blob.c revision 1.1 
1/*
2 * Copyright (c) 2018 Yubico AB. All rights reserved.
3 * Use of this source code is governed by a BSD-style
4 * license that can be found in the LICENSE file.
5 */
6
7#include <string.h>
8#include "fido.h"
9
10fido_blob_t *
11fido_blob_new(void)
12{
13	return (calloc(1, sizeof(fido_blob_t)));
14}
15
16int
17fido_blob_set(fido_blob_t *b, const unsigned char *ptr, size_t len)
18{
19	if (b->ptr != NULL) {
20		explicit_bzero(b->ptr, b->len);
21		free(b->ptr);
22		b->ptr = NULL;
23	}
24
25	b->len = 0;
26
27	if (ptr == NULL || len == 0) {
28		log_debug("%s: ptr=%p, len=%zu", __func__, (const void *)ptr,
29		    len);
30		return (-1);
31	}
32
33	if ((b->ptr = malloc(len)) == NULL) {
34		log_debug("%s: malloc", __func__);
35		return (-1);
36	}
37
38	memcpy(b->ptr, ptr, len);
39	b->len = len;
40
41	return (0);
42}
43
44void
45fido_blob_free(fido_blob_t **bp)
46{
47	fido_blob_t *b;
48
49	if (bp == NULL || (b = *bp) == NULL)
50		return;
51
52	if (b->ptr) {
53		explicit_bzero(b->ptr, b->len);
54		free(b->ptr);
55	}
56
57	explicit_bzero(b, sizeof(*b));
58	free(b);
59
60	*bp = NULL;
61}
62
63void
64free_blob_array(fido_blob_array_t *array)
65{
66	if (array->ptr == NULL)
67		return;
68
69	for (size_t i = 0; i < array->len; i++) {
70		fido_blob_t *b = &array->ptr[i];
71		if (b->ptr != NULL) {
72			explicit_bzero(b->ptr, b->len);
73			free(b->ptr);
74			b->ptr = NULL;
75		}
76	}
77
78	free(array->ptr);
79	array->ptr = NULL;
80	array->len = 0;
81}
82
83cbor_item_t *
84fido_blob_encode(const fido_blob_t *b)
85{
86	if (b == NULL || b->ptr == NULL)
87		return (NULL);
88
89	return (cbor_build_bytestring(b->ptr, b->len));
90}
91
92int
93fido_blob_decode(const cbor_item_t *item, fido_blob_t *b)
94{
95	return (cbor_bytestring_copy(item, &b->ptr, &b->len));
96}
97
98int
99fido_blob_is_empty(const fido_blob_t *b)
100{
101	return (b->ptr == NULL || b->len == 0);
102}
103