1 // SPDX-License-Identifier: BSD-2-Clause
2 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 *
4 * LibTomCrypt is a library that provides various cryptographic
5 * algorithms in a highly modular and flexible manner.
6 *
7 * The library is free for all purposes without any express
8 * guarantee it works.
9 */
10
11 /* The implementation is based on:
12 * Public Domain poly1305 from Andrew Moon
13 * https://github.com/floodyberry/poly1305-donna
14 */
15
16 #include "tomcrypt_private.h"
17 #include <stdarg.h>
18
19 #ifdef LTC_POLY1305
20
21 /**
22 POLY1305 multiple blocks of memory to produce the authentication tag
23 @param key The secret key
24 @param keylen The length of the secret key (octets)
25 @param mac [out] Destination of the authentication tag
26 @param maclen [in/out] Max size and resulting size of authentication tag
27 @param in The data to POLY1305
28 @param inlen The length of the data to POLY1305 (octets)
29 @param ... tuples of (data,len) pairs to POLY1305, terminated with a (NULL,x) (x=don't care)
30 @return CRYPT_OK if successful
31 */
poly1305_memory_multi(const unsigned char * key,unsigned long keylen,unsigned char * mac,unsigned long * maclen,const unsigned char * in,unsigned long inlen,...)32 int poly1305_memory_multi(const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen, const unsigned char *in, unsigned long inlen, ...)
33 {
34 poly1305_state st;
35 int err;
36 va_list args;
37 const unsigned char *curptr;
38 unsigned long curlen;
39
40 LTC_ARGCHK(key != NULL);
41 LTC_ARGCHK(in != NULL);
42 LTC_ARGCHK(mac != NULL);
43 LTC_ARGCHK(maclen != NULL);
44
45 va_start(args, inlen);
46 curptr = in;
47 curlen = inlen;
48 if ((err = poly1305_init(&st, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
49 for (;;) {
50 if ((err = poly1305_process(&st, curptr, curlen)) != CRYPT_OK) { goto LBL_ERR; }
51 curptr = va_arg(args, const unsigned char*);
52 if (curptr == NULL) break;
53 curlen = va_arg(args, unsigned long);
54 }
55 err = poly1305_done(&st, mac, maclen);
56 LBL_ERR:
57 #ifdef LTC_CLEAN_STACK
58 zeromem(&st, sizeof(poly1305_state));
59 #endif
60 va_end(args);
61 return err;
62 }
63
64 #endif
65
66 /* ref: $Format:%D$ */
67 /* git commit: $Format:%H$ */
68 /* commit time: $Format:%ai$ */
69