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annotate libtomcrypt/src/stream/chacha/chacha_crypt.c @ 1930:299f4f19ba19

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Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
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
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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: $Format:%ai$ */