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crypto: aes - Export x86 AES encrypt/decrypt functions

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Intel AES-NI AES acceleration instructions touch XMM state, to use
that in soft_irq context, general x86 AES implementation is used as
fallback. The first parameter is changed from struct crypto_tfm * to
struct crypto_aes_ctx * to make it easier to deal with 16 bytes
alignment requirement of AES-NI implementation.

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 2009-01-09 17:25:50 +11:00 committed by Herbert Xu
parent 109568e110
commit 07bf44f869
4 changed files with 38 additions and 17 deletions
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18
arch/x86/crypto/aes-i586-asm_32.S
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@ -41,14 +41,14 @@
#define tlen 1024 // length of each of 4 'xor' arrays (256 32-bit words)
/* offsets to parameters with one register pushed onto stack */
#define tfm 8
#define ctx 8
#define out_blk 12
#define in_blk 16
/* offsets in crypto_tfm structure */
#define klen (crypto_tfm_ctx_offset + 480)
#define ekey (crypto_tfm_ctx_offset + 0)
#define dkey (crypto_tfm_ctx_offset + 240)
/* offsets in crypto_aes_ctx structure */
#define klen (480)
#define ekey (0)
#define dkey (240)
// register mapping for encrypt and decrypt subroutines
@ -217,7 +217,7 @@
do_col (table, r5,r0,r1,r4, r2,r3); /* idx=r5 */
// AES (Rijndael) Encryption Subroutine
/* void aes_enc_blk(struct crypto_tfm *tfm, u8 *out_blk, const u8 *in_blk) */
/* void aes_enc_blk(struct crypto_aes_ctx *ctx, u8 *out_blk, const u8 *in_blk) */
.global aes_enc_blk
@ -228,7 +228,7 @@
aes_enc_blk:
push %ebp
mov tfm(%esp),%ebp
mov ctx(%esp),%ebp
// CAUTION: the order and the values used in these assigns
// rely on the register mappings
@ -292,7 +292,7 @@ aes_enc_blk:
ret
// AES (Rijndael) Decryption Subroutine
/* void aes_dec_blk(struct crypto_tfm *tfm, u8 *out_blk, const u8 *in_blk) */
/* void aes_dec_blk(struct crypto_aes_ctx *ctx, u8 *out_blk, const u8 *in_blk) */
.global aes_dec_blk
@ -303,7 +303,7 @@ aes_enc_blk:
aes_dec_blk:
push %ebp
mov tfm(%esp),%ebp
mov ctx(%esp),%ebp
// CAUTION: the order and the values used in these assigns
// rely on the register mappings

6
arch/x86/crypto/aes-x86_64-asm_64.S
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@ -17,8 +17,6 @@
#include <asm/asm-offsets.h>
#define BASE crypto_tfm_ctx_offset
#define R1 %rax
#define R1E %eax
#define R1X %ax
@ -56,13 +54,13 @@
.align 8; \
FUNC: movq r1,r2; \
movq r3,r4; \
leaq BASE+KEY+48(r8),r9; \
leaq KEY+48(r8),r9; \
movq r10,r11; \
movl (r7),r5 ## E; \
movl 4(r7),r1 ## E; \
movl 8(r7),r6 ## E; \
movl 12(r7),r7 ## E; \
movl BASE+480(r8),r10 ## E; \
movl 480(r8),r10 ## E; \
xorl -48(r9),r5 ## E; \
xorl -44(r9),r1 ## E; \
xorl -40(r9),r6 ## E; \

20
arch/x86/crypto/aes_glue.c
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@ -5,17 +5,29 @@
#include <crypto/aes.h>
asmlinkage void aes_enc_blk(struct crypto_tfm *tfm, u8 *out, const u8 *in);
asmlinkage void aes_dec_blk(struct crypto_tfm *tfm, u8 *out, const u8 *in);
asmlinkage void aes_enc_blk(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in);
asmlinkage void aes_dec_blk(struct crypto_aes_ctx *ctx, u8 *out, const u8 *in);
void crypto_aes_encrypt_x86(struct crypto_aes_ctx *ctx, u8 *dst, const u8 *src)
{
aes_enc_blk(ctx, dst, src);
}
EXPORT_SYMBOL_GPL(crypto_aes_encrypt_x86);
void crypto_aes_decrypt_x86(struct crypto_aes_ctx *ctx, u8 *dst, const u8 *src)
{
aes_dec_blk(ctx, dst, src);
}
EXPORT_SYMBOL_GPL(crypto_aes_decrypt_x86);
static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
aes_enc_blk(tfm, dst, src);
aes_enc_blk(crypto_tfm_ctx(tfm), dst, src);
}
static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
aes_dec_blk(tfm, dst, src);
aes_dec_blk(crypto_tfm_ctx(tfm), dst, src);
}
static struct crypto_alg aes_alg = {

11
arch/x86/include/asm/aes.h Normal file
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@ -0,0 +1,11 @@
#ifndef ASM_X86_AES_H
#define ASM_X86_AES_H
#include <linux/crypto.h>
#include <crypto/aes.h>
void crypto_aes_encrypt_x86(struct crypto_aes_ctx *ctx, u8 *dst,
const u8 *src);
void crypto_aes_decrypt_x86(struct crypto_aes_ctx *ctx, u8 *dst,
const u8 *src);
#endif