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// Copyright (C) 2010 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
// $Id$
#include <cassert>
#include <iterator>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <exceptions/exceptions.h>
#include <ctype.h>
#include <stdint.h>
#include <string.h>
#include <dns/base32.h>
using namespace std;
namespace isc {
namespace dns {
static const char base32hex[] = "0123456789ABCDEFGHIJKLMNOPQRSTUV";
string
encodeBase32(const vector<uint8_t>& binary) {
ostringstream base32;
size_t len = binary.size();
size_t pos = 0;
while (len > 0) {
char buf[9];
memset(buf, '=', 8);
buf[8] = '\0';
uint8_t digit = (binary.at(pos) >> 3) & 0x1f;
buf[0] = base32hex[digit];
if (len == 1) {
digit = (binary.at(pos) << 2) & 0x1c;
buf[1] = base32hex[digit];
base32 << buf;
break;
}
digit = ((binary.at(pos) << 2) & 0x1c) |
((binary.at(pos + 1) >> 6) & 0x03);
buf[1] = base32hex[digit];
digit = (binary.at(pos + 1) >> 1) & 0x1f;
buf[2] = base32hex[digit];
if (len == 2) {
digit = (binary.at(pos + 1) << 4) & 0x10;
buf[3] = base32hex[digit];
base32 << buf;
break;
}
digit = ((binary.at(pos + 1) << 4) & 0x10) |
((binary.at(pos + 2) >> 4) & 0x0f);
buf[3] = base32hex[digit];
if (len == 3) {
digit = (binary.at(pos + 2) << 1) & 0x1e;
buf[4] = base32hex[digit];
base32 << buf;
break;
}
digit = ((binary.at(pos + 2) << 1) & 0x1e) |
((binary.at(pos + 3) >> 7) & 0x01);
buf[4] = base32hex[digit];
digit = (binary.at(pos + 3) >> 2) & 0x1f;
buf[5] = base32hex[digit];
if (len == 4) {
digit = (binary.at(pos + 3) << 3) & 0x18;
buf[6] = base32hex[digit];
base32 << buf;
break;
}
digit = ((binary.at(pos + 3) << 3) & 0x18) |
((binary.at(pos + 4) >> 5) & 0x07);
buf[6] = base32hex[digit];
digit = binary.at(pos + 4) & 0x1f;
buf[7] = base32hex[digit];
len -= 5;
pos += 5;
base32 << buf;
}
return (base32.str());
}
void
decodeBase32(const string& base32, vector<uint8_t>& result) {
ostringstream comp;
// compress input by removing whitespace
const size_t len = base32.length();
for (int i = 0; i < len; ++i) {
const char c = base32[i];
if (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
continue;
}
comp << c;
}
// base32 text should be a multiple of 8 bytes long
if (comp.str().length() % 8 != 0) {
isc_throw(BadBase32String, "Invalid length: " << comp.str().length());
}
istringstream iss(comp.str());
result.clear();
bool seenpad = false;
while (!iss.eof()) {
string group;
iss >> setw(8) >> group;
if (iss.bad() || iss.fail()) {
isc_throw(BadBase32String,
"Could not parse base32 input: " << base32);
}
uint8_t octet = 0;
for (int i = 0; i < 8; ++i) {
char c = toupper(group.at(i));
int value;
if (c != '=' && seenpad) {
isc_throw(BadBase32String, "Invalid base32 input: " << base32);
} else
if (c == '=' && !seenpad) {
value = 0;
seenpad = true;
} else {
const char* pos = strchr(base32hex, c);
if (!pos) {
isc_throw(BadBase32String,
"Invalid base32 input: " << base32);
}
value = pos - base32hex;
assert (value < 32);
}
switch (i) {
case 0: octet |= value << 3;
break;
case 1: octet |= value >> 2;
result.push_back(octet);
octet = (value & 0x03) << 6;
break;
case 2: octet |= value << 1;
break;
case 3: octet |= value >> 4;
result.push_back(octet);
octet = (value & 0x0f) << 4;
break;
case 4: octet |= value >> 1;
result.push_back(octet);
octet = (value & 0x01) << 7;
break;
case 5: octet |= value << 2;
break;
case 6: octet |= value >> 3;
result.push_back(octet);
octet = (value & 0x07) << 5;
break;
case 7: octet |= value;
result.push_back(octet);
}
}
}
}
}
}
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