aesni: Add a GCM AEAD based on the AES-NI key schedule
This commit is contained in:
Martin Willi
parent
4284660677
commit
313811b72d
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@ -3,6 +3,7 @@ AM_CPPFLAGS = \
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AM_CFLAGS = \
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-maes \
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-mpclmul \
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-mssse3 \
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$(PLUGIN_CFLAGS)
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@ -17,6 +18,7 @@ libstrongswan_aesni_la_SOURCES = \
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aesni_cbc.h aesni_cbc.c \
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aesni_ctr.h aesni_ctr.c \
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aesni_ccm.h aesni_ccm.c \
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aesni_gcm.h aesni_gcm.c \
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aesni_xcbc.h aesni_xcbc.c \
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aesni_cmac.h aesni_cmac.c \
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aesni_plugin.h aesni_plugin.c
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@ -0,0 +1,563 @@
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/*
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* Copyright (C) 2015 Martin Willi
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* Copyright (C) 2015 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "aesni_gcm.h"
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#include "aesni_key.h"
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#include <crypto/iv/iv_gen_seq.h>
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#include <tmmintrin.h>
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#define NONCE_SIZE 12
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#define IV_SIZE 8
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#define SALT_SIZE (NONCE_SIZE - IV_SIZE)
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typedef struct private_aesni_gcm_t private_aesni_gcm_t;
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/**
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* GCM en/decryption method type
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*/
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typedef void (*aesni_gcm_fn_t)(private_aesni_gcm_t*, size_t, u_char*, u_char*,
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u_char*, size_t, u_char*, u_char*);
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/**
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* Private data of an aesni_gcm_t object.
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*/
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struct private_aesni_gcm_t {
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/**
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* Public aesni_gcm_t interface.
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*/
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aesni_gcm_t public;
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/**
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* Encryption key schedule
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*/
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aesni_key_t *key;
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/**
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* IV generator.
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*/
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iv_gen_t *iv_gen;
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/**
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* Length of the integrity check value
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*/
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size_t icv_size;
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/**
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* Length of the key in bytes
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*/
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size_t key_size;
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/**
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* GCM encryption function
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*/
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aesni_gcm_fn_t encrypt;
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/**
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* GCM decryption function
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*/
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aesni_gcm_fn_t decrypt;
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/**
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* salt to add to nonce
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*/
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u_char salt[SALT_SIZE];
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/**
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* GHASH subkey H, big-endian
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*/
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__m128i h;
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};
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/**
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* Byte-swap a 128-bit integer
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*/
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static inline __m128i swap128(__m128i x)
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{
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return _mm_shuffle_epi8(x,
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_mm_set_epi8(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15));
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}
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/**
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* Multiply two blocks in GF128
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*/
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static inline __m128i mult_block(__m128i h, __m128i y)
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{
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__m128i t1, t2, t3, t4, t5, t6;
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y = swap128(y);
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t1 = _mm_clmulepi64_si128(h, y, 0x00);
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t2 = _mm_clmulepi64_si128(h, y, 0x01);
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t3 = _mm_clmulepi64_si128(h, y, 0x10);
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t4 = _mm_clmulepi64_si128(h, y, 0x11);
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t2 = _mm_xor_si128(t2, t3);
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t3 = _mm_slli_si128(t2, 8);
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t2 = _mm_srli_si128(t2, 8);
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t1 = _mm_xor_si128(t1, t3);
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t4 = _mm_xor_si128(t4, t2);
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t5 = _mm_srli_epi32(t1, 31);
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t1 = _mm_slli_epi32(t1, 1);
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t6 = _mm_srli_epi32(t4, 31);
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t4 = _mm_slli_epi32(t4, 1);
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t3 = _mm_srli_si128(t5, 12);
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t6 = _mm_slli_si128(t6, 4);
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t5 = _mm_slli_si128(t5, 4);
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t1 = _mm_or_si128(t1, t5);
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t4 = _mm_or_si128(t4, t6);
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t4 = _mm_or_si128(t4, t3);
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t5 = _mm_slli_epi32(t1, 31);
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t6 = _mm_slli_epi32(t1, 30);
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t3 = _mm_slli_epi32(t1, 25);
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t5 = _mm_xor_si128(t5, t6);
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t5 = _mm_xor_si128(t5, t3);
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t6 = _mm_srli_si128(t5, 4);
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t4 = _mm_xor_si128(t4, t6);
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t5 = _mm_slli_si128(t5, 12);
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t1 = _mm_xor_si128(t1, t5);
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t4 = _mm_xor_si128(t4, t1);
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t5 = _mm_srli_epi32(t1, 1);
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t2 = _mm_srli_epi32(t1, 2);
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t3 = _mm_srli_epi32(t1, 7);
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t4 = _mm_xor_si128(t4, t2);
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t4 = _mm_xor_si128(t4, t3);
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t4 = _mm_xor_si128(t4, t5);
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return swap128(t4);
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}
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/**
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* GHASH on a single block
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*/
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static __m128i ghash(__m128i h, __m128i y, __m128i x)
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{
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return mult_block(h, _mm_xor_si128(y, x));
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}
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/**
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* Start constructing the ICV for the associated data
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*/
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static __m128i icv_header(private_aesni_gcm_t *this, void *assoc, size_t alen)
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{
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u_int blocks, rem, i;
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__m128i y, last, *ab;
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y = _mm_setzero_si128();
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ab = assoc;
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blocks = alen / AES_BLOCK_SIZE;
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rem = alen % AES_BLOCK_SIZE;
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for (i = 0; i < blocks; i++)
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{
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y = ghash(this->h, y, _mm_loadu_si128(ab + i));
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}
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if (rem)
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{
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last = _mm_setzero_si128();
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memcpy(&last, ab + blocks, rem);
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y = ghash(this->h, y, last);
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}
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return y;
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}
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/**
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* Complete the ICV by hashing a assoc/data length block
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*/
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static __m128i icv_tailer(private_aesni_gcm_t *this, __m128i y,
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size_t alen, size_t dlen)
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{
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__m128i b;
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htoun64(&b, alen * 8);
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htoun64((u_char*)&b + sizeof(u_int64_t), dlen * 8);
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return ghash(this->h, y, b);
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}
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/**
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* En-/Decrypt the ICV, trim and store it
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*/
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static void icv_crypt(private_aesni_gcm_t *this, __m128i y, __m128i j,
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u_char *icv)
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{
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__m128i t, b;
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u_int round;
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t = _mm_xor_si128(j, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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t = _mm_aesenc_si128(t, this->key->schedule[round]);
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}
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t = _mm_aesenclast_si128(t, this->key->schedule[this->key->rounds]);
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t = _mm_xor_si128(y, t);
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_mm_storeu_si128(&b, t);
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memcpy(icv, &b, this->icv_size);
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}
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/**
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* Do big-endian increment on x
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*/
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static inline __m128i increment_be(__m128i x)
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{
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x = swap128(x);
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x = _mm_add_epi64(x, _mm_set_epi32(0, 0, 0, 1));
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x = swap128(x);
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return x;
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}
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/**
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* Generate the block J0
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*/
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static inline __m128i create_j(private_aesni_gcm_t *this, u_char *iv)
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{
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u_char j[AES_BLOCK_SIZE];
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memcpy(j, this->salt, SALT_SIZE);
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memcpy(j + SALT_SIZE, iv, IV_SIZE);
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htoun32(j + SALT_SIZE + IV_SIZE, 1);
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return _mm_loadu_si128((__m128i*)j);
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}
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/**
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* Encrypt a remaining incomplete block, return updated Y
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*/
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static __m128i encrypt_gcm_rem(private_aesni_gcm_t *this, u_int rem,
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void *in, void *out, __m128i cb, __m128i y)
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{
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__m128i t, b;
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u_int round;
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memset(&b, 0, sizeof(b));
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memcpy(&b, in, rem);
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t = _mm_xor_si128(cb, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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t = _mm_aesenc_si128(t, this->key->schedule[round]);
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}
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t = _mm_aesenclast_si128(t, this->key->schedule[this->key->rounds]);
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b = _mm_xor_si128(t, b);
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memcpy(out, &b, rem);
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memset((u_char*)&b + rem, 0, AES_BLOCK_SIZE - rem);
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return ghash(this->h, y, b);
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}
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/**
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* Decrypt a remaining incomplete block, return updated Y
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*/
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static __m128i decrypt_gcm_rem(private_aesni_gcm_t *this, u_int rem,
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void *in, void *out, __m128i cb, __m128i y)
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{
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__m128i t, b;
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u_int round;
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memset(&b, 0, sizeof(b));
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memcpy(&b, in, rem);
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y = ghash(this->h, y, b);
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t = _mm_xor_si128(cb, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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t = _mm_aesenc_si128(t, this->key->schedule[round]);
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}
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t = _mm_aesenclast_si128(t, this->key->schedule[this->key->rounds]);
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b = _mm_xor_si128(t, b);
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memcpy(out, &b, rem);
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return y;
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}
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/**
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* Generic GCM encryption/ICV generation
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*/
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static void encrypt_gcm(private_aesni_gcm_t *this,
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size_t len, u_char *in, u_char *out, u_char *iv,
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size_t alen, u_char *assoc, u_char *icv)
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{
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__m128i d, t, y, j, cb, *bi, *bo;
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u_int round, blocks, rem, i;
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j = create_j(this, iv);
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y = icv_header(this, assoc, alen);
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blocks = len / AES_BLOCK_SIZE;
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rem = len % AES_BLOCK_SIZE;
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bi = (__m128i*)in;
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bo = (__m128i*)out;
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cb = increment_be(j);
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for (i = 0; i < blocks; i++)
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{
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d = _mm_loadu_si128(bi + i);
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t = _mm_xor_si128(cb, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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t = _mm_aesenc_si128(t, this->key->schedule[round]);
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}
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t = _mm_aesenclast_si128(t, this->key->schedule[this->key->rounds]);
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t = _mm_xor_si128(t, d);
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_mm_storeu_si128(bo + i, t);
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y = ghash(this->h, y, t);
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cb = increment_be(cb);
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}
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if (rem)
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{
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y = encrypt_gcm_rem(this, rem, bi + blocks, bo + blocks, cb, y);
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}
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y = icv_tailer(this, y, alen, len);
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icv_crypt(this, y, j, icv);
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}
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/**
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* Generic GCM decryption/ICV generation
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*/
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static void decrypt_gcm(private_aesni_gcm_t *this,
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size_t len, u_char *in, u_char *out, u_char *iv,
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size_t alen, u_char *assoc, u_char *icv)
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{
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__m128i d, t, y, j, cb, *bi, *bo;
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u_int round, blocks, rem, i;
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j = create_j(this, iv);
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y = icv_header(this, assoc, alen);
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blocks = len / AES_BLOCK_SIZE;
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rem = len % AES_BLOCK_SIZE;
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bi = (__m128i*)in;
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bo = (__m128i*)out;
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cb = increment_be(j);
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for (i = 0; i < blocks; i++)
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{
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d = _mm_loadu_si128(bi + i);
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y = ghash(this->h, y, d);
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t = _mm_xor_si128(cb, this->key->schedule[0]);
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for (round = 1; round < this->key->rounds; round++)
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{
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t = _mm_aesenc_si128(t, this->key->schedule[round]);
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}
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t = _mm_aesenclast_si128(t, this->key->schedule[this->key->rounds]);
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t = _mm_xor_si128(t, d);
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_mm_storeu_si128(bo + i, t);
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cb = increment_be(cb);
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}
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if (rem)
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{
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y = decrypt_gcm_rem(this, rem, bi + blocks, bo + blocks, cb, y);
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}
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y = icv_tailer(this, y, alen, len);
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icv_crypt(this, y, j, icv);
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}
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METHOD(aead_t, encrypt, bool,
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private_aesni_gcm_t *this, chunk_t plain, chunk_t assoc, chunk_t iv,
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chunk_t *encr)
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{
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u_char *out;
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if (!this->key || iv.len != IV_SIZE)
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{
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return FALSE;
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}
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out = plain.ptr;
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if (encr)
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{
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*encr = chunk_alloc(plain.len + this->icv_size);
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out = encr->ptr;
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}
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this->encrypt(this, plain.len, plain.ptr, out, iv.ptr,
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assoc.len, assoc.ptr, out + plain.len);
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return TRUE;
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}
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METHOD(aead_t, decrypt, bool,
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private_aesni_gcm_t *this, chunk_t encr, chunk_t assoc, chunk_t iv,
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chunk_t *plain)
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{
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u_char *out, icv[this->icv_size];
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if (!this->key || iv.len != IV_SIZE || encr.len < this->icv_size)
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{
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return FALSE;
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}
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encr.len -= this->icv_size;
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out = encr.ptr;
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if (plain)
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{
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*plain = chunk_alloc(encr.len);
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out = plain->ptr;
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}
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this->decrypt(this, encr.len, encr.ptr, out, iv.ptr,
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assoc.len, assoc.ptr, icv);
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return memeq_const(icv, encr.ptr + encr.len, this->icv_size);
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}
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METHOD(aead_t, get_block_size, size_t,
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private_aesni_gcm_t *this)
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{
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return 1;
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}
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METHOD(aead_t, get_icv_size, size_t,
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private_aesni_gcm_t *this)
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{
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return this->icv_size;
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}
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METHOD(aead_t, get_iv_size, size_t,
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private_aesni_gcm_t *this)
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{
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return IV_SIZE;
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}
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METHOD(aead_t, get_iv_gen, iv_gen_t*,
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private_aesni_gcm_t *this)
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{
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return this->iv_gen;
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}
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METHOD(aead_t, get_key_size, size_t,
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private_aesni_gcm_t *this)
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{
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return this->key_size + SALT_SIZE;
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}
|
||||
|
||||
METHOD(aead_t, set_key, bool,
|
||||
private_aesni_gcm_t *this, chunk_t key)
|
||||
{
|
||||
u_int round;
|
||||
__m128i h;
|
||||
|
||||
if (key.len != this->key_size + SALT_SIZE)
|
||||
{
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
memcpy(this->salt, key.ptr + key.len - SALT_SIZE, SALT_SIZE);
|
||||
key.len -= SALT_SIZE;
|
||||
|
||||
DESTROY_IF(this->key);
|
||||
this->key = aesni_key_create(TRUE, key);
|
||||
|
||||
h = _mm_xor_si128(_mm_setzero_si128(), this->key->schedule[0]);
|
||||
for (round = 1; round < this->key->rounds; round++)
|
||||
{
|
||||
h = _mm_aesenc_si128(h, this->key->schedule[round]);
|
||||
}
|
||||
h = _mm_aesenclast_si128(h, this->key->schedule[this->key->rounds]);
|
||||
|
||||
this->h = swap128(h);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
METHOD(aead_t, destroy, void,
|
||||
private_aesni_gcm_t *this)
|
||||
{
|
||||
DESTROY_IF(this->key);
|
||||
memwipe(&this->h, sizeof(this->h));
|
||||
this->iv_gen->destroy(this->iv_gen);
|
||||
free(this);
|
||||
}
|
||||
|
||||
/**
|
||||
* See header
|
||||
*/
|
||||
aesni_gcm_t *aesni_gcm_create(encryption_algorithm_t algo,
|
||||
size_t key_size, size_t salt_size)
|
||||
{
|
||||
private_aesni_gcm_t *this;
|
||||
size_t icv_size;
|
||||
|
||||
switch (key_size)
|
||||
{
|
||||
case 0:
|
||||
key_size = 16;
|
||||
break;
|
||||
case 16:
|
||||
case 24:
|
||||
case 32:
|
||||
break;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
if (salt_size && salt_size != SALT_SIZE)
|
||||
{
|
||||
/* currently not supported */
|
||||
return NULL;
|
||||
}
|
||||
switch (algo)
|
||||
{
|
||||
case ENCR_AES_GCM_ICV8:
|
||||
algo = ENCR_AES_CBC;
|
||||
icv_size = 8;
|
||||
break;
|
||||
case ENCR_AES_GCM_ICV12:
|
||||
algo = ENCR_AES_CBC;
|
||||
icv_size = 12;
|
||||
break;
|
||||
case ENCR_AES_GCM_ICV16:
|
||||
algo = ENCR_AES_CBC;
|
||||
icv_size = 16;
|
||||
break;
|
||||
default:
|
||||
return NULL;
|
||||
}
|
||||
|
||||
INIT(this,
|
||||
.public = {
|
||||
.aead = {
|
||||
.encrypt = _encrypt,
|
||||
.decrypt = _decrypt,
|
||||
.get_block_size = _get_block_size,
|
||||
.get_icv_size = _get_icv_size,
|
||||
.get_iv_size = _get_iv_size,
|
||||
.get_iv_gen = _get_iv_gen,
|
||||
.get_key_size = _get_key_size,
|
||||
.set_key = _set_key,
|
||||
.destroy = _destroy,
|
||||
},
|
||||
},
|
||||
.key_size = key_size,
|
||||
.iv_gen = iv_gen_seq_create(),
|
||||
.icv_size = icv_size,
|
||||
.encrypt = encrypt_gcm,
|
||||
.decrypt = decrypt_gcm,
|
||||
);
|
||||
|
||||
return &this->public;
|
||||
}
|
||||
|
|
@ -0,0 +1,50 @@
|
|||
/*
|
||||
* Copyright (C) 2015 Martin Willi
|
||||
* Copyright (C) 2015 revosec AG
|
||||
*
|
||||
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
||||
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||||
* for more details.
|
||||
*/
|
||||
|
||||
/**
|
||||
* @defgroup aesni_gcm aesni_gcm
|
||||
* @{ @ingroup aesni
|
||||
*/
|
||||
|
||||
#ifndef AESNI_GCM_H_
|
||||
#define AESNI_GCM_H_
|
||||
|
||||
#include <library.h>
|
||||
|
||||
typedef struct aesni_gcm_t aesni_gcm_t;
|
||||
|
||||
/**
|
||||
* GCM mode AEAD using AES-NI
|
||||
*/
|
||||
struct aesni_gcm_t {
|
||||
|
||||
/**
|
||||
* Implements aead_t interface
|
||||
*/
|
||||
aead_t aead;
|
||||
};
|
||||
|
||||
/**
|
||||
* Create a aesni_gcm instance.
|
||||
*
|
||||
* @param algo encryption algorithm, ENCR_AES_GCM*
|
||||
* @param key_size AES key size, in bytes
|
||||
* @param salt_size size of salt value
|
||||
* @return AES-GCM AEAD, NULL if not supported
|
||||
*/
|
||||
aesni_gcm_t *aesni_gcm_create(encryption_algorithm_t algo,
|
||||
size_t key_size, size_t salt_size);
|
||||
|
||||
#endif /** AESNI_GCM_H_ @}*/
|
||||
|
|
@ -17,6 +17,7 @@
|
|||
#include "aesni_cbc.h"
|
||||
#include "aesni_ctr.h"
|
||||
#include "aesni_ccm.h"
|
||||
#include "aesni_gcm.h"
|
||||
#include "aesni_xcbc.h"
|
||||
#include "aesni_cmac.h"
|
||||
|
||||
|
|
@ -68,6 +69,16 @@ METHOD(plugin_t, get_features, int,
|
|||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV8, 32),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV12, 32),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV16, 32),
|
||||
PLUGIN_REGISTER(AEAD, aesni_gcm_create),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV8, 16),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV12, 16),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV16, 16),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV8, 24),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV12, 24),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV16, 24),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV8, 32),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV12, 32),
|
||||
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV16, 32),
|
||||
PLUGIN_REGISTER(PRF, aesni_xcbc_prf_create),
|
||||
PLUGIN_PROVIDE(PRF, PRF_AES128_XCBC),
|
||||
PLUGIN_REGISTER(SIGNER, aesni_xcbc_signer_create),
|
||||
|
|
@ -79,7 +90,7 @@ METHOD(plugin_t, get_features, int,
|
|||
};
|
||||
|
||||
*features = f;
|
||||
if (cpu_feature_available(CPU_FEATURE_AESNI))
|
||||
if (cpu_feature_available(CPU_FEATURE_AESNI | CPU_FEATURE_PCLMULQDQ))
|
||||
{
|
||||
return countof(f);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue