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annotate libtomcrypt/src/encauth/ocb3/ocb3_encrypt_authenticate_memory.c @ 1717:295377ecbf49

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Add DEVELOPING.md
author Matt Johnston <matt@ucc.asn.au>
date Mon, 15 Jun 2020 22:30:28 +0800
parents 6dba84798cd5
children
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1471
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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 ocb3_encrypt_authenticate_memory.c
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12 OCB implementation, encrypt 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_OCB3_MODE
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17
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18 /**
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19 Encrypt and generate an authentication code for a buffer of memory
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param nonce The session nonce (length of the block ciphers block size)
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24 @param noncelen The length of the nonce (octets)
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25 @param adata The AAD - additional associated data
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26 @param adatalen The length of AAD (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 authentication 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 ocb3_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 *adata, unsigned long adatalen,
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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 ocb3_state *ocb;
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44
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45 LTC_ARGCHK(taglen != NULL);
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46
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47 /* allocate memory */
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48 ocb = XMALLOC(sizeof(ocb3_state));
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49 if (ocb == NULL) {
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50 return CRYPT_MEM;
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51 }
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52
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53 if ((err = ocb3_init(ocb, cipher, key, keylen, nonce, noncelen, *taglen)) != 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 (adata != NULL || adatalen != 0) {
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58 if ((err = ocb3_add_aad(ocb, adata, adatalen)) != CRYPT_OK) {
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59 goto LBL_ERR;
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60 }
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61 }
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62
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63 if ((err = ocb3_encrypt_last(ocb, pt, ptlen, ct)) != 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 = ocb3_done(ocb, tag, taglen);
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68
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69 LBL_ERR:
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70 #ifdef LTC_CLEAN_STACK
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71 zeromem(ocb, sizeof(ocb3_state));
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72 #endif
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73
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74 XFREE(ocb);
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75 return err;
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76 }
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77
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78 #endif
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79
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80 /* ref: $Format:%D$ */
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81 /* git commit: $Format:%H$ */
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82 /* commit time: $Format:%ai$ */