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 deferred to the cryptd kernel thread. Signed-off-by: Huang Ying <ying.hu...@intel.com> --- arch/x86/crypto/Makefile | 3 arch/x86/crypto/ghash-clmulni-intel_asm.S | 118 +++++++++ arch/x86/crypto/ghash-clmulni-intel_glue.c | 348 +++++++++++++++++++++++++++++ arch/x86/include/asm/cpufeature.h | 1 crypto/Kconfig | 8 crypto/cryptd.c | 7 include/crypto/cryptd.h | 1 7 files changed, 486 insertions(+) --- /dev/null +++ b/arch/x86/crypto/ghash-clmulni-intel_asm.S @@ -0,0 +1,118 @@ +/* + * Accelerated GHASH implementation with Intel PCLMULQDQ-NI + * instructions. This file contains accelerated gf128mul + * implementation. + * + * Copyright (c) 2009 Intel Corp. + * Author: Huang Ying <ying.hu...@intel.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + */ + +#include <linux/linkage.h> + +.text + +.align 16 +.Lbswap_mask: + .octa 0x000102030405060708090a0b0c0d0e0f + +/* void clmul_gf128mul_lle(be128 *r, const be128 *b) */ +ENTRY(clmul_gf128mul_lle) + movups (%rdi), %xmm0 # A + movups (%rsi), %xmm1 # B + # convert from lle to ble + movaps .Lbswap_mask, %xmm6 + pshufb %xmm6, %xmm0 + pshufb %xmm6, %xmm1 + movaps %xmm1, %xmm2 + #pclmulqdq $0x00, %xmm0, %xmm2 # A0 * B0 + .byte 0x66, 0x0f, 0x3a, 0x44, 0xd0, 0x00 + movaps %xmm1, %xmm3 + #pclmulqdq $0x01, %xmm0, %xmm3 # A0 * B1 + .byte 0x66, 0x0f, 0x3a, 0x44, 0xd8, 0x01 + movaps %xmm1, %xmm4 + #pclmulqdq $0x10, %xmm0, %xmm4 # A1 * B0 + .byte 0x66, 0x0f, 0x3a, 0x44, 0xe0, 0x10 + #pclmulqdq $0x11, %xmm0, %xmm1 # A1 * B1 + .byte 0x66, 0x0f, 0x3a, 0x44, 0xc8, 0x11 + movaps %xmm3, %xmm5 + pslldq $8, %xmm3 + psrldq $8, %xmm5 + movaps %xmm4, %xmm0 + pslldq $8, %xmm0 + psrldq $8, %xmm4 + pxor %xmm5, %xmm1 + pxor %xmm4, %xmm1 + pxor %xmm3, %xmm0 + pxor %xmm2, %xmm0 + + movaps %xmm0, %xmm3 + psrldq $8, %xmm3 + psrlq $63, %xmm3 + + movaps %xmm0, %xmm2 + psllq $1, %xmm2 + pslldq $8, %xmm0 + psrlq $63, %xmm0 + por %xmm2, %xmm0 + + movaps %xmm1, %xmm2 + psllq $1, %xmm2 + pslldq $8, %xmm1 + psrlq $63, %xmm1 + por %xmm2, %xmm1 + por %xmm3, %xmm1 + +/* reduce */ + + movl $0xe1, %eax + movd %eax, %xmm2 + pslldq $15, %xmm2 + + movaps %xmm0, %xmm3 + #pclmulqdq $0x11, %xmm2, %xmm0 + .byte 0x66, 0x0f, 0x3a, 0x44, 0xc2, 0x11 + #pclmulqdq $0x10, %xmm2, %xmm3 + .byte 0x66, 0x0f, 0x3a, 0x44, 0xda, 0x10 + movaps %xmm3, %xmm4 + pslldq $8, %xmm3 + psrldq $8, %xmm4 + pxor %xmm4, %xmm0 + + movaps %xmm3, %xmm4 + psrldq $8, %xmm4 + psrlq $63, %xmm4 + + movaps %xmm3, %xmm5 + psllq $1, %xmm5 + pslldq $8, %xmm3 + psrlq $63, %xmm3 + por %xmm5, %xmm3 + + movaps %xmm0, %xmm5 + psllq $1, %xmm5 + pslldq $8, %xmm0 + psrlq $63, %xmm0 + por %xmm5, %xmm0 + por %xmm4, %xmm0 + + pxor %xmm1, %xmm0 + + #pclmulqdq $0x11, %xmm2, %xmm3 + .byte 0x66, 0x0f, 0x3a, 0x44, 0xda, 0x11 + + movaps %xmm3, %xmm4 + psllq $1, %xmm4 + pslldq $8, %xmm3 + psrlq $63, %xmm3 + por %xmm4, %xmm3 + + pxor %xmm3, %xmm0 + + # convert from ble to lle + pshufb %xmm6, %xmm0 + movups %xmm0, (%rdi) + ret --- /dev/null +++ b/arch/x86/crypto/ghash-clmulni-intel_glue.c @@ -0,0 +1,348 @@ +/* + * Accelerated GHASH implementation with Intel PCLMULQDQ-NI + * instructions. This file contains glue code. + * + * Copyright (c) 2009 Intel Corp. + * Author: Huang Ying <ying.hu...@intel.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/crypto.h> +#include <crypto/algapi.h> +#include <crypto/gf128mul.h> +#include <crypto/internal/hash.h> +#include <crypto/cryptd.h> +#include <asm/i387.h> + +#define GHASH_BLOCK_SIZE 16 +#define GHASH_DIGEST_SIZE 16 + +void clmul_gf128mul_lle(be128 *r, const be128 *b); + +struct ghash_async_ctx +{ + struct cryptd_ahash *cryptd_tfm; +}; + +struct ghash_ctx { + be128 hash; +}; + +struct ghash_desc_ctx { + u8 buffer[16]; + u32 bytes; +}; + +static int ghash_init(struct shash_desc *desc) +{ + struct ghash_desc_ctx *dctx = shash_desc_ctx(desc); + + dctx->bytes = 0; + memset(dctx->buffer, 0, 16); + + return 0; +} + +static int ghash_setkey(struct crypto_shash *tfm, + const u8 *key, unsigned int keylen) +{ + struct ghash_ctx *ctx = crypto_shash_ctx(tfm); + + if (keylen != 16) { + crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + + memcpy(&ctx->hash, key, keylen); + + return 0; +} + +static int ghash_update(struct shash_desc *desc, + const u8 *src, unsigned int srclen) +{ + struct ghash_desc_ctx *dctx = shash_desc_ctx(desc); + struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm); + u8 *dst = dctx->buffer; + + kernel_fpu_begin(); + if (dctx->bytes) { + int n = min(srclen, dctx->bytes); + u8 *pos = dst + (16 - dctx->bytes); + + dctx->bytes -= n; + srclen -= n; + + while (n--) + *pos++ ^= *src++; + + if (!dctx->bytes) + clmul_gf128mul_lle((be128 *)dst, &ctx->hash); + } + + while (srclen >= 16) { + crypto_xor(dst, src, 16); + clmul_gf128mul_lle((be128 *)dst, &ctx->hash); + src += 16; + srclen -= 16; + } + kernel_fpu_end(); + + if (srclen) { + dctx->bytes = 16 - srclen; + while (srclen--) + *dst++ ^= *src++; + } + + return 0; +} + +static void ghash_flush(struct ghash_ctx *ctx, struct ghash_desc_ctx *dctx) +{ + u8 *dst = dctx->buffer; + + if (dctx->bytes) { + u8 *tmp = dst + (16 - dctx->bytes); + + while (dctx->bytes--) + *tmp++ ^= 0; + + kernel_fpu_begin(); + gf128mul_lle((be128 *)dst, &ctx->hash); + kernel_fpu_end(); + } + + dctx->bytes = 0; +} + +static int ghash_final(struct shash_desc *desc, u8 *dst) +{ + struct ghash_desc_ctx *dctx = shash_desc_ctx(desc); + struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm); + u8 *buf = dctx->buffer; + + ghash_flush(ctx, dctx); + memcpy(dst, buf, 16); + + return 0; +} + +static struct shash_alg ghash_alg = { + .digestsize = GHASH_DIGEST_SIZE, + .init = ghash_init, + .update = ghash_update, + .final = ghash_final, + .setkey = ghash_setkey, + .descsize = sizeof(struct ghash_desc_ctx), + .base = { + .cra_name = "__ghash", + .cra_driver_name = "__ghash-pclmulqdqni", + .cra_priority = 0, + .cra_flags = CRYPTO_ALG_TYPE_SHASH, + .cra_blocksize = GHASH_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct ghash_ctx), + .cra_module = THIS_MODULE, + .cra_list = LIST_HEAD_INIT(ghash_alg.base.cra_list), + }, +}; + +static int ghash_async_init(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct ahash_request *cryptd_req = ahash_request_ctx(req); + struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; + + if (kernel_fpu_using()) { + memcpy(cryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); + return crypto_ahash_init(cryptd_req); + } else { + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm); + + desc->tfm = child; + desc->flags = req->base.flags; + return crypto_shash_init(desc); + } +} + +static int ghash_async_update(struct ahash_request *req) +{ + struct ahash_request *cryptd_req = ahash_request_ctx(req); + + if (kernel_fpu_using()) { + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; + + memcpy(cryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); + return crypto_ahash_update(cryptd_req); + } else { + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + struct crypto_hash_walk walk; + int nbytes; + + for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; + nbytes = crypto_hash_walk_done(&walk, nbytes)) + nbytes = crypto_shash_update(desc, walk.data, nbytes); + return nbytes; + } +} + +static int ghash_async_final(struct ahash_request *req) +{ + struct ahash_request *cryptd_req = ahash_request_ctx(req); + + if (kernel_fpu_using()) { + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; + + memcpy(cryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); + return crypto_ahash_final(cryptd_req); + } else { + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + return crypto_shash_final(desc, req->result); + } +} + +static int ghash_async_digest(struct ahash_request *req) +{ + struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct ahash_request *cryptd_req = ahash_request_ctx(req); + struct cryptd_ahash *cryptd_tfm = ctx->cryptd_tfm; + + if (kernel_fpu_using()) { + memcpy(cryptd_req, req, sizeof(*req)); + ahash_request_set_tfm(cryptd_req, &cryptd_tfm->base); + return crypto_ahash_digest(cryptd_req); + } else { + struct shash_desc *desc = cryptd_shash_desc(cryptd_req); + struct crypto_shash *child = cryptd_ahash_child(cryptd_tfm); + struct crypto_hash_walk walk; + int nbytes; + int err; + + desc->tfm = child; + desc->flags = req->base.flags; + err = crypto_shash_init(desc); + if (err) + return err; + + for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0; + nbytes = crypto_hash_walk_done(&walk, nbytes)) + nbytes = crypto_shash_update(desc, walk.data, nbytes); + if (nbytes) + return nbytes; + + return crypto_shash_final(desc, req->result); + } +} + +static int ghash_async_setkey(struct crypto_ahash *tfm, const u8 *key, + unsigned int keylen) +{ + struct ghash_async_ctx *ctx = crypto_ahash_ctx(tfm); + struct crypto_ahash *child = &ctx->cryptd_tfm->base; + int err; + + crypto_ahash_clear_flags(child, CRYPTO_TFM_REQ_MASK); + crypto_ahash_set_flags(child, crypto_ahash_get_flags(tfm) + & CRYPTO_TFM_REQ_MASK); + err = crypto_ahash_setkey(child, key, keylen); + crypto_ahash_set_flags(tfm, crypto_ahash_get_flags(child) + & CRYPTO_TFM_RES_MASK); + + return 0; +} + +static int ghash_async_init_tfm(struct crypto_tfm *tfm) +{ + struct cryptd_ahash *cryptd_tfm; + struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm); + + cryptd_tfm = cryptd_alloc_ahash("__ghash-pclmulqdqni", 0, 0); + if (IS_ERR(cryptd_tfm)) + return PTR_ERR(cryptd_tfm); + ctx->cryptd_tfm = cryptd_tfm; + tfm->crt_ahash.reqsize = sizeof(struct ahash_request) + + crypto_ahash_reqsize(&cryptd_tfm->base); + + return 0; +} + +static void ghash_async_exit_tfm(struct crypto_tfm *tfm) +{ + struct ghash_async_ctx *ctx = crypto_tfm_ctx(tfm); + + cryptd_free_ahash(ctx->cryptd_tfm); +} + +static struct crypto_alg ghash_async_alg = { + .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.cra_list), + .cra_init = ghash_async_init_tfm, + .cra_exit = ghash_async_exit_tfm, + .cra_u = { + .ahash = { + .digestsize = GHASH_DIGEST_SIZE, + .init = ghash_async_init, + .update = ghash_async_update, + .final = ghash_async_final, + .setkey = ghash_async_setkey, + .digest = ghash_async_digest, + }, + }, +}; + +static int __init ghash_pclmulqdqni_mod_init(void) +{ + int err; + + if (!cpu_has_pclmulqdq) { + printk(KERN_ERR "Intel PCLMULQDQ-NI instructions are not" + " detected.\n"); + return -ENODEV; + } + + if ((err = crypto_register_shash(&ghash_alg))) + goto err_out; + if ((err = crypto_register_alg(&ghash_async_alg))) + 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_alg(&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"); --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -426,6 +426,14 @@ config CRYPTO_GHASH help GHASH is message digest algorithm for GCM (Galois/Counter Mode). +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 --- a/arch/x86/crypto/Makefile +++ b/arch/x86/crypto/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_CRYPTO_AES_X86_64) += aes-x obj-$(CONFIG_CRYPTO_TWOFISH_X86_64) += twofish-x86_64.o obj-$(CONFIG_CRYPTO_SALSA20_X86_64) += salsa20-x86_64.o obj-$(CONFIG_CRYPTO_AES_NI_INTEL) += aesni-intel.o +obj-$(CONFIG_CRYPTO_GHASH_CLMUL_NI_INTEL) += ghash-clmulni-intel.o obj-$(CONFIG_CRYPTO_CRC32C_INTEL) += crc32c-intel.o @@ -24,3 +25,5 @@ twofish-x86_64-y := twofish-x86_64-asm_6 salsa20-x86_64-y := salsa20-x86_64-asm_64.o salsa20_glue.o aesni-intel-y := aesni-intel_asm.o aesni-intel_glue.o + +ghash-clmulni-intel-y := ghash-clmulni-intel_asm.o ghash-clmulni-intel_glue.o --- a/arch/x86/include/asm/cpufeature.h +++ b/arch/x86/include/asm/cpufeature.h @@ -243,6 +243,7 @@ extern const char * const x86_power_flag #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 --- a/crypto/cryptd.c +++ b/crypto/cryptd.c @@ -677,6 +677,13 @@ struct crypto_shash *cryptd_ahash_child( } 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); --- a/include/crypto/cryptd.h +++ b/include/crypto/cryptd.h @@ -39,6 +39,7 @@ static inline struct cryptd_ahash *__cry 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 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
