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Diffstat (limited to 'src/ltc/ciphers/aes/aes_desc.c')
-rw-r--r--src/ltc/ciphers/aes/aes_desc.c244
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diff --git a/src/ltc/ciphers/aes/aes_desc.c b/src/ltc/ciphers/aes/aes_desc.c
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+/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
+
+/* Auto-detection of AES implementation by Steffen Jaeckel */
+/**
+ @file aes_desc.c
+ Run-time detection of correct AES implementation
+*/
+
+#include "tomcrypt_private.h"
+
+#if defined(LTC_RIJNDAEL)
+
+#ifndef ENCRYPT_ONLY
+
+#define AES_SETUP aes_setup
+#define AES_ENC aes_ecb_encrypt
+#define AES_DEC aes_ecb_decrypt
+#define AES_DONE aes_done
+#define AES_TEST aes_test
+#define AES_KS aes_keysize
+
+const struct ltc_cipher_descriptor aes_desc =
+{
+ "aes",
+ 6,
+ 16, 32, 16, 10,
+ AES_SETUP, AES_ENC, AES_DEC, AES_TEST, AES_DONE, AES_KS,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+};
+
+#else
+
+#define AES_SETUP aes_enc_setup
+#define AES_ENC aes_enc_ecb_encrypt
+#define AES_DONE aes_enc_done
+#define AES_KS aes_enc_keysize
+
+const struct ltc_cipher_descriptor aes_enc_desc =
+{
+ "aes",
+ 6,
+ 16, 32, 16, 10,
+ AES_SETUP, AES_ENC, NULL, NULL, AES_DONE, AES_KS,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
+};
+
+#endif
+
+/* Code partially borrowed from https://software.intel.com/content/www/us/en/develop/articles/intel-sha-extensions.html */
+#if defined(LTC_HAS_AES_NI)
+static LTC_INLINE int s_aesni_is_supported(void)
+{
+ static int initialized = 0, is_supported = 0;
+
+ if (initialized == 0) {
+ int a, b, c, d;
+
+ /* Look for CPUID.1.0.ECX[25]
+ * EAX = 1, ECX = 0
+ */
+ a = 1;
+ c = 0;
+
+ asm volatile ("cpuid"
+ :"=a"(a), "=b"(b), "=c"(c), "=d"(d)
+ :"a"(a), "c"(c)
+ );
+
+ is_supported = ((c >> 25) & 1);
+ initialized = 1;
+ }
+
+ return is_supported;
+}
+
+#ifndef ENCRYPT_ONLY
+int aesni_is_supported(void)
+{
+ return s_aesni_is_supported();
+}
+#endif
+#endif
+
+ /**
+ Initialize the AES (Rijndael) block cipher
+ @param key The symmetric key you wish to pass
+ @param keylen The key length in bytes
+ @param num_rounds The number of rounds desired (0 for default)
+ @param skey The key in as scheduled by this function.
+ @return CRYPT_OK if successful
+ */
+int AES_SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey)
+{
+#ifdef LTC_HAS_AES_NI
+ if (s_aesni_is_supported()) {
+ return aesni_setup(key, keylen, num_rounds, skey);
+ }
+#endif
+ /* Last resort, software AES */
+ return rijndael_setup(key, keylen, num_rounds, skey);
+}
+
+/**
+ Encrypts a block of text with AES
+ @param pt The input plaintext (16 bytes)
+ @param ct The output ciphertext (16 bytes)
+ @param skey The key as scheduled
+ @return CRYPT_OK if successful
+*/
+int AES_ENC(const unsigned char *pt, unsigned char *ct, const symmetric_key *skey)
+{
+#ifdef LTC_HAS_AES_NI
+ if (s_aesni_is_supported()) {
+ return aesni_ecb_encrypt(pt, ct, skey);
+ }
+#endif
+ return rijndael_ecb_encrypt(pt, ct, skey);
+}
+
+
+/**
+ Decrypts a block of text with AES
+ @param ct The input ciphertext (16 bytes)
+ @param pt The output plaintext (16 bytes)
+ @param skey The key as scheduled
+ @return CRYPT_OK if successful
+*/
+int AES_DEC(const unsigned char *ct, unsigned char *pt, const symmetric_key *skey)
+{
+#ifdef LTC_HAS_AES_NI
+ if (s_aesni_is_supported()) {
+ return aesni_ecb_decrypt(ct, pt, skey);
+ }
+#endif
+ return rijndael_ecb_decrypt(ct, pt, skey);
+}
+
+/**
+ Performs a self-test of the AES block cipher
+ @return CRYPT_OK if functional, CRYPT_NOP if self-test has been disabled
+*/
+int AES_TEST(void)
+{
+ #ifndef LTC_TEST
+ return CRYPT_NOP;
+ #else
+ int err;
+ static const struct {
+ int keylen;
+ unsigned char key[32], pt[16], ct[16];
+ } tests[] = {
+ { 16,
+ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
+ { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
+ 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
+ { 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30,
+ 0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a }
+ }, {
+ 24,
+ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
+ { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
+ 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
+ { 0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0,
+ 0x6e, 0xaf, 0x70, 0xa0, 0xec, 0x0d, 0x71, 0x91 }
+ }, {
+ 32,
+ { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
+ { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
+ 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
+ { 0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf,
+ 0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89 }
+ }
+ };
+
+ symmetric_key key;
+ unsigned char tmp[2][16];
+ int i, y;
+
+ for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
+ zeromem(&key, sizeof(key));
+ if ((err = aes_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {
+ return err;
+ }
+
+ aes_ecb_encrypt(tests[i].pt, tmp[0], &key);
+ aes_ecb_decrypt(tmp[0], tmp[1], &key);
+ if (compare_testvector(tmp[0], 16, tests[i].ct, 16, "AES Encrypt", i) ||
+ compare_testvector(tmp[1], 16, tests[i].pt, 16, "AES Decrypt", i)) {
+ return CRYPT_FAIL_TESTVECTOR;
+ }
+
+ /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
+ for (y = 0; y < 16; y++) tmp[0][y] = 0;
+ for (y = 0; y < 1000; y++) aes_ecb_encrypt(tmp[0], tmp[0], &key);
+ for (y = 0; y < 1000; y++) aes_ecb_decrypt(tmp[0], tmp[0], &key);
+ for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
+ }
+ return CRYPT_OK;
+ #endif
+}
+
+
+/** Terminate the context
+ @param skey The scheduled key
+*/
+void AES_DONE(symmetric_key *skey)
+{
+ LTC_UNUSED_PARAM(skey);
+}
+
+
+/**
+ Gets suitable key size
+ @param keysize [in/out] The length of the recommended key (in bytes). This function will store the suitable size back in this variable.
+ @return CRYPT_OK if the input key size is acceptable.
+*/
+int AES_KS(int *keysize)
+{
+ LTC_ARGCHK(keysize != NULL);
+
+ if (*keysize < 16) {
+ return CRYPT_INVALID_KEYSIZE;
+ }
+ if (*keysize < 24) {
+ *keysize = 16;
+ return CRYPT_OK;
+ }
+ if (*keysize < 32) {
+ *keysize = 24;
+ return CRYPT_OK;
+ }
+ *keysize = 32;
+ return CRYPT_OK;
+}
+
+#endif
+
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