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annotate src/pk/asn1/der/der_put_multi_integer.c @ 199:8be64e2c86f4 libtomcrypt

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* SMALL_CODE is now LTC_SMALL_CODE
author Matt Johnston <matt@ucc.asn.au>
date Tue, 10 May 2005 17:02:59 +0000
parents 1c15b283127b
children
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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 <stdarg.h>
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12 #include "tomcrypt.h"
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13
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14 /**
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15 @file der_put_multi_integer.c
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16 ASN.1 DER, store multiple integers, Tom St Denis
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17 */
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18
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19
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20 #ifdef LTC_DER
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21
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22 /* store multiple mp_ints in DER INTEGER format to the out, will not
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23 * overflow the length you give it [outlen] and store the number of
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24 * bytes used in [outlen]
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25 */
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26 /**
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27 Store multiple mp_int integers one after another
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28 @param out [out] The destination for the DER encoded integers
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29 @param outlen [in/out] The max size and resulting size of the DER encoded integers
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30 @param num The first mp_int to encode
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31 @param ... A NULL terminated list of mp_ints to encode
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32 @return CRYPT_OK if successful
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33 */
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34 int der_put_multi_integer(unsigned char *out, unsigned long *outlen,
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35 mp_int *num, ...)
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36 {
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37 va_list args;
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38 mp_int *next;
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39 unsigned long wrote, len;
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40 int err;
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41
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42 LTC_ARGCHK(out != NULL);
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43 LTC_ARGCHK(outlen != NULL);
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44
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45 /* setup va list */
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46 next = num;
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47 len = *outlen;
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48 wrote = 0;
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49 va_start(args, num);
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50
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51 while (next != NULL) {
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52 if ((err = der_encode_integer(next, out, outlen)) != CRYPT_OK) {
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53 va_end(args);
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54 return err;
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55 }
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56 wrote += *outlen;
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57 out += *outlen;
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58 len -= *outlen;
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59 *outlen = len;
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60 next = va_arg(args, mp_int*);
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61 }
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62 va_end(args);
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63 *outlen = wrote;
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64 return CRYPT_OK;
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65 }
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66
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67 #endif