Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c @ 701:20dafc77322e

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link to Dropbear webpage
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Mar 2013 19:43:47 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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_encode_octet_string.c
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15 ASN.1 DER, encode a OCTET 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 an OCTET STRING
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23 @param in The array of OCTETS to store (one per char)
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24 @param inlen The number of OCTETS to store
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25 @param out [out] The destination for the DER encoded OCTET STRING
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26 @param outlen [in/out] The max size and resulting size of the DER OCTET STRING
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27 @return CRYPT_OK if successful
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28 */
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29 int der_encode_octet_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 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
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39 /* get the size */
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40 if ((err = der_length_octet_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 /* too big? */
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45 if (len > *outlen) {
382
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46 *outlen = len;
285
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47 return CRYPT_BUFFER_OVERFLOW;
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48 }
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49
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50 /* encode the header+len */
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51 x = 0;
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52 out[x++] = 0x04;
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53 if (inlen < 128) {
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54 out[x++] = (unsigned char)inlen;
285
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55 } else if (inlen < 256) {
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56 out[x++] = 0x81;
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57 out[x++] = (unsigned char)inlen;
285
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58 } else if (inlen < 65536UL) {
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59 out[x++] = 0x82;
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60 out[x++] = (unsigned char)((inlen>>8)&255);
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61 out[x++] = (unsigned char)(inlen&255);
285
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62 } else if (inlen < 16777216UL) {
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63 out[x++] = 0x83;
382
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64 out[x++] = (unsigned char)((inlen>>16)&255);
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65 out[x++] = (unsigned char)((inlen>>8)&255);
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66 out[x++] = (unsigned char)(inlen&255);
285
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67 } else {
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68 return CRYPT_INVALID_ARG;
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69 }
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70
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71 /* store octets */
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72 for (y = 0; y < inlen; y++) {
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73 out[x++] = in[y];
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74 }
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75
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76 /* retun length */
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77 *outlen = x;
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78
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79 return CRYPT_OK;
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80 }
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81
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82 #endif
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83
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84 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c,v $ */
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85 /* $Revision: 1.4 $ */
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86 /* $Date: 2006/12/04 21:34:03 $ */