Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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) {
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46 *outlen = len;
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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;
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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;
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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);
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62 } else if (inlen < 16777216UL) {
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63 out[x++] = 0x83;
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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);
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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 $ */