Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_init.c @ 1672:3a97f14c0235

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Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add [email protected] and [email protected] algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:50:25 +0500
parents 6dba84798cd5
children
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rev   line source
382
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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 xcbc_init.c
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13 XCBC Support, start an XCBC state
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14 */
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15
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16 #ifdef LTC_XCBC
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17
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18 /** Initialize XCBC-MAC state
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19 @param xcbc [out] XCBC state to initialize
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20 @param cipher Index of cipher to use
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21 @param key [in] Secret key
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22 @param keylen Length of secret key in octets
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23 Return CRYPT_OK on success
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24 */
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25 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen)
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26 {
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27 int x, y, err;
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28 symmetric_key *skey;
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29 unsigned long k1;
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30
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31 LTC_ARGCHK(xcbc != NULL);
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32 LTC_ARGCHK(key != NULL);
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33
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34 /* schedule the key */
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35 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 #ifdef LTC_FAST
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40 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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41 return CRYPT_INVALID_ARG;
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42 }
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43 #endif
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44
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45 skey = NULL;
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46
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47 /* are we in pure XCBC mode with three keys? */
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48 if (keylen & LTC_XCBC_PURE) {
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49 keylen &= ~LTC_XCBC_PURE;
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50
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51 if (keylen < 2UL*cipher_descriptor[cipher].block_length) {
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52 return CRYPT_INVALID_ARG;
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53 }
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54
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55 k1 = keylen - 2*cipher_descriptor[cipher].block_length;
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56 XMEMCPY(xcbc->K[0], key, k1);
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57 XMEMCPY(xcbc->K[1], key+k1, cipher_descriptor[cipher].block_length);
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58 XMEMCPY(xcbc->K[2], key+k1 + cipher_descriptor[cipher].block_length, cipher_descriptor[cipher].block_length);
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59 } else {
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60 /* use the key expansion */
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61 k1 = cipher_descriptor[cipher].block_length;
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62
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63 /* schedule the user key */
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64 skey = XCALLOC(1, sizeof(*skey));
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65 if (skey == NULL) {
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66 return CRYPT_MEM;
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67 }
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68
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69 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) {
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70 goto done;
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71 }
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72
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73 /* make the three keys */
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74 for (y = 0; y < 3; y++) {
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75 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) {
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76 xcbc->K[y][x] = y + 1;
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77 }
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78 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey);
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79 }
382
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80 }
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81
382
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82 /* setup K1 */
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83 err = cipher_descriptor[cipher].setup(xcbc->K[0], k1, 0, &xcbc->key);
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84
382
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85 /* setup struct */
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86 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length);
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87 xcbc->blocksize = cipher_descriptor[cipher].block_length;
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88 xcbc->cipher = cipher;
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89 xcbc->buflen = 0;
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90 done:
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91 cipher_descriptor[cipher].done(skey);
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92 if (skey != NULL) {
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93 #ifdef LTC_CLEAN_STACK
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94 zeromem(skey, sizeof(*skey));
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95 #endif
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96 XFREE(skey);
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97 }
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98 return err;
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99 }
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100
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101 #endif
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102
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103 /* ref: $Format:%D$ */
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104 /* git commit: $Format:%H$ */
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105 /* commit time: $Format:%ai$ */
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106