Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/bit/der_encode_bit_string.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
parents
children 0cbe8f6dbf9e
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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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_encode_bit_string.c
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15 ASN.1 DER, encode a BIT 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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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21 /**
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22 Store a BIT STRING
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23 @param in The array of bits to store (one per char)
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24 @param inlen The number of bits tostore
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25 @param out [out] The destination for the DER encoded BIT STRING
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26 @param outlen [in/out] The max size and resulting size of the DER BIT STRING
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27 @return CRYPT_OK if successful
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28 */
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29 int der_encode_bit_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 len, x, y, buf;
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33 int err;
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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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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39 /* avoid overflows */
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40 if ((err = der_length_bit_string(inlen, &len)) != CRYPT_OK) {
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41 return err;
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42 }
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43
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44 if (len > *outlen) {
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45 return CRYPT_BUFFER_OVERFLOW;
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46 }
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47
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48 /* store header (include bit padding count in length) */
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49 x = 0;
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50 y = (inlen >> 3) + ((inlen&7) ? 1 : 0) + 1;
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51
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52 out[x++] = 0x03;
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53 if (y < 128) {
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54 out[x++] = y;
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55 } else if (y < 256) {
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56 out[x++] = 0x81;
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57 out[x++] = y;
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58 } else if (y < 65536) {
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59 out[x++] = 0x82;
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60 out[x++] = (y>>8)&255;
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61 out[x++] = y&255;
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62 }
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63
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64 /* store number of zero padding bits */
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65 out[x++] = (8 - inlen) & 7;
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66
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67 /* store the bits in big endian format */
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68 for (y = buf = 0; y < inlen; y++) {
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69 buf |= (in[y] ? 1 : 0) << (7 - (y & 7));
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70 if ((y & 7) == 7) {
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71 out[x++] = buf;
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72 buf = 0;
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73 }
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74 }
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75 /* store last byte */
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76 if (inlen & 7) {
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77 out[x++] = buf;
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78 }
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79 *outlen = x;
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80 return CRYPT_OK;
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81 }
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82
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83 #endif
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84
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85 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/bit/der_encode_bit_string.c,v $ */
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86 /* $Revision: 1.1 $ */
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87 /* $Date: 2005/05/16 15:08:11 $ */