Lucas/lilcrypto
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use a single zero buffer

Browse Source
This commit is contained in:
Lucas Gabriel Vuotto 2024-06-19 13:18:25 +00:00
parent 8fd513540f
commit 3c5e296178
4 changed files with 20 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
aead_chacha20_poly1305.c
View File

@ -23,8 +23,6 @@
* according to draft-irtf-cfrg-xchacha-03. * according to draft-irtf-cfrg-xchacha-03.
*/ */
static const uint8_t zeropad[16];
static int static int
chacha20_xchacha20_keysetup(struct lc_cipher_ctx *cctx, chacha20_xchacha20_keysetup(struct lc_cipher_ctx *cctx,
uint8_t akey[LC_POLY1305_KEYLEN], void *initparams) uint8_t akey[LC_POLY1305_KEYLEN], void *initparams)
@ -94,7 +92,7 @@ chacha20_poly1305_seal(uint8_t *out, size_t *outlen, void *initparams,
!lc_auth_update(actx, aad, aadlen)) !lc_auth_update(actx, aad, aadlen))
goto cleanup; goto cleanup;
if (aadlen % 16 != 0) if (aadlen % 16 != 0)
if (!lc_auth_update(actx, zeropad, 16 - (aadlen % 16))) if (!lc_auth_update(actx, zerobuf, 16 - (aadlen % 16)))
goto cleanup; goto cleanup;
cparams.counter = 1; cparams.counter = 1;
@ -111,7 +109,7 @@ chacha20_poly1305_seal(uint8_t *out, size_t *outlen, void *initparams,
if (!lc_auth_update(actx, out, inlen)) if (!lc_auth_update(actx, out, inlen))
goto cleanup; goto cleanup;
if (inlen % 16 != 0) if (inlen % 16 != 0)
if (!lc_auth_update(actx, zeropad, 16 - (inlen % 16))) if (!lc_auth_update(actx, zerobuf, 16 - (inlen % 16)))
goto cleanup; goto cleanup;
store64le(&buf[0], aadlen); store64le(&buf[0], aadlen);
@ -183,7 +181,7 @@ xchacha20_poly1305_seal(uint8_t *out, size_t *outlen, void *initparams,
!lc_auth_update(actx, aad, aadlen)) !lc_auth_update(actx, aad, aadlen))
goto cleanup; goto cleanup;
if (aadlen % 16 != 0) if (aadlen % 16 != 0)
if (!lc_auth_update(actx, zeropad, 16 - (aadlen % 16))) if (!lc_auth_update(actx, zerobuf, 16 - (aadlen % 16)))
goto cleanup; goto cleanup;
cparams.counter = 1; cparams.counter = 1;
@ -200,7 +198,7 @@ xchacha20_poly1305_seal(uint8_t *out, size_t *outlen, void *initparams,
if (!lc_auth_update(actx, out, inlen)) if (!lc_auth_update(actx, out, inlen))
goto cleanup; goto cleanup;
if (inlen % 16 != 0) if (inlen % 16 != 0)
if (!lc_auth_update(actx, zeropad, 16 - (inlen % 16))) if (!lc_auth_update(actx, zerobuf, 16 - (inlen % 16)))
goto cleanup; goto cleanup;
store64le(&buf[0], aadlen); store64le(&buf[0], aadlen);
@ -274,14 +272,14 @@ chacha20_poly1305_open(uint8_t *out, size_t *outlen, void *initparams,
!lc_auth_update(actx, aad, aadlen)) !lc_auth_update(actx, aad, aadlen))
goto cleanup; goto cleanup;
if (aadlen % 16 != 0) if (aadlen % 16 != 0)
if (!lc_auth_update(actx, zeropad, 16 - (aadlen % 16))) if (!lc_auth_update(actx, zerobuf, 16 - (aadlen % 16)))
goto cleanup; goto cleanup;
ctlen = inlen - LC_POLY1305_TAGLEN; ctlen = inlen - LC_POLY1305_TAGLEN;
if (!lc_auth_update(actx, in, ctlen)) if (!lc_auth_update(actx, in, ctlen))
goto cleanup; goto cleanup;
if (ctlen % 16 != 0) if (ctlen % 16 != 0)
if (!lc_auth_update(actx, zeropad, 16 - (ctlen % 16))) if (!lc_auth_update(actx, zerobuf, 16 - (ctlen % 16)))
goto cleanup; goto cleanup;
store64le(&buf[0], aadlen); store64le(&buf[0], aadlen);
@ -369,14 +367,14 @@ xchacha20_poly1305_open(uint8_t *out, size_t *outlen, void *initparams,
!lc_auth_update(actx, aad, aadlen)) !lc_auth_update(actx, aad, aadlen))
goto cleanup; goto cleanup;
if (aadlen % 16 != 0) if (aadlen % 16 != 0)
if (!lc_auth_update(actx, zeropad, 16 - (aadlen % 16))) if (!lc_auth_update(actx, zerobuf, 16 - (aadlen % 16)))
goto cleanup; goto cleanup;
ctlen = inlen - LC_POLY1305_TAGLEN; ctlen = inlen - LC_POLY1305_TAGLEN;
if (!lc_auth_update(actx, in, ctlen)) if (!lc_auth_update(actx, in, ctlen))
goto cleanup; goto cleanup;
if (ctlen % 16 != 0) if (ctlen % 16 != 0)
if (!lc_auth_update(actx, zeropad, 16 - (ctlen % 16))) if (!lc_auth_update(actx, zerobuf, 16 - (ctlen % 16)))
goto cleanup; goto cleanup;
store64le(&buf[0], aadlen); store64le(&buf[0], aadlen);

8
internal.h
View File

@ -208,4 +208,12 @@ void sha256_block(struct sha256_state *);
void sha512_block(struct sha512_state *); void sha512_block(struct sha512_state *);
/*
* VARIABLES
*/
extern uint8_t zerobuf[128];
#endif /* LC_INTERNAL_H */ #endif /* LC_INTERNAL_H */

5
kdf_hkdf.c
View File

@ -19,9 +19,6 @@
#include "internal.h" #include "internal.h"
static uint8_t zeros[HMAC_HASHLEN_MAX];
static int static int
hkdf_kdf(uint8_t *out, size_t *outlen, void *initparams, size_t len) hkdf_kdf(uint8_t *out, size_t *outlen, void *initparams, size_t len)
{ {
@ -51,7 +48,7 @@ hkdf_kdf(uint8_t *out, size_t *outlen, void *initparams, size_t len)
hmacparams.hash = params->hash; hmacparams.hash = params->hash;
if (params->saltlen == 0) { if (params->saltlen == 0) {
hmacparams.key = zeros; hmacparams.key = zerobuf;
hmacparams.keylen = hashlen; hmacparams.keylen = hashlen;
} else { } else {
hmacparams.key = params->salt; hmacparams.key = params->salt;

3
util.c
View File

@ -23,6 +23,9 @@
#define HEXDUMP_BUFSZ 128 #define HEXDUMP_BUFSZ 128
uint8_t zerobuf[128] = { 0 };
static size_t static size_t
hexdump_line(char *buf, const uint8_t *blob, size_t len, size_t off, int pad) hexdump_line(char *buf, const uint8_t *blob, size_t len, size_t off, int pad)
{ {