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/*
* Copyright 2018-2024 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
*
* Copyright 2018- Fabian Groffen - <grobian@gentoo.org>
*
* The contents of this file was taken from:
* https://github.com/grobian/hashgen
* which was discontinued at the time the sources were incorporated into
* portage-utils as qmanifest.
*/
#include "main.h"
#ifdef HAVE_BLAKE2B
# include <blake2.h>
#endif
#include "md5.h"
#include "sha1.h"
#include "sha256.h"
#include "sha512.h"
#include "hash.h"
void
hash_hex(char *out, const unsigned char *buf, const int length)
{
switch (length) {
case 16: /* MD5_DIGEST_SIZE */
snprintf(out, 32 + 1,
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x",
buf[ 0], buf[ 1], buf[ 2], buf[ 3], buf[ 4],
buf[ 5], buf[ 6], buf[ 7], buf[ 8], buf[ 9],
buf[10], buf[11], buf[12], buf[13], buf[14],
buf[15]
);
break;
case 20: /* SHA1_DIGEST_SIZE */
snprintf(out, 40 + 1,
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
buf[ 0], buf[ 1], buf[ 2], buf[ 3], buf[ 4],
buf[ 5], buf[ 6], buf[ 7], buf[ 8], buf[ 9],
buf[10], buf[11], buf[12], buf[13], buf[14],
buf[15], buf[16], buf[17], buf[18], buf[19]
);
break;
case 32: /* SHA256_DIGEST_SIZE */
snprintf(out, 64 + 1,
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x",
buf[ 0], buf[ 1], buf[ 2], buf[ 3], buf[ 4],
buf[ 5], buf[ 6], buf[ 7], buf[ 8], buf[ 9],
buf[10], buf[11], buf[12], buf[13], buf[14],
buf[15], buf[16], buf[17], buf[18], buf[19],
buf[20], buf[21], buf[22], buf[23], buf[24],
buf[25], buf[26], buf[27], buf[28], buf[29],
buf[30], buf[31]
);
break;
case 64: /* SHA512_DIGEST_SIZE, BLAKE2B_OUTBYTES */
snprintf(out, 128 + 1,
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
"%02x%02x%02x%02x",
buf[ 0], buf[ 1], buf[ 2], buf[ 3], buf[ 4],
buf[ 5], buf[ 6], buf[ 7], buf[ 8], buf[ 9],
buf[10], buf[11], buf[12], buf[13], buf[14],
buf[15], buf[16], buf[17], buf[18], buf[19],
buf[20], buf[21], buf[22], buf[23], buf[24],
buf[25], buf[26], buf[27], buf[28], buf[29],
buf[30], buf[31], buf[32], buf[33], buf[34],
buf[35], buf[36], buf[37], buf[38], buf[39],
buf[40], buf[41], buf[42], buf[43], buf[44],
buf[45], buf[46], buf[47], buf[48], buf[49],
buf[50], buf[51], buf[52], buf[53], buf[54],
buf[55], buf[56], buf[57], buf[58], buf[59],
buf[60], buf[61], buf[62], buf[63]
);
break;
/* fallback case, should never be necessary */
default:
{
int i;
for (i = 0; i < length; i++) {
snprintf(&out[i * 2], 3, "%02x", buf[i]);
}
}
break;
}
}
/* len func(dest,destlen,cbctx) */
typedef size_t (*read_cb)(char *,size_t,void *);
static size_t read_stdio(char *dest, size_t destlen, void *ctx)
{
FILE *io = ctx;
return fread(dest, 1, destlen, io);
}
struct bufctx {
const char *buf;
size_t buflen;
};
static size_t read_buffer(char *dest, size_t destlen, void *ctx)
{
struct bufctx *membuf = ctx;
size_t readlen;
readlen = destlen;
if (readlen > membuf->buflen)
readlen = membuf->buflen;
memcpy(dest, membuf->buf, readlen);
/* update buffer to the remainder */
membuf->buf += readlen;
membuf->buflen -= readlen;
return readlen;
}
static int
hash_multiple_internal(
read_cb rcb,
void *ctx,
char *md5,
char *sha1,
char *sha256,
char *sha512,
char *blak2b,
size_t *flen,
int hashes)
{
size_t len;
char data[8192];
struct md5_ctx m5;
struct sha1_ctx s1;
struct sha256_ctx s256;
struct sha512_ctx s512;
#ifdef HAVE_BLAKE2B
blake2b_state bl2b;
#else
(void)blak2b;
#endif
*flen = 0;
md5_init_ctx(&m5);
sha1_init_ctx(&s1);
sha256_init_ctx(&s256);
sha512_init_ctx(&s512);
#ifdef HAVE_BLAKE2B
blake2b_init(&bl2b, BLAKE2B_OUTBYTES);
#endif
while ((len = rcb(data, sizeof(data), ctx)) > 0) {
*flen += len;
#pragma omp parallel sections
{
#pragma omp section
{
if (hashes & HASH_MD5)
md5_process_bytes(data, len, &m5);
}
#pragma omp section
{
if (hashes & HASH_SHA1)
sha1_process_bytes(data, len, &s1);
}
#pragma omp section
{
if (hashes & HASH_SHA256)
sha256_process_bytes(data, len, &s256);
}
#pragma omp section
{
if (hashes & HASH_SHA512)
sha512_process_bytes(data, len, &s512);
}
#ifdef HAVE_BLAKE2B
#pragma omp section
{
if (hashes & HASH_BLAKE2B)
blake2b_update(&bl2b, (unsigned char *)data, len);
}
#endif
}
}
#pragma omp parallel sections
{
#pragma omp section
{
if (hashes & HASH_MD5) {
unsigned char md5buf[MD5_DIGEST_SIZE];
md5_finish_ctx(&m5, md5buf);
hash_hex(md5, md5buf, MD5_DIGEST_SIZE);
}
}
#pragma omp section
{
if (hashes & HASH_SHA1) {
unsigned char sha1buf[SHA1_DIGEST_SIZE];
sha1_finish_ctx(&s1, sha1buf);
hash_hex(sha1, sha1buf, SHA1_DIGEST_SIZE);
}
}
#pragma omp section
{
if (hashes & HASH_SHA256) {
unsigned char sha256buf[SHA256_DIGEST_SIZE];
sha256_finish_ctx(&s256, sha256buf);
hash_hex(sha256, sha256buf, SHA256_DIGEST_SIZE);
}
}
#pragma omp section
{
if (hashes & HASH_SHA512) {
unsigned char sha512buf[SHA512_DIGEST_SIZE];
sha512_finish_ctx(&s512, sha512buf);
hash_hex(sha512, sha512buf, SHA512_DIGEST_SIZE);
}
}
#ifdef HAVE_BLAKE2B
#pragma omp section
{
if (hashes & HASH_BLAKE2B) {
unsigned char blak2bbuf[BLAKE2B_OUTBYTES];
blake2b_final(&bl2b, blak2bbuf, BLAKE2B_OUTBYTES);
hash_hex(blak2b, blak2bbuf, BLAKE2B_OUTBYTES);
}
}
#endif
}
return 0;
}
/**
* Computes the hashes for file fname and writes the hex-representation
* for those hashes into the address space pointed to by the return
* pointers for these hashes. The caller should ensure enough space is
* available. Only those hashes which are in the global hashes variable
* are computed, the address space pointed to for non-used hashes are
* left untouched, e.g. they can be NULL. The number of bytes read from
* the file pointed to by fname is returned in the flen argument.
*/
int
hash_multiple_file_fd(
int fd,
char *md5,
char *sha1,
char *sha256,
char *sha512,
char *blak2b,
size_t *flen,
int hashes)
{
FILE *f;
int ret;
if ((f = fdopen(fd, "r")) == NULL)
return -1;
ret = hash_multiple_internal(read_stdio, f,
md5, sha1, sha256, sha512, blak2b,
flen, hashes);
fclose(f);
return ret;
}
int
hash_multiple_file_at_cb(
int pfd,
const char *fname,
hash_cb_t cb,
char *md5,
char *sha1,
char *sha256,
char *sha512,
char *blak2b,
size_t *flen,
int hashes)
{
int ret;
int fd = openat(pfd, fname, O_RDONLY | O_CLOEXEC);
if (fd == -1)
return -1;
if (cb != NULL) {
fd = cb(fd, fname);
if (fd == -1)
return -1;
}
ret = hash_multiple_file_fd(fd, md5, sha1, sha256, sha512,
blak2b, flen, hashes);
if (ret != 0)
close(fd);
return ret;
}
static char _hash_file_buf[128 + 1];
char *
hash_file_at_cb(int pfd, const char *fname, int hash, hash_cb_t cb)
{
size_t dummy;
switch (hash) {
case HASH_MD5:
case HASH_SHA1:
case HASH_SHA256:
case HASH_SHA512:
case HASH_BLAKE2B:
if (hash_multiple_file_at_cb(pfd, fname, cb,
_hash_file_buf, _hash_file_buf, _hash_file_buf,
_hash_file_buf, _hash_file_buf,
&dummy, hash) != 0)
return NULL;
break;
default:
return NULL;
}
return _hash_file_buf;
}
char *
hash_string(const char *buf, ssize_t buflen, int hash)
{
struct bufctx membuf;
size_t dummy;
if (buflen < 0)
buflen = (ssize_t)strlen(buf);
membuf.buf = buf;
membuf.buflen = (size_t)buflen;
switch (hash) {
case HASH_MD5:
case HASH_SHA1:
case HASH_SHA256:
case HASH_SHA512:
case HASH_BLAKE2B:
if (hash_multiple_internal(read_buffer, &membuf,
_hash_file_buf, _hash_file_buf,
_hash_file_buf, _hash_file_buf,
_hash_file_buf,
&dummy, hash) != 0)
return NULL;
break;
default:
return NULL;
}
return _hash_file_buf;
}
|