mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 16:37:19 +09:00
0bac442251
Adds a util function to sha256 an open fd (moved from dissect). Also adds functions to check if a string contains a valid sha256 hash, and parse it into a sha256 array.
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <unistd.h>
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#include "hexdecoct.h"
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#include "macro.h"
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#include "sha256.h"
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int sha256_fd(int fd, uint64_t max_size, uint8_t ret[static SHA256_DIGEST_SIZE]) {
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struct sha256_ctx ctx;
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uint64_t total_size = 0;
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sha256_init_ctx(&ctx);
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for (;;) {
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uint8_t buffer[64 * 1024];
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ssize_t n;
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n = read(fd, buffer, sizeof(buffer));
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if (n < 0)
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return -errno;
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if (n == 0)
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break;
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if (!INC_SAFE(&total_size, n) || total_size > max_size)
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return -EFBIG;
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sha256_process_bytes(buffer, n, &ctx);
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}
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sha256_finish_ctx(&ctx, ret);
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return 0;
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}
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int parse_sha256(const char *s, uint8_t ret[static SHA256_DIGEST_SIZE]) {
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_cleanup_free_ uint8_t *data = NULL;
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size_t size = 0;
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int r;
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if (!sha256_is_valid(s))
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return -EINVAL;
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r = unhexmem_full(s, SHA256_DIGEST_SIZE * 2, false, (void**) &data, &size);
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if (r < 0)
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return r;
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assert(size == SHA256_DIGEST_SIZE);
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memcpy(ret, data, size);
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return 0;
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}
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