264 lines
6.7 KiB
C
264 lines
6.7 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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/* Auto-detection of AES implementation by Steffen Jaeckel */
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/**
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@file aes_desc.c
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Run-time detection of correct AES implementation
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*/
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#include "tomcrypt_private.h"
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#if defined(LTC_RIJNDAEL)
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#ifndef ENCRYPT_ONLY
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#define AES_SETUP aes_setup
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#define AES_ENC aes_ecb_encrypt
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#define AES_DEC aes_ecb_decrypt
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#define AES_DONE aes_done
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#define AES_TEST aes_test
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#define AES_KS aes_keysize
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const struct ltc_cipher_descriptor aes_desc =
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{
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"aes",
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6,
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16, 32, 16, 10,
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AES_SETUP, AES_ENC, AES_DEC, AES_TEST, AES_DONE, AES_KS,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
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};
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#else
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#define AES_SETUP aes_enc_setup
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#define AES_ENC aes_enc_ecb_encrypt
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#define AES_DONE aes_enc_done
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#define AES_TEST aes_enc_test
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#define AES_KS aes_enc_keysize
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const struct ltc_cipher_descriptor aes_enc_desc =
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{
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"aes",
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6,
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16, 32, 16, 10,
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AES_SETUP, AES_ENC, NULL, NULL, AES_DONE, AES_KS,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
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};
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#endif
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/* Code partially borrowed from https://software.intel.com/content/www/us/en/develop/articles/intel-sha-extensions.html */
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#if defined(LTC_AES_NI)
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static LTC_INLINE int s_aesni_is_supported(void)
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{
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static int initialized = 0, is_supported = 0;
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if (initialized == 0) {
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int a, b, c, d;
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/* Look for CPUID.1.0.ECX[19] (SSE4.1) and CPUID.1.0.ECX[25] (AES-NI)
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* EAX = 1, ECX = 0
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*/
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a = 1;
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c = 0;
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#if defined(_MSC_VER) && !defined(__clang__)
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int arr[4];
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__cpuidex(arr, a, c);
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a = arr[0];
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b = arr[1];
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c = arr[2];
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d = arr[3];
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#else
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__asm__ volatile ("cpuid"
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:"=a"(a), "=b"(b), "=c"(c), "=d"(d)
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:"a"(a), "c"(c)
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);
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#endif
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is_supported = ((c >> 19) & 1) && ((c >> 25) & 1);
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initialized = 1;
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}
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return is_supported;
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}
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#ifndef ENCRYPT_ONLY
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int aesni_is_supported(void)
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{
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return s_aesni_is_supported();
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}
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#endif
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#endif
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/**
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Initialize the AES (Rijndael) block cipher
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@param key The symmetric key you wish to pass
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@param keylen The key length in bytes
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@param num_rounds The number of rounds desired (0 for default)
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@param skey The key in as scheduled by this function.
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@return CRYPT_OK if successful
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*/
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int AES_SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
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{
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#ifdef LTC_AES_NI
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if (s_aesni_is_supported()) {
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return aesni_setup(key, keylen, num_rounds, skey);
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}
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#endif
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/* Last resort, software AES */
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return rijndael_setup(key, keylen, num_rounds, skey);
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}
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/**
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Encrypts a block of text with AES
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@param pt The input plaintext (16 bytes)
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@param ct The output ciphertext (16 bytes)
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@param skey The key as scheduled
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@return CRYPT_OK if successful
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*/
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int AES_ENC(const unsigned char *pt, unsigned char *ct, const symmetric_key *skey)
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{
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#ifdef LTC_AES_NI
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if (s_aesni_is_supported()) {
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return aesni_ecb_encrypt(pt, ct, skey);
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}
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#endif
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return rijndael_ecb_encrypt(pt, ct, skey);
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}
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#ifndef ENCRYPT_ONLY
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/**
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Decrypts a block of text with AES
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@param ct The input ciphertext (16 bytes)
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@param pt The output plaintext (16 bytes)
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@param skey The key as scheduled
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@return CRYPT_OK if successful
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*/
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int AES_DEC(const unsigned char *ct, unsigned char *pt, const symmetric_key *skey)
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{
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#ifdef LTC_AES_NI
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if (s_aesni_is_supported()) {
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return aesni_ecb_decrypt(ct, pt, skey);
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}
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#endif
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return rijndael_ecb_decrypt(ct, pt, skey);
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}
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#endif /* ENCRYPT_ONLY */
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/**
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Performs a self-test of the AES block cipher
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@return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
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*/
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int AES_TEST(void)
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{
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#ifndef LTC_TEST
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return CRYPT_NOP;
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#else
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int err;
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static const struct {
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int keylen;
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unsigned char key[32], pt[16], ct[16];
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} tests[] = {
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{ 16,
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
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{ 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
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0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
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{ 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30,
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0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a }
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}, {
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24,
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
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{ 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
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0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
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{ 0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0,
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0x6e, 0xaf, 0x70, 0xa0, 0xec, 0x0d, 0x71, 0x91 }
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}, {
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32,
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
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{ 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
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0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
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{ 0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf,
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0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89 }
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}
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};
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symmetric_key key;
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unsigned char tmp[2][16];
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int i;
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#ifndef ENCRYPT_ONLY
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int y;
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#endif
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for (i = 0; i < (int)LTC_ARRAY_SIZE(tests); i++) {
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zeromem(&key, sizeof(key));
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if ((err = AES_SETUP(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {
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return err;
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}
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AES_ENC(tests[i].pt, tmp[0], &key);
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if (compare_testvector(tmp[0], 16, tests[i].ct, 16, "AES Encrypt", i)) {
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return CRYPT_FAIL_TESTVECTOR;
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}
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#ifndef ENCRYPT_ONLY
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AES_DEC(tmp[0], tmp[1], &key);
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if (compare_testvector(tmp[1], 16, tests[i].pt, 16, "AES Decrypt", i)) {
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return CRYPT_FAIL_TESTVECTOR;
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}
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/* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
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for (y = 0; y < 16; y++) tmp[0][y] = 0;
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for (y = 0; y < 1000; y++) AES_ENC(tmp[0], tmp[0], &key);
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for (y = 0; y < 1000; y++) AES_DEC(tmp[0], tmp[0], &key);
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for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
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#endif
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}
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return CRYPT_OK;
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#endif
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}
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/** Terminate the context
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@param skey The scheduled key
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*/
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void AES_DONE(symmetric_key *skey)
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{
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LTC_UNUSED_PARAM(skey);
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}
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/**
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Gets suitable key size
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@param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable.
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@return CRYPT_OK if the input key size is acceptable.
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*/
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int AES_KS(int *keysize)
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{
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LTC_ARGCHK(keysize != NULL);
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if (*keysize < 16) {
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return CRYPT_INVALID_KEYSIZE;
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}
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if (*keysize < 24) {
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*keysize = 16;
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return CRYPT_OK;
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}
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if (*keysize < 32) {
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*keysize = 24;
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return CRYPT_OK;
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}
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*keysize = 32;
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return CRYPT_OK;
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}
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#endif
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