crypto: ghash - Add PCLMULQDQ accelerated implementation
PCLMULQDQ is used to accelerate the most time-consuming part of GHASH, carry-less multiplication. More information about PCLMULQDQ can be found at: http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/ Because PCLMULQDQ changes XMM state, its usage must be enclosed with kernel_fpu_begin/end, which can be used only in process context, the acceleration is implemented as crypto_ahash. That is, request in soft IRQ context will be defered to the cryptd kernel thread. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Huang Ying
Herbert Xu
Родитель
4c6ab3ee4c
Коммит
0e1227d356
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@ -12,6 +12,7 @@ obj-$(CONFIG_CRYPTO_AES_X86_64) += aes-x86_64.o
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obj-$(CONFIG_CRYPTO_TWOFISH_X86_64) += twofish-x86_64.o
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obj-$(CONFIG_CRYPTO_SALSA20_X86_64) += salsa20-x86_64.o
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obj-$(CONFIG_CRYPTO_AES_NI_INTEL) += aesni-intel.o
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obj-$(CONFIG_CRYPTO_GHASH_CLMUL_NI_INTEL) += ghash-clmulni-intel.o
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obj-$(CONFIG_CRYPTO_CRC32C_INTEL) += crc32c-intel.o
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@ -24,3 +25,5 @@ twofish-x86_64-y := twofish-x86_64-asm_64.o twofish_glue.o
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salsa20-x86_64-y := salsa20-x86_64-asm_64.o salsa20_glue.o
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aesni-intel-y := aesni-intel_asm.o aesni-intel_glue.o
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ghash-clmulni-intel-y := ghash-clmulni-intel_asm.o ghash-clmulni-intel_glue.o
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@ -0,0 +1,157 @@
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/*
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* Accelerated GHASH implementation with Intel PCLMULQDQ-NI
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* instructions. This file contains accelerated part of ghash
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* implementation. More information about PCLMULQDQ can be found at:
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*
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* http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/
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*
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* Copyright (c) 2009 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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* Vinodh Gopal
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* Erdinc Ozturk
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* Deniz Karakoyunlu
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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 version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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.align 16
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.Lbswap_mask:
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.octa 0x000102030405060708090a0b0c0d0e0f
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.Lpoly:
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.octa 0xc2000000000000000000000000000001
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.Ltwo_one:
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.octa 0x00000001000000000000000000000001
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#define DATA %xmm0
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#define SHASH %xmm1
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#define T1 %xmm2
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#define T2 %xmm3
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#define T3 %xmm4
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#define BSWAP %xmm5
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#define IN1 %xmm6
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.text
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/*
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* __clmul_gf128mul_ble: internal ABI
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* input:
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* DATA: operand1
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* SHASH: operand2, hash_key << 1 mod poly
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* output:
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* DATA: operand1 * operand2 mod poly
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* changed:
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* T1
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* T2
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* T3
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*/
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__clmul_gf128mul_ble:
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movaps DATA, T1
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pshufd $0b01001110, DATA, T2
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pshufd $0b01001110, SHASH, T3
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pxor DATA, T2
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pxor SHASH, T3
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# pclmulqdq $0x00, SHASH, DATA # DATA = a0 * b0
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.byte 0x66, 0x0f, 0x3a, 0x44, 0xc1, 0x00
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# pclmulqdq $0x11, SHASH, T1 # T1 = a1 * b1
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.byte 0x66, 0x0f, 0x3a, 0x44, 0xd1, 0x11
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# pclmulqdq $0x00, T3, T2 # T2 = (a1 + a0) * (b1 + b0)
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.byte 0x66, 0x0f, 0x3a, 0x44, 0xdc, 0x00
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pxor DATA, T2
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pxor T1, T2 # T2 = a0 * b1 + a1 * b0
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movaps T2, T3
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pslldq $8, T3
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psrldq $8, T2
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pxor T3, DATA
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pxor T2, T1 # <T1:DATA> is result of
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# carry-less multiplication
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# first phase of the reduction
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movaps DATA, T3
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psllq $1, T3
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pxor DATA, T3
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psllq $5, T3
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pxor DATA, T3
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psllq $57, T3
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movaps T3, T2
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pslldq $8, T2
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psrldq $8, T3
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pxor T2, DATA
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pxor T3, T1
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# second phase of the reduction
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movaps DATA, T2
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psrlq $5, T2
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pxor DATA, T2
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psrlq $1, T2
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pxor DATA, T2
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psrlq $1, T2
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pxor T2, T1
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pxor T1, DATA
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ret
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/* void clmul_ghash_mul(char *dst, const be128 *shash) */
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ENTRY(clmul_ghash_mul)
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movups (%rdi), DATA
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movups (%rsi), SHASH
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movaps .Lbswap_mask, BSWAP
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pshufb BSWAP, DATA
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call __clmul_gf128mul_ble
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pshufb BSWAP, DATA
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movups DATA, (%rdi)
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ret
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/*
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* void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
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* const be128 *shash);
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*/
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ENTRY(clmul_ghash_update)
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cmp $16, %rdx
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jb .Lupdate_just_ret # check length
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movaps .Lbswap_mask, BSWAP
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movups (%rdi), DATA
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movups (%rcx), SHASH
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pshufb BSWAP, DATA
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.align 4
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.Lupdate_loop:
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movups (%rsi), IN1
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pshufb BSWAP, IN1
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pxor IN1, DATA
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call __clmul_gf128mul_ble
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sub $16, %rdx
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add $16, %rsi
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cmp $16, %rdx
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jge .Lupdate_loop
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pshufb BSWAP, DATA
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movups DATA, (%rdi)
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.Lupdate_just_ret:
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ret
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/*
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* void clmul_ghash_setkey(be128 *shash, const u8 *key);
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*
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* Calculate hash_key << 1 mod poly
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*/
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ENTRY(clmul_ghash_setkey)
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movaps .Lbswap_mask, BSWAP
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movups (%rsi), %xmm0
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pshufb BSWAP, %xmm0
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movaps %xmm0, %xmm1
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psllq $1, %xmm0
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psrlq $63, %xmm1
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movaps %xmm1, %xmm2
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pslldq $8, %xmm1
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psrldq $8, %xmm2
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por %xmm1, %xmm0
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# reduction
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pshufd $0b00100100, %xmm2, %xmm1
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pcmpeqd .Ltwo_one, %xmm1
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pand .Lpoly, %xmm1
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pxor %xmm1, %xmm0
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movups %xmm0, (%rdi)
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ret
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@ -0,0 +1,333 @@
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/*
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* Accelerated GHASH implementation with Intel PCLMULQDQ-NI
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* instructions. This file contains glue code.
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*
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* Copyright (c) 2009 Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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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 version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/crypto.h>
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#include <crypto/algapi.h>
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#include <crypto/cryptd.h>
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#include <crypto/gf128mul.h>
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#include <crypto/internal/hash.h>
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#include <asm/i387.h>
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#define GHASH_BLOCK_SIZE 16
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#define GHASH_DIGEST_SIZE 16
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void clmul_ghash_mul(char *dst, const be128 *shash);
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void clmul_ghash_update(char *dst, const char *src, unsigned int srclen,
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const be128 *shash);
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void clmul_ghash_setkey(be128 *shash, const u8 *key);
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struct ghash_async_ctx {
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struct cryptd_ahash *cryptd_tfm;
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};
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struct ghash_ctx {
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be128 shash;
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};
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struct ghash_desc_ctx {
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u8 buffer[GHASH_BLOCK_SIZE];
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u32 bytes;
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};
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static int ghash_init(struct shash_desc *desc)
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{
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struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
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memset(dctx, 0, sizeof(*dctx));
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return 0;
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}
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static int ghash_setkey(struct crypto_shash *tfm,
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const u8 *key, unsigned int keylen)
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{
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struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
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if (keylen != GHASH_BLOCK_SIZE) {
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crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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clmul_ghash_setkey(&ctx->shash, key);
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return 0;
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}
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static int ghash_update(struct shash_desc *desc,
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const u8 *src, unsigned int srclen)
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{
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struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
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struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
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u8 *dst = dctx->buffer;
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kernel_fpu_begin();
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if (dctx->bytes) {
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int n = min(srclen, dctx->bytes);
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u8 *pos = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
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dctx->bytes -= n;
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srclen -= n;
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while (n--)
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*pos++ ^= *src++;
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if (!dctx->bytes)
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clmul_ghash_mul(dst, &ctx->shash);
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}
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clmul_ghash_update(dst, src, srclen, &ctx->shash);
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kernel_fpu_end();
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if (srclen & 0xf) {
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src += srclen - (srclen & 0xf);
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srclen &= 0xf;
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dctx->bytes = GHASH_BLOCK_SIZE - srclen;
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while (srclen--)
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*dst++ ^= *src++;
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}
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return 0;
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}
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static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx)
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{
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u8 *dst = dctx->buffer;
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if (dctx->bytes) {
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u8 *tmp = dst + (GHASH_BLOCK_SIZE - dctx->bytes);
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while (dctx->bytes--)
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*tmp++ ^= 0;
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kernel_fpu_begin();
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clmul_ghash_mul(dst, &ctx->shash);
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kernel_fpu_end();
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}
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dctx->bytes = 0;
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}
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static int ghash_final(struct shash_desc *desc, u8 *dst)
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{
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struct ghash_desc_ctx *dctx = shash_desc_ctx(desc);
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struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm);
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u8 *buf = dctx->buffer;
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ghash_flush(ctx, dctx);
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memcpy(dst, buf, GHASH_BLOCK_SIZE);
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return 0;
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}
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static struct shash_alg ghash_alg = {
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.digestsize = GHASH_DIGEST_SIZE,
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.init = ghash_init,
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.update = ghash_update,
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.final = ghash_final,
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.setkey = ghash_setkey,
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.descsize = sizeof(struct ghash_desc_ctx),
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.base = {
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.cra_name = "__ghash",
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.cra_driver_name = "__ghash-pclmulqdqni",
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.cra_priority = 0,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = GHASH_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct ghash_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(ghash_alg.base.cra_list),
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},
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};
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static int ghash_async_init(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
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struct ahash_request *cryptd_req = ahash_request_ctx(req);
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struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
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if (irq_fpu_usable()) {
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memcpy(cryptd_req, req, sizeof(*req));
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ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
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return crypto_ahash_init(cryptd_req);
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} else {
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
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struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
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desc->tfm = child;
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desc->flags = req->base.flags;
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return crypto_shash_init(desc);
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}
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}
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static int ghash_async_update(struct ahash_request *req)
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{
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struct ahash_request *cryptd_req = ahash_request_ctx(req);
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if (irq_fpu_usable()) {
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
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struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
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memcpy(cryptd_req, req, sizeof(*req));
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ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
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return crypto_ahash_update(cryptd_req);
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} else {
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
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return shash_ahash_update(req, desc);
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}
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}
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static int ghash_async_final(struct ahash_request *req)
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{
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struct ahash_request *cryptd_req = ahash_request_ctx(req);
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if (irq_fpu_usable()) {
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
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struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
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memcpy(cryptd_req, req, sizeof(*req));
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ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
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return crypto_ahash_final(cryptd_req);
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} else {
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
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return crypto_shash_final(desc, req->result);
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}
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}
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static int ghash_async_digest(struct ahash_request *req)
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{
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struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
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struct ahash_request *cryptd_req = ahash_request_ctx(req);
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struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm;
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if (irq_fpu_usable()) {
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memcpy(cryptd_req, req, sizeof(*req));
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ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base);
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return crypto_ahash_digest(cryptd_req);
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} else {
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struct shash_desc *desc = cryptd_shash_desc(cryptd_req);
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struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm);
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desc->tfm = child;
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desc->flags = req->base.flags;
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return shash_ahash_digest(req, desc);
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}
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}
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static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm);
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struct crypto_ahash *child = &ctx->cryptd_tfm->base;
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int err;
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crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
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crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm)
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& CRYPTO_TFM_REQ_MASK);
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err = crypto_ahash_setkey(child, key, keylen);
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crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child)
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& CRYPTO_TFM_RES_MASK);
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return 0;
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}
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static int ghash_async_init_tfm(struct crypto_tfm *tfm)
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{
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struct cryptd_ahash *cryptd_tfm;
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struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
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cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni", 0, 0);
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if (IS_ERR(cryptd_tfm))
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return PTR_ERR(cryptd_tfm);
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ctx->cryptd_tfm = cryptd_tfm;
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crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
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sizeof(struct ahash_request) +
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crypto_ahash_reqsize(&cryptd_tfm->base));
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return 0;
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}
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static void ghash_async_exit_tfm(struct crypto_tfm *tfm)
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{
|
||||
struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm);
|
||||
|
||||
cryptd_free_ahash(ctx->cryptd_tfm);
|
||||
}
|
||||
|
||||
static struct ahash_alg ghash_async_alg = {
|
||||
.init = ghash_async_init,
|
||||
.update = ghash_async_update,
|
||||
.final = ghash_async_final,
|
||||
.setkey = ghash_async_setkey,
|
||||
.digest = ghash_async_digest,
|
||||
.halg = {
|
||||
.digestsize = GHASH_DIGEST_SIZE,
|
||||
.base = {
|
||||
.cra_name = "ghash",
|
||||
.cra_driver_name = "ghash-clmulni",
|
||||
.cra_priority = 400,
|
||||
.cra_flags = CRYPTO_ALG_TYPE_AHASH | CRYPTO_ALG_ASYNC,
|
||||
.cra_blocksize = GHASH_BLOCK_SIZE,
|
||||
.cra_type = &crypto_ahash_type,
|
||||
.cra_module = THIS_MODULE,
|
||||
.cra_list = LIST_HEAD_INIT(ghash_async_alg.halg.base.cra_list),
|
||||
.cra_init = ghash_async_init_tfm,
|
||||
.cra_exit = ghash_async_exit_tfm,
|
||||
},
|
||||
},
|
||||
};
|
||||
|
||||
static int __init ghash_pclmulqdqni_mod_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
if (!cpu_has_pclmulqdq) {
|
||||
printk(KERN_INFO "Intel PCLMULQDQ-NI instructions are not"
|
||||
" detected.\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
err = crypto_register_shash(&ghash_alg);
|
||||
if (err)
|
||||
goto err_out;
|
||||
err = crypto_register_ahash(&ghash_async_alg);
|
||||
if (err)
|
||||
goto err_shash;
|
||||
|
||||
return 0;
|
||||
|
||||
err_shash:
|
||||
crypto_unregister_shash(&ghash_alg);
|
||||
err_out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit ghash_pclmulqdqni_mod_exit(void)
|
||||
{
|
||||
crypto_unregister_ahash(&ghash_async_alg);
|
||||
crypto_unregister_shash(&ghash_alg);
|
||||
}
|
||||
|
||||
module_init(ghash_pclmulqdqni_mod_init);
|
||||
module_exit(ghash_pclmulqdqni_mod_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_DESCRIPTION("GHASH Message Digest Algorithm, "
|
||||
"acclerated by PCLMULQDQ-NI");
|
||||
MODULE_ALIAS("ghash");
|
||||
|
|
@ -248,6 +248,7 @@ extern const char * const x86_power_flags[32];
|
|||
#define cpu_has_x2apic boot_cpu_has(X86_FEATURE_X2APIC)
|
||||
#define cpu_has_xsave boot_cpu_has(X86_FEATURE_XSAVE)
|
||||
#define cpu_has_hypervisor boot_cpu_has(X86_FEATURE_HYPERVISOR)
|
||||
#define cpu_has_pclmulqdq boot_cpu_has(X86_FEATURE_PCLMULQDQ)
|
||||
|
||||
#if defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_64)
|
||||
# define cpu_has_invlpg 1
|
||||
|
|
|
|||
|
|
@ -440,6 +440,14 @@ config CRYPTO_WP512
|
|||
See also:
|
||||
<http://planeta.terra.com.br/informatica/paulobarreto/WhirlpoolPage.html>
|
||||
|
||||
config CRYPTO_GHASH_CLMUL_NI_INTEL
|
||||
tristate "GHASH digest algorithm (CLMUL-NI accelerated)"
|
||||
select CRYPTO_SHASH
|
||||
select CRYPTO_CRYPTD
|
||||
help
|
||||
GHASH is message digest algorithm for GCM (Galois/Counter Mode).
|
||||
The implementation is accelerated by CLMUL-NI of Intel.
|
||||
|
||||
comment "Ciphers"
|
||||
|
||||
config CRYPTO_AES
|
||||
|
|
|
|||
|
|
@ -711,6 +711,13 @@ struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(cryptd_ahash_child);
|
||||
|
||||
struct shash_desc *cryptd_shash_desc(struct ahash_request *req)
|
||||
{
|
||||
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
|
||||
return &rctx->desc;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(cryptd_shash_desc);
|
||||
|
||||
void cryptd_free_ahash(struct cryptd_ahash *tfm)
|
||||
{
|
||||
crypto_free_ahash(&tfm->base);
|
||||
|
|
|
|||
|
|
@ -39,6 +39,7 @@ static inline struct cryptd_ahash *__cryptd_ahash_cast(
|
|||
struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,
|
||||
u32 type, u32 mask);
|
||||
struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm);
|
||||
struct shash_desc *cryptd_shash_desc(struct ahash_request *req);
|
||||
void cryptd_free_ahash(struct cryptd_ahash *tfm);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
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