Mercurial > dropbear

annotate libtomcrypt/src/modes/cfb/cfb_encrypt.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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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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11 /**
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12 @file cfb_encrypt.c
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13 CFB implementation, encrypt data, Tom St Denis
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14 */
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15
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16 #ifdef LTC_CFB_MODE
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18 /**
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19 CFB encrypt
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20 @param pt Plaintext
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21 @param ct [out] Ciphertext
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22 @param len Length of plaintext (octets)
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23 @param cfb CFB state
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24 @return CRYPT_OK if successful
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25 */
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26 int cfb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CFB *cfb)
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27 {
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28 int err;
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30 LTC_ARGCHK(pt != NULL);
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31 LTC_ARGCHK(ct != NULL);
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32 LTC_ARGCHK(cfb != NULL);
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34 if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
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35 return err;
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36 }
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38 /* is blocklen/padlen valid? */
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39 if (cfb->blocklen < 0 || cfb->blocklen > (int)sizeof(cfb->IV) ||
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40 cfb->padlen < 0 || cfb->padlen > (int)sizeof(cfb->pad)) {
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41 return CRYPT_INVALID_ARG;
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42 }
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44 while (len-- > 0) {
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45 if (cfb->padlen == cfb->blocklen) {
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46 if ((err = cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->pad, cfb->IV, &cfb->key)) != CRYPT_OK) {
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47 return err;
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48 }
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49 cfb->padlen = 0;
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50 }
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51 cfb->pad[cfb->padlen] = (*ct = *pt ^ cfb->IV[cfb->padlen]);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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52 ++pt;
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53 ++ct;
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54 ++(cfb->padlen);
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55 }
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56 return CRYPT_OK;
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57 }
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59 #endif
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60
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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61 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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62 /* git commit: $Format:%H$ */
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63 /* commit time: $Format:%ai$ */