Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/printable_string/der_encode_printable_string.c @ 647:939cd3e22c87 dropbear-tfm

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- Fix constraints so we don't get warned about uninitialised variable (it isn't used as input by the asm)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Nov 2011 23:15:21 +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_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 *outlen = len;
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46 return CRYPT_BUFFER_OVERFLOW;
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47 }
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48
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49 /* encode the header+len */
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50 x = 0;
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51 out[x++] = 0x13;
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52 if (inlen < 128) {
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53 out[x++] = (unsigned char)inlen;
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54 } else if (inlen < 256) {
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55 out[x++] = 0x81;
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56 out[x++] = (unsigned char)inlen;
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57 } else if (inlen < 65536UL) {
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58 out[x++] = 0x82;
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59 out[x++] = (unsigned char)((inlen>>8)&255);
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60 out[x++] = (unsigned char)(inlen&255);
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61 } else if (inlen < 16777216UL) {
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62 out[x++] = 0x83;
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63 out[x++] = (unsigned char)((inlen>>16)&255);
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64 out[x++] = (unsigned char)((inlen>>8)&255);
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65 out[x++] = (unsigned char)(inlen&255);
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66 } else {
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67 return CRYPT_INVALID_ARG;
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68 }
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69
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70 /* store octets */
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71 for (y = 0; y < inlen; y++) {
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72 out[x++] = der_printable_char_encode(in[y]);
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73 }
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74
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75 /* retun length */
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76 *outlen = x;
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77
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78 return CRYPT_OK;
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79 }
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80
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81 #endif
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82
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83 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/printable_string/der_encode_printable_string.c,v $ */
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84 /* $Revision: 1.4 $ */
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85 /* $Date: 2006/12/04 21:34:03 $ */