Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/teletex_string/der_decode_teletex_string.c @ 1928:333688ec53d0

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Handle ecdsa-sk flags, reject no-touch For the time being Dropbear will only allow SK auth with default parameters, user-presence needs to be set. In future handling of authorized_keys option "no-touch-required" can be added. This code would also be refactored to share between ecdsa and ed25519 once I get hardware/emulation to test ed25519.
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Mar 2022 21:06:15 +0800
parents 6dba84798cd5
children
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rev   line source
1471
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file der_decode_teletex_string.c
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13 ASN.1 DER, encode a teletex STRING
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14 */
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15
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16 #ifdef LTC_DER
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17
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18 /**
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19 Store a teletex STRING
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20 @param in The DER encoded teletex STRING
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21 @param inlen The size of the DER teletex STRING
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22 @param out [out] The array of octets stored (one per char)
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23 @param outlen [in/out] The number of octets stored
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24 @return CRYPT_OK if successful
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25 */
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26 int der_decode_teletex_string(const unsigned char *in, unsigned long inlen,
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27 unsigned char *out, unsigned long *outlen)
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28 {
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29 unsigned long x, y, len;
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30 int t;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(out != NULL);
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34 LTC_ARGCHK(outlen != NULL);
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35
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36 /* must have header at least */
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37 if (inlen < 2) {
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38 return CRYPT_INVALID_PACKET;
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39 }
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40
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41 /* check for 0x14 */
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42 if ((in[0] & 0x1F) != 0x14) {
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43 return CRYPT_INVALID_PACKET;
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44 }
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45 x = 1;
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46
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47 /* decode the length */
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48 if (in[x] & 0x80) {
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49 /* valid # of bytes in length are 1,2,3 */
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50 y = in[x] & 0x7F;
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51 if ((y == 0) || (y > 3) || ((x + y) > inlen)) {
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52 return CRYPT_INVALID_PACKET;
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53 }
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54
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55 /* read the length in */
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56 len = 0;
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57 ++x;
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58 while (y--) {
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59 len = (len << 8) | in[x++];
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60 }
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61 } else {
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62 len = in[x++] & 0x7F;
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63 }
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64
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65 /* is it too long? */
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66 if (len > *outlen) {
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67 *outlen = len;
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68 return CRYPT_BUFFER_OVERFLOW;
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69 }
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70
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71 if (len + x > inlen) {
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72 return CRYPT_INVALID_PACKET;
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73 }
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74
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75 /* read the data */
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76 for (y = 0; y < len; y++) {
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77 t = der_teletex_value_decode(in[x++]);
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78 if (t == -1) {
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79 return CRYPT_INVALID_ARG;
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80 }
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81 out[y] = t;
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82 }
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83
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84 *outlen = y;
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85
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86 return CRYPT_OK;
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87 }
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88
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89 #endif
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90
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91 /* ref: $Format:%D$ */
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92 /* git commit: $Format:%H$ */
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93 /* commit time: $Format:%ai$ */