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comparison libtomcrypt/src/encauth/ocb3/ocb3_encrypt_authenticate_memory.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
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1470:8bba51a55704 1471:6dba84798cd5
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 */
9
10 /**
11 @file ocb3_encrypt_authenticate_memory.c
12 OCB implementation, encrypt block of memory, by Tom St Denis
13 */
14 #include "tomcrypt.h"
15
16 #ifdef LTC_OCB3_MODE
17
18 /**
19 Encrypt and generate an authentication code for a buffer of memory
20 @param cipher The index of the cipher desired
21 @param key The secret key
22 @param keylen The length of the secret key (octets)
23 @param nonce The session nonce (length of the block ciphers block size)
24 @param noncelen The length of the nonce (octets)
25 @param adata The AAD - additional associated data
26 @param adatalen The length of AAD (octets)
27 @param pt The plaintext
28 @param ptlen The length of the plaintext (octets)
29 @param ct [out] The ciphertext
30 @param tag [out] The authentication tag
31 @param taglen [in/out] The max size and resulting size of the authentication tag
32 @return CRYPT_OK if successful
33 */
34 int ocb3_encrypt_authenticate_memory(int cipher,
35 const unsigned char *key, unsigned long keylen,
36 const unsigned char *nonce, unsigned long noncelen,
37 const unsigned char *adata, unsigned long adatalen,
38 const unsigned char *pt, unsigned long ptlen,
39 unsigned char *ct,
40 unsigned char *tag, unsigned long *taglen)
41 {
42 int err;
43 ocb3_state *ocb;
44
45 LTC_ARGCHK(taglen != NULL);
46
47 /* allocate memory */
48 ocb = XMALLOC(sizeof(ocb3_state));
49 if (ocb == NULL) {
50 return CRYPT_MEM;
51 }
52
53 if ((err = ocb3_init(ocb, cipher, key, keylen, nonce, noncelen, *taglen)) != CRYPT_OK) {
54 goto LBL_ERR;
55 }
56
57 if (adata != NULL || adatalen != 0) {
58 if ((err = ocb3_add_aad(ocb, adata, adatalen)) != CRYPT_OK) {
59 goto LBL_ERR;
60 }
61 }
62
63 if ((err = ocb3_encrypt_last(ocb, pt, ptlen, ct)) != CRYPT_OK) {
64 goto LBL_ERR;
65 }
66
67 err = ocb3_done(ocb, tag, taglen);
68
69 LBL_ERR:
70 #ifdef LTC_CLEAN_STACK
71 zeromem(ocb, sizeof(ocb3_state));
72 #endif
73
74 XFREE(ocb);
75 return err;
76 }
77
78 #endif
79
80 /* ref: $Format:%D$ */
81 /* git commit: $Format:%H$ */
82 /* commit time: $Format:%ai$ */