Mercurial > dropbear

annotate src/pk/asn1/der/ia5/der_decode_ia5_string.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16

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Update to LibTomCrypt 1.16
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:22:00 +0000
parents 59400faa4b44
children
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59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file der_decode_ia5_string.c
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15 ASN.1 DER, encode a IA5 STRING, Tom St Denis
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16 */
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17
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18
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19 #ifdef LTC_DER
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20
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21 /**
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22 Store a IA5 STRING
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23 @param in The DER encoded IA5 STRING
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24 @param inlen The size of the DER IA5 STRING
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25 @param out [out] The array of octets stored (one per char)
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26 @param outlen [in/out] The number of octets stored
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27 @return CRYPT_OK if successful
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28 */
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29 int der_decode_ia5_string(const unsigned char *in, unsigned long inlen,
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30 unsigned char *out, unsigned long *outlen)
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31 {
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32 unsigned long x, y, len;
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33 int t;
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34
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35 LTC_ARGCHK(in != NULL);
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36 LTC_ARGCHK(out != NULL);
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37 LTC_ARGCHK(outlen != NULL);
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38
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39 /* must have header at least */
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40 if (inlen < 2) {
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41 return CRYPT_INVALID_PACKET;
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42 }
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43
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44 /* check for 0x16 */
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45 if ((in[0] & 0x1F) != 0x16) {
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46 return CRYPT_INVALID_PACKET;
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47 }
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48 x = 1;
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49
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50 /* decode the length */
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51 if (in[x] & 0x80) {
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52 /* valid # of bytes in length are 1,2,3 */
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53 y = in[x] & 0x7F;
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54 if ((y == 0) || (y > 3) || ((x + y) > inlen)) {
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55 return CRYPT_INVALID_PACKET;
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56 }
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57
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58 /* read the length in */
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59 len = 0;
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60 ++x;
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61 while (y--) {
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62 len = (len << 8) | in[x++];
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63 }
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64 } else {
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65 len = in[x++] & 0x7F;
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66 }
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67
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68 /* is it too long? */
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69 if (len > *outlen) {
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70 *outlen = len;
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71 return CRYPT_BUFFER_OVERFLOW;
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72 }
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73
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74 if (len + x > inlen) {
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75 return CRYPT_INVALID_PACKET;
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76 }
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77
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78 /* read the data */
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79 for (y = 0; y < len; y++) {
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80 t = der_ia5_value_decode(in[x++]);
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81 if (t == -1) {
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82 return CRYPT_INVALID_ARG;
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83 }
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84 out[y] = t;
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85 }
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86
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87 *outlen = y;
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88
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89 return CRYPT_OK;
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90 }
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91
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92 #endif
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93
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94 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_decode_ia5_string.c,v $ */
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95 /* $Revision: 1.3 $ */
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96 /* $Date: 2006/06/16 21:53:41 $ */