Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_start.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
parents 6dba84798cd5
children
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file lrw_start.c
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13 LRW_MODE implementation, start mode, Tom St Denis
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14 */
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15
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16 #ifdef LTC_LRW_MODE
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17
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18 /**
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19 Initialize the LRW context
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20 @param cipher The cipher desired, must be a 128-bit block cipher
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21 @param IV The index value, must be 128-bits
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22 @param key The cipher key
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23 @param keylen The length of the cipher key in octets
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24 @param tweak The tweak value (second key), must be 128-bits
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25 @param num_rounds The number of rounds for the cipher (0 == default)
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26 @param lrw [out] The LRW state
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27 @return CRYPT_OK on success.
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28 */
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29 int lrw_start( int cipher,
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30 const unsigned char *IV,
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31 const unsigned char *key, int keylen,
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32 const unsigned char *tweak,
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33 int num_rounds,
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34 symmetric_LRW *lrw)
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35 {
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36 int err;
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37 #ifdef LTC_LRW_TABLES
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38 unsigned char B[16];
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39 int x, y, z, t;
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40 #endif
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41
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42 LTC_ARGCHK(IV != NULL);
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(tweak != NULL);
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45 LTC_ARGCHK(lrw != NULL);
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46
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47 #ifdef LTC_FAST
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48 if (16 % sizeof(LTC_FAST_TYPE)) {
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49 return CRYPT_INVALID_ARG;
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50 }
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51 #endif
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52
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53 /* is cipher valid? */
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54 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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55 return err;
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56 }
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57 if (cipher_descriptor[cipher].block_length != 16) {
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58 return CRYPT_INVALID_CIPHER;
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59 }
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60
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61 /* schedule key */
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62 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &lrw->key)) != CRYPT_OK) {
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63 return err;
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64 }
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65 lrw->cipher = cipher;
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66
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67 /* copy the IV and tweak */
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68 XMEMCPY(lrw->tweak, tweak, 16);
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69
1471
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70 #ifdef LTC_LRW_TABLES
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71 /* setup tables */
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72 /* generate the first table as it has no shifting (from which we make the other tables) */
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73 zeromem(B, 16);
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74 for (y = 0; y < 256; y++) {
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75 B[0] = y;
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76 gcm_gf_mult(tweak, B, &lrw->PC[0][y][0]);
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77 }
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78
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79 /* now generate the rest of the tables based the previous table */
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80 for (x = 1; x < 16; x++) {
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81 for (y = 0; y < 256; y++) {
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82 /* now shift it right by 8 bits */
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83 t = lrw->PC[x-1][y][15];
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84 for (z = 15; z > 0; z--) {
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85 lrw->PC[x][y][z] = lrw->PC[x-1][y][z-1];
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86 }
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87 lrw->PC[x][y][0] = gcm_shift_table[t<<1];
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88 lrw->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1];
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89 }
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90 }
382
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91 #endif
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92
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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93 /* generate first pad */
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94 return lrw_setiv(IV, 16, lrw);
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95 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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96
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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97
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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98 #endif
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99 /* ref: $Format:%D$ */
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100 /* git commit: $Format:%H$ */
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101 /* commit time: $Format:%ai$ */