1 // SPDX-License-Identifier: BSD-2-Clause
2 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 *
4 * LibTomCrypt is a library that provides various cryptographic
5 * algorithms in a highly modular and flexible manner.
6 *
7 * The library is free for all purposes without any express
8 * guarantee it works.
9 */
10 #include "tomcrypt_private.h"
11
12 /**
13 @file der_decode_printable_string.c
14 ASN.1 DER, encode a printable STRING, Tom St Denis
15 */
16
17
18 #ifdef LTC_DER
19
20 /**
21 Store a printable STRING
22 @param in The DER encoded printable STRING
23 @param inlen The size of the DER printable STRING
24 @param out [out] The array of octets stored (one per char)
25 @param outlen [in/out] The number of octets stored
26 @return CRYPT_OK if successful
27 */
der_decode_printable_string(const unsigned char * in,unsigned long inlen,unsigned char * out,unsigned long * outlen)28 int der_decode_printable_string(const unsigned char *in, unsigned long inlen,
29 unsigned char *out, unsigned long *outlen)
30 {
31 unsigned long x, y, len;
32 int t, err;
33
34 LTC_ARGCHK(in != NULL);
35 LTC_ARGCHK(out != NULL);
36 LTC_ARGCHK(outlen != NULL);
37
38 /* must have header at least */
39 if (inlen < 2) {
40 return CRYPT_INVALID_PACKET;
41 }
42
43 /* check for 0x13 */
44 if ((in[0] & 0x1F) != 0x13) {
45 return CRYPT_INVALID_PACKET;
46 }
47 x = 1;
48
49 /* get the length of the data */
50 y = inlen - x;
51 if ((err = der_decode_asn1_length(in + x, &y, &len)) != CRYPT_OK) {
52 return err;
53 }
54 x += y;
55
56 /* is it too long? */
57 if (len > *outlen) {
58 *outlen = len;
59 return CRYPT_BUFFER_OVERFLOW;
60 }
61
62 if (len > (inlen - x)) {
63 return CRYPT_INVALID_PACKET;
64 }
65
66 /* read the data */
67 for (y = 0; y < len; y++) {
68 t = der_printable_value_decode(in[x++]);
69 if (t == -1) {
70 return CRYPT_INVALID_ARG;
71 }
72 out[y] = t;
73 }
74
75 *outlen = y;
76
77 return CRYPT_OK;
78 }
79
80 #endif
81
82 /* ref: $Format:%D$ */
83 /* git commit: $Format:%H$ */
84 /* commit time: $Format:%ai$ */
85