Mercurial > dropbear

annotate libtomcrypt/src/math/rand_prime.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
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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 #if defined(LTC_MRSA) || (!defined(LTC_NO_MATH) && !defined(LTC_NO_PRNGS))
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12
382
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13 /**
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14 @file rand_prime.c
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15 Generate a random prime, Tom St Denis
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16 */
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17
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18 #define USE_BBS 1
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19
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20 int rand_prime(void *N, long len, prng_state *prng, int wprng)
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21 {
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22 int err, res, type;
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23 unsigned char *buf;
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24
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25 LTC_ARGCHK(N != NULL);
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26
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27 /* get type */
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28 if (len < 0) {
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29 type = USE_BBS;
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30 len = -len;
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31 } else {
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32 type = 0;
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33 }
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34
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35 /* allow sizes between 2 and 512 bytes for a prime size */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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36 if (len < 2 || len > 512) {
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37 return CRYPT_INVALID_PRIME_SIZE;
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38 }
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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39
382
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40 /* valid PRNG? Better be! */
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41 if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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42 return err;
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43 }
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44
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45 /* allocate buffer to work with */
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46 buf = XCALLOC(1, len);
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47 if (buf == NULL) {
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48 return CRYPT_MEM;
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49 }
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50
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51 do {
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52 /* generate value */
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53 if (prng_descriptor[wprng].read(buf, len, prng) != (unsigned long)len) {
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54 XFREE(buf);
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55 return CRYPT_ERROR_READPRNG;
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56 }
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57
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58 /* munge bits */
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59 buf[0] |= 0x80 | 0x40;
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60 buf[len-1] |= 0x01 | ((type & USE_BBS) ? 0x02 : 0x00);
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61
382
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62 /* load value */
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63 if ((err = mp_read_unsigned_bin(N, buf, len)) != CRYPT_OK) {
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64 XFREE(buf);
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65 return err;
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66 }
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67
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68 /* test */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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69 if ((err = mp_prime_is_prime(N, LTC_MILLER_RABIN_REPS, &res)) != CRYPT_OK) {
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70 XFREE(buf);
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71 return err;
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72 }
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73 } while (res == LTC_MP_NO);
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74
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75 #ifdef LTC_CLEAN_STACK
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76 zeromem(buf, len);
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77 #endif
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78
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79 XFREE(buf);
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80 return CRYPT_OK;
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81 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
83 #endif /* LTC_NO_MATH */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
86 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
87 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
88 /* commit time: $Format:%ai$ */