ZARMOUR(3)

NAME
zarmour - armoured text encoding and decoding

SYNOPSIS

//  This is a stable class, and may not change except for emergencies. It
//  is provided in stable builds.
#define ZARMOUR_MODE_BASE64_STD 0           // Standard base 64
#define ZARMOUR_MODE_BASE64_URL 1           // URL and filename friendly base 64
#define ZARMOUR_MODE_BASE32_STD 2           // Standard base 32
#define ZARMOUR_MODE_BASE32_HEX 3           // Extended hex base 32
#define ZARMOUR_MODE_BASE16 4               // Standard base 16
#define ZARMOUR_MODE_Z85 5                  // Z85 from ZeroMQ RFC 32
//  Create a new zarmour
CZMQ_EXPORT zarmour_t *
    zarmour_new (void);
//  Destroy the zarmour
CZMQ_EXPORT void
    zarmour_destroy (zarmour_t **self_p);
//  Encode a stream of bytes into an armoured string. Returns the armoured
//  string, or NULL if there was insufficient memory available to allocate
//  a new string.
//  Caller owns return value and must destroy it when done.
CZMQ_EXPORT char *
    zarmour_encode (zarmour_t *self, const byte *data, size_t size);
//  Decode an armoured string into a chunk. The decoded output is
//  null-terminated, so it may be treated as a string, if that's what
//  it was prior to encoding.
//  Caller owns return value and must destroy it when done.
CZMQ_EXPORT zchunk_t *
    zarmour_decode (zarmour_t *self, const char *data);
//  Get the mode property.
CZMQ_EXPORT int
    zarmour_mode (zarmour_t *self);
//  Get printable string for mode.
CZMQ_EXPORT const char *
    zarmour_mode_str (zarmour_t *self);
//  Set the mode property.
CZMQ_EXPORT void
    zarmour_set_mode (zarmour_t *self, int mode);
//  Return true if padding is turned on.
CZMQ_EXPORT bool
    zarmour_pad (zarmour_t *self);
//  Turn padding on or off. Default is on.
CZMQ_EXPORT void
    zarmour_set_pad (zarmour_t *self, bool pad);
//  Get the padding character.
CZMQ_EXPORT char
    zarmour_pad_char (zarmour_t *self);
//  Set the padding character.
CZMQ_EXPORT void
    zarmour_set_pad_char (zarmour_t *self, char pad_char);
//  Return if splitting output into lines is turned on. Default is off.
CZMQ_EXPORT bool
    zarmour_line_breaks (zarmour_t *self);
//  Turn splitting output into lines on or off.
CZMQ_EXPORT void
    zarmour_set_line_breaks (zarmour_t *self, bool line_breaks);
//  Get the line length used for splitting lines.
CZMQ_EXPORT size_t
    zarmour_line_length (zarmour_t *self);
//  Set the line length used for splitting lines.
CZMQ_EXPORT void
    zarmour_set_line_length (zarmour_t *self, size_t line_length);
//  Print properties of object
CZMQ_EXPORT void
    zarmour_print (zarmour_t *self);
//  Self test of this class.
CZMQ_EXPORT void
    zarmour_test (bool verbose);
Please add '@interface' section in './../src/zarmour.c'.

DESCRIPTION

zarmour - armoured text encoding and decoding

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

EXAMPLE

From zarmour_test method.

    zarmour_t *self = zarmour_new ();
    assert (self);
    int mode = zarmour_mode (self);
    assert (mode == ZARMOUR_MODE_BASE64_STD);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE64_URL);
    mode = zarmour_mode (self);
    assert (mode == ZARMOUR_MODE_BASE64_URL);
    assert (zarmour_pad (self));
    zarmour_set_pad (self, false);
    assert (!zarmour_pad (self));
    assert (zarmour_pad_char (self) == '=');
    zarmour_set_pad_char (self, '!');
    assert (zarmour_pad_char (self) == '!');
    zarmour_set_pad_char (self, '=');
    assert (zarmour_pad_char (self) == '=');
    assert (!zarmour_line_breaks (self));
    zarmour_set_line_breaks (self, true);
    assert (zarmour_line_breaks (self));
    assert (zarmour_line_length (self) == 72);
    zarmour_set_line_length (self, 64);
    assert (zarmour_line_length (self) == 64);
    //  Test against test vectors from RFC4648.
    zarmour_set_mode (self, ZARMOUR_MODE_BASE64_STD);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "Zg", verbose);
    s_armour_test (self, "fo", "Zm8", verbose);
    s_armour_test (self, "foo", "Zm9v", verbose);
    s_armour_test (self, "foob", "Zm9vYg", verbose);
    s_armour_test (self, "fooba", "Zm9vYmE", verbose);
    s_armour_test (self, "foobar", "Zm9vYmFy", verbose);
    zarmour_set_pad (self, true);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "Zg==", verbose);
    s_armour_test (self, "fo", "Zm8=", verbose);
    s_armour_test (self, "foo", "Zm9v", verbose);
    s_armour_test (self, "foob", "Zm9vYg==", verbose);
    s_armour_test (self, "fooba", "Zm9vYmE=", verbose);
    s_armour_test (self, "foobar", "Zm9vYmFy", verbose);
    zarmour_set_pad (self, false);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE64_URL);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "Zg", verbose);
    s_armour_test (self, "fo", "Zm8", verbose);
    s_armour_test (self, "foo", "Zm9v", verbose);
    s_armour_test (self, "foob", "Zm9vYg", verbose);
    s_armour_test (self, "fooba", "Zm9vYmE", verbose);
    s_armour_test (self, "foobar", "Zm9vYmFy", verbose);
    zarmour_set_pad (self, true);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "Zg==", verbose);
    s_armour_test (self, "fo", "Zm8=", verbose);
    s_armour_test (self, "foo", "Zm9v", verbose);
    s_armour_test (self, "foob", "Zm9vYg==", verbose);
    s_armour_test (self, "fooba", "Zm9vYmE=", verbose);
    s_armour_test (self, "foobar", "Zm9vYmFy", verbose);
    zarmour_set_pad (self, false);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE32_STD);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "MY", verbose);
    s_armour_test (self, "fo", "MZXQ", verbose);
    s_armour_test (self, "foo", "MZXW6", verbose);
    s_armour_test (self, "foob", "MZXW6YQ", verbose);
    s_armour_test (self, "fooba", "MZXW6YTB", verbose);
    s_armour_test (self, "foobar", "MZXW6YTBOI", verbose);
    s_armour_decode (self, "my", "f", verbose);
    s_armour_decode (self, "mzxq", "fo", verbose);
    s_armour_decode (self, "mzxw6", "foo", verbose);
    s_armour_decode (self, "mzxw6yq", "foob", verbose);
    s_armour_decode (self, "mzxw6ytb", "fooba", verbose);
    s_armour_decode (self, "mzxw6ytboi", "foobar", verbose);
    zarmour_set_pad (self, true);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "MY======", verbose);
    s_armour_test (self, "fo", "MZXQ====", verbose);
    s_armour_test (self, "foo", "MZXW6===", verbose);
    s_armour_test (self, "foob", "MZXW6YQ=", verbose);
    s_armour_test (self, "fooba", "MZXW6YTB", verbose);
    s_armour_test (self, "foobar", "MZXW6YTBOI======", verbose);
    s_armour_decode (self, "my======", "f", verbose);
    s_armour_decode (self, "mzxq====", "fo", verbose);
    s_armour_decode (self, "mzxw6===", "foo", verbose);
    s_armour_decode (self, "mzxw6yq=", "foob", verbose);
    s_armour_decode (self, "mzxw6ytb", "fooba", verbose);
    s_armour_decode (self, "mzxw6ytboi======", "foobar", verbose);
    zarmour_set_pad (self, false);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE32_HEX);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "CO", verbose);
    s_armour_test (self, "fo", "CPNG", verbose);
    s_armour_test (self, "foo", "CPNMU", verbose);
    s_armour_test (self, "foob", "CPNMUOG", verbose);
    s_armour_test (self, "fooba", "CPNMUOJ1", verbose);
    s_armour_test (self, "foobar", "CPNMUOJ1E8", verbose);
    s_armour_decode (self, "co", "f", verbose);
    s_armour_decode (self, "cpng", "fo", verbose);
    s_armour_decode (self, "cpnmu", "foo", verbose);
    s_armour_decode (self, "cpnmuog", "foob", verbose);
    s_armour_decode (self, "cpnmuoj1", "fooba", verbose);
    s_armour_decode (self, "cpnmuoj1e8", "foobar", verbose);
    zarmour_set_pad (self, true);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "CO======", verbose);
    s_armour_test (self, "fo", "CPNG====", verbose);
    s_armour_test (self, "foo", "CPNMU===", verbose);
    s_armour_test (self, "foob", "CPNMUOG=", verbose);
    s_armour_test (self, "fooba", "CPNMUOJ1", verbose);
    s_armour_test (self, "foobar", "CPNMUOJ1E8======", verbose);
    s_armour_decode (self, "co======", "f", verbose);
    s_armour_decode (self, "cpng====", "fo", verbose);
    s_armour_decode (self, "cpnmu===", "foo", verbose);
    s_armour_decode (self, "cpnmuog=", "foob", verbose);
    s_armour_decode (self, "cpnmuoj1", "fooba", verbose);
    s_armour_decode (self, "cpnmuoj1e8======", "foobar", verbose);
    zarmour_set_pad (self, true);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE16);
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "f", "66", verbose);
    s_armour_test (self, "fo", "666F", verbose);
    s_armour_test (self, "foo", "666F6F", verbose);
    s_armour_test (self, "foob", "666F6F62", verbose);
    s_armour_test (self, "fooba", "666F6F6261", verbose);
    s_armour_test (self, "foobar", "666F6F626172", verbose);
    s_armour_decode (self, "666f", "fo", verbose);
    s_armour_decode (self, "666f6f", "foo", verbose);
    s_armour_decode (self, "666f6f62", "foob", verbose);
    s_armour_decode (self, "666f6f6261", "fooba", verbose);
    s_armour_decode (self, "666f6f626172", "foobar", verbose);
    #ifdef _INCLUDE_Z85
    //  Z85 test is homemade; using 0, 4 and 8 bytes, with precalculated
    //  test vectors created with a libzmq test.
    //  ----------------------------------------------------------------
    //  Make a fake curve key from hex (base16) string, making sure
    //  there are no null bytes inside, so we can use our test utility
    zarmour_set_mode (self, ZARMOUR_MODE_BASE16);
    zarmour_set_line_breaks (self, false);
    zchunk_t *chunk = zarmour_decode (self,
        "4E6F87E2FB6EB22A1EF5E257B75D79124949565F0B8B36A878A4F03111C96E0B");
    assert (chunk);
    zarmour_set_mode (self, ZARMOUR_MODE_Z85);  //  Z85 mode does not support padding or line breaks
    zarmour_set_pad (self, false);              //  so these two are superfluous;
    zarmour_set_line_breaks (self, false);      //  just for consistency
    if (verbose)
        zarmour_print (self);
    s_armour_test (self, "", "", verbose);
    s_armour_test (self, "foob", "w]zP%", verbose);
    s_armour_test (self, "foobar!!", "w]zP%vr9Im", verbose);
    s_armour_test (self, (char *) zchunk_data (chunk),
                   "ph+{E}!&X?9}!I]W{sm(nL8@&3Yu{wC+<*-5Y[[#", verbose);
    zchunk_destroy (&chunk);
    #endif
    //  Armouring longer byte array to test line breaks
    zarmour_set_pad (self, true);
    zarmour_set_line_breaks (self, true);
    byte test_data [256];
    int index;
    for (index = 0; index < 256; index++)
        test_data [index] = index;
    zarmour_set_mode (self, ZARMOUR_MODE_BASE64_STD);
    s_armour_test_long (self, test_data, 256, verbose);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE64_URL);
    s_armour_test_long (self, test_data, 256, verbose);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE32_STD);
    s_armour_test_long (self, test_data, 256, verbose);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE32_HEX);
    s_armour_test_long (self, test_data, 256, verbose);
    zarmour_set_mode (self, ZARMOUR_MODE_BASE16);
    s_armour_test_long (self, test_data, 256, verbose);
    #ifdef _INCLUDE_Z85
    zarmour_set_mode (self, ZARMOUR_MODE_Z85);
    s_armour_test_long (self, test_data, 256, verbose);
    #endif
    zarmour_destroy (&self);

AUTHORS

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

RESOURCES

Main web site:

Report bugs to the email <zeromq-dev@lists.zeromq.org[1]>

COPYRIGHT

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.

NOTES

1.  zeromq-dev@lists.zeromq.org
    mailto:zeromq-dev@lists.zeromq.org