Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c @ 1697:789466c5956b

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set up early logging name
author Matt Johnston <matt@ucc.asn.au>
date Thu, 28 May 2020 22:02:33 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file der_encode_octet_string.c
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13 ASN.1 DER, encode a OCTET STRING, Tom St Denis
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14 */
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16
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17 #ifdef LTC_DER
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18
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19 /**
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20 Store an OCTET STRING
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21 @param in The array of OCTETS to store (one per char)
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22 @param inlen The number of OCTETS to store
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23 @param out [out] The destination for the DER encoded OCTET STRING
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24 @param outlen [in/out] The max size and resulting size of the DER OCTET STRING
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25 @return CRYPT_OK if successful
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26 */
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27 int der_encode_octet_string(const unsigned char *in, unsigned long inlen,
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28 unsigned char *out, unsigned long *outlen)
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29 {
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30 unsigned long x, y, len;
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31 int err;
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32
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33 LTC_ARGCHK(in != NULL);
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34 LTC_ARGCHK(out != NULL);
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35 LTC_ARGCHK(outlen != NULL);
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36
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37 /* get the size */
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38 if ((err = der_length_octet_string(inlen, &len)) != CRYPT_OK) {
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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39 return err;
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40 }
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41
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42 /* too big? */
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43 if (len > *outlen) {
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44 *outlen = len;
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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++] = 0x04;
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51 if (inlen < 128) {
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52 out[x++] = (unsigned char)inlen;
285
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53 } else if (inlen < 256) {
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54 out[x++] = 0x81;
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55 out[x++] = (unsigned char)inlen;
285
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56 } else if (inlen < 65536UL) {
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57 out[x++] = 0x82;
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58 out[x++] = (unsigned char)((inlen>>8)&255);
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59 out[x++] = (unsigned char)(inlen&255);
285
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60 } else if (inlen < 16777216UL) {
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61 out[x++] = 0x83;
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62 out[x++] = (unsigned char)((inlen>>16)&255);
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63 out[x++] = (unsigned char)((inlen>>8)&255);
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64 out[x++] = (unsigned char)(inlen&255);
285
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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++] = 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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84 /* commit time: $Format:%ai$ */