Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/printable_string/der_encode_printable_string.c @ 400:a5bca950120d channel-fix

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merge of '1dfbc5ef92391d01b576c8506061927869a89887' and '275426b7a4b94a0507c78327f86bcd2cd0b0f985'
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 08:20:45 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
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rev   line source
285
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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.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_printable_string.c
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15 ASN.1 DER, encode a printable STRING, Tom St Denis
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16 */
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17
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18 #ifdef LTC_DER
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19
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20 /**
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21 Store an printable STRING
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22 @param in The array of printable to store (one per char)
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23 @param inlen The number of printable to store
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24 @param out [out] The destination for the DER encoded printable STRING
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25 @param outlen [in/out] The max size and resulting size of the DER printable STRING
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26 @return CRYPT_OK if successful
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27 */
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28 int der_encode_printable_string(const unsigned char *in, unsigned long inlen,
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29 unsigned char *out, unsigned long *outlen)
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30 {
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31 unsigned long x, y, len;
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32 int err;
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33
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34 LTC_ARGCHK(in != NULL);
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35 LTC_ARGCHK(out != NULL);
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36 LTC_ARGCHK(outlen != NULL);
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37
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38 /* get the size */
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39 if ((err = der_length_printable_string(in, inlen, &len)) != CRYPT_OK) {
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40 return err;
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41 }
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42
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43 /* too big? */
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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 /* encode the header+len */
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49 x = 0;
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50 out[x++] = 0x13;
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51 if (inlen < 128) {
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52 out[x++] = inlen;
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53 } else if (inlen < 256) {
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54 out[x++] = 0x81;
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55 out[x++] = inlen;
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56 } else if (inlen < 65536UL) {
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57 out[x++] = 0x82;
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58 out[x++] = (inlen>>8)&255;
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59 out[x++] = inlen&255;
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60 } else if (inlen < 16777216UL) {
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61 out[x++] = 0x83;
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62 out[x++] = (inlen>>16)&255;
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63 out[x++] = (inlen>>8)&255;
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64 out[x++] = inlen&255;
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65 } else {
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66 return CRYPT_INVALID_ARG;
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67 }
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68
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69 /* store octets */
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70 for (y = 0; y < inlen; y++) {
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71 out[x++] = der_printable_char_encode(in[y]);
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72 }
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73
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74 /* retun length */
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75 *outlen = x;
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76
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77 return CRYPT_OK;
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78 }
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79
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80 #endif
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81
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82 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/printable_string/der_encode_printable_string.c,v $ */
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83 /* $Revision: 1.1 $ */
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84 /* $Date: 2005/05/21 02:29:54 $ */