forked from lix-project/lix
349 lines
7.7 KiB
C++
349 lines
7.7 KiB
C++
#include "config.h"
|
||
|
||
#include <iostream>
|
||
#include <cstring>
|
||
|
||
#include <openssl/md5.h>
|
||
#include <openssl/sha.h>
|
||
|
||
#include "hash.hh"
|
||
#include "archive.hh"
|
||
#include "util.hh"
|
||
|
||
#include <sys/types.h>
|
||
#include <sys/stat.h>
|
||
#include <fcntl.h>
|
||
|
||
|
||
namespace nix {
|
||
|
||
|
||
Hash::Hash()
|
||
{
|
||
type = htUnknown;
|
||
hashSize = 0;
|
||
memset(hash, 0, maxHashSize);
|
||
}
|
||
|
||
|
||
Hash::Hash(HashType type)
|
||
{
|
||
this->type = type;
|
||
if (type == htMD5) hashSize = md5HashSize;
|
||
else if (type == htSHA1) hashSize = sha1HashSize;
|
||
else if (type == htSHA256) hashSize = sha256HashSize;
|
||
else if (type == htSHA512) hashSize = sha512HashSize;
|
||
else abort();
|
||
assert(hashSize <= maxHashSize);
|
||
memset(hash, 0, maxHashSize);
|
||
}
|
||
|
||
|
||
bool Hash::operator == (const Hash & h2) const
|
||
{
|
||
if (hashSize != h2.hashSize) return false;
|
||
for (unsigned int i = 0; i < hashSize; i++)
|
||
if (hash[i] != h2.hash[i]) return false;
|
||
return true;
|
||
}
|
||
|
||
|
||
bool Hash::operator != (const Hash & h2) const
|
||
{
|
||
return !(*this == h2);
|
||
}
|
||
|
||
|
||
bool Hash::operator < (const Hash & h) const
|
||
{
|
||
for (unsigned int i = 0; i < hashSize; i++) {
|
||
if (hash[i] < h.hash[i]) return true;
|
||
if (hash[i] > h.hash[i]) return false;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
|
||
std::string Hash::to_string(bool base32) const
|
||
{
|
||
return printHashType(type) + ":" + (base32 ? printHash32(*this) : printHash(*this));
|
||
}
|
||
|
||
|
||
const string base16Chars = "0123456789abcdef";
|
||
|
||
|
||
string printHash(const Hash & hash)
|
||
{
|
||
char buf[hash.hashSize * 2];
|
||
for (unsigned int i = 0; i < hash.hashSize; i++) {
|
||
buf[i * 2] = base16Chars[hash.hash[i] >> 4];
|
||
buf[i * 2 + 1] = base16Chars[hash.hash[i] & 0x0f];
|
||
}
|
||
return string(buf, hash.hashSize * 2);
|
||
}
|
||
|
||
|
||
Hash parseHash(const string & s)
|
||
{
|
||
string::size_type colon = s.find(':');
|
||
if (colon == string::npos)
|
||
throw BadHash(format("invalid hash ‘%s’") % s);
|
||
string hts = string(s, 0, colon);
|
||
HashType ht = parseHashType(hts);
|
||
if (ht == htUnknown)
|
||
throw BadHash(format("unknown hash type ‘%s’") % hts);
|
||
return parseHash16or32(ht, string(s, colon + 1));
|
||
}
|
||
|
||
|
||
Hash parseHash(HashType ht, const string & s)
|
||
{
|
||
Hash hash(ht);
|
||
if (s.length() != hash.hashSize * 2)
|
||
throw BadHash(format("invalid hash ‘%1%’") % s);
|
||
for (unsigned int i = 0; i < hash.hashSize; i++) {
|
||
string s2(s, i * 2, 2);
|
||
if (!isxdigit(s2[0]) || !isxdigit(s2[1]))
|
||
throw BadHash(format("invalid hash ‘%1%’") % s);
|
||
std::istringstream str(s2);
|
||
int n;
|
||
str >> std::hex >> n;
|
||
hash.hash[i] = n;
|
||
}
|
||
return hash;
|
||
}
|
||
|
||
|
||
// omitted: E O U T
|
||
const string base32Chars = "0123456789abcdfghijklmnpqrsvwxyz";
|
||
|
||
|
||
string printHash32(const Hash & hash)
|
||
{
|
||
size_t len = hash.base32Len();
|
||
assert(len);
|
||
|
||
string s;
|
||
s.reserve(len);
|
||
|
||
for (int n = len - 1; n >= 0; n--) {
|
||
unsigned int b = n * 5;
|
||
unsigned int i = b / 8;
|
||
unsigned int j = b % 8;
|
||
unsigned char c =
|
||
(hash.hash[i] >> j)
|
||
| (i >= hash.hashSize - 1 ? 0 : hash.hash[i + 1] << (8 - j));
|
||
s.push_back(base32Chars[c & 0x1f]);
|
||
}
|
||
|
||
return s;
|
||
}
|
||
|
||
|
||
string printHash16or32(const Hash & hash)
|
||
{
|
||
return hash.type == htMD5 ? printHash(hash) : printHash32(hash);
|
||
}
|
||
|
||
|
||
Hash parseHash32(HashType ht, const string & s)
|
||
{
|
||
Hash hash(ht);
|
||
size_t len = hash.base32Len();
|
||
assert(s.size() == len);
|
||
|
||
for (unsigned int n = 0; n < len; ++n) {
|
||
char c = s[len - n - 1];
|
||
unsigned char digit;
|
||
for (digit = 0; digit < base32Chars.size(); ++digit) /* !!! slow */
|
||
if (base32Chars[digit] == c) break;
|
||
if (digit >= 32)
|
||
throw BadHash(format("invalid base-32 hash ‘%1%’") % s);
|
||
unsigned int b = n * 5;
|
||
unsigned int i = b / 8;
|
||
unsigned int j = b % 8;
|
||
hash.hash[i] |= digit << j;
|
||
if (i < hash.hashSize - 1) hash.hash[i + 1] |= digit >> (8 - j);
|
||
}
|
||
|
||
return hash;
|
||
}
|
||
|
||
|
||
Hash parseHash16or32(HashType ht, const string & s)
|
||
{
|
||
Hash hash(ht);
|
||
if (s.size() == hash.hashSize * 2)
|
||
/* hexadecimal representation */
|
||
hash = parseHash(ht, s);
|
||
else if (s.size() == hash.base32Len())
|
||
/* base-32 representation */
|
||
hash = parseHash32(ht, s);
|
||
else
|
||
throw BadHash(format("hash ‘%1%’ has wrong length for hash type ‘%2%’")
|
||
% s % printHashType(ht));
|
||
return hash;
|
||
}
|
||
|
||
|
||
bool isHash(const string & s)
|
||
{
|
||
if (s.length() != 32) return false;
|
||
for (int i = 0; i < 32; i++) {
|
||
char c = s[i];
|
||
if (!((c >= '0' && c <= '9') ||
|
||
(c >= 'a' && c <= 'f')))
|
||
return false;
|
||
}
|
||
return true;
|
||
}
|
||
|
||
|
||
union Ctx
|
||
{
|
||
MD5_CTX md5;
|
||
SHA_CTX sha1;
|
||
SHA256_CTX sha256;
|
||
SHA512_CTX sha512;
|
||
};
|
||
|
||
|
||
static void start(HashType ht, Ctx & ctx)
|
||
{
|
||
if (ht == htMD5) MD5_Init(&ctx.md5);
|
||
else if (ht == htSHA1) SHA1_Init(&ctx.sha1);
|
||
else if (ht == htSHA256) SHA256_Init(&ctx.sha256);
|
||
else if (ht == htSHA512) SHA512_Init(&ctx.sha512);
|
||
}
|
||
|
||
|
||
static void update(HashType ht, Ctx & ctx,
|
||
const unsigned char * bytes, unsigned int len)
|
||
{
|
||
if (ht == htMD5) MD5_Update(&ctx.md5, bytes, len);
|
||
else if (ht == htSHA1) SHA1_Update(&ctx.sha1, bytes, len);
|
||
else if (ht == htSHA256) SHA256_Update(&ctx.sha256, bytes, len);
|
||
else if (ht == htSHA512) SHA512_Update(&ctx.sha512, bytes, len);
|
||
}
|
||
|
||
|
||
static void finish(HashType ht, Ctx & ctx, unsigned char * hash)
|
||
{
|
||
if (ht == htMD5) MD5_Final(hash, &ctx.md5);
|
||
else if (ht == htSHA1) SHA1_Final(hash, &ctx.sha1);
|
||
else if (ht == htSHA256) SHA256_Final(hash, &ctx.sha256);
|
||
else if (ht == htSHA512) SHA512_Final(hash, &ctx.sha512);
|
||
}
|
||
|
||
|
||
Hash hashString(HashType ht, const string & s)
|
||
{
|
||
Ctx ctx;
|
||
Hash hash(ht);
|
||
start(ht, ctx);
|
||
update(ht, ctx, (const unsigned char *) s.data(), s.length());
|
||
finish(ht, ctx, hash.hash);
|
||
return hash;
|
||
}
|
||
|
||
|
||
Hash hashFile(HashType ht, const Path & path)
|
||
{
|
||
Ctx ctx;
|
||
Hash hash(ht);
|
||
start(ht, ctx);
|
||
|
||
AutoCloseFD fd = open(path.c_str(), O_RDONLY | O_CLOEXEC);
|
||
if (!fd) throw SysError(format("opening file ‘%1%’") % path);
|
||
|
||
unsigned char buf[8192];
|
||
ssize_t n;
|
||
while ((n = read(fd.get(), buf, sizeof(buf)))) {
|
||
checkInterrupt();
|
||
if (n == -1) throw SysError(format("reading file ‘%1%’") % path);
|
||
update(ht, ctx, buf, n);
|
||
}
|
||
|
||
finish(ht, ctx, hash.hash);
|
||
return hash;
|
||
}
|
||
|
||
|
||
HashSink::HashSink(HashType ht) : ht(ht)
|
||
{
|
||
ctx = new Ctx;
|
||
bytes = 0;
|
||
start(ht, *ctx);
|
||
}
|
||
|
||
HashSink::~HashSink()
|
||
{
|
||
bufPos = 0;
|
||
delete ctx;
|
||
}
|
||
|
||
void HashSink::write(const unsigned char * data, size_t len)
|
||
{
|
||
bytes += len;
|
||
update(ht, *ctx, data, len);
|
||
}
|
||
|
||
HashResult HashSink::finish()
|
||
{
|
||
flush();
|
||
Hash hash(ht);
|
||
nix::finish(ht, *ctx, hash.hash);
|
||
return HashResult(hash, bytes);
|
||
}
|
||
|
||
HashResult HashSink::currentHash()
|
||
{
|
||
flush();
|
||
Ctx ctx2 = *ctx;
|
||
Hash hash(ht);
|
||
nix::finish(ht, ctx2, hash.hash);
|
||
return HashResult(hash, bytes);
|
||
}
|
||
|
||
|
||
HashResult hashPath(
|
||
HashType ht, const Path & path, PathFilter & filter)
|
||
{
|
||
HashSink sink(ht);
|
||
dumpPath(path, sink, filter);
|
||
return sink.finish();
|
||
}
|
||
|
||
|
||
Hash compressHash(const Hash & hash, unsigned int newSize)
|
||
{
|
||
Hash h;
|
||
h.hashSize = newSize;
|
||
for (unsigned int i = 0; i < hash.hashSize; ++i)
|
||
h.hash[i % newSize] ^= hash.hash[i];
|
||
return h;
|
||
}
|
||
|
||
|
||
HashType parseHashType(const string & s)
|
||
{
|
||
if (s == "md5") return htMD5;
|
||
else if (s == "sha1") return htSHA1;
|
||
else if (s == "sha256") return htSHA256;
|
||
else if (s == "sha512") return htSHA512;
|
||
else return htUnknown;
|
||
}
|
||
|
||
|
||
string printHashType(HashType ht)
|
||
{
|
||
if (ht == htMD5) return "md5";
|
||
else if (ht == htSHA1) return "sha1";
|
||
else if (ht == htSHA256) return "sha256";
|
||
else if (ht == htSHA512) return "sha512";
|
||
else abort();
|
||
}
|
||
|
||
|
||
}
|