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changes to mifare plus code (#706)

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drhatson 2018-10-31 18:46:12 +00:00 • committed by pwpiwi
commit 4b5d696c17
5 changed files with 175 additions and 52 deletions
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11
common/polarssl/libpcrypto.c
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@ -1,5 +1,6 @@
//-----------------------------------------------------------------------------
// Copyright (C) 2018 Merlok
// Copyright (C) 2018 drHatson
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
@ -45,7 +46,7 @@ int aes_decode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int l
return 0;
}
// NIST Special Publication 800-38B — Recommendation for block cipher modes of operation: The CMAC mode for authentication.
// NIST Special Publication 800-38B — Recommendation for block cipher modes of operation: The CMAC mode for authentication.
// https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_CMAC.pdf
int aes_cmac(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *mac, int length) {
memset(mac, 0x00, 16);
@ -53,16 +54,10 @@ int aes_cmac(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *mac, int length
if (iv)
memcpy(iiv, iv, 16);
// padding: ISO/IEC 9797-1 Message Authentication Codes (MACs) - Part 1: Mechanisms using a block cipher
uint8_t data[2049] = {0}; // length + 16
memcpy(data, input, length);
data[length] = 0x80;
int datalen = (length & 0xfffffff0) + 0x10;
// NIST 800-38B
aes_cmac128_context ctx;
aes_cmac128_starts(&ctx, key);
aes_cmac128_update(&ctx, data, datalen);
aes_cmac128_update(&ctx, input, length);
aes_cmac128_final(&ctx, mac);
return 0;