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comparison libtomcrypt/src/pk/asn1/der/teletex_string/der_decode_teletex_string.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
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1470:8bba51a55704 1471:6dba84798cd5
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 */
9 #include "tomcrypt.h"
10
11 /**
12 @file der_decode_teletex_string.c
13 ASN.1 DER, encode a teletex STRING
14 */
15
16 #ifdef LTC_DER
17
18 /**
19 Store a teletex STRING
20 @param in The DER encoded teletex STRING
21 @param inlen The size of the DER teletex STRING
22 @param out [out] The array of octets stored (one per char)
23 @param outlen [in/out] The number of octets stored
24 @return CRYPT_OK if successful
25 */
26 int der_decode_teletex_string(const unsigned char *in, unsigned long inlen,
27 unsigned char *out, unsigned long *outlen)
28 {
29 unsigned long x, y, len;
30 int t;
31
32 LTC_ARGCHK(in != NULL);
33 LTC_ARGCHK(out != NULL);
34 LTC_ARGCHK(outlen != NULL);
35
36 /* must have header at least */
37 if (inlen < 2) {
38 return CRYPT_INVALID_PACKET;
39 }
40
41 /* check for 0x14 */
42 if ((in[0] & 0x1F) != 0x14) {
43 return CRYPT_INVALID_PACKET;
44 }
45 x = 1;
46
47 /* decode the length */
48 if (in[x] & 0x80) {
49 /* valid # of bytes in length are 1,2,3 */
50 y = in[x] & 0x7F;
51 if ((y == 0) || (y > 3) || ((x + y) > inlen)) {
52 return CRYPT_INVALID_PACKET;
53 }
54
55 /* read the length in */
56 len = 0;
57 ++x;
58 while (y--) {
59 len = (len << 8) | in[x++];
60 }
61 } else {
62 len = in[x++] & 0x7F;
63 }
64
65 /* is it too long? */
66 if (len > *outlen) {
67 *outlen = len;
68 return CRYPT_BUFFER_OVERFLOW;
69 }
70
71 if (len + x > inlen) {
72 return CRYPT_INVALID_PACKET;
73 }
74
75 /* read the data */
76 for (y = 0; y < len; y++) {
77 t = der_teletex_value_decode(in[x++]);
78 if (t == -1) {
79 return CRYPT_INVALID_ARG;
80 }
81 out[y] = t;
82 }
83
84 *outlen = y;
85
86 return CRYPT_OK;
87 }
88
89 #endif
90
91 /* ref: $Format:%D$ */
92 /* git commit: $Format:%H$ */
93 /* commit time: $Format:%ai$ */