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-rw-r--r--src/add_developedtweakey/ae-common.h127
-rw-r--r--src/add_developedtweakey/cipher.c175
-rw-r--r--src/add_developedtweakey/cipher.h23
-rw-r--r--src/add_developedtweakey/lilliput-ae-i.c195
-rw-r--r--src/add_developedtweakey/lilliput-ae-ii.c160
-rw-r--r--src/add_developedtweakey/lilliput-ae.h34
-rw-r--r--src/add_developedtweakey/parameters.h20
-rw-r--r--src/add_developedtweakey/tweakey.c127
-rw-r--r--src/add_developedtweakey/tweakey.h23
9 files changed, 884 insertions, 0 deletions
diff --git a/src/add_developedtweakey/ae-common.h b/src/add_developedtweakey/ae-common.h
new file mode 100644
index 0000000..561854e
--- /dev/null
+++ b/src/add_developedtweakey/ae-common.h
@@ -0,0 +1,127 @@
+#ifndef AE_COMMON_H
+#define AE_COMMON_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "cipher.h"
+#include "parameters.h"
+
+
+static inline uint8_t upper_nibble(uint8_t i)
+{
+ return i >> 4;
+}
+
+static inline uint8_t lower_nibble(uint8_t i)
+{
+ return i & 0x0f;
+}
+
+static inline void encrypt(const uint8_t K[KEY_BYTES],
+ const uint8_t T[TWEAK_BYTES],
+ const uint8_t M[BLOCK_BYTES],
+ uint8_t C[BLOCK_BYTES])
+{
+ lilliput_tbc_encrypt(K, T, M, C);
+}
+
+static inline void decrypt(const uint8_t K[KEY_BYTES],
+ const uint8_t T[TWEAK_BYTES],
+ const uint8_t C[BLOCK_BYTES],
+ uint8_t M[BLOCK_BYTES])
+{
+ lilliput_tbc_decrypt(K, T, C, M);
+}
+
+static inline void xor_into(uint8_t dest[BLOCK_BYTES], const uint8_t src[BLOCK_BYTES])
+{
+ for (size_t i=0; i<BLOCK_BYTES; i++)
+ dest[i] ^= src[i];
+}
+
+static inline void xor_arrays(size_t len, uint8_t out[len], const uint8_t a[len], const uint8_t b[len])
+{
+ for (size_t i=0; i<len; i++)
+ out[i] = a[i] ^ b[i];
+}
+
+static inline void pad10(size_t X_len, const uint8_t X[X_len], uint8_t padded[BLOCK_BYTES])
+{
+ /* pad10*(X) = X || 1 || 0^{n-|X|-1} */
+
+ /* Assume that len<BLOCK_BYTES. */
+
+ size_t pad_len = BLOCK_BYTES-X_len;
+
+ memcpy(padded+pad_len, X, X_len);
+
+ padded[pad_len-1] = 0x80;
+
+ if (pad_len > 1)
+ {
+ memset(padded, 0, pad_len-1);
+ }
+}
+
+static inline void fill_index_tweak(
+ uint8_t prefix,
+ uint64_t block_index,
+ uint8_t tweak[TWEAK_BYTES]
+)
+{
+ /* The t-bit tweak is filled as follows:
+ *
+ * - bits [ 1, t-4]: block index
+ * [ 1, 64]: actual 64-bit block index
+ * [ 65, t-4]: 0-padding
+ * - bits [t-3, t]: constant 4-bit prefix
+ */
+
+ for (size_t i=0; i<sizeof(block_index); i++)
+ {
+ tweak[i] = block_index >> 8*i & 0xff;
+ }
+
+ /* Assume padding bytes have already been memset to 0. */
+
+ tweak[TWEAK_BYTES-1] |= prefix << 4;
+}
+
+static void process_associated_data(
+ const uint8_t key[KEY_BYTES],
+ size_t A_len,
+ const uint8_t A[A_len],
+ uint8_t Auth[BLOCK_BYTES]
+)
+{
+ uint8_t Ek_Ai[BLOCK_BYTES];
+ uint8_t tweak[TWEAK_BYTES];
+
+ memset(tweak, 0, TWEAK_BYTES);
+ memset(Auth, 0, BLOCK_BYTES);
+
+ size_t l_a = A_len / BLOCK_BYTES;
+ size_t rest = A_len % BLOCK_BYTES;
+
+ for (size_t i=0; i<l_a; i++)
+ {
+ fill_index_tweak(0x2, i, tweak);
+ encrypt(key, tweak, &A[i*BLOCK_BYTES], Ek_Ai);
+ xor_into(Auth, Ek_Ai);
+ }
+
+ if (rest != 0)
+ {
+ uint8_t A_rest[BLOCK_BYTES];
+ pad10(rest, &A[l_a*BLOCK_BYTES], A_rest);
+ fill_index_tweak(0x6, l_a, tweak);
+ encrypt(key, tweak, A_rest, Ek_Ai);
+ xor_into(Auth, Ek_Ai);
+ }
+}
+
+
+
+#endif /* AE_COMMON_H */
diff --git a/src/add_developedtweakey/cipher.c b/src/add_developedtweakey/cipher.c
new file mode 100644
index 0000000..e5ccd15
--- /dev/null
+++ b/src/add_developedtweakey/cipher.c
@@ -0,0 +1,175 @@
+#include <stdint.h>
+#include <string.h>
+
+#include "cipher.h"
+#include "parameters.h"
+#include "tweakey.h"
+
+
+enum permutation
+{
+ PERMUTATION_ENCRYPTION = 0, /* PI(i) */
+ PERMUTATION_DECRYPTION = 1, /* PI^-1(i) */
+ PERMUTATION_NONE
+};
+
+typedef enum permutation permutation;
+
+static const uint8_t PERMUTATIONS[2][BLOCK_BYTES] = {
+ [PERMUTATION_ENCRYPTION] = { 13, 9, 14, 8, 10, 11, 12, 15, 4, 5, 3, 1, 2, 6, 0, 7 },
+ [PERMUTATION_DECRYPTION] = { 14, 11, 12, 10, 8, 9, 13, 15, 3, 1, 4, 5, 6, 0, 2, 7 }
+};
+
+static const uint8_t S[256] = {
+ 0x20, 0x00, 0xB2, 0x85, 0x3B, 0x35, 0xA6, 0xA4, 0x30, 0xE4, 0x6A, 0x2C, 0xFF, 0x59, 0xE2, 0x0E,
+ 0xF8, 0x1E, 0x7A, 0x80, 0x15, 0xBD, 0x3E, 0xB1, 0xE8, 0xF3, 0xA2, 0xC2, 0xDA, 0x51, 0x2A, 0x10,
+ 0x21, 0x01, 0x23, 0x78, 0x5C, 0x24, 0x27, 0xB5, 0x37, 0xC7, 0x2B, 0x1F, 0xAE, 0x0A, 0x77, 0x5F,
+ 0x6F, 0x09, 0x9D, 0x81, 0x04, 0x5A, 0x29, 0xDC, 0x39, 0x9C, 0x05, 0x57, 0x97, 0x74, 0x79, 0x17,
+ 0x44, 0xC6, 0xE6, 0xE9, 0xDD, 0x41, 0xF2, 0x8A, 0x54, 0xCA, 0x6E, 0x4A, 0xE1, 0xAD, 0xB6, 0x88,
+ 0x1C, 0x98, 0x7E, 0xCE, 0x63, 0x49, 0x3A, 0x5D, 0x0C, 0xEF, 0xF6, 0x34, 0x56, 0x25, 0x2E, 0xD6,
+ 0x67, 0x75, 0x55, 0x76, 0xB8, 0xD2, 0x61, 0xD9, 0x71, 0x8B, 0xCD, 0x0B, 0x72, 0x6C, 0x31, 0x4B,
+ 0x69, 0xFD, 0x7B, 0x6D, 0x60, 0x3C, 0x2F, 0x62, 0x3F, 0x22, 0x73, 0x13, 0xC9, 0x82, 0x7F, 0x53,
+ 0x32, 0x12, 0xA0, 0x7C, 0x02, 0x87, 0x84, 0x86, 0x93, 0x4E, 0x68, 0x46, 0x8D, 0xC3, 0xDB, 0xEC,
+ 0x9B, 0xB7, 0x89, 0x92, 0xA7, 0xBE, 0x3D, 0xD8, 0xEA, 0x50, 0x91, 0xF1, 0x33, 0x38, 0xE0, 0xA9,
+ 0xA3, 0x83, 0xA1, 0x1B, 0xCF, 0x06, 0x95, 0x07, 0x9E, 0xED, 0xB9, 0xF5, 0x4C, 0xC0, 0xF4, 0x2D,
+ 0x16, 0xFA, 0xB4, 0x03, 0x26, 0xB3, 0x90, 0x4F, 0xAB, 0x65, 0xFC, 0xFE, 0x14, 0xF7, 0xE3, 0x94,
+ 0xEE, 0xAC, 0x8C, 0x1A, 0xDE, 0xCB, 0x28, 0x40, 0x7D, 0xC8, 0xC4, 0x48, 0x6B, 0xDF, 0xA5, 0x52,
+ 0xE5, 0xFB, 0xD7, 0x64, 0xF9, 0xF0, 0xD3, 0x5E, 0x66, 0x96, 0x8F, 0x1D, 0x45, 0x36, 0xCC, 0xC5,
+ 0x4D, 0x9F, 0xBF, 0x0F, 0xD1, 0x08, 0xEB, 0x43, 0x42, 0x19, 0xE7, 0x99, 0xA8, 0x8E, 0x58, 0xC1,
+ 0x9A, 0xD4, 0x18, 0x47, 0xAA, 0xAF, 0xBC, 0x5B, 0xD5, 0x11, 0xD0, 0xB0, 0x70, 0xBB, 0x0D, 0xBA
+};
+
+
+static void _state_init(uint8_t X[BLOCK_BYTES], const uint8_t message[BLOCK_BYTES])
+{
+ memcpy(X, message, BLOCK_BYTES);
+}
+
+
+static void _compute_round_tweakeys(
+ const uint8_t key[KEY_BYTES],
+ const uint8_t tweak[TWEAK_BYTES],
+ uint8_t RTK[ROUNDS][ROUND_TWEAKEY_BYTES]
+)
+{
+ uint8_t TK[TWEAKEY_BYTES];
+ tweakey_state_init(TK, key, tweak);
+ tweakey_state_extract(TK, 0, RTK[0]);
+
+ for (uint8_t i=1; i<ROUNDS; i++)
+ {
+ tweakey_state_update(TK);
+ tweakey_state_extract(TK, i, RTK[i]);
+ }
+}
+
+
+static void _nonlinear_layer(uint8_t X[BLOCK_BYTES], const uint8_t RTK[ROUND_TWEAKEY_BYTES])
+{
+ uint8_t F[ROUND_TWEAKEY_BYTES];
+ for (size_t j=0; j<ROUND_TWEAKEY_BYTES; j++)
+ {
+ F[j] = X[j] ^ RTK[j];
+ }
+
+ for (size_t j=0; j<ROUND_TWEAKEY_BYTES; j++)
+ {
+ F[j] = S[F[j]];
+ }
+
+ for (size_t j=0; j<8; j++)
+ {
+ size_t dest_j = 15-j;
+ X[dest_j] ^= F[j];
+ }
+}
+
+static void _linear_layer(uint8_t X[BLOCK_BYTES])
+{
+ X[15] ^= X[1];
+ X[15] ^= X[2];
+ X[15] ^= X[3];
+ X[15] ^= X[4];
+ X[15] ^= X[5];
+ X[15] ^= X[6];
+ X[15] ^= X[7];
+
+ X[14] ^= X[7];
+ X[13] ^= X[7];
+ X[12] ^= X[7];
+ X[11] ^= X[7];
+ X[10] ^= X[7];
+ X[9] ^= X[7];
+}
+
+static void _permutation_layer(uint8_t X[BLOCK_BYTES], permutation p)
+{
+ if (p == PERMUTATION_NONE)
+ {
+ return;
+ }
+
+ uint8_t X_old[BLOCK_BYTES];
+ memcpy(X_old, X, BLOCK_BYTES);
+
+ const uint8_t *pi = PERMUTATIONS[p];
+
+ for (size_t j=0; j<BLOCK_BYTES; j++)
+ {
+ X[pi[j]] = X_old[j];
+ }
+}
+
+static void _one_round_egfn(uint8_t X[BLOCK_BYTES], const uint8_t RTK[ROUND_TWEAKEY_BYTES], permutation p)
+{
+ _nonlinear_layer(X, RTK);
+ _linear_layer(X);
+ _permutation_layer(X, p);
+}
+
+
+void lilliput_tbc_encrypt(
+ const uint8_t key[KEY_BYTES],
+ const uint8_t tweak[TWEAK_BYTES],
+ const uint8_t message[BLOCK_BYTES],
+ uint8_t ciphertext[BLOCK_BYTES]
+)
+{
+ uint8_t X[BLOCK_BYTES];
+ _state_init(X, message);
+
+ uint8_t RTK[ROUNDS][ROUND_TWEAKEY_BYTES];
+ _compute_round_tweakeys(key, tweak, RTK);
+
+ for (uint8_t i=0; i<ROUNDS-1; i++)
+ {
+ _one_round_egfn(X, RTK[i], PERMUTATION_ENCRYPTION);
+ }
+
+ _one_round_egfn(X, RTK[ROUNDS-1], PERMUTATION_NONE);
+
+ memcpy(ciphertext, X, BLOCK_BYTES);
+}
+
+void lilliput_tbc_decrypt(
+ const uint8_t key[KEY_BYTES],
+ const uint8_t tweak[TWEAK_BYTES],
+ const uint8_t ciphertext[BLOCK_BYTES],
+ uint8_t message[BLOCK_BYTES]
+)
+{
+ uint8_t X[BLOCK_BYTES];
+ _state_init(X, ciphertext);
+
+ uint8_t RTK[ROUNDS][ROUND_TWEAKEY_BYTES];
+ _compute_round_tweakeys(key, tweak, RTK);
+
+ for (uint8_t i=0; i<ROUNDS-1; i++)
+ {
+ _one_round_egfn(X, RTK[ROUNDS-1-i], PERMUTATION_DECRYPTION);
+ }
+
+ _one_round_egfn(X, RTK[0], PERMUTATION_NONE);
+
+ memcpy(message, X, BLOCK_BYTES);
+}
diff --git a/src/add_developedtweakey/cipher.h b/src/add_developedtweakey/cipher.h
new file mode 100644
index 0000000..06dfde5
--- /dev/null
+++ b/src/add_developedtweakey/cipher.h
@@ -0,0 +1,23 @@
+#ifndef CIPHER_H
+#define CIPHER_H
+
+#include <stdint.h>
+
+#include "parameters.h"
+
+
+void lilliput_tbc_encrypt(
+ const uint8_t key[KEY_BYTES],
+ const uint8_t tweak[TWEAK_BYTES],
+ const uint8_t message[BLOCK_BYTES],
+ uint8_t ciphertext[BLOCK_BYTES]
+);
+
+void lilliput_tbc_decrypt(
+ const uint8_t key[KEY_BYTES],
+ const uint8_t tweak[TWEAK_BYTES],
+ const uint8_t ciphertext[BLOCK_BYTES],
+ uint8_t message[BLOCK_BYTES]
+);
+
+#endif /* CIPHER_H */
diff --git a/src/add_developedtweakey/lilliput-ae-i.c b/src/add_developedtweakey/lilliput-ae-i.c
new file mode 100644
index 0000000..b1758c9
--- /dev/null
+++ b/src/add_developedtweakey/lilliput-ae-i.c
@@ -0,0 +1,195 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "ae-common.h"
+#include "cipher.h"
+#include "lilliput-ae.h"
+
+
+static const uint8_t _0n[BLOCK_BYTES] = {
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+
+static void _fill_msg_tweak(
+ uint8_t prefix,
+ const uint8_t N[NONCE_BYTES],
+ uint64_t block_nb,
+ uint8_t tweak[TWEAK_BYTES]
+)
+{
+ /* The 192-bit tweak is filled as follows:
+ *
+ * - bits 1- 68: block number
+ * 1- 64: actual 64-bit block number
+ * 64- 68: 0-padding
+ * - bits 67-188: nonce
+ * - bits 189-192: constant 4-bit prefix
+ */
+
+ for (size_t i=0; i<sizeof(block_nb); i++)
+ {
+ uint64_t mask = (uint64_t)0xff << 8*i;
+ uint8_t b = (mask & block_nb) >> 8*i;
+
+ tweak[i] = b;
+ }
+
+ tweak[sizeof(block_nb)] = lower_nibble(N[0]) << 4;
+
+ for (size_t i=1; i<NONCE_BYTES; i++)
+ {
+ tweak[sizeof(block_nb)+i] = lower_nibble(N[i]) << 4 ^ upper_nibble(N[i-1]);
+ }
+
+ tweak[TWEAK_BYTES-1] = prefix << 4 ^ upper_nibble(N[NONCE_BYTES-1]);
+}
+
+static void _encrypt_message(
+ const uint8_t key[KEY_BYTES],
+ size_t M_len,
+ const uint8_t M[M_len],
+ const uint8_t N[NONCE_BYTES],
+ uint8_t C[M_len+BLOCK_BYTES],
+ uint8_t Final[BLOCK_BYTES]
+)
+{
+ size_t l = M_len / BLOCK_BYTES;
+ size_t rest = M_len % BLOCK_BYTES;
+
+ uint8_t tweak[TWEAK_BYTES];
+ uint8_t checksum[BLOCK_BYTES];
+
+ memset(tweak, 0, TWEAK_BYTES);
+ memset(checksum, 0, BLOCK_BYTES);
+
+ for (size_t j=0; j<l; j++)
+ {
+ xor_into(checksum, &M[j*BLOCK_BYTES]);
+ _fill_msg_tweak(0x0, N, j, tweak);
+ encrypt(key, tweak, &M[j*BLOCK_BYTES], &C[j*BLOCK_BYTES]);
+ }
+
+ if (rest == 0)
+ {
+ _fill_msg_tweak(0x1, N, l-1, tweak);
+ encrypt(key, tweak, checksum, Final);
+ }
+ else
+ {
+ uint8_t M_rest[BLOCK_BYTES];
+ uint8_t Pad[BLOCK_BYTES];
+
+ pad10(rest, &M[l*BLOCK_BYTES], M_rest);
+ xor_into(checksum, M_rest);
+
+ _fill_msg_tweak(0x4, N, l, tweak);
+ encrypt(key, tweak, _0n, Pad);
+ xor_arrays(rest, &C[l*BLOCK_BYTES], &M[l*BLOCK_BYTES], Pad);
+
+ _fill_msg_tweak(0x5, N, l, tweak);
+ encrypt(key, tweak, checksum, Final);
+ }
+}
+
+static void _decrypt_message(
+ const uint8_t key[KEY_BYTES],
+ size_t C_len,
+ const uint8_t C[C_len],
+ const uint8_t N[NONCE_BYTES],
+ uint8_t M[C_len],
+ uint8_t Final[BLOCK_BYTES]
+)
+{
+ size_t l = C_len / BLOCK_BYTES;
+ size_t rest = C_len % BLOCK_BYTES;
+
+ uint8_t tweak[TWEAK_BYTES];
+ uint8_t checksum[BLOCK_BYTES];
+
+ memset(tweak, 0, TWEAK_BYTES);
+ memset(checksum, 0, BLOCK_BYTES);
+
+ for (size_t j=0; j<l; j++)
+ {
+ _fill_msg_tweak(0x0, N, j, tweak);
+ decrypt(key, tweak, &C[j*BLOCK_BYTES], &M[j*BLOCK_BYTES]);
+ xor_into(checksum, &M[j*BLOCK_BYTES]);
+ }
+
+ if (rest == 0)
+ {
+ _fill_msg_tweak(0x1, N, l-1, tweak);
+ encrypt(key, tweak, checksum, Final);
+ }
+ else
+ {
+ uint8_t M_rest[BLOCK_BYTES];
+ uint8_t Pad[BLOCK_BYTES];
+
+ _fill_msg_tweak(0x4, N, l, tweak);
+ encrypt(key, tweak, _0n, Pad);
+ xor_arrays(rest, &M[l*BLOCK_BYTES], &C[l*BLOCK_BYTES], Pad);
+
+ pad10(rest, &M[l*BLOCK_BYTES], M_rest);
+ xor_into(checksum, M_rest);
+
+ _fill_msg_tweak(0x5, N, l, tweak);
+ encrypt(key, tweak, checksum, Final);
+ }
+}
+
+static void _generate_tag(
+ const uint8_t Final[BLOCK_BYTES],
+ const uint8_t Auth[BLOCK_BYTES],
+ uint8_t tag[TAG_BYTES]
+)
+{
+ xor_arrays(TAG_BYTES, tag, Final, Auth);
+}
+
+
+void lilliput_ae_encrypt(
+ size_t message_len,
+ const uint8_t message[message_len],
+ size_t auth_data_len,
+ const uint8_t auth_data[auth_data_len],
+ const uint8_t key[KEY_BYTES],
+ const uint8_t nonce[NONCE_BYTES],
+ uint8_t ciphertext[message_len],
+ uint8_t tag[TAG_BYTES]
+)
+{
+ uint8_t auth[BLOCK_BYTES];
+ process_associated_data(key, auth_data_len, auth_data, auth);
+
+ uint8_t final[BLOCK_BYTES];
+ _encrypt_message(key, message_len, message, nonce, ciphertext, final);
+
+ _generate_tag(final, auth, tag);
+}
+
+bool lilliput_ae_decrypt(
+ size_t ciphertext_len,
+ const uint8_t ciphertext[ciphertext_len],
+ size_t auth_data_len,
+ const uint8_t auth_data[auth_data_len],
+ const uint8_t key[KEY_BYTES],
+ const uint8_t nonce[NONCE_BYTES],
+ const uint8_t tag[TAG_BYTES],
+ uint8_t message[ciphertext_len]
+)
+{
+ uint8_t auth[BLOCK_BYTES];
+ process_associated_data(key, auth_data_len, auth_data, auth);
+
+ uint8_t final[BLOCK_BYTES];
+ _decrypt_message(key, ciphertext_len, ciphertext, nonce, message, final);
+
+ uint8_t effective_tag[TAG_BYTES];
+ _generate_tag(final, auth, effective_tag);
+
+ return memcmp(tag, effective_tag, TAG_BYTES) == 0;
+}
diff --git a/src/add_developedtweakey/lilliput-ae-ii.c b/src/add_developedtweakey/lilliput-ae-ii.c
new file mode 100644
index 0000000..26885e5
--- /dev/null
+++ b/src/add_developedtweakey/lilliput-ae-ii.c
@@ -0,0 +1,160 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "ae-common.h"
+#include "cipher.h"
+#include "lilliput-ae.h"
+
+
+static void _init_msg_tweak(const uint8_t tag[TAG_BYTES], uint8_t tweak[TWEAK_BYTES])
+{
+ /* The t-bit tweak is filled as follows:
+ *
+ * - bits [ 1, t-1]: tag + block index
+ * [ 1, 64]: tag[ 1.. 64] XOR block index
+ * [ 65, t-1]: tag[65..t-1]
+ * - bit t: 1
+ */
+
+ memcpy(tweak+sizeof(uint64_t), tag+sizeof(uint64_t), TAG_BYTES-sizeof(uint64_t));
+ tweak[TWEAK_BYTES-1] |= 0x80;
+}
+
+static void _fill_msg_tweak(const uint8_t tag[TAG_BYTES], uint64_t block_index, uint8_t tweak[TWEAK_BYTES])
+{
+ /* Assume bits 65 to t-1 are set. */
+ for (size_t i=0; i<sizeof(block_index); i++)
+ {
+ uint8_t index_i = block_index >> i*8 & 0xff;
+ tweak[i] = tag[i] ^ index_i;
+ }
+}
+
+static void _fill_tag_tweak(const uint8_t N[NONCE_BYTES], uint8_t tweak[TWEAK_BYTES])
+{
+ /* The t-bit tweak is filled as follows:
+ *
+ * - bits [ 1, t-7]: N
+ * - bits [t-7, t]: 0001||0^4
+ */
+
+ memcpy(tweak, N, TWEAK_BYTES-1);
+ tweak[TWEAK_BYTES-1] = 0x10;
+}
+
+static void _generate_tag(
+ const uint8_t key[KEY_BYTES],
+ size_t M_len,
+ const uint8_t M[M_len],
+ const uint8_t N[NONCE_BYTES],
+ const uint8_t Auth[BLOCK_BYTES],
+ uint8_t tag[TAG_BYTES]
+)
+{
+ uint8_t Ek_Mj[BLOCK_BYTES];
+ uint8_t tag_tmp[TAG_BYTES];
+ uint8_t tweak[TWEAK_BYTES];
+
+ memset(tweak, 0, TWEAK_BYTES);
+ memcpy(tag_tmp, Auth, TAG_BYTES);
+
+ size_t l = M_len / BLOCK_BYTES;
+ size_t rest = M_len % BLOCK_BYTES;
+
+ for (size_t j=0; j<l; j++)
+ {
+ fill_index_tweak(0x0, j, tweak);
+ encrypt(key, tweak, &M[j*BLOCK_BYTES], Ek_Mj);
+ xor_into(tag_tmp, Ek_Mj);
+ }
+
+ if (rest != 0)
+ {
+ uint8_t M_rest[BLOCK_BYTES];
+ pad10(rest, &M[l*BLOCK_BYTES], M_rest);
+ fill_index_tweak(0x4, l, tweak);
+ encrypt(key, tweak, M_rest, Ek_Mj);
+ xor_into(tag_tmp, Ek_Mj);
+ }
+
+ _fill_tag_tweak(N, tweak);
+ encrypt(key, tweak, tag_tmp, tag);
+}
+
+static void _encrypt_message(
+ const uint8_t key[KEY_BYTES],
+ size_t M_len,
+ const uint8_t M[M_len],
+ const uint8_t N[NONCE_BYTES],
+ const uint8_t tag[TAG_BYTES],
+ uint8_t C[M_len]
+)
+{
+ uint8_t Ek_N[BLOCK_BYTES];
+
+ uint8_t tweak[TWEAK_BYTES];
+ _init_msg_tweak(tag, tweak);
+
+ uint8_t padded_N[BLOCK_BYTES];
+ memcpy(padded_N, N, NONCE_BYTES);
+ padded_N[BLOCK_BYTES-1] = 0;
+
+ size_t l = M_len / BLOCK_BYTES;
+ size_t rest = M_len % BLOCK_BYTES;
+
+ for (size_t j=0; j<l; j++)
+ {
+ _fill_msg_tweak(tag, j, tweak);
+ encrypt(key, tweak, padded_N, Ek_N);
+ xor_arrays(BLOCK_BYTES, &C[j*BLOCK_BYTES], &M[j*BLOCK_BYTES], Ek_N);
+ }
+
+ if (rest != 0)
+ {
+ _fill_msg_tweak(tag, l, tweak);
+ encrypt(key, tweak, padded_N, Ek_N);
+ xor_arrays(rest, &C[l*BLOCK_BYTES], &M[l*BLOCK_BYTES], Ek_N);
+ }
+}
+
+void lilliput_ae_encrypt(
+ size_t message_len,
+ const uint8_t message[message_len],
+ size_t auth_data_len,
+ const uint8_t auth_data[auth_data_len],
+ const uint8_t key[KEY_BYTES],
+ const uint8_t nonce[NONCE_BYTES],
+ uint8_t ciphertext[message_len],
+ uint8_t tag[TAG_BYTES]
+)
+{
+ uint8_t auth[BLOCK_BYTES];
+ process_associated_data(key, auth_data_len, auth_data, auth);
+
+ _generate_tag(key, message_len, message, nonce, auth, tag);
+
+ _encrypt_message(key, message_len, message, nonce, tag, ciphertext);
+}
+
+bool lilliput_ae_decrypt(
+ size_t ciphertext_len,
+ const uint8_t ciphertext[ciphertext_len],
+ size_t auth_data_len,
+ const uint8_t auth_data[auth_data_len],
+ const uint8_t key[KEY_BYTES],
+ const uint8_t nonce[NONCE_BYTES],
+ const uint8_t tag[TAG_BYTES],
+ uint8_t message[ciphertext_len]
+)
+{
+ _encrypt_message(key, ciphertext_len, ciphertext, nonce, tag, message);
+
+ uint8_t auth[BLOCK_BYTES];
+ process_associated_data(key, auth_data_len, auth_data, auth);
+
+ uint8_t effective_tag[TAG_BYTES];
+ _generate_tag(key, ciphertext_len, message, nonce, auth, effective_tag);
+
+ return memcmp(tag, effective_tag, TAG_BYTES) == 0;
+}
diff --git a/src/add_developedtweakey/lilliput-ae.h b/src/add_developedtweakey/lilliput-ae.h
new file mode 100644
index 0000000..e2d5051
--- /dev/null
+++ b/src/add_developedtweakey/lilliput-ae.h
@@ -0,0 +1,34 @@
+#ifndef LILLIPUT_AE_H
+#define LILLIPUT_AE_H
+
+#include <stddef.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "parameters.h"
+
+
+void lilliput_ae_encrypt(
+ size_t message_len,
+ const uint8_t message[message_len],
+ size_t auth_data_len,
+ const uint8_t auth_data[auth_data_len],
+ const uint8_t key[KEY_BYTES],
+ const uint8_t nonce[NONCE_BYTES],
+ uint8_t ciphertext[message_len],
+ uint8_t tag[TAG_BYTES]
+);
+
+bool lilliput_ae_decrypt(
+ size_t ciphertext_len,
+ const uint8_t ciphertext[ciphertext_len],
+ size_t auth_data_len,
+ const uint8_t auth_data[auth_data_len],
+ const uint8_t key[KEY_BYTES],
+ const uint8_t nonce[NONCE_BYTES],
+ const uint8_t tag[TAG_BYTES],
+ uint8_t message[ciphertext_len]
+);
+
+
+#endif /* LILLIPUT_AE_H */
diff --git a/src/add_developedtweakey/parameters.h b/src/add_developedtweakey/parameters.h
new file mode 100644
index 0000000..681a152
--- /dev/null
+++ b/src/add_developedtweakey/parameters.h
@@ -0,0 +1,20 @@
+#ifndef PARAMETERS_H
+#define PARAMETERS_H
+
+#include "_parameters.h"
+
+#define TWEAKEY_LENGTH_BITS (TWEAK_LENGTH_BITS+KEY_LENGTH_BITS)
+#define ROUND_TWEAKEY_LENGTH_BITS 64
+#define BLOCK_LENGTH_BITS 128
+#define NONCE_LENGTH_BITS 120
+#define TAG_LENGTH_BITS 128
+
+#define TWEAK_BYTES (TWEAK_LENGTH_BITS/8)
+#define KEY_BYTES (KEY_LENGTH_BITS/8)
+#define TWEAKEY_BYTES (TWEAKEY_LENGTH_BITS/8)
+#define ROUND_TWEAKEY_BYTES (ROUND_TWEAKEY_LENGTH_BITS/8)
+#define BLOCK_BYTES (BLOCK_LENGTH_BITS/8)
+#define NONCE_BYTES (NONCE_LENGTH_BITS/8)
+#define TAG_BYTES (TAG_LENGTH_BITS/8)
+
+#endif /* PARAMETERS_H */
diff --git a/src/add_developedtweakey/tweakey.c b/src/add_developedtweakey/tweakey.c
new file mode 100644
index 0000000..54b3036
--- /dev/null
+++ b/src/add_developedtweakey/tweakey.c
@@ -0,0 +1,127 @@
+#include <stdint.h>
+#include <string.h>
+
+#include "parameters.h"
+#include "tweakey.h"
+
+
+#define LANE_BITS 64
+#define LANE_BYTES (LANE_BITS/8)
+#define LANES_NB (TWEAKEY_BYTES/LANE_BYTES)
+
+
+void tweakey_state_init(
+ uint8_t TK[TWEAKEY_BYTES],
+ const uint8_t key[KEY_BYTES],
+ const uint8_t tweak[TWEAK_BYTES]
+)
+{
+ memcpy(TK, tweak, TWEAK_BYTES);
+ memcpy(TK+TWEAK_BYTES, key, KEY_BYTES);
+}
+
+
+void tweakey_state_extract(
+ const uint8_t TK[TWEAKEY_BYTES],
+ uint8_t round_constant,
+ uint8_t round_tweakey[ROUND_TWEAKEY_BYTES]
+)
+{
+ memset(round_tweakey, 0, ROUND_TWEAKEY_BYTES);
+
+ for (size_t j=0; j<LANES_NB; j++)
+ {
+ const uint8_t *TKj = TK + j*LANE_BYTES;
+
+ for (size_t k=0; k<LANE_BYTES; k++)
+ {
+ round_tweakey[k] ^= TKj[k];
+ }
+ }
+
+ round_tweakey[0] ^= round_constant;
+}
+
+
+static void _multiply_M(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
+{
+ Y[7] = X[6];
+ Y[6] = X[5];
+ Y[5] = X[5]<<3 ^ X[4];
+ Y[4] = X[4]>>3 ^ X[3];
+ Y[3] = X[2];
+ Y[2] = X[6]<<2 ^ X[1];
+ Y[1] = X[0];
+ Y[0] = X[7];
+}
+
+static void _multiply_M2(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
+{
+ uint8_t M_X[LANE_BYTES];
+ _multiply_M(X, M_X);
+ _multiply_M(M_X, Y);
+}
+
+static void _multiply_M3(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
+{
+ uint8_t M_X[LANE_BYTES];
+ uint8_t M2_X[LANE_BYTES];
+ _multiply_M(X, M_X);
+ _multiply_M(M_X, M2_X);
+ _multiply_M(M2_X, Y);
+}
+
+static void _multiply_MR(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
+{
+ Y[0] = X[1];
+ Y[1] = X[2];
+ Y[2] = X[3] ^ X[4]>>3;
+ Y[3] = X[4];
+ Y[4] = X[5] ^ X[6]<<3;
+ Y[5] = X[3]<<2 ^ X[6];
+ Y[6] = X[7];
+ Y[7] = X[0];
+}
+
+static void _multiply_MR2(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
+{
+ uint8_t MR_X[LANE_BYTES];
+ _multiply_MR(X, MR_X);
+ _multiply_MR(MR_X, Y);
+}
+
+static void _multiply_MR3(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES])
+{
+ uint8_t MR_X[LANE_BYTES];
+ uint8_t MR2_X[LANE_BYTES];
+ _multiply_MR(X, MR_X);
+ _multiply_MR(MR_X, MR2_X);
+ _multiply_MR(MR2_X, Y);
+}
+
+typedef void (*matrix_multiplication)(const uint8_t X[LANE_BYTES], uint8_t Y[LANE_BYTES]);
+
+static const matrix_multiplication ALPHAS[6] = {
+ _multiply_M,
+ _multiply_M2,
+ _multiply_M3,
+ _multiply_MR,
+ _multiply_MR2,
+ _multiply_MR3
+};
+
+
+void tweakey_state_update(uint8_t TK[TWEAKEY_BYTES])
+{
+ /* Skip lane 0, as it is multiplied by the identity matrix. */
+
+ for (size_t j=1; j<LANES_NB; j++)
+ {
+ uint8_t *TKj = TK + j*LANE_BYTES;
+
+ uint8_t TKj_old[LANE_BYTES];
+ memcpy(TKj_old, TKj, LANE_BYTES);
+
+ ALPHAS[j-1](TKj_old, TKj);
+ }
+}
diff --git a/src/add_developedtweakey/tweakey.h b/src/add_developedtweakey/tweakey.h
new file mode 100644
index 0000000..5470bc8
--- /dev/null
+++ b/src/add_developedtweakey/tweakey.h
@@ -0,0 +1,23 @@
+#ifndef TWEAKEY_H
+#define TWEAKEY_H
+
+#include <stdint.h>
+
+#include "parameters.h"
+
+
+void tweakey_state_init(
+ uint8_t TK[TWEAKEY_BYTES],
+ const uint8_t key[KEY_BYTES],
+ const uint8_t tweak[TWEAK_BYTES]
+);
+
+void tweakey_state_extract(
+ const uint8_t TK[TWEAKEY_BYTES],
+ uint8_t round_constant,
+ uint8_t round_tweakey[ROUND_TWEAKEY_BYTES] /* output */
+);
+
+void tweakey_state_update(uint8_t TK[TWEAKEY_BYTES]);
+
+#endif /* TWEAKEY_H */
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 19:55:45 +0000