Mercurial > dropbear

annotate src/encauth/eax/eax_encrypt_authenticate_memory.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11
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12 /**
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13 @file eax_encrypt_authenticate_memory.c
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14 EAX implementation, encrypt a block of memory, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef EAX_MODE
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19
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20 /**
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21 EAX encrypt and produce an authentication tag
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22 @param cipher The index of the cipher desired
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23 @param key The secret key to use
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24 @param keylen The length of the secret key (octets)
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25 @param nonce The session nonce [use once]
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26 @param noncelen The length of the nonce
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27 @param header The header for the session
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28 @param headerlen The length of the header (octets)
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29 @param pt The plaintext
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30 @param ptlen The length of the plaintext (octets)
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31 @param ct [out] The ciphertext
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32 @param tag [out] The destination tag
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33 @param taglen [in/out] The max size and resulting size of the authentication tag
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34 @return CRYPT_OK if successful
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35 */
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36 int eax_encrypt_authenticate_memory(int cipher,
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37 const unsigned char *key, unsigned long keylen,
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38 const unsigned char *nonce, unsigned long noncelen,
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39 const unsigned char *header, unsigned long headerlen,
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40 const unsigned char *pt, unsigned long ptlen,
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41 unsigned char *ct,
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42 unsigned char *tag, unsigned long *taglen)
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43 {
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44 int err;
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45 eax_state *eax;
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46
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47 LTC_ARGCHK(key != NULL);
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48 LTC_ARGCHK(pt != NULL);
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49 LTC_ARGCHK(ct != NULL);
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50 LTC_ARGCHK(tag != NULL);
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51 LTC_ARGCHK(taglen != NULL);
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52
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53 eax = XMALLOC(sizeof(*eax));
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54
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55 if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {
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56 goto LBL_ERR;
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57 }
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58
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59 if ((err = eax_encrypt(eax, pt, ct, ptlen)) != CRYPT_OK) {
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60 goto LBL_ERR;
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61 }
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62
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63 if ((err = eax_done(eax, tag, taglen)) != CRYPT_OK) {
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64 goto LBL_ERR;
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65 }
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66
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67 err = CRYPT_OK;
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68 LBL_ERR:
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69 #ifdef LTC_CLEAN_STACK
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70 zeromem(eax, sizeof(*eax));
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71 #endif
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72
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73 XFREE(eax);
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74
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75 return err;
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76 }
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77
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78 #endif