hostapd/src/crypto/sha384.c
Jouni Malinen 12da39b389 crypto: Allow up to 10 fragments for hmac_sha*_vector()
This increases the limit of how many data fragments can be supported
with the internal HMAC implementation. The previous limit was hit with
some FT use cases.

Signed-off-by: Jouni Malinen <j@w1.fi>
2020-01-26 17:04:54 +02:00

104 lines
2.6 KiB
C

/*
* SHA-384 hash implementation and interface functions
* Copyright (c) 2003-2017, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "sha384.h"
#include "crypto.h"
/**
* hmac_sha384_vector - HMAC-SHA384 over data vector (RFC 2104)
* @key: Key for HMAC operations
* @key_len: Length of the key in bytes
* @num_elem: Number of elements in the data vector
* @addr: Pointers to the data areas
* @len: Lengths of the data blocks
* @mac: Buffer for the hash (48 bytes)
* Returns: 0 on success, -1 on failure
*/
int hmac_sha384_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
unsigned char k_pad[128]; /* padding - key XORd with ipad/opad */
unsigned char tk[48];
const u8 *_addr[11];
size_t _len[11], i;
if (num_elem > 10) {
/*
* Fixed limit on the number of fragments to avoid having to
* allocate memory (which could fail).
*/
return -1;
}
/* if key is longer than 128 bytes reset it to key = SHA384(key) */
if (key_len > 128) {
if (sha384_vector(1, &key, &key_len, tk) < 0)
return -1;
key = tk;
key_len = 48;
}
/* the HMAC_SHA384 transform looks like:
*
* SHA384(K XOR opad, SHA384(K XOR ipad, text))
*
* where K is an n byte key
* ipad is the byte 0x36 repeated 128 times
* opad is the byte 0x5c repeated 128 times
* and text is the data being protected */
/* start out by storing key in ipad */
os_memset(k_pad, 0, sizeof(k_pad));
os_memcpy(k_pad, key, key_len);
/* XOR key with ipad values */
for (i = 0; i < 128; i++)
k_pad[i] ^= 0x36;
/* perform inner SHA384 */
_addr[0] = k_pad;
_len[0] = 128;
for (i = 0; i < num_elem; i++) {
_addr[i + 1] = addr[i];
_len[i + 1] = len[i];
}
if (sha384_vector(1 + num_elem, _addr, _len, mac) < 0)
return -1;
os_memset(k_pad, 0, sizeof(k_pad));
os_memcpy(k_pad, key, key_len);
/* XOR key with opad values */
for (i = 0; i < 128; i++)
k_pad[i] ^= 0x5c;
/* perform outer SHA384 */
_addr[0] = k_pad;
_len[0] = 128;
_addr[1] = mac;
_len[1] = SHA384_MAC_LEN;
return sha384_vector(2, _addr, _len, mac);
}
/**
* hmac_sha384 - HMAC-SHA384 over data buffer (RFC 2104)
* @key: Key for HMAC operations
* @key_len: Length of the key in bytes
* @data: Pointers to the data area
* @data_len: Length of the data area
* @mac: Buffer for the hash (48 bytes)
* Returns: 0 on success, -1 on failure
*/
int hmac_sha384(const u8 *key, size_t key_len, const u8 *data,
size_t data_len, u8 *mac)
{
return hmac_sha384_vector(key, key_len, 1, &data, &data_len, mac);
}