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Mfp read plain (#704)

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* added aes-cmac-128
* aes-cmac added to cryptosystem. not works(
This commit is contained in:
Oleg Moiseenko 2018-10-26 20:18:53 +03:00 • committed by pwpiwi
commit c8a0f55031
10 changed files with 836 additions and 10 deletions
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41
common/polarssl/libpcrypto.c
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@ -10,7 +10,9 @@
#include "polarssl/libpcrypto.h"
#include <polarssl/aes.h>
#include <polarssl/aes_cmac128.h>
// NIST Special Publication 800-38A — Recommendation for block cipher modes of operation: methods and techniques, 2001.
int aes_encode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int length){
uint8_t iiv[16] = {0};
if (iv)
@ -41,4 +43,41 @@ int aes_decode(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int l
aes_free(&aes);
return 0;
}
}
// 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);
uint8_t iiv[16] = {0};
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_final(&ctx, mac);
return 0;
}
int aes_cmac8(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *mac, int length) {
uint8_t cmac[16] = {0};
memset(mac, 0x00, 8);
int res = aes_cmac(iv, key, input, cmac, length);
if (res)
return res;
for(int i = 0; i < 8; i++)
mac[i] = cmac[i * 2 + 1];
return 0;
}