Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Branch: master
217 lines (195 sloc) 7.474 kB
// --------------------------------------------------------------------------
// Reference implementation for rfc.zeromq.org/spec:32/Z85
//
// This implementation provides a Z85 codec as an easy-to-reuse C class
// designed to be easy to port into other languages.
// --------------------------------------------------------------------------
// Copyright (c) 2010-2013 iMatix Corporation and Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
// --------------------------------------------------------------------------
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
// Basic language taken from CZMQ's prelude
typedef unsigned char byte;
#define streq(s1,s2) (!strcmp ((s1), (s2)))
// Maps base 256 to base 85
static char encoder [85 + 1] = {
"0123456789"
"abcdefghij"
"klmnopqrst"
"uvwxyzABCD"
"EFGHIJKLMN"
"OPQRSTUVWX"
"YZ.-:+=^!/"
"*?&<>()[]{"
"}@%$#"
};
// Maps base 85 to base 256
// We chop off lower 32 and higher 128 ranges
static byte decoder [96] = {
0x00, 0x44, 0x00, 0x54, 0x53, 0x52, 0x48, 0x00,
0x4B, 0x4C, 0x46, 0x41, 0x00, 0x3F, 0x3E, 0x45,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x40, 0x00, 0x49, 0x42, 0x4A, 0x47,
0x51, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A,
0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32,
0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A,
0x3B, 0x3C, 0x3D, 0x4D, 0x00, 0x4E, 0x43, 0x00,
0x00, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20,
0x21, 0x22, 0x23, 0x4F, 0x00, 0x50, 0x00, 0x00
};
// --------------------------------------------------------------------------
// Encode a byte array as a string
char *
Z85_encode (byte *data, size_t size)
{
// Accepts only byte arrays bounded to 4 bytes
if (size % 4)
return NULL;
size_t encoded_size = size * 5 / 4;
char *encoded = malloc (encoded_size + 1);
uint char_nbr = 0;
uint byte_nbr = 0;
uint32_t value = 0;
while (byte_nbr < size) {
// Accumulate value in base 256 (binary)
value = value * 256 + data [byte_nbr++];
if (byte_nbr % 4 == 0) {
// Output value in base 85
uint divisor = 85 * 85 * 85 * 85;
while (divisor) {
encoded [char_nbr++] = encoder [value / divisor % 85];
divisor /= 85;
}
value = 0;
}
}
assert (char_nbr == encoded_size);
encoded [char_nbr] = 0;
return encoded;
}
// --------------------------------------------------------------------------
// Decode an encoded string into a byte array; size of array will be
// strlen (string) * 4 / 5.
byte *
Z85_decode (char *string)
{
// Accepts only strings bounded to 5 bytes
if (strlen (string) % 5)
return NULL;
size_t decoded_size = strlen (string) * 4 / 5;
byte *decoded = malloc (decoded_size);
uint byte_nbr = 0;
uint char_nbr = 0;
uint32_t value = 0;
while (char_nbr < strlen (string)) {
// Accumulate value in base 85
value = value * 85 + decoder [(byte) string [char_nbr++] - 32];
if (char_nbr % 5 == 0) {
// Output value in base 256
uint divisor = 256 * 256 * 256;
while (divisor) {
decoded [byte_nbr++] = value / divisor % 256;
divisor /= 256;
}
value = 0;
}
}
assert (byte_nbr == decoded_size);
return decoded;
}
int main (void)
{
byte test_data_1 [8] = {
0x86, 0x4F, 0xD2, 0x6F, 0xB5, 0x59, 0xF7, 0x5B
};
byte test_data_2 [32] = {
0x8E, 0x0B, 0xDD, 0x69, 0x76, 0x28, 0xB9, 0x1D,
0x8F, 0x24, 0x55, 0x87, 0xEE, 0x95, 0xC5, 0xB0,
0x4D, 0x48, 0x96, 0x3F, 0x79, 0x25, 0x98, 0x77,
0xB4, 0x9C, 0xD9, 0x06, 0x3A, 0xEA, 0xD3, 0xB7
};
char *encoded;
byte *decoded;
encoded = Z85_encode (NULL, 0);
decoded = Z85_decode (encoded);
assert (streq (encoded, ""));
free (decoded);
free (encoded);
encoded = Z85_encode (test_data_1, 3);
assert (encoded == NULL);
encoded = Z85_encode (test_data_1, sizeof (test_data_1));
assert (strlen (encoded) == 10);
assert (streq (encoded, "HelloWorld"));
decoded = Z85_decode (encoded);
assert (memcmp (test_data_1, decoded, sizeof (test_data_1)) == 0);
free (decoded);
free (encoded);
encoded = Z85_encode (test_data_2, sizeof (test_data_2));
assert (strlen (encoded) == 40);
assert (streq (encoded, "JTKVSB%%)wK0E.X)V>+}o?pNmC{O&4W4b!Ni{Lh6"));
decoded = Z85_decode (encoded);
assert (memcmp (test_data_2, decoded, sizeof (test_data_2)) == 0);
free (decoded);
free (encoded);
// Standard test keys defined by zmq_curve man page
byte client_public [32] = {
0xBB, 0x88, 0x47, 0x1D, 0x65, 0xE2, 0x65, 0x9B,
0x30, 0xC5, 0x5A, 0x53, 0x21, 0xCE, 0xBB, 0x5A,
0xAB, 0x2B, 0x70, 0xA3, 0x98, 0x64, 0x5C, 0x26,
0xDC, 0xA2, 0xB2, 0xFC, 0xB4, 0x3F, 0xC5, 0x18
};
byte client_secret [32] = {
0x7B, 0xB8, 0x64, 0xB4, 0x89, 0xAF, 0xA3, 0x67,
0x1F, 0xBE, 0x69, 0x10, 0x1F, 0x94, 0xB3, 0x89,
0x72, 0xF2, 0x48, 0x16, 0xDF, 0xB0, 0x1B, 0x51,
0x65, 0x6B, 0x3F, 0xEC, 0x8D, 0xFD, 0x08, 0x88
};
encoded = Z85_encode (client_public, 32);
// puts (encoded);
free (encoded);
encoded = Z85_encode (client_secret, 32);
// puts (encoded);
free (encoded);
byte server_public [32] = {
0x54, 0xFC, 0xBA, 0x24, 0xE9, 0x32, 0x49, 0x96,
0x93, 0x16, 0xFB, 0x61, 0x7C, 0x87, 0x2B, 0xB0,
0xC1, 0xD1, 0xFF, 0x14, 0x80, 0x04, 0x27, 0xC5,
0x94, 0xCB, 0xFA, 0xCF, 0x1B, 0xC2, 0xD6, 0x52
};
byte server_secret [32] = {
0x8E, 0x0B, 0xDD, 0x69, 0x76, 0x28, 0xB9, 0x1D,
0x8F, 0x24, 0x55, 0x87, 0xEE, 0x95, 0xC5, 0xB0,
0x4D, 0x48, 0x96, 0x3F, 0x79, 0x25, 0x98, 0x77,
0xB4, 0x9C, 0xD9, 0x06, 0x3A, 0xEA, 0xD3, 0xB7
};
encoded = Z85_encode (server_public, 32);
// puts (encoded);
free (encoded);
encoded = Z85_encode (server_secret, 32);
// puts (encoded);
free (encoded);
exit (0);
}
Jump to Line
Something went wrong with that request. Please try again.