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https://github.com/RfidResearchGroup/proxmark3.git
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79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2018 Merlok
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// Copyright (C) 2018 drHatson
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// crypto commands
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//-----------------------------------------------------------------------------
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#include "polarssl/libpcrypto.h"
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#include <polarssl/aes.h>
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#include <polarssl/aes_cmac128.h>
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// NIST Special Publication 800-38A — Recommendation for block cipher modes of operation: methods and techniques, 2001.
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int aes_encode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int length){
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uint8_t iiv[16] = {0};
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if (iv)
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memcpy(iiv, iv, 16);
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aes_context aes;
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aes_init(&aes);
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if (aes_setkey_enc(&aes, key, 128))
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return 1;
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if (aes_crypt_cbc(&aes, AES_ENCRYPT, length, iiv, input, output))
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return 2;
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aes_free(&aes);
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return 0;
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}
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int aes_decode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int length){
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uint8_t iiv[16] = {0};
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if (iv)
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memcpy(iiv, iv, 16);
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aes_context aes;
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aes_init(&aes);
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if (aes_setkey_dec(&aes, key, 128))
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return 1;
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if (aes_crypt_cbc(&aes, AES_DECRYPT, length, iiv, input, output))
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return 2;
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aes_free(&aes);
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return 0;
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}
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// NIST Special Publication 800-38B — Recommendation for block cipher modes of operation: The CMAC mode for authentication.
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// https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/AES_CMAC.pdf
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int aes_cmac(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *mac, int length) {
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memset(mac, 0x00, 16);
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uint8_t iiv[16] = {0};
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if (iv)
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memcpy(iiv, iv, 16);
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// NIST 800-38B
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aes_cmac128_context ctx;
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aes_cmac128_starts(&ctx, key);
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aes_cmac128_update(&ctx, input, length);
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aes_cmac128_final(&ctx, mac);
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return 0;
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}
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int aes_cmac8(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *mac, int length) {
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uint8_t cmac[16] = {0};
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memset(mac, 0x00, 8);
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int res = aes_cmac(iv, key, input, cmac, length);
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if (res)
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return res;
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for(int i = 0; i < 8; i++)
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mac[i] = cmac[i * 2 + 1];
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return 0;
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}
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