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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <unistd.h>
#include "hexdecoct.h"
#include "macro.h"
#include "sha256.h"
int sha256_fd(int fd, uint64_t max_size, uint8_t ret[static SHA256_DIGEST_SIZE]) {
struct sha256_ctx ctx;
uint64_t total_size = 0;
sha256_init_ctx(&ctx);
for (;;) {
uint8_t buffer[64 * 1024];
ssize_t n;
n = read(fd, buffer, sizeof(buffer));
if (n < 0)
return -errno;
if (n == 0)
break;
if (!INC_SAFE(&total_size, n) || total_size > max_size)
return -EFBIG;
sha256_process_bytes(buffer, n, &ctx);
}
sha256_finish_ctx(&ctx, ret);
return 0;
}
int parse_sha256(const char *s, uint8_t ret[static SHA256_DIGEST_SIZE]) {
_cleanup_free_ uint8_t *data = NULL;
size_t size = 0;
int r;
if (!sha256_is_valid(s))
return -EINVAL;
r = unhexmem_full(s, SHA256_DIGEST_SIZE * 2, false, (void**) &data, &size);
if (r < 0)
return r;
assert(size == SHA256_DIGEST_SIZE);
memcpy(ret, data, size);
return 0;
}
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