ESP-IDF
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Outline
#include "utils/includes.h"
#include "utils/common.h"
#include "common/ieee802_11_defs.h"
#include "crypto/aes.h"
#include "crypto/aes_wrap.h"
ccmp_aad_nonce(const struct ieee80211_hdr *, const u8 *, u8 *, size_t *, u8 *)
ccmp_aad_nonce_pv1(const u8 *, const u8 *, const u8 *, const u8 *, const u8 *, u8 *, size_t *, u8 *)
ccmp_decrypt(const u8 *, const u8 *, const u8 *, size_t, size_t *, bool)
ccmp_get_pn(u8 *, const u8 *)
ccmp_encrypt(const u8 *, u8 *, size_t, size_t, u8 *, int, size_t *)
ccmp_encrypt_pv1(const u8 *, const u8 *, const u8 *, const u8 *, const u8 *, size_t, size_t, const u8 *, int, size_t *)
ccmp_256_decrypt(const u8 *, const u8 *, const u8 *, size_t, size_t *)
ccmp_256_encrypt(const u8 *, u8 *, size_t, size_t, u8 *, int, size_t *)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/wpa_supplicant/src/crypto/ccmp.c
 
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/* * CTR with CBC-MAC Protocol (CCMP) * Copyright (c) 2010-2012, Jouni Malinen <j@w1.fi> * * This software may be distributed under the terms of the BSD license. * See README for more details. *//* ... */ #ifdef CONFIG_IEEE80211W #include "utils/includes.h" #include "utils/common.h" #include "common/ieee802_11_defs.h" #include "crypto/aes.h" #include "crypto/aes_wrap.h"5 includes static void ccmp_aad_nonce(const struct ieee80211_hdr *hdr, const u8 *data, u8 *aad, size_t *aad_len, u8 *nonce) { u16 fc, stype, seq; int qos = 0, addr4 = 0; u8 *pos; nonce[0] = 0; fc = le_to_host16(hdr->frame_control); stype = WLAN_FC_GET_STYPE(fc); if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == (WLAN_FC_TODS | WLAN_FC_FROMDS)) addr4 = 1; if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA) { fc &= ~0x0070; /* Mask subtype bits */ if (stype & 0x08) { const u8 *qc; qos = 1; fc &= ~WLAN_FC_ORDER; qc = (const u8 *) (hdr + 1); if (addr4) qc += ETH_ALEN; nonce[0] = qc[0] & 0x0f; }{...} }{...} else if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT) nonce[0] |= 0x10; /* Management */ fc &= ~(WLAN_FC_RETRY | WLAN_FC_PWRMGT | WLAN_FC_MOREDATA); fc |= WLAN_FC_ISWEP; WPA_PUT_LE16(aad, fc); pos = aad + 2; os_memcpy(pos, hdr->addr1, 3 * ETH_ALEN); pos += 3 * ETH_ALEN; seq = le_to_host16(hdr->seq_ctrl); seq &= ~0xfff0; /* Mask Seq#; do not modify Frag# */ WPA_PUT_LE16(pos, seq); pos += 2; os_memcpy(pos, hdr + 1, addr4 * ETH_ALEN + qos * 2); pos += addr4 * ETH_ALEN; if (qos) { pos[0] &= ~0x70; if (1 /* FIX: either device has SPP A-MSDU Capab = 0 */) pos[0] &= ~0x80; pos++; *pos++ = 0x00; }{...} *aad_len = pos - aad; os_memcpy(nonce + 1, hdr->addr2, ETH_ALEN); nonce[7] = data[7]; /* PN5 */ nonce[8] = data[6]; /* PN4 */ nonce[9] = data[5]; /* PN3 */ nonce[10] = data[4]; /* PN2 */ nonce[11] = data[1]; /* PN1 */ nonce[12] = data[0]; /* PN0 */ }{ ... } static void ccmp_aad_nonce_pv1(const u8 *hdr, const u8 *a1, const u8 *a2, const u8 *a3, const u8 *pn, u8 *aad, size_t *aad_len, u8 *nonce) { u16 fc, type; u8 *pos; nonce[0] = BIT(5); /* PV1 */ /* TODO: Priority for QMF; 0 is used for Data frames */ fc = WPA_GET_LE16(hdr); type = (fc & (BIT(2) | BIT(3) | BIT(4))) >> 2; if (type == 1) nonce[0] |= 0x10; /* Management */ fc &= ~(BIT(10) | BIT(11) | BIT(13) | BIT(14) | BIT(15)); fc |= BIT(12); WPA_PUT_LE16(aad, fc); pos = aad + 2; if (type == 0 || type == 3) { const u8 *sc; os_memcpy(pos, a1, ETH_ALEN); pos += ETH_ALEN; os_memcpy(pos, a2, ETH_ALEN); pos += ETH_ALEN; if (type == 0) { /* Either A1 or A2 contains SID */ sc = hdr + 2 + 2 + ETH_ALEN; }{...} else { /* Both A1 and A2 contain full addresses */ sc = hdr + 2 + 2 * ETH_ALEN; }{...} /* SC with Sequence Number subfield (bits 4-15 of the Sequence * Control field) masked to 0. *//* ... */ *pos++ = *sc & 0x0f; *pos++ = 0; if (a3) { os_memcpy(pos, a3, ETH_ALEN); pos += ETH_ALEN; }{...} }{...} *aad_len = pos - aad; os_memcpy(nonce + 1, a2, ETH_ALEN); nonce[7] = pn[5]; /* PN5 */ nonce[8] = pn[4]; /* PN4 */ nonce[9] = pn[3]; /* PN3 */ nonce[10] = pn[2]; /* PN2 */ nonce[11] = pn[1]; /* PN1 */ nonce[12] = pn[0]; /* PN0 */ }{ ... } u8 * ccmp_decrypt(const u8 *tk, const u8 *hdr, const u8 *data, size_t data_len, size_t *decrypted_len, bool espnow_pkt) { u8 aad[30], nonce[13]; size_t aad_len; size_t mlen; size_t tag_len = 8; u8 *plain; if (data_len < 8 + 8) return NULL; plain = os_malloc(data_len + AES_BLOCK_SIZE); if (plain == NULL) return NULL; mlen = data_len - 8 - 8; os_memset(aad, 0, sizeof(aad)); ccmp_aad_nonce((const struct ieee80211_hdr *)hdr, data, aad, &aad_len, nonce); wpa_hexdump(MSG_MSGDUMP, "CCMP AAD", aad, aad_len); wpa_hexdump(MSG_MSGDUMP, "CCMP nonce", nonce, 13); #ifdef ESPRESSIF_USE if (espnow_pkt) { tag_len = 0; nonce[0] = 0; }{...} #endif/* ... */ if (aes_ccm_ad(tk, 16, nonce, tag_len, data + 8, mlen, aad, aad_len, data + 8 + mlen, plain) < 0) { os_free(plain); return NULL; }{...} wpa_hexdump(MSG_MSGDUMP, "CCMP decrypted", plain, mlen); *decrypted_len = mlen; return plain; }{ ... } void ccmp_get_pn(u8 *pn, const u8 *data) { pn[0] = data[7]; /* PN5 */ pn[1] = data[6]; /* PN4 */ pn[2] = data[5]; /* PN3 */ pn[3] = data[4]; /* PN2 */ pn[4] = data[1]; /* PN1 */ pn[5] = data[0]; /* PN0 */ }{ ... } u8 * ccmp_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *pn, int keyid, size_t *encrypted_len) { u8 aad[30], nonce[13]; size_t aad_len, plen; u8 *crypt, *pos; struct ieee80211_hdr *hdr; if (len < hdrlen || hdrlen < 24) return NULL; plen = len - hdrlen; crypt = os_malloc(hdrlen + 8 + plen + 8 + AES_BLOCK_SIZE); if (crypt == NULL) return NULL; os_memcpy(crypt, frame, hdrlen); hdr = (struct ieee80211_hdr *) crypt; hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP); pos = crypt + hdrlen; *pos++ = pn[5]; /* PN0 */ *pos++ = pn[4]; /* PN1 */ *pos++ = 0x00; /* Rsvd */ *pos++ = 0x20 | (keyid << 6); *pos++ = pn[3]; /* PN2 */ *pos++ = pn[2]; /* PN3 */ *pos++ = pn[1]; /* PN4 */ *pos++ = pn[0]; /* PN5 */ os_memset(aad, 0, sizeof(aad)); ccmp_aad_nonce(hdr, crypt + hdrlen, aad, &aad_len, nonce); wpa_hexdump(MSG_MSGDUMP, "CCMP AAD", aad, aad_len); wpa_hexdump(MSG_MSGDUMP, "CCMP nonce", nonce, 13); if (aes_ccm_ae(tk, 16, nonce, 8, frame + hdrlen + 8, plen, aad, aad_len, pos, pos + plen) < 0) { wpa_printf(MSG_ERROR, "aes ccm ae failed"); os_free(crypt); return NULL; }{...} wpa_hexdump(MSG_MSGDUMP, "CCMP encrypted", crypt + hdrlen + 8, plen); *encrypted_len = hdrlen + 8 + plen + 8; return crypt; }{ ... } u8 * ccmp_encrypt_pv1(const u8 *tk, const u8 *a1, const u8 *a2, const u8 *a3, const u8 *frame, size_t len, size_t hdrlen, const u8 *pn, int keyid, size_t *encrypted_len) { u8 aad[24], nonce[13]; size_t aad_len, plen; u8 *crypt, *pos; struct ieee80211_hdr *hdr; if (len < hdrlen || hdrlen < 12) return NULL; plen = len - hdrlen; crypt = os_malloc(hdrlen + plen + 8 + AES_BLOCK_SIZE); if (crypt == NULL) return NULL; os_memcpy(crypt, frame, hdrlen); hdr = (struct ieee80211_hdr *) crypt; hdr->frame_control |= host_to_le16(BIT(12)); /* Protected Frame */ pos = crypt + hdrlen; os_memset(aad, 0, sizeof(aad)); ccmp_aad_nonce_pv1(crypt, a1, a2, a3, pn, aad, &aad_len, nonce); wpa_hexdump(MSG_DEBUG, "CCMP AAD", aad, aad_len); wpa_hexdump(MSG_DEBUG, "CCMP nonce", nonce, sizeof(nonce)); if (aes_ccm_ae(tk, 16, nonce, 8, frame + hdrlen, plen, aad, aad_len, pos, pos + plen) < 0) { os_free(crypt); return NULL; }{...} wpa_hexdump(MSG_DEBUG, "CCMP encrypted", crypt + hdrlen, plen); *encrypted_len = hdrlen + plen + 8; return crypt; }{ ... } u8 * ccmp_256_decrypt(const u8 *tk, const u8 *hdr, const u8 *data, size_t data_len, size_t *decrypted_len) { u8 aad[30], nonce[13]; size_t aad_len; size_t mlen; u8 *plain; if (data_len < 8 + 16) return NULL; plain = os_malloc(data_len + AES_BLOCK_SIZE); if (plain == NULL) return NULL; mlen = data_len - 8 - 16; os_memset(aad, 0, sizeof(aad)); ccmp_aad_nonce((const struct ieee80211_hdr *)hdr, data, aad, &aad_len, nonce); wpa_hexdump(MSG_DEBUG, "CCMP-256 AAD", aad, aad_len); wpa_hexdump(MSG_DEBUG, "CCMP-256 nonce", nonce, 13); if (aes_ccm_ad(tk, 32, nonce, 16, data + 8, mlen, aad, aad_len, data + 8 + mlen, plain) < 0) { os_free(plain); return NULL; }{...} wpa_hexdump(MSG_DEBUG, "CCMP-256 decrypted", plain, mlen); *decrypted_len = mlen; return plain; }{ ... } u8 * ccmp_256_encrypt(const u8 *tk, u8 *frame, size_t len, size_t hdrlen, u8 *pn, int keyid, size_t *encrypted_len) { u8 aad[30], nonce[13]; size_t aad_len, plen; u8 *crypt, *pos; struct ieee80211_hdr *hdr; if (len < hdrlen || hdrlen < 24) return NULL; plen = len - hdrlen; crypt = os_malloc(hdrlen + 8 + plen + 16 + AES_BLOCK_SIZE); if (crypt == NULL) return NULL; os_memcpy(crypt, frame, hdrlen); hdr = (struct ieee80211_hdr *) crypt; hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP); pos = crypt + hdrlen; *pos++ = pn[5]; /* PN0 */ *pos++ = pn[4]; /* PN1 */ *pos++ = 0x00; /* Rsvd */ *pos++ = 0x20 | (keyid << 6); *pos++ = pn[3]; /* PN2 */ *pos++ = pn[2]; /* PN3 */ *pos++ = pn[1]; /* PN4 */ *pos++ = pn[0]; /* PN5 */ os_memset(aad, 0, sizeof(aad)); ccmp_aad_nonce(hdr, crypt + hdrlen, aad, &aad_len, nonce); wpa_hexdump(MSG_DEBUG, "CCMP-256 AAD", aad, aad_len); wpa_hexdump(MSG_DEBUG, "CCMP-256 nonce", nonce, 13); if (aes_ccm_ae(tk, 32, nonce, 16, frame + hdrlen, plen, aad, aad_len, pos, pos + plen) < 0) { os_free(crypt); return NULL; }{...} wpa_hexdump(MSG_DEBUG, "CCMP-256 encrypted", crypt + hdrlen + 8, plen); *encrypted_len = hdrlen + 8 + plen + 16; return crypt; }{ ... } #endif/* ... */ /* CONFIG_IEEE80211W */
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