Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_file.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 e9dba7abd939
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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 omac_file.c
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13 OMAC1 support, process a file, Tom St Denis
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14 */
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16 #ifdef LTC_OMAC
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18 /**
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19 OMAC a file
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param filename The name of the file you wish to OMAC
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24 @param out [out] Where the authentication tag is to be stored
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25 @param outlen [in/out] The max size and resulting size of the authentication tag
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26 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
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27 */
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28 int omac_file(int cipher,
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29 const unsigned char *key, unsigned long keylen,
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30 const char *filename,
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31 unsigned char *out, unsigned long *outlen)
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32 {
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33 #ifdef LTC_NO_FILE
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34 return CRYPT_NOP;
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35 #else
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36 size_t x;
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37 int err;
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38 omac_state omac;
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39 FILE *in;
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40 unsigned char *buf;
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42 LTC_ARGCHK(key != NULL);
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43 LTC_ARGCHK(filename != NULL);
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44 LTC_ARGCHK(out != NULL);
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45 LTC_ARGCHK(outlen != NULL);
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46
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47 if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
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48 return CRYPT_MEM;
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49 }
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50
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51 if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
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52 goto LBL_ERR;
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53 }
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54
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55 in = fopen(filename, "rb");
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56 if (in == NULL) {
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57 err = CRYPT_FILE_NOTFOUND;
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58 goto LBL_ERR;
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59 }
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60
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61 do {
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62 x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
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63 if ((err = omac_process(&omac, buf, (unsigned long)x)) != CRYPT_OK) {
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64 fclose(in);
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65 goto LBL_CLEANBUF;
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66 }
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67 } while (x == LTC_FILE_READ_BUFSIZE);
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68
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69 if (fclose(in) != 0) {
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70 err = CRYPT_ERROR;
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71 goto LBL_CLEANBUF;
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72 }
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73
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74 err = omac_done(&omac, out, outlen);
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75
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76 LBL_CLEANBUF:
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77 zeromem(buf, LTC_FILE_READ_BUFSIZE);
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78 LBL_ERR:
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79 #ifdef LTC_CLEAN_STACK
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80 zeromem(&omac, sizeof(omac_state));
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81 #endif
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82 XFREE(buf);
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83 return err;
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84 #endif
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85 }
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87 #endif
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88
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89 /* ref: $Format:%D$ */
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90 /* git commit: $Format:%H$ */
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91 /* commit time: $Format:%ai$ */