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annotate libtomcrypt/src/pk/asn1/der/bit/der_encode_raw_bit_string.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 6dba84798cd5
children
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1471
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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_bit_string.c
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13 ASN.1 DER, encode a BIT STRING, Tom St Denis
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14 */
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15
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16
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17 #ifdef LTC_DER
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18
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19 #define getbit(n, k) (((n) & ( 1 << (k) )) >> (k))
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20
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21 /**
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22 Store a BIT STRING
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23 @param in The array of bits to store (8 per char)
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24 @param inlen The number of bits to store
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25 @param out [out] The destination for the DER encoded BIT STRING
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26 @param outlen [in/out] The max size and resulting size of the DER BIT STRING
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27 @return CRYPT_OK if successful
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28 */
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29 int der_encode_raw_bit_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 len, x, y;
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33 unsigned char buf;
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34 int err;
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35
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36 LTC_ARGCHK(in != NULL);
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37 LTC_ARGCHK(out != NULL);
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38 LTC_ARGCHK(outlen != NULL);
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39
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40 /* avoid overflows */
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41 if ((err = der_length_bit_string(inlen, &len)) != CRYPT_OK) {
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42 return err;
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43 }
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44
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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 /* store header (include bit padding count in length) */
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51 x = 0;
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52 y = (inlen >> 3) + ((inlen&7) ? 1 : 0) + 1;
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53
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54 out[x++] = 0x03;
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55 if (y < 128) {
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56 out[x++] = (unsigned char)y;
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57 } else if (y < 256) {
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58 out[x++] = 0x81;
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59 out[x++] = (unsigned char)y;
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60 } else if (y < 65536) {
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61 out[x++] = 0x82;
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62 out[x++] = (unsigned char)((y>>8)&255);
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63 out[x++] = (unsigned char)(y&255);
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64 }
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65
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66 /* store number of zero padding bits */
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67 out[x++] = (unsigned char)((8 - inlen) & 7);
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68
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69 /* store the bits in big endian format */
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70 for (y = buf = 0; y < inlen; y++) {
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71 buf |= (getbit(in[y/8],7-y%8)?1:0) << (7 - (y & 7));
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72 if ((y & 7) == 7) {
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73 out[x++] = buf;
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74 buf = 0;
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75 }
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76 }
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77 /* store last byte */
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78 if (inlen & 7) {
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79 out[x++] = buf;
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80 }
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81
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82 *outlen = x;
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83 return CRYPT_OK;
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84 }
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85
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86 #endif
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87
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88 /* ref: $Format:%D$ */
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89 /* git commit: $Format:%H$ */
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90 /* commit time: $Format:%ai$ */