Mercurial > dropbear
annotate libtomcrypt/src/encauth/eax/eax_encrypt_authenticate_memory.c @ 1648:48c6e54f7281
Added signature for changeset 07b0d56d186d
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 23 Mar 2019 21:54:23 +0800 |
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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 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 |
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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) { |
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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) { |
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58 goto LBL_ERR; |
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59 } |
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60 |
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61 if ((err = eax_done(eax, tag, taglen)) != CRYPT_OK) { |
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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 |
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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 |
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78 /* ref: $Format:%D$ */ |
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79 /* git commit: $Format:%H$ */ |
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80 /* commit time: $Format:%ai$ */ |