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crypto: Optimize arc4_skip

This commit is contained in:
Denis Kenzior 2017-06-06 13:32:14 -05:00
parent 6c64ae3461
commit 7e2e965eb7
1 changed files with 16 additions and 3 deletions
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19
src/crypto.c
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@ -169,12 +169,15 @@ bool arc4_skip(const uint8_t *key, size_t key_len, size_t skip,
{ {
char skip_buf[1024]; char skip_buf[1024];
struct l_cipher *cipher; struct l_cipher *cipher;
struct iovec in_vec[2];
struct iovec out_vec[2];
bool r;
cipher = l_cipher_new(L_CIPHER_ARC4, key, key_len); cipher = l_cipher_new(L_CIPHER_ARC4, key, key_len);
if (!cipher) if (!cipher)
return false; return false;
while (skip > 0) { while (skip > sizeof(skip_buf)) {
size_t to_skip = size_t to_skip =
skip > sizeof(skip_buf) ? sizeof(skip_buf) : skip; skip > sizeof(skip_buf) ? sizeof(skip_buf) : skip;
@ -182,10 +185,20 @@ bool arc4_skip(const uint8_t *key, size_t key_len, size_t skip,
skip -= to_skip; skip -= to_skip;
} }
l_cipher_decrypt(cipher, in, out, len); in_vec[0].iov_base = skip_buf;
in_vec[0].iov_len = skip;
in_vec[1].iov_base = (void *) in;
in_vec[1].iov_len = len;
out_vec[0].iov_base = skip_buf;
out_vec[0].iov_len = skip;
out_vec[1].iov_base = out;
out_vec[1].iov_len = len;
r = l_cipher_decryptv(cipher, in_vec, 2, out_vec, 2);
l_cipher_free(cipher); l_cipher_free(cipher);
return true; return r;
} }
/* 802.11, Section 11.6.2, Table 11-4 */ /* 802.11, Section 11.6.2, Table 11-4 */