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authorOndrej Mosnacek <omosnacek@gmail.com>2018-05-11 14:12:49 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2018-05-19 00:13:58 +0800
commitf606a88e58230c30f5d56a53eff8da6fdbf1e4ee (patch)
tree18c37d9d32d953978f5e88ed0ee8b414afa50b05 /crypto/aegis.h
parent15f47ce57572adaeddd763b7086e52fccc23ed7c (diff)
downloadlinux-f606a88e58230c30f5d56a53eff8da6fdbf1e4ee.tar.bz2
crypto: aegis - Add generic AEGIS AEAD implementations
This patch adds the generic implementation of the AEGIS family of AEAD algorithms (AEGIS-128, AEGIS-128L, and AEGIS-256). The original authors of AEGIS are Hongjun Wu and Bart Preneel. At the time of writing, AEGIS is one of the finalists in CAESAR, an open competition intended to select a portfolio of alternatives to the problematic AES-GCM: https://competitions.cr.yp.to/caesar-submissions.html https://competitions.cr.yp.to/round3/aegisv11.pdf Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/aegis.h')
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1 files changed, 80 insertions, 0 deletions
diff --git a/crypto/aegis.h b/crypto/aegis.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * AEGIS common definitions
+ *
+ * Copyright (c) 2018 Ondrej Mosnacek <omosnacek@gmail.com>
+ * Copyright (c) 2018 Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#ifndef _CRYPTO_AEGIS_H
+#define _CRYPTO_AEGIS_H
+
+#include <crypto/aes.h>
+#include <linux/types.h>
+
+#define AEGIS_BLOCK_SIZE 16
+
+union aegis_block {
+ __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
+ u32 words32[AEGIS_BLOCK_SIZE / sizeof(u32)];
+ u8 bytes[AEGIS_BLOCK_SIZE];
+};
+
+#define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
+#define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
+
+static const union aegis_block crypto_aegis_const[2] = {
+ { .words64 = {
+ cpu_to_le64(U64_C(0x0d08050302010100)),
+ cpu_to_le64(U64_C(0x6279e99059372215)),
+ } },
+ { .words64 = {
+ cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
+ cpu_to_le64(U64_C(0xdd28b57342311120)),
+ } },
+};
+
+static void crypto_aegis_block_xor(union aegis_block *dst,
+ const union aegis_block *src)
+{
+ dst->words64[0] ^= src->words64[0];
+ dst->words64[1] ^= src->words64[1];
+}
+
+static void crypto_aegis_block_and(union aegis_block *dst,
+ const union aegis_block *src)
+{
+ dst->words64[0] &= src->words64[0];
+ dst->words64[1] &= src->words64[1];
+}
+
+static void crypto_aegis_aesenc(union aegis_block *dst,
+ const union aegis_block *src,
+ const union aegis_block *key)
+{
+ u32 *d = dst->words32;
+ const u8 *s = src->bytes;
+ const u32 *k = key->words32;
+ const u32 *t0 = crypto_ft_tab[0];
+ const u32 *t1 = crypto_ft_tab[1];
+ const u32 *t2 = crypto_ft_tab[2];
+ const u32 *t3 = crypto_ft_tab[3];
+ u32 d0, d1, d2, d3;
+
+ d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]] ^ k[0];
+ d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]] ^ k[1];
+ d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]] ^ k[2];
+ d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]] ^ k[3];
+
+ d[0] = d0;
+ d[1] = d1;
+ d[2] = d2;
+ d[3] = d3;
+}
+
+#endif /* _CRYPTO_AEGIS_H */