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annotate libtomcrypt/src/stream/chacha/chacha_crypt.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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
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10 /* The implementation is based on:
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11 * chacha-ref.c version 20080118
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12 * Public domain from D. J. Bernstein
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13 */
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14
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15 #include "tomcrypt.h"
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16
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17 #ifdef LTC_CHACHA
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18
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19 #define QUARTERROUND(a,b,c,d) \
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20 x[a] += x[b]; x[d] = ROL(x[d] ^ x[a], 16); \
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21 x[c] += x[d]; x[b] = ROL(x[b] ^ x[c], 12); \
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22 x[a] += x[b]; x[d] = ROL(x[d] ^ x[a], 8); \
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23 x[c] += x[d]; x[b] = ROL(x[b] ^ x[c], 7);
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24
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25 static void _chacha_block(unsigned char *output, const ulong32 *input, int rounds)
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26 {
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27 ulong32 x[16];
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28 int i;
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29 XMEMCPY(x, input, sizeof(x));
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30 for (i = rounds; i > 0; i -= 2) {
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31 QUARTERROUND(0, 4, 8,12)
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32 QUARTERROUND(1, 5, 9,13)
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33 QUARTERROUND(2, 6,10,14)
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34 QUARTERROUND(3, 7,11,15)
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35 QUARTERROUND(0, 5,10,15)
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36 QUARTERROUND(1, 6,11,12)
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37 QUARTERROUND(2, 7, 8,13)
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38 QUARTERROUND(3, 4, 9,14)
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39 }
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40 for (i = 0; i < 16; ++i) {
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41 x[i] += input[i];
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42 STORE32L(x[i], output + 4 * i);
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43 }
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44 }
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45
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46 /**
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47 Encrypt (or decrypt) bytes of ciphertext (or plaintext) with ChaCha
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48 @param st The ChaCha state
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49 @param in The plaintext (or ciphertext)
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50 @param inlen The length of the input (octets)
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51 @param out [out] The ciphertext (or plaintext), length inlen
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52 @return CRYPT_OK if successful
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53 */
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54 int chacha_crypt(chacha_state *st, const unsigned char *in, unsigned long inlen, unsigned char *out)
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55 {
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56 unsigned char buf[64];
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57 unsigned long i, j;
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58
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59 if (inlen == 0) return CRYPT_OK; /* nothing to do */
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60
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61 LTC_ARGCHK(st != NULL);
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62 LTC_ARGCHK(in != NULL);
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63 LTC_ARGCHK(out != NULL);
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64 LTC_ARGCHK(st->ivlen != 0);
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65
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66 if (st->ksleft > 0) {
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67 j = MIN(st->ksleft, inlen);
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68 for (i = 0; i < j; ++i, st->ksleft--) out[i] = in[i] ^ st->kstream[64 - st->ksleft];
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69 inlen -= j;
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70 if (inlen == 0) return CRYPT_OK;
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71 out += j;
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72 in += j;
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73 }
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74 for (;;) {
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75 _chacha_block(buf, st->input, st->rounds);
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76 if (st->ivlen == 8) {
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77 /* IV-64bit, increment 64bit counter */
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78 if (0 == ++st->input[12] && 0 == ++st->input[13]) return CRYPT_OVERFLOW;
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79 }
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80 else {
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81 /* IV-96bit, increment 32bit counter */
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82 if (0 == ++st->input[12]) return CRYPT_OVERFLOW;
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83 }
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84 if (inlen <= 64) {
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85 for (i = 0; i < inlen; ++i) out[i] = in[i] ^ buf[i];
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86 st->ksleft = 64 - inlen;
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87 for (i = inlen; i < 64; ++i) st->kstream[i] = buf[i];
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88 return CRYPT_OK;
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89 }
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90 for (i = 0; i < 64; ++i) out[i] = in[i] ^ buf[i];
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91 inlen -= 64;
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92 out += 64;
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93 in += 64;
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94 }
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95 }
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96
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97 #endif
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98
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99 /* ref: $Format:%D$ */
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100 /* git commit: $Format:%H$ */
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101 /* commit time: $Format:%ai$ */