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/* Copyright 2019
* Kaz Kylheku <kaz@kylheku.com>
* Vancouver, Canada
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stddef.h>
#include <wchar.h>
#include <limits.h>
#include <float.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <signal.h>
#include <stdio.h>
#include "config.h"
#include "lib.h"
#include "gc.h"
#include "itypes.h"
#include "signal.h"
#include "unwind.h"
#include "eval.h"
#include "stream.h"
#include "arith.h"
#include "utf8.h"
#include "buf.h"
#include "chksums/sha256.h"
#include "chksum.h"
val sha256_stream(val stream, val nbytes)
{
SHA256_t s256;
unsigned char *hash = chk_malloc(SHA256_DIGEST_LENGTH);
val bfsz = num_fast(BUFSIZ);
val buf = make_buf(bfsz, nil, nil);
SHA256_init(&s256);
if (null_or_missing_p(nbytes)) {
for (;;) {
val read = fill_buf(buf, zero, stream);
cnum rd = c_num(read);
if (!rd)
break;
SHA256_update(&s256, buf->b.data, rd);
}
} else {
while (ge(nbytes, bfsz)) {
val read = fill_buf(buf, zero, stream);
cnum rd = c_num(read);
if (zerop(read))
break;
SHA256_update(&s256, buf->b.data, rd);
nbytes = minus(nbytes, read);
}
buf_set_length(buf, nbytes, nil);
{
val read = fill_buf(buf, zero, stream);
cnum rd = c_num(read);
if (rd)
SHA256_update(&s256, buf->b.data, rd);
}
}
SHA256_final(&s256, hash);
return make_borrowed_buf(num_fast(SHA256_DIGEST_LENGTH), hash);
}
static val sha256_buf(val buf, val self)
{
SHA256_t s256;
unsigned char *hash = chk_malloc(SHA256_DIGEST_LENGTH);
SHA256_init(&s256);
ucnum len = c_unum(buf->b.len);
mem_t *data = buf->b.data;
const size_t szmax = convert(size_t, -1) / 4 + 1;
while (len >= szmax) {
SHA256_update(&s256, data, szmax);
data += szmax;
len -= szmax;
}
if (len > 0)
SHA256_update(&s256, data, len);
SHA256_final(&s256, hash);
return make_borrowed_buf(num_fast(SHA256_DIGEST_LENGTH), hash);
}
static val sha256_str(val str, val self)
{
val s = make_byte_input_stream(str);
return sha256_stream(s, nil);
}
val sha256(val obj)
{
val self = lit("sha256");
switch (type(obj)) {
case STR:
case LSTR:
case LIT:
return sha256_str(obj, self);
case BUF:
return sha256_buf(obj, self);
default:
uw_throwf(error_s, lit("~a: cannot hash ~s, only buffer and strings"),
self, obj, nao);
}
}
void chksum_init(void)
{
reg_fun(intern(lit("sha256-stream"), user_package), func_n2o(sha256_stream, 1));
reg_fun(intern(lit("sha256"), user_package), func_n1(sha256));
}
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