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#include <iostream>
extern "C" {
#include "md5.h"
#include "sha1.h"
#include "sha256.h"
}
#include "hash.hh"
#include "archive.hh"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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, hashSize);
}
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;
}
Hash::operator string() const
{
ostringstream str;
for (unsigned int i = 0; i < hashSize; i++) {
str.fill('0');
str.width(2);
str << hex << (int) hash[i];
}
return str.str();
}
Hash parseHash(const string & s)
{
Hash hash(htMD5);
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);
istringstream str(s2);
int n;
str >> hex >> n;
hash.hash[i] = n;
}
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;
}
struct Ctx
{
md5_ctx md5;
sha_ctx sha1;
SHA256_CTX sha256;
};
static void start(HashType ht, Ctx & ctx)
{
if (ht == htMD5) md5_init_ctx(&ctx.md5);
else if (ht == htSHA1) sha_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_process_bytes(bytes, len, &ctx.md5);
else if (ht == htSHA1) sha_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_finish_ctx(&ctx.md5, hash);
else if (ht == htSHA1) {
sha_final(&ctx.sha1);
sha_digest(&ctx.sha1, hash);
}
else if (ht == htSHA256) SHA256_Final(hash, &ctx.sha256);
}
Hash hashString(const string & s, HashType ht)
{
Ctx ctx;
Hash hash(ht);
start(ht, ctx);
update(ht, ctx, (const unsigned char *) s.c_str(), s.length());
finish(ht, ctx, hash.hash);
return hash;
}
Hash hashFile(const Path & path, HashType ht)
{
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;
}
struct HashSink : DumpSink
{
HashType ht;
Ctx ctx;
virtual void operator ()
(const unsigned char * data, unsigned int len)
{
update(ht, ctx, data, len);
}
};
Hash hashPath(const Path & path, HashType ht)
{
HashSink sink;
sink.ht = ht;
Hash hash(ht);
start(ht, sink.ctx);
dumpPath(path, sink);
finish(ht, sink.ctx, hash.hash);
return hash;
}
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