forked from lix-project/lix
349 lines
8 KiB
C++
349 lines
8 KiB
C++
#include <iostream>
|
|
#include <cstring>
|
|
|
|
#include <openssl/md5.h>
|
|
#include <openssl/sha.h>
|
|
|
|
#include "hash.hh"
|
|
#include "archive.hh"
|
|
#include "util.hh"
|
|
#include "istringstream_nocopy.hh"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
|
|
namespace nix {
|
|
|
|
|
|
void Hash::init()
|
|
{
|
|
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
|
|
{
|
|
if (hashSize < h.hashSize) return true;
|
|
if (hashSize > h.hashSize) return false;
|
|
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;
|
|
}
|
|
|
|
|
|
const string base16Chars = "0123456789abcdef";
|
|
|
|
|
|
static string printHash16(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);
|
|
}
|
|
|
|
|
|
// omitted: E O U T
|
|
const string base32Chars = "0123456789abcdfghijklmnpqrsvwxyz";
|
|
|
|
|
|
static string printHash32(const Hash & hash)
|
|
{
|
|
assert(hash.hashSize);
|
|
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.to_string(hash.type == htMD5 ? Base16 : Base32, false);
|
|
}
|
|
|
|
|
|
std::string Hash::to_string(Base base, bool includeType) const
|
|
{
|
|
std::string s;
|
|
if (includeType) {
|
|
s += printHashType(type);
|
|
s += ':';
|
|
}
|
|
switch (base) {
|
|
case Base16:
|
|
s += printHash16(*this);
|
|
break;
|
|
case Base32:
|
|
s += printHash32(*this);
|
|
break;
|
|
case Base64:
|
|
s += base64Encode(std::string((const char *) hash, hashSize));
|
|
break;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
|
|
Hash::Hash(const std::string & s, HashType type)
|
|
: type(type)
|
|
{
|
|
auto colon = s.find(':');
|
|
|
|
size_t pos = 0;
|
|
|
|
if (colon == string::npos) {
|
|
if (type == htUnknown)
|
|
throw BadHash("hash '%s' does not include a type", s);
|
|
} else {
|
|
string hts = string(s, 0, colon);
|
|
this->type = parseHashType(hts);
|
|
if (this->type == htUnknown)
|
|
throw BadHash("unknown hash type '%s'", hts);
|
|
if (type != htUnknown && type != this->type)
|
|
throw BadHash("hash '%s' should have type '%s'", s, printHashType(type));
|
|
pos = colon + 1;
|
|
}
|
|
|
|
init();
|
|
|
|
size_t size = s.size() - pos;
|
|
|
|
if (size == base16Len()) {
|
|
|
|
auto parseHexDigit = [&](char c) {
|
|
if (c >= '0' && c <= '9') return c - '0';
|
|
if (c >= 'A' && c <= 'F') return c - 'A' + 10;
|
|
if (c >= 'a' && c <= 'f') return c - 'a' + 10;
|
|
throw BadHash("invalid base-16 hash '%s'", s);
|
|
};
|
|
|
|
for (unsigned int i = 0; i < hashSize; i++) {
|
|
hash[i] =
|
|
parseHexDigit(s[pos + i * 2]) << 4
|
|
| parseHexDigit(s[pos + i * 2 + 1]);
|
|
}
|
|
}
|
|
|
|
else if (size == base32Len()) {
|
|
|
|
for (unsigned int n = 0; n < size; ++n) {
|
|
char c = s[pos + size - n - 1];
|
|
unsigned char digit;
|
|
for (digit = 0; digit < base32Chars.size(); ++digit) /* !!! slow */
|
|
if (base32Chars[digit] == c) break;
|
|
if (digit >= 32)
|
|
throw BadHash("invalid base-32 hash '%s'", s);
|
|
unsigned int b = n * 5;
|
|
unsigned int i = b / 8;
|
|
unsigned int j = b % 8;
|
|
hash[i] |= digit << j;
|
|
|
|
if (i < hashSize - 1) {
|
|
hash[i + 1] |= digit >> (8 - j);
|
|
} else {
|
|
if (digit >> (8 - j))
|
|
throw BadHash("invalid base-32 hash '%s'", s);
|
|
}
|
|
}
|
|
}
|
|
|
|
else if (size == base64Len()) {
|
|
auto d = base64Decode(std::string(s, pos));
|
|
if (d.size() != hashSize)
|
|
throw BadHash("invalid base-64 hash '%s'", s);
|
|
assert(hashSize);
|
|
memcpy(hash, d.data(), hashSize);
|
|
}
|
|
|
|
else
|
|
throw BadHash("hash '%s' has wrong length for hash type '%s'", s, printHashType(type));
|
|
}
|
|
|
|
|
|
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, size_t 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();
|
|
}
|
|
|
|
|
|
}
|