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/***
This file is part of PulseAudio.
Copyright 2013 Martin Blanchard
Copyright Kungliga Tekniska Høgskolan & Colin Guthrie
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
/***
The base64 implementation was originally inspired by a file developed
by Kungliga Tekniska högskolan.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <openssl/err.h>
#include <openssl/md5.h>
#include <pulse/xmalloc.h>
#include <pulsecore/core-util.h>
#include <pulsecore/macro.h>
#include "raop-util.h"
#ifndef MD5_DIGEST_LENGTH
#define MD5_DIGEST_LENGTH 16
#endif
#define MD5_HASH_LENGTH (2*MD5_DIGEST_LENGTH)
#define BASE64_DECODE_ERROR 0xffffffff
static const char base64_chars[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static int char_position(char c) {
if (c >= 'A' && c <= 'Z')
return c - 'A' + 0;
if (c >= 'a' && c <= 'z')
return c - 'a' + 26;
if (c >= '0' && c <= '9')
return c - '0' + 52;
if (c == '+')
return 62;
if (c == '/')
return 63;
return -1;
}
static unsigned int token_decode(const char *token) {
unsigned int val = 0;
int marker = 0;
int i;
if (strlen(token) < 4)
return BASE64_DECODE_ERROR;
for (i = 0; i < 4; i++) {
val *= 64;
if (token[i] == '=')
marker++;
else if (marker > 0)
return BASE64_DECODE_ERROR;
else {
int lpos = char_position(token[i]);
if (lpos < 0)
return BASE64_DECODE_ERROR;
val += lpos;
}
}
if (marker > 2)
return BASE64_DECODE_ERROR;
return (marker << 24) | val;
}
int pa_raop_base64_encode(const void *data, int len, char **str) {
const unsigned char *q;
char *p, *s = NULL;
int i, c;
pa_assert(data);
pa_assert(str);
p = s = pa_xnew(char, len * 4 / 3 + 4);
q = (const unsigned char *) data;
for (i = 0; i < len;) {
c = q[i++];
c *= 256;
if (i < len)
c += q[i];
i++;
c *= 256;
if (i < len)
c += q[i];
i++;
p[0] = base64_chars[(c & 0x00fc0000) >> 18];
p[1] = base64_chars[(c & 0x0003f000) >> 12];
p[2] = base64_chars[(c & 0x00000fc0) >> 6];
p[3] = base64_chars[(c & 0x0000003f) >> 0];
if (i > len)
p[3] = '=';
if (i > len + 1)
p[2] = '=';
p += 4;
}
*p = 0;
*str = s;
return strlen(s);
}
int pa_raop_base64_decode(const char *str, void *data) {
const char *p;
unsigned char *q;
pa_assert(str);
pa_assert(data);
q = data;
for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
unsigned int val = token_decode(p);
unsigned int marker = (val >> 24) & 0xff;
if (val == BASE64_DECODE_ERROR)
return -1;
*q++ = (val >> 16) & 0xff;
if (marker < 2)
*q++ = (val >> 8) & 0xff;
if (marker < 1)
*q++ = val & 0xff;
}
return q - (unsigned char *) data;
}
int pa_raop_md5_hash(const char *data, int len, char **str) {
unsigned char d[MD5_DIGEST_LENGTH];
char *s = NULL;
int i;
pa_assert(data);
pa_assert(str);
MD5((unsigned char*) data, len, d);
s = pa_xnew(char, MD5_HASH_LENGTH);
for (i = 0; i < MD5_DIGEST_LENGTH; i++)
sprintf(&s[2*i], "%02x", (unsigned int) d[i]);
*str = s;
s[MD5_HASH_LENGTH] = 0;
return strlen(s);
}
int pa_raop_basic_response(const char *user, const char *pwd, char **str) {
char *tmp, *B = NULL;
pa_assert(str);
tmp = pa_sprintf_malloc("%s:%s", user, pwd);
pa_raop_base64_encode(tmp, strlen(tmp), &B);
pa_xfree(tmp);
*str = B;
return strlen(B);
}
int pa_raop_digest_response(const char *user, const char *realm, const char *password,
const char *nonce, const char *uri, char **str) {
char *A1, *HA1, *A2, *HA2;
char *tmp, *KD = NULL;
pa_assert(str);
A1 = pa_sprintf_malloc("%s:%s:%s", user, realm, password);
pa_raop_md5_hash(A1, strlen(A1), &HA1);
pa_xfree(A1);
A2 = pa_sprintf_malloc("OPTIONS:%s", uri);
pa_raop_md5_hash(A2, strlen(A2), &HA2);
pa_xfree(A2);
tmp = pa_sprintf_malloc("%s:%s:%s", HA1, nonce, HA2);
pa_raop_md5_hash(tmp, strlen(tmp), &KD);
pa_xfree(tmp);
pa_xfree(HA1);
pa_xfree(HA2);
*str = KD;
return strlen(KD);
}
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