188 lines
3.9 KiB
C++
188 lines
3.9 KiB
C++
#include <iostream>
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extern "C" {
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#include "md5.h"
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#include "sha1.h"
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#include "sha256.h"
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}
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#include "hash.hh"
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#include "archive.hh"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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Hash::Hash(HashType type)
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{
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this->type = type;
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if (type == htMD5) hashSize = md5HashSize;
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else if (type == htSHA1) hashSize = sha1HashSize;
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else if (type == htSHA256) hashSize = sha256HashSize;
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else throw Error("unknown hash type");
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memset(hash, 0, hashSize);
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}
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bool Hash::operator == (const Hash & h2) const
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{
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if (hashSize != h2.hashSize) return false;
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for (unsigned int i = 0; i < hashSize; i++)
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if (hash[i] != h2.hash[i]) return false;
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return true;
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}
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bool Hash::operator != (const Hash & h2) const
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{
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return !(*this == h2);
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}
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bool Hash::operator < (const Hash & h) const
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{
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for (unsigned int i = 0; i < hashSize; i++) {
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if (hash[i] < h.hash[i]) return true;
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if (hash[i] > h.hash[i]) return false;
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}
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return false;
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}
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Hash::operator string() const
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{
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ostringstream str;
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for (unsigned int i = 0; i < hashSize; i++) {
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str.fill('0');
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str.width(2);
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str << hex << (int) hash[i];
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}
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return str.str();
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}
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Hash parseHash(const string & s)
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{
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Hash hash(htMD5);
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if (s.length() != hash.hashSize * 2)
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throw Error(format("invalid hash `%1%'") % s);
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for (unsigned int i = 0; i < hash.hashSize; i++) {
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string s2(s, i * 2, 2);
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if (!isxdigit(s2[0]) || !isxdigit(s2[1]))
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throw Error(format("invalid hash `%1%'") % s);
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istringstream str(s2);
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int n;
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str >> hex >> n;
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hash.hash[i] = n;
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}
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return hash;
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}
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bool isHash(const string & s)
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{
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if (s.length() != 32) return false;
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for (int i = 0; i < 32; i++) {
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char c = s[i];
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if (!((c >= '0' && c <= '9') ||
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(c >= 'a' && c <= 'f')))
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return false;
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}
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return true;
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}
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struct Ctx
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{
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md5_ctx md5;
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sha_ctx sha1;
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SHA256_CTX sha256;
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};
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static void start(HashType ht, Ctx & ctx)
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{
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if (ht == htMD5) md5_init_ctx(&ctx.md5);
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else if (ht == htSHA1) sha_init(&ctx.sha1);
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else if (ht == htSHA256) SHA256_Init(&ctx.sha256);
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}
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static void update(HashType ht, Ctx & ctx,
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const unsigned char * bytes, unsigned int len)
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{
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if (ht == htMD5) md5_process_bytes(bytes, len, &ctx.md5);
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else if (ht == htSHA1) sha_update(&ctx.sha1, bytes, len);
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else if (ht == htSHA256) SHA256_Update(&ctx.sha256, bytes, len);
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}
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static void finish(HashType ht, Ctx & ctx, unsigned char * hash)
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{
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if (ht == htMD5) md5_finish_ctx(&ctx.md5, hash);
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else if (ht == htSHA1) {
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sha_final(&ctx.sha1);
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sha_digest(&ctx.sha1, hash);
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}
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else if (ht == htSHA256) SHA256_Final(hash, &ctx.sha256);
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}
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Hash hashString(const string & s, HashType ht)
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{
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Ctx ctx;
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Hash hash(ht);
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start(ht, ctx);
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update(ht, ctx, (const unsigned char *) s.c_str(), s.length());
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finish(ht, ctx, hash.hash);
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return hash;
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}
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Hash hashFile(const Path & path, HashType ht)
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{
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Ctx ctx;
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Hash hash(ht);
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start(ht, ctx);
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AutoCloseFD fd = open(path.c_str(), O_RDONLY);
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if (fd == -1) throw SysError(format("opening file `%1%'") % path);
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unsigned char buf[8192];
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ssize_t n;
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while ((n = read(fd, buf, sizeof(buf)))) {
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checkInterrupt();
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if (n == -1) throw SysError(format("reading file `%1%'") % path);
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update(ht, ctx, buf, n);
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}
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finish(ht, ctx, hash.hash);
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return hash;
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}
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struct HashSink : DumpSink
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{
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HashType ht;
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Ctx ctx;
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virtual void operator ()
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(const unsigned char * data, unsigned int len)
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{
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update(ht, ctx, data, len);
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}
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};
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Hash hashPath(const Path & path, HashType ht)
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{
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HashSink sink;
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sink.ht = ht;
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Hash hash(ht);
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start(ht, sink.ctx);
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dumpPath(path, sink);
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finish(ht, sink.ctx, hash.hash);
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return hash;
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}
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