ESP-IDF
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Outline
#include "utils/includes.h"
#include "utils/common.h"
#include "crypto/sha1.h"
#include "eap_peer/eap_peap_common.h"
peap_prfplus(int, const u8 *, size_t, const char *, const u8 *, size_t, u8 *, size_t)
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/wpa_supplicant/src/eap_peer/eap_peap_common.c
 
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/* * EAP-PEAP common routines * Copyright (c) 2008-2011, Jouni Malinen <j@w1.fi> * * This software may be distributed under the terms of the BSD license. * See README for more details. *//* ... */ #include "utils/includes.h" #ifdef EAP_PEAP #include "utils/common.h" #include "crypto/sha1.h" #include "eap_peer/eap_peap_common.h" int peap_prfplus(int version, const u8 *key, size_t key_len, const char *label, const u8 *seed, size_t seed_len, u8 *buf, size_t buf_len) { unsigned char counter = 0; size_t pos, plen; u8 hash[SHA1_MAC_LEN]; size_t label_len = os_strlen(label); u8 extra[2]; const unsigned char *addr[5]; size_t len[5]; addr[0] = hash; len[0] = 0; addr[1] = (unsigned char *) label; len[1] = label_len; addr[2] = seed; len[2] = seed_len; if (version == 0) { /* * PRF+(K, S, LEN) = T1 | T2 | ... | Tn * T1 = HMAC-SHA1(K, S | 0x01 | 0x00 | 0x00) * T2 = HMAC-SHA1(K, T1 | S | 0x02 | 0x00 | 0x00) * ... * Tn = HMAC-SHA1(K, Tn-1 | S | n | 0x00 | 0x00) *//* ... */ extra[0] = 0; extra[1] = 0; addr[3] = &counter; len[3] = 1; addr[4] = extra; len[4] = 2; }{...} else { /* * PRF (K,S,LEN) = T1 | T2 | T3 | T4 | ... where: * T1 = HMAC-SHA1(K, S | LEN | 0x01) * T2 = HMAC-SHA1 (K, T1 | S | LEN | 0x02) * T3 = HMAC-SHA1 (K, T2 | S | LEN | 0x03) * T4 = HMAC-SHA1 (K, T3 | S | LEN | 0x04) * ... *//* ... */ extra[0] = buf_len & 0xff; addr[3] = extra; len[3] = 1; addr[4] = &counter; len[4] = 1; }{...} pos = 0; while (pos < buf_len) { counter++; plen = buf_len - pos; if (hmac_sha1_vector(key, key_len, 5, addr, len, hash) < 0) return -1; if (plen >= SHA1_MAC_LEN) { os_memcpy(&buf[pos], hash, SHA1_MAC_LEN); pos += SHA1_MAC_LEN; }{...} else { os_memcpy(&buf[pos], hash, plen); break; }{...} len[0] = SHA1_MAC_LEN; }{...} return 0; }{ ... } /* ... */#endif /* EAP_PEAP */
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