1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */
2 /* SPDX-License-Identifier: Unlicense */
3
4 #include "tomcrypt_private.h"
5
pk_oid_str_to_num(const char * OID,unsigned long * oid,unsigned long * oidlen)6 int pk_oid_str_to_num(const char *OID, unsigned long *oid, unsigned long *oidlen)
7 {
8 unsigned long i, j, limit, oid_j;
9 size_t OID_len;
10
11 LTC_ARGCHK(oidlen != NULL);
12
13 limit = *oidlen;
14 *oidlen = 0; /* make sure that we return zero oidlen on error */
15 for (i = 0; i < limit; i++) oid[i] = 0;
16
17 if (OID == NULL) return CRYPT_OK;
18
19 OID_len = XSTRLEN(OID);
20 if (OID_len == 0) return CRYPT_OK;
21
22 for (i = 0, j = 0; i < OID_len; i++) {
23 if (OID[i] == '.') {
24 if (++j >= limit) continue;
25 }
26 else if ((OID[i] >= '0') && (OID[i] <= '9')) {
27 if ((j >= limit) || (oid == NULL)) continue;
28 oid_j = oid[j];
29 oid[j] = oid[j] * 10 + (OID[i] - '0');
30 if (oid[j] < oid_j) return CRYPT_OVERFLOW;
31 }
32 else {
33 return CRYPT_ERROR;
34 }
35 }
36 if (j == 0) return CRYPT_ERROR;
37 if (j >= limit) {
38 *oidlen = j;
39 return CRYPT_BUFFER_OVERFLOW;
40 }
41 *oidlen = j + 1;
42 return CRYPT_OK;
43 }
44
pk_oid_num_to_str(const unsigned long * oid,unsigned long oidlen,char * OID,unsigned long * outlen)45 int pk_oid_num_to_str(const unsigned long *oid, unsigned long oidlen, char *OID, unsigned long *outlen)
46 {
47 int i;
48 unsigned long j, k;
49 char tmp[256] = { 0 };
50
51 LTC_ARGCHK(oid != NULL);
52 LTC_ARGCHK(oidlen < INT_MAX);
53 LTC_ARGCHK(outlen != NULL);
54
55 for (i = oidlen - 1, k = 0; i >= 0; i--) {
56 j = oid[i];
57 if (j == 0) {
58 tmp[k] = '0';
59 if (++k >= sizeof(tmp)) return CRYPT_ERROR;
60 }
61 else {
62 while (j > 0) {
63 tmp[k] = '0' + (j % 10);
64 if (++k >= sizeof(tmp)) return CRYPT_ERROR;
65 j /= 10;
66 }
67 }
68 if (i > 0) {
69 tmp[k] = '.';
70 if (++k >= sizeof(tmp)) return CRYPT_ERROR;
71 }
72 }
73 if (*outlen < k + 1) {
74 *outlen = k + 1;
75 return CRYPT_BUFFER_OVERFLOW;
76 }
77 LTC_ARGCHK(OID != NULL);
78 for (j = 0; j < k; j++) OID[j] = tmp[k - j - 1];
79 OID[k] = '\0';
80 *outlen = k; /* the length without terminating NUL byte */
81 return CRYPT_OK;
82 }
83