_t *self, bool line_breaks);
75
76       //  Get the line length used for splitting lines.
77       CZMQ_EXPORT size_t
78           zarmour_line_length (zarmour_t *self);
79
80       //  Set the line length used for splitting lines.
81       CZMQ_EXPORT void
82           zarmour_set_line_length (zarmour_t *self, size_t line_length);
83
84       //  Print properties of object
85       CZMQ_EXPORT void
86           zarmour_print (zarmour_t *self);
87
88       //  Self test of this class.
89       CZMQ_EXPORT void
90           zarmour_test (bool verbose);
91
92       Please add '@interface' section in './../src/zarmour.c'.
93

DESCRIPTION

95       zarmour - armoured text encoding and decoding
96
97       The zarmour class implements encoding and decoding of armoured text
98       data. The following codecs are implemented: * RFC 4648
99       (http://www.ietf.org/rfc/rfc4648.txt) - base64 - base64url - base32 -
100       base32hex - base16 * Z85 (http://rfc.zeromq.org/spec:32) All RFC4648
101       base64 and base32 variants support padding the output. The pad
102       character is configurable. Default is padding on, with character =.
103       Additionally, in some cases (e.g. MIME), splitting the output into
104       lines of a specific length is required. This feature is also supported,
105       though turned off by default. The z85 mode does neither padding nor
106       line breaks; it is merely a wrapping of the corresponding libzmq
107       methods. Encoding will assert if input length is not divisible by 4 and
108       decoding will assert if input length is not divisible by 5.
109

EXAMPLE

111       From zarmour_test method.
112
113           zarmour_t *self = zarmour_new ();
114           assert (self);
115
116           int mode = zarmour_mode (self);
117           assert (mode == ZARMOUR_MODE_BASE64_STD);
118
119           zarmour_set_mode (self, ZARMOUR_MODE_BASE64_URL);
120           mode = zarmour_mode (self);
121           assert (mode == ZARMOUR_MODE_BASE64_URL);
122
123           assert (zarmour_pad (self));
124           zarmour_set_pad (self, false);
125           assert (!zarmour_pad (self));
126
127           assert (zarmour_pad_char (self) == '=');
128           zarmour_set_pad_char (self, '!');
129           assert (zarmour_pad_char (self) == '!');
130           zarmour_set_pad_char (self, '=');
131           assert (zarmour_pad_char (self) == '=');
132
133           assert (!zarmour_line_breaks (self));
134           zarmour_set_line_breaks (self, true);
135           assert (zarmour_line_breaks (self));
136
137           assert (zarmour_line_length (self) == 72);
138           zarmour_set_line_length (self, 64);
139           assert (zarmour_line_length (self) == 64);
140
141           //  Test against test vectors from RFC4648.
142           zarmour_set_mode (self, ZARMOUR_MODE_BASE64_STD);
143           if (verbose)
144               zarmour_print (self);
145
146           s_armour_test (self, "", "", verbose);
147           s_armour_test (self, "f", "Zg", verbose);
148           s_armour_test (self, "fo", "Zm8", verbose);
149           s_armour_test (self, "foo", "Zm9v", verbose);
150           s_armour_test (self, "foob", "Zm9vYg", verbose);
151           s_armour_test (self, "fooba", "Zm9vYmE", verbose);
152           s_armour_test (self, "foobar", "Zm9vYmFy", verbose);
153           zarmour_set_pad (self, true);
154           if (verbose)
155               zarmour_print (self);
156
157           s_armour_test (self, "", "", verbose);
158           s_armour_test (self, "f", "Zg==", verbose);
159           s_armour_test (self, "fo", "Zm8=", verbose);
160           s_armour_test (self, "foo", "Zm9v", verbose);
161           s_armour_test (self, "foob", "Zm9vYg==", verbose);
162           s_armour_test (self, "fooba", "Zm9vYmE=", verbose);
163           s_armour_test (self, "foobar", "Zm9vYmFy", verbose);
164
165           zarmour_set_pad (self, false);
166           zarmour_set_mode (self, ZARMOUR_MODE_BASE64_URL);
167           if (verbose)
168               zarmour_print (self);
169
170           s_armour_test (self, "", "", verbose);
171           s_armour_test (self, "f", "Zg", verbose);
172           s_armour_test (self, "fo", "Zm8", verbose);
173           s_armour_test (self, "foo", "Zm9v", verbose);
174           s_armour_test (self, "foob", "Zm9vYg", verbose);
175           s_armour_test (self, "fooba", "Zm9vYmE", verbose);
176           s_armour_test (self, "foobar", "Zm9vYmFy", verbose);
177           zarmour_set_pad (self, true);
178           if (verbose)
179               zarmour_print (self);
180
181           s_armour_test (self, "", "", verbose);
182           s_armour_test (self, "f", "Zg==", verbose);
183           s_armour_test (self, "fo", "Zm8=", verbose);
184           s_armour_test (self, "foo", "Zm9v", verbose);
185           s_armour_test (self, "foob", "Zm9vYg==", verbose);
186           s_armour_test (self, "fooba", "Zm9vYmE=", verbose);
187           s_armour_test (self, "foobar", "Zm9vYmFy", verbose);
188
189           zarmour_set_pad (self, false);
190           zarmour_set_mode (self, ZARMOUR_MODE_BASE32_STD);
191           if (verbose)
192               zarmour_print (self);
193
194           s_armour_test (self, "", "", verbose);
195           s_armour_test (self, "f", "MY", verbose);
196           s_armour_test (self, "fo", "MZXQ", verbose);
197           s_armour_test (self, "foo", "MZXW6", verbose);
198           s_armour_test (self, "foob", "MZXW6YQ", verbose);
199           s_armour_test (self, "fooba", "MZXW6YTB", verbose);
200           s_armour_test (self, "foobar", "MZXW6YTBOI", verbose);
201           s_armour_decode (self, "my", "f", verbose);
202           s_armour_decode (self, "mzxq", "fo", verbose);
203           s_armour_decode (self, "mzxw6", "foo", verbose);
204           s_armour_decode (self, "mzxw6yq", "foob", verbose);
205           s_armour_decode (self, "mzxw6ytb", "fooba", verbose);
206           s_armour_decode (self, "mzxw6ytboi", "foobar", verbose);
207           zarmour_set_pad (self, true);
208           if (verbose)
209               zarmour_print (self);
210
211           s_armour_test (self, "", "", verbose);
212           s_armour_test (self, "f", "MY======", verbose);
213           s_armour_test (self, "fo", "MZXQ====", verbose);
214           s_armour_test (self, "foo", "MZXW6===", verbose);
215           s_armour_test (self, "foob", "MZXW6YQ=", verbose);
216           s_armour_test (self, "fooba", "MZXW6YTB", verbose);
217           s_armour_test (self, "foobar", "MZXW6YTBOI======", verbose);
218           s_armour_decode (self, "my======", "f", verbose);
219           s_armour_decode (self, "mzxq====", "fo", verbose);
220           s_armour_decode (self, "mzxw6===", "foo", verbose);
221           s_armour_decode (self, "mzxw6yq=", "foob", verbose);
222           s_armour_decode (self, "mzxw6ytb", "fooba", verbose);
223           s_armour_decode (self, "mzxw6ytboi======", "foobar", verbose);
224
225           zarmour_set_pad (self, false);
226           zarmour_set_mode (self, ZARMOUR_MODE_BASE32_HEX);
227           if (verbose)
228               zarmour_print (self);
229
230           s_armour_test (self, "", "", verbose);
231           s_armour_test (self, "f", "CO", verbose);
232           s_armour_test (self, "fo", "CPNG", verbose);
233           s_armour_test (self, "foo", "CPNMU", verbose);
234           s_armour_test (self, "foob", "CPNMUOG", verbose);
235           s_armour_test (self, "fooba", "CPNMUOJ1", verbose);
236           s_armour_test (self, "foobar", "CPNMUOJ1E8", verbose);
237           s_armour_decode (self, "co", "f", verbose);
238           s_armour_decode (self, "cpng", "fo", verbose);
239           s_armour_decode (self, "cpnmu", "foo", verbose);
240           s_armour_decode (self, "cpnmuog", "foob", verbose);
241           s_armour_decode (self, "cpnmuoj1", "fooba", verbose);
242           s_armour_decode (self, "cpnmuoj1e8", "foobar", verbose);
243           zarmour_set_pad (self, true);
244           if (verbose)
245               zarmour_print (self);
246
247           s_armour_test (self, "", "", verbose);
248           s_armour_test (self, "f", "CO======", verbose);
249           s_armour_test (self, "fo", "CPNG====", verbose);
250           s_armour_test (self, "foo", "CPNMU===", verbose);
251           s_armour_test (self, "foob", "CPNMUOG=", verbose);
252           s_armour_test (self, "fooba", "CPNMUOJ1", verbose);
253           s_armour_test (self, "foobar", "CPNMUOJ1E8======", verbose);
254           s_armour_decode (self, "co======", "f", verbose);
255           s_armour_decode (self, "cpng====", "fo", verbose);
256           s_armour_decode (self, "cpnmu===", "foo", verbose);
257           s_armour_decode (self, "cpnmuog=", "foob", verbose);
258           s_armour_decode (self, "cpnmuoj1", "fooba", verbose);
259           s_armour_decode (self, "cpnmuoj1e8======", "foobar", verbose);
260           zarmour_set_pad (self, true);
261
262           zarmour_set_mode (self, ZARMOUR_MODE_BASE16);
263           if (verbose)
264               zarmour_print (self);
265
266           s_armour_test (self, "", "", verbose);
267           s_armour_test (self, "f", "66", verbose);
268           s_armour_test (self, "fo", "666F", verbose);
269           s_armour_test (self, "foo", "666F6F", verbose);
270           s_armour_test (self, "foob", "666F6F62", verbose);
271           s_armour_test (self, "fooba", "666F6F6261", verbose);
272           s_armour_test (self, "foobar", "666F6F626172", verbose);
273           s_armour_decode (self, "666f", "fo", verbose);
274           s_armour_decode (self, "666f6f", "foo", verbose);
275           s_armour_decode (self, "666f6f62", "foob", verbose);
276           s_armour_decode (self, "666f6f6261", "fooba", verbose);
277           s_armour_decode (self, "666f6f626172", "foobar", verbose);
278
279           #ifdef _INCLUDE_Z85
280           //  Z85 test is homemade; using 0, 4 and 8 bytes, with precalculated
281           //  test vectors created with a libzmq test.
282           //  ----------------------------------------------------------------
283
284           //  Make a fake curve key from hex (base16) string, making sure
285           //  there are no null bytes inside, so we can use our test utility
286           zarmour_set_mode (self, ZARMOUR_MODE_BASE16);
287           zarmour_set_line_breaks (self, false);
288
289           zchunk_t *chunk = zarmour_decode (self,
290               "4E6F87E2FB6EB22A1EF5E257B75D79124949565F0B8B36A878A4F03111C96E0B");
291           assert (chunk);
292
293           zarmour_set_mode (self, ZARMOUR_MODE_Z85);  //  Z85 mode does not support padding or line breaks
294           zarmour_set_pad (self, false);              //  so these two are superfluous;
295           zarmour_set_line_breaks (self, false);      //  just for consistency
296           if (verbose)
297               zarmour_print (self);
298
299           s_armour_test (self, "", "", verbose);
300           s_armour_test (self, "foob", "w]zP%", verbose);
301           s_armour_test (self, "foobar!!", "w]zP%vr9Im", verbose);
302           s_armour_test (self, (char *) zchunk_data (chunk),
303                          "ph+{E}!&X?9}!I]W{sm(nL8@&3Yu{wC+<*-5Y[[#", verbose);
304           zchunk_destroy (&chunk);
305           #endif
306
307           //  Armouring longer byte array to test line breaks
308           zarmour_set_pad (self, true);
309           zarmour_set_line_breaks (self, true);
310           byte test_data [256];
311           int index;
312           for (index = 0; index < 256; index++)
313               test_data [index] = index;
314
315           zarmour_set_mode (self, ZARMOUR_MODE_BASE64_STD);
316           s_armour_test_long (self, test_data, 256, verbose);
317           zarmour_set_mode (self, ZARMOUR_MODE_BASE64_URL);
318           s_armour_test_long (self, test_data, 256, verbose);
319           zarmour_set_mode (self, ZARMOUR_MODE_BASE32_STD);
320           s_armour_test_long (self, test_data, 256, verbose);
321           zarmour_set_mode (self, ZARMOUR_MODE_BASE32_HEX);
322           s_armour_test_long (self, test_data, 256, verbose);
323           zarmour_set_mode (self, ZARMOUR_MODE_BASE16);
324           s_armour_test_long (self, test_data, 256, verbose);
325           #ifdef _INCLUDE_Z85
326           zarmour_set_mode (self, ZARMOUR_MODE_Z85);
327           s_armour_test_long (self, test_data, 256, verbose);
328           #endif
329
330           zarmour_destroy (&self);
331
332           #if defined (__WINDOWS__)
333           zsys_shutdown();
334           #endif
335
336

AUTHORS

338       The czmq manual was written by the authors in the AUTHORS file.
339

RESOURCES

341       Main web site:
342
343       Report bugs to the email <zeromq-dev@lists.zeromq.org[1]>
344
346       Copyright (c) the Contributors as noted in the AUTHORS file. This file
347       is part of CZMQ, the high-level C binding for 0MQ:
348       http://czmq.zeromq.org. This Source Code Form is subject to the terms
349       of the Mozilla Public License, v. 2.0. If a copy of the MPL was not
350       distributed with this file, You can obtain one at
351       http://mozilla.org/MPL/2.0/. LICENSE included with the czmq
352       distribution.
353

NOTES

355        1. zeromq-dev@lists.zeromq.org
356           mailto:zeromq-dev@lists.zeromq.org
357
358
359
360CZMQ 4.2.1                        10/31/2019                        ZARMOUR(3)
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