Mercurial > dropbear

annotate libtomcrypt/src/encauth/gcm/gcm_gf_mult.c @ 353:59323ef2833b debug-unrandom

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clarify endian difference
author Matt Johnston <matt@ucc.asn.au>
date Wed, 09 Aug 2006 16:24:29 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
285
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diff changeset
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.org
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10 */
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11
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12 /**
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13 @file gcm_gf_mult.c
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14 GCM implementation, initialize state, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef GCM_MODE
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19
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20 /* right shift */
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21 static void gcm_rightshift(unsigned char *a)
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22 {
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23 int x;
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24 for (x = 15; x > 0; x--) {
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25 a[x] = (a[x]>>1) | ((a[x-1]<<7)&0x80);
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26 }
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27 a[0] >>= 1;
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28 }
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29
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30 /* c = b*a */
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31 static const unsigned char mask[] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
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32 static const unsigned char poly[] = { 0x00, 0xE1 };
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33
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34
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35 /**
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36 GCM GF multiplier (internal use only)
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37 @param a First value
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38 @param b Second value
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39 @param c Destination for a * b
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40 */
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41 void gcm_gf_mult(const unsigned char *a, const unsigned char *b, unsigned char *c)
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42 {
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43 unsigned char Z[16], V[16];
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44 unsigned x, y, z;
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45
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46 zeromem(Z, 16);
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47 XMEMCPY(V, a, 16);
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48 for (x = 0; x < 128; x++) {
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49 if (b[x>>3] & mask[x&7]) {
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50 for (y = 0; y < 16; y++) {
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51 Z[y] ^= V[y];
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52 }
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53 }
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54 z = V[15] & 0x01;
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55 gcm_rightshift(V);
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56 V[0] ^= poly[z];
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57 }
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58 XMEMCPY(c, Z, 16);
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59 }
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60
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61 /**
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62 GCM multiply by H
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63 @param gcm The GCM state which holds the H value
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64 @param I The value to multiply H by
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65 */
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66 void gcm_mult_h(gcm_state *gcm, unsigned char *I)
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67 {
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68 unsigned char T[16];
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69 #ifdef GCM_TABLES
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70 int x, y;
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71 XMEMCPY(T, &gcm->PC[0][I[0]][0], 16);
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72 for (x = 1; x < 16; x++) {
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73 #ifdef LTC_FAST
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74 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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75 *((LTC_FAST_TYPE *)(T + y)) ^= *((LTC_FAST_TYPE *)(&gcm->PC[x][I[x]][y]));
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76 }
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77 #else
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78 for (y = 0; y < 16; y++) {
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79 T[y] ^= gcm->PC[x][I[x]][y];
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80 }
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81 #endif
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82 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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83 #else
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84 gcm_gf_mult(gcm->H, I, T);
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85 #endif
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86 XMEMCPY(I, T, 16);
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87 }
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88
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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89
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_gf_mult.c,v $ */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 /* $Revision: 1.16 $ */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 /* $Date: 2005/05/21 14:33:42 $ */