Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_init.c @ 1763:c05b76c541c9

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Added signature for changeset 5879c5829e85
author Matt Johnston <matt@ucc.asn.au>
date Thu, 29 Oct 2020 21:40:34 +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
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10 /**
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11 @file ocb_init.c
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12 OCB implementation, initialize state, 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 static const struct {
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19 int len;
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20 unsigned char poly_div[MAXBLOCKSIZE],
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21 poly_mul[MAXBLOCKSIZE];
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22 } polys[] = {
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23 {
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24 8,
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25 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D },
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26 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B }
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27 }, {
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28 16,
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29 { 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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30 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x43 },
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31 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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32 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 }
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33 }
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34 };
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36 /**
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37 Initialize an OCB context.
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38 @param ocb [out] The destination of the OCB state
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39 @param cipher The index of the desired cipher
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40 @param key The secret key
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41 @param keylen The length of the secret key (octets)
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42 @param nonce The session nonce (length of the block size of the cipher)
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43 @return CRYPT_OK if successful
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44 */
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45 int ocb_init(ocb_state *ocb, int cipher,
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46 const unsigned char *key, unsigned long keylen, const unsigned char *nonce)
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47 {
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48 int poly, x, y, m, err;
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49
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50 LTC_ARGCHK(ocb != NULL);
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51 LTC_ARGCHK(key != NULL);
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52 LTC_ARGCHK(nonce != NULL);
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53
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54 /* valid cipher? */
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55 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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56 return err;
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57 }
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58
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59 /* determine which polys to use */
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60 ocb->block_len = cipher_descriptor[cipher].block_length;
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61 x = (int)(sizeof(polys)/sizeof(polys[0]));
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62 for (poly = 0; poly < x; poly++) {
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63 if (polys[poly].len == ocb->block_len) {
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64 break;
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65 }
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66 }
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67 if (poly == x) {
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68 return CRYPT_INVALID_ARG; /* block_len not found in polys */
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