19bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt/* 29bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt * Counter with CBC-MAC (CCM) with AES 39bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt * 49bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt * Copyright (c) 2010-2012, Jouni Malinen <j@w1.fi> 59bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt * 69bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt * This software may be distributed under the terms of the BSD license. 79bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt * See README for more details. 89bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt */ 99bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 109bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt#include "includes.h" 119bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 129bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt#include "common.h" 139bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt#include "aes.h" 149bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt#include "aes_wrap.h" 159bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 169bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 179bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtstatic void xor_aes_block(u8 *dst, const u8 *src) 189bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 199bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u32 *d = (u32 *) dst; 209bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u32 *s = (u32 *) src; 219bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt *d++ ^= *s++; 229bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt *d++ ^= *s++; 239bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt *d++ ^= *s++; 249bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt *d++ ^= *s++; 259bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 269bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 279bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 289bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtstatic void aes_ccm_auth_start(void *aes, size_t M, size_t L, const u8 *nonce, 299bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt const u8 *aad, size_t aad_len, size_t plain_len, 309bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 *x) 319bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 329bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 aad_buf[2 * AES_BLOCK_SIZE]; 339bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 b[AES_BLOCK_SIZE]; 349bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 359bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* Authentication */ 369bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* B_0: Flags | Nonce N | l(m) */ 379bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt b[0] = aad_len ? 0x40 : 0 /* Adata */; 389bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt b[0] |= (((M - 2) / 2) /* M' */ << 3); 399bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt b[0] |= (L - 1) /* L' */; 409bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt os_memcpy(&b[1], nonce, 15 - L); 419bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt WPA_PUT_BE16(&b[AES_BLOCK_SIZE - L], plain_len); 429bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 439bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt wpa_hexdump_key(MSG_EXCESSIVE, "CCM B_0", b, AES_BLOCK_SIZE); 449bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, b, x); /* X_1 = E(K, B_0) */ 459bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 469bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (!aad_len) 479bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return; 489bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 499bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt WPA_PUT_BE16(aad_buf, aad_len); 509bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt os_memcpy(aad_buf + 2, aad, aad_len); 519bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt os_memset(aad_buf + 2 + aad_len, 0, sizeof(aad_buf) - 2 - aad_len); 529bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 539bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt xor_aes_block(aad_buf, x); 549bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, aad_buf, x); /* X_2 = E(K, X_1 XOR B_1) */ 559bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 569bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (aad_len > AES_BLOCK_SIZE - 2) { 579bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt xor_aes_block(&aad_buf[AES_BLOCK_SIZE], x); 589bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* X_3 = E(K, X_2 XOR B_2) */ 599bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, &aad_buf[AES_BLOCK_SIZE], x); 609bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 619bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 629bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 639bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 649bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtstatic void aes_ccm_auth(void *aes, const u8 *data, size_t len, u8 *x) 659bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 669bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt size_t last = len % AES_BLOCK_SIZE; 679bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt size_t i; 689bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 699bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt for (i = 0; i < len / AES_BLOCK_SIZE; i++) { 709bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* X_i+1 = E(K, X_i XOR B_i) */ 719bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt xor_aes_block(x, data); 729bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt data += AES_BLOCK_SIZE; 739bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, x, x); 749bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 759bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (last) { 769bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* XOR zero-padded last block */ 779bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt for (i = 0; i < last; i++) 789bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt x[i] ^= *data++; 799bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, x, x); 809bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 819bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 829bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 839bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 849bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtstatic void aes_ccm_encr_start(size_t L, const u8 *nonce, u8 *a) 859bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 869bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* A_i = Flags | Nonce N | Counter i */ 879bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt a[0] = L - 1; /* Flags = L' */ 889bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt os_memcpy(&a[1], nonce, 15 - L); 899bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 909bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 919bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 929bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtstatic void aes_ccm_encr(void *aes, size_t L, const u8 *in, size_t len, u8 *out, 939bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 *a) 949bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 959bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt size_t last = len % AES_BLOCK_SIZE; 969bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt size_t i; 979bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 989bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* crypt = msg XOR (S_1 | S_2 | ... | S_n) */ 999bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt for (i = 1; i <= len / AES_BLOCK_SIZE; i++) { 1009bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt WPA_PUT_BE16(&a[AES_BLOCK_SIZE - 2], i); 1019bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* S_i = E(K, A_i) */ 1029bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, a, out); 1039bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt xor_aes_block(out, in); 1049bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt out += AES_BLOCK_SIZE; 1059bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt in += AES_BLOCK_SIZE; 1069bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 1079bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (last) { 1089bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt WPA_PUT_BE16(&a[AES_BLOCK_SIZE - 2], i); 1099bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, a, out); 1109bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* XOR zero-padded last block */ 1119bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt for (i = 0; i < last; i++) 1129bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt *out++ ^= *in++; 1139bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 1149bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 1159bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1169bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1179bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtstatic void aes_ccm_encr_auth(void *aes, size_t M, u8 *x, u8 *a, u8 *auth) 1189bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 1199bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt size_t i; 1209bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 tmp[AES_BLOCK_SIZE]; 1219bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1229bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt wpa_hexdump_key(MSG_EXCESSIVE, "CCM T", x, M); 1239bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* U = T XOR S_0; S_0 = E(K, A_0) */ 1249bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt WPA_PUT_BE16(&a[AES_BLOCK_SIZE - 2], 0); 1259bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, a, tmp); 1269bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt for (i = 0; i < M; i++) 1279bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt auth[i] = x[i] ^ tmp[i]; 1289bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt wpa_hexdump_key(MSG_EXCESSIVE, "CCM U", auth, M); 1299bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 1309bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1319bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1329bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtstatic void aes_ccm_decr_auth(void *aes, size_t M, u8 *a, const u8 *auth, u8 *t) 1339bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 1349bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt size_t i; 1359bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 tmp[AES_BLOCK_SIZE]; 1369bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1379bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt wpa_hexdump_key(MSG_EXCESSIVE, "CCM U", auth, M); 1389bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* U = T XOR S_0; S_0 = E(K, A_0) */ 1399bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt WPA_PUT_BE16(&a[AES_BLOCK_SIZE - 2], 0); 1409bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt(aes, a, tmp); 1419bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt for (i = 0; i < M; i++) 1429bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt t[i] = auth[i] ^ tmp[i]; 1439bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt wpa_hexdump_key(MSG_EXCESSIVE, "CCM T", t, M); 1449bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 1459bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1469bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1479bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt/* AES-CCM with fixed L=2 and aad_len <= 30 assumption */ 1489bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtint aes_ccm_ae(const u8 *key, size_t key_len, const u8 *nonce, 1499bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt size_t M, const u8 *plain, size_t plain_len, 1509bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt const u8 *aad, size_t aad_len, u8 *crypt, u8 *auth) 1519bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 1529bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt const size_t L = 2; 1539bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt void *aes; 1549bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE]; 1559bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1569bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (aad_len > 30 || M > AES_BLOCK_SIZE) 1579bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return -1; 1589bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1599bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes = aes_encrypt_init(key, key_len); 1609bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (aes == NULL) 1619bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return -1; 1629bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1639bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_auth_start(aes, M, L, nonce, aad, aad_len, plain_len, x); 1649bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_auth(aes, plain, plain_len, x); 1659bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1669bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* Encryption */ 1679bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_encr_start(L, nonce, a); 1689bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_encr(aes, L, plain, plain_len, crypt, a); 1699bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_encr_auth(aes, M, x, a, auth); 1709bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1719bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt_deinit(aes); 1729bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1739bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return 0; 1749bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 1759bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1769bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1779bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt/* AES-CCM with fixed L=2 and aad_len <= 30 assumption */ 1789bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidtint aes_ccm_ad(const u8 *key, size_t key_len, const u8 *nonce, 1799bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt size_t M, const u8 *crypt, size_t crypt_len, 1809bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt const u8 *aad, size_t aad_len, const u8 *auth, u8 *plain) 1819bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt{ 1829bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt const size_t L = 2; 1839bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt void *aes; 1849bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 x[AES_BLOCK_SIZE], a[AES_BLOCK_SIZE]; 1859bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt u8 t[AES_BLOCK_SIZE]; 1869bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1879bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (aad_len > 30 || M > AES_BLOCK_SIZE) 1889bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return -1; 1899bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1909bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes = aes_encrypt_init(key, key_len); 1919bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (aes == NULL) 1929bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return -1; 1939bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1949bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* Decryption */ 1959bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_encr_start(L, nonce, a); 1969bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_decr_auth(aes, M, a, auth, t); 1979bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 1989bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt /* plaintext = msg XOR (S_1 | S_2 | ... | S_n) */ 1999bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_encr(aes, L, crypt, crypt_len, plain, a); 2009bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 2019bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_auth_start(aes, M, L, nonce, aad, aad_len, crypt_len, x); 2029bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_ccm_auth(aes, plain, crypt_len, x); 2039bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 2049bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt aes_encrypt_deinit(aes); 2059bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 2069bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt if (os_memcmp(x, t, M) != 0) { 2079bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt wpa_printf(MSG_EXCESSIVE, "CCM: Auth mismatch"); 2089bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return -1; 2099bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt } 2109bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt 2119bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt return 0; 2129bce59c7fef20e34a05f04d1e33a4076083dca0cDmitry Shmidt} 213