Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_done_decrypt.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
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10 /**
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11 @file ocb_done_decrypt.c
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12 OCB implementation, terminate decryption, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_OCB_MODE
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18 /**
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19 Terminate a decrypting OCB state
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20 @param ocb The OCB state
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21 @param ct The ciphertext (if any)
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22 @param ctlen The length of the ciphertext (octets)
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23 @param pt [out] The plaintext
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24 @param tag The authentication tag (to compare against)
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25 @param taglen The length of the authentication tag provided
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26 @param stat [out] The result of the tag comparison
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27 @return CRYPT_OK if the process was successful regardless if the tag is valid
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28 */
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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29 int ocb_done_decrypt(ocb_state *ocb,
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30 const unsigned char *ct, unsigned long ctlen,
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31 unsigned char *pt,
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32 const unsigned char *tag, unsigned long taglen, int *stat)
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33 {
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34 int err;
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35 unsigned char *tagbuf;
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36 unsigned long tagbuflen;
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38 LTC_ARGCHK(ocb != NULL);
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39 LTC_ARGCHK(pt != NULL);
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40 LTC_ARGCHK(ct != NULL);
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41 LTC_ARGCHK(tag != NULL);
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42 LTC_ARGCHK(stat != NULL);
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44 /* default to failed */
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45 *stat = 0;
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47 /* allocate memory */
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48 tagbuf = XMALLOC(MAXBLOCKSIZE);
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49 if (tagbuf == NULL) {
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50 return CRYPT_MEM;
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51 }
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52
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53 tagbuflen = MAXBLOCKSIZE;
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54 if ((err = s_ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) {
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55 goto LBL_ERR;
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56 }
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57
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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58 if (taglen <= tagbuflen && XMEM_NEQ(tagbuf, tag, taglen) == 0) {
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59 *stat = 1;
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60 }
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62 err = CRYPT_OK;
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63 LBL_ERR:
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(tagbuf, MAXBLOCKSIZE);
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66 #endif
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68 XFREE(tagbuf);
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69
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70 return err;
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71 }
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73 #endif
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75
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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76 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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77 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 /* commit time: $Format:%ai$ */