Mercurial > dropbear

annotate libtomcrypt/src/modes/xts/xts_encrypt.c @ 1704:d384bc2e5af3

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Don't warn when SO_PRIORITY fails
author Matt Johnston <matt@ucc.asn.au>
date Thu, 28 May 2020 23:26:34 +0800
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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10
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11 /**
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12 Source donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) to the LibTom Projects
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13 */
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14
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15 #ifdef LTC_XTS_MODE
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16
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17 static int _tweak_crypt(const unsigned char *P, unsigned char *C, unsigned char *T, symmetric_xts *xts)
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18 {
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19 unsigned long x;
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20 int err;
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21
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22 /* tweak encrypt block i */
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23 #ifdef LTC_FAST
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24 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) {
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25 *(LTC_FAST_TYPE_PTR_CAST(&C[x])) = *(LTC_FAST_TYPE_PTR_CAST(&P[x])) ^ *(LTC_FAST_TYPE_PTR_CAST(&T[x]));
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26 }
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27 #else
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28 for (x = 0; x < 16; x++) {
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29 C[x] = P[x] ^ T[x];
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30 }
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31 #endif
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32
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33 if ((err = cipher_descriptor[xts->cipher].ecb_encrypt(C, C, &xts->key1)) != CRYPT_OK) {
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34 return err;
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35 }
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36
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37 #ifdef LTC_FAST
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38 for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) {
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39 *(LTC_FAST_TYPE_PTR_CAST(&C[x])) ^= *(LTC_FAST_TYPE_PTR_CAST(&T[x]));
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40 }
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41 #else
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42 for (x = 0; x < 16; x++) {
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43 C[x] = C[x] ^ T[x];
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44 }
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45 #endif
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46
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47 /* LFSR the tweak */
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48 xts_mult_x(T);
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49
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50 return CRYPT_OK;
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51 }
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52
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53 /** XTS Encryption
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54 @param pt [in] Plaintext
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55 @param ptlen Length of plaintext (and ciphertext)
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56 @param ct [out] Ciphertext
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57 @param tweak [in] The 128--bit encryption tweak (e.g. sector number)
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58 @param xts The XTS structure
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59 Returns CRYPT_OK upon success
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60 */
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61 int xts_encrypt(const unsigned char *pt, unsigned long ptlen, unsigned char *ct, unsigned char *tweak,
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62 symmetric_xts *xts)
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63 {
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64 unsigned char PP[16], CC[16], T[16];
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65 unsigned long i, m, mo, lim;
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66 int err;
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67
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68 /* check inputs */
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69 LTC_ARGCHK(pt != NULL);
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70 LTC_ARGCHK(ct != NULL);
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