194 lines
6.1 KiB
C
194 lines
6.1 KiB
C
/*-
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* Copyright (c) 2013-2014 The University of Oslo
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <sys/types.h>
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#include <errno.h>
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#include <stdint.h>
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#include <security/oath.h>
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#include "oath_impl.h"
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static const char b64enc[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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static const char b64dec[256] = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
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0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
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0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
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0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
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0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
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0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
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0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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};
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/*
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* Encode data in RFC 4648 base 64 representation. The target buffer must
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* have room for base64_enclen(len) characters and a terminating NUL.
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*/
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int
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base64_enc(const char *cin, size_t ilen, char *out, size_t *olen)
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{
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const uint8_t *in = (const uint8_t *)cin;
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uint32_t bits;
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if (*olen <= base64_enclen(ilen)) {
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*olen = base64_enclen(ilen) + 1;
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errno = ENOSPC;
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return (-1);
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}
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*olen = 0;
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while (ilen >= 3) {
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bits = 0;
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bits |= (uint32_t)in[0] << 16;
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bits |= (uint32_t)in[1] << 8;
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bits |= (uint32_t)in[2];
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ilen -= 3;
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in += 3;
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out[0] = b64enc[bits >> 18 & 0x3f];
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out[1] = b64enc[bits >> 12 & 0x3f];
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out[2] = b64enc[bits >> 6 & 0x3f];
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out[3] = b64enc[bits & 0x3f];
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*olen += 4;
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out += 4;
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}
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if (ilen > 0) {
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bits = 0;
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switch (ilen) {
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case 2:
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bits |= (uint32_t)in[1] << 8;
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case 1:
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bits |= (uint32_t)in[0] << 16;
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COVERAGE_NO_DEFAULT_CASE
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}
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out[0] = b64enc[bits >> 18 & 0x3f];
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out[1] = b64enc[bits >> 12 & 0x3f];
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out[2] = ilen > 1 ? b64enc[bits >> 6 & 0x3f] : '=';
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out[3] = '=';
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*olen += 4;
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out += 4;
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}
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out[0] = '\0';
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++*olen;
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return (0);
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}
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/*
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* Decode data in RFC 4648 base 64 representation, stopping at the
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* terminating NUL, the first invalid (non-base64, non-whitespace)
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* character or after len characters, whichever comes first.
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*
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* Padding is handled sloppily: any padding character following the data
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* is silently consumed. This not only simplifies the code but ensures
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* compatibility with implementations which do not emit or understand
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* padding.
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*
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* The olen argument is used by the caller to pass the size of the buffer
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* and by base64_dec() to return the amount of data successfully decoded.
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* If the buffer is too small, base64_dec() discards the excess data, but
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* returns the total amount.
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*/
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int
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base64_dec(const char *cin, size_t ilen, char *out, size_t *olen)
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{
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const uint8_t *in = (const uint8_t *)cin;
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size_t len;
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int bits, shift, padding;
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for (bits = shift = padding = len = 0; ilen && *in; --ilen, ++in) {
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if (*in == ' ' || *in == '\t' || *in == '\r' || *in == '\n' ||
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(padding && *in == '=')) {
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/* consume */
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continue;
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} else if (!padding && b64dec[*in] >= 0) {
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/* shift into accumulator */
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shift += 6;
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bits = bits << 6 | b64dec[*in];
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} else if (!padding && shift > 0 && shift != 6 && *in == '=') {
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/* final byte */
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shift = 0;
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padding = 1;
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} else {
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/* error */
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*olen = 0;
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errno = EINVAL;
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return (-1);
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}
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if (shift >= 8) {
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/* output accumulated byte */
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shift -= 8;
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if (len++ < *olen)
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*out++ = (bits >> shift) & 0xff;
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}
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}
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/* report decoded length */
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if (len > *olen) {
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/* overflow */
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*olen = len;
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errno = ENOSPC;
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return (-1);
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}
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*olen = len;
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return (0);
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}
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