Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_encrypt_authenticate_memory.c @ 1484:f68ee671bf6d

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 10 Feb 2018 18:57:20 +0800
parents 6dba84798cd5
children
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285
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diff changeset
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 eax_encrypt_authenticate_memory.c
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12 EAX implementation, encrypt a block of memory, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_EAX_MODE
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17
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18 /**
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19 EAX encrypt and produce an authentication tag
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20 @param cipher The index of the cipher desired
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21 @param key The secret key to use
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22 @param keylen The length of the secret key (octets)
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23 @param nonce The session nonce [use once]
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24 @param noncelen The length of the nonce
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25 @param header The header for the session
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26 @param headerlen The length of the header (octets)
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27 @param pt The plaintext
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28 @param ptlen The length of the plaintext (octets)
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29 @param ct [out] The ciphertext
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30 @param tag [out] The destination tag
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31 @param taglen [in/out] The max size and resulting size of the authentication tag
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32 @return CRYPT_OK if successful
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33 */
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34 int eax_encrypt_authenticate_memory(int cipher,
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35 const unsigned char *key, unsigned long keylen,
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36 const unsigned char *nonce, unsigned long noncelen,
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37 const unsigned char *header, unsigned long headerlen,
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38 const unsigned char *pt, unsigned long ptlen,
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39 unsigned char *ct,
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40 unsigned char *tag, unsigned long *taglen)
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41 {
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42 int err;
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43 eax_state *eax;
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44
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45 LTC_ARGCHK(key != NULL);
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46 LTC_ARGCHK(pt != NULL);
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47 LTC_ARGCHK(ct != NULL);
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48 LTC_ARGCHK(tag != NULL);
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49 LTC_ARGCHK(taglen != NULL);
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50
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51 eax = XMALLOC(sizeof(*eax));
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52
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53 if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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54 goto LBL_ERR;
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55 }
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56
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57 if ((err = eax_encrypt(eax, pt, ct, ptlen)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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58 goto LBL_ERR;
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59 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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60
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61 if ((err = eax_done(eax, tag, taglen)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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62 goto LBL_ERR;
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63 }
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64
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65 err = CRYPT_OK;
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66 LBL_ERR:
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67 #ifdef LTC_CLEAN_STACK
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68 zeromem(eax, sizeof(*eax));
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69 #endif
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70
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71 XFREE(eax);
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72
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 return err;
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74 }
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75
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76 #endif
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77
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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78 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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79 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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80 /* commit time: $Format:%ai$ */