Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/bit/der_decode_bit_string.c @ 1612:470aa609c7e4

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avoid extended regex features to avoid caring about sed -r vs -E
author Matt Johnston <matt@ucc.asn.au>
date Tue, 24 Jul 2018 20:19:05 +0800
parents 6dba84798cd5
children
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rev   line source
285
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diff changeset
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_bit_string.c
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13 ASN.1 DER, encode a BIT STRING, Tom St Denis
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14 */
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15
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16
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17 #ifdef LTC_DER
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18
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19 /**
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20 Store a BIT STRING
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21 @param in The DER encoded BIT STRING
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22 @param inlen The size of the DER BIT STRING
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23 @param out [out] The array of bits stored (one per char)
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24 @param outlen [in/out] The number of bits stored
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25 @return CRYPT_OK if successful
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26 */
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27 int der_decode_bit_string(const unsigned char *in, unsigned long inlen,
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28 unsigned char *out, unsigned long *outlen)
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29 {
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30 unsigned long dlen, blen, x, y;
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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 /* packet must be at least 4 bytes */
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37 if (inlen < 4) {
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38 return CRYPT_INVALID_ARG;
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39 }
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40
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41 /* check for 0x03 */
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42 if ((in[0]&0x1F) != 0x03) {
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43 return CRYPT_INVALID_PACKET;
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44 }
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45
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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46 /* offset in the data */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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47 x = 1;
285
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48
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49 /* get the length of the data */
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50 if (in[x] & 0x80) {
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51 /* long format get number of length bytes */
382
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52 y = in[x++] & 0x7F;
285
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53
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54 /* invalid if 0 or > 2 */
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55 if (y == 0 || y > 2) {
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56 return CRYPT_INVALID_PACKET;
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57 }
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58
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59 /* read the data len */
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60 dlen = 0;
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61 while (y--) {
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62 dlen = (dlen << 8) | (unsigned long)in[x++];
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63 }
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64 } else {
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65 /* short format */
382
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66 dlen = in[x++] & 0x7F;
285
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67 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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68
285
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69 /* is the data len too long or too short? */
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70 if ((dlen == 0) || (dlen + x > inlen)) {
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71 return CRYPT_INVALID_PACKET;
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72 }
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73
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74 /* get padding count */
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75 blen = ((dlen - 1) << 3) - (in[x++] & 7);
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76
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77 /* too many bits? */
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78 if (blen > *outlen) {
382
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79 *outlen = blen;
285
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80 return CRYPT_BUFFER_OVERFLOW;
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81 }
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82
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83 /* decode/store the bits */
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84 for (y = 0; y < blen; y++) {
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85 out[y] = (in[x] & (1 << (7 - (y & 7)))) ? 1 : 0;
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86 if ((y & 7) == 7) {
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87 ++x;
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88 }
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89 }
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90
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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91 /* we done */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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parents:
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92 *outlen = blen;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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93 return CRYPT_OK;
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94 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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96 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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97
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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98 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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99 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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100 /* commit time: $Format:%ai$ */