forked from lix-project/lix
b428adc267
~/.nix-defexpr, otherwise the attribute cannot be selected with the `-A' option. Useful if you want to stick a Nix expression directly in ~/.nix-defexpr.
340 lines
7 KiB
C++
340 lines
7 KiB
C++
#include "config.h"
|
|
|
|
#include <iostream>
|
|
#include <cstring>
|
|
|
|
#ifdef HAVE_OPENSSL
|
|
#include <openssl/md5.h>
|
|
#include <openssl/sha.h>
|
|
#else
|
|
extern "C" {
|
|
#include "md5.h"
|
|
#include "sha1.h"
|
|
#include "sha256.h"
|
|
}
|
|
#endif
|
|
|
|
#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 throw Error("unknown hash type");
|
|
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;
|
|
}
|
|
|
|
|
|
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(HashType ht, const string & s)
|
|
{
|
|
Hash hash(ht);
|
|
if (s.length() != hash.hashSize * 2)
|
|
throw Error(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 Error(format("invalid hash `%1%'") % s);
|
|
std::istringstream str(s2);
|
|
int n;
|
|
str >> std::hex >> n;
|
|
hash.hash[i] = n;
|
|
}
|
|
return hash;
|
|
}
|
|
|
|
|
|
static unsigned char divMod(unsigned char * bytes, unsigned char y)
|
|
{
|
|
unsigned int borrow = 0;
|
|
|
|
int pos = Hash::maxHashSize - 1;
|
|
while (pos >= 0 && !bytes[pos]) --pos;
|
|
|
|
for ( ; pos >= 0; --pos) {
|
|
unsigned int s = bytes[pos] + (borrow << 8);
|
|
unsigned int d = s / y;
|
|
borrow = s % y;
|
|
bytes[pos] = d;
|
|
}
|
|
|
|
return borrow;
|
|
}
|
|
|
|
|
|
unsigned int hashLength32(const Hash & hash)
|
|
{
|
|
return (hash.hashSize * 8 - 1) / 5 + 1;
|
|
}
|
|
|
|
|
|
// omitted: E O U T
|
|
const string base32Chars = "0123456789abcdfghijklmnpqrsvwxyz";
|
|
|
|
|
|
string printHash32(const Hash & hash)
|
|
{
|
|
Hash hash2(hash);
|
|
unsigned int len = hashLength32(hash);
|
|
|
|
const char * chars = base32Chars.c_str();
|
|
|
|
string s(len, '0');
|
|
|
|
int pos = len - 1;
|
|
while (pos >= 0) {
|
|
unsigned char digit = divMod(hash2.hash, 32);
|
|
s[pos--] = chars[digit];
|
|
}
|
|
|
|
for (unsigned int i = 0; i < hash2.maxHashSize; ++i)
|
|
assert(hash2.hash[i] == 0);
|
|
|
|
return s;
|
|
}
|
|
|
|
|
|
static bool mul(unsigned char * bytes, unsigned char y, int maxSize)
|
|
{
|
|
unsigned char carry = 0;
|
|
|
|
for (int pos = 0; pos < maxSize; ++pos) {
|
|
unsigned int m = bytes[pos] * y + carry;
|
|
bytes[pos] = m & 0xff;
|
|
carry = m >> 8;
|
|
}
|
|
|
|
return carry;
|
|
}
|
|
|
|
|
|
static bool add(unsigned char * bytes, unsigned char y, int maxSize)
|
|
{
|
|
unsigned char carry = y;
|
|
|
|
for (int pos = 0; pos < maxSize; ++pos) {
|
|
unsigned int m = bytes[pos] + carry;
|
|
bytes[pos] = m & 0xff;
|
|
carry = m >> 8;
|
|
if (carry == 0) break;
|
|
}
|
|
|
|
return carry;
|
|
}
|
|
|
|
|
|
Hash parseHash32(HashType ht, const string & s)
|
|
{
|
|
Hash hash(ht);
|
|
|
|
const char * chars = base32Chars.c_str();
|
|
|
|
for (unsigned int i = 0; i < s.length(); ++i) {
|
|
char c = s[i];
|
|
unsigned char digit;
|
|
for (digit = 0; digit < base32Chars.size(); ++digit) /* !!! slow */
|
|
if (chars[digit] == c) break;
|
|
if (digit >= 32)
|
|
throw Error(format("invalid base-32 hash `%1%'") % s);
|
|
if (mul(hash.hash, 32, hash.hashSize) ||
|
|
add(hash.hash, digit, hash.hashSize))
|
|
throw Error(format("base-32 hash `%1%' is too large") % s);
|
|
}
|
|
|
|
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;
|
|
};
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
|
|
Hash hashString(HashType ht, const string & s)
|
|
{
|
|
Ctx ctx;
|
|
Hash hash(ht);
|
|
start(ht, ctx);
|
|
update(ht, ctx, (const unsigned char *) s.c_str(), s.length());
|
|
finish(ht, ctx, hash.hash);
|
|
//printMsg(lvlError, format("hashString %1% --> %2%:\n%3%\n===========END======") % s.size() % printHash(hash) % s);
|
|
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);
|
|
if (fd == -1) throw SysError(format("opening file `%1%'") % path);
|
|
|
|
unsigned char buf[8192];
|
|
ssize_t n;
|
|
while ((n = read(fd, 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;
|
|
start(ht, *ctx);
|
|
}
|
|
|
|
HashSink::~HashSink()
|
|
{
|
|
delete ctx;
|
|
}
|
|
|
|
void HashSink::operator ()
|
|
(const unsigned char * data, unsigned int len)
|
|
{
|
|
update(ht, *ctx, data, len);
|
|
}
|
|
|
|
Hash HashSink::finish()
|
|
{
|
|
Hash hash(ht);
|
|
nix::finish(ht, *ctx, hash.hash);
|
|
return hash;
|
|
}
|
|
|
|
|
|
Hash 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 return htUnknown;
|
|
}
|
|
|
|
|
|
}
|