The GHASH setkey() function uses SSE registers but fails to call
kernel_fpu_begin()/kernel_fpu_end(). Instead of adding these calls, and
then having to deal with the restriction that they cannot be called from
interrupt context, move the setkey() implementation to the C domain.
Note that setkey() does not use any particular SSE features and is not
expected to become a performance bottleneck.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
I suppose this should be marked for stable as well?
arch/x86/crypto/ghash-clmulni-intel_asm.S | 29 -----------------------------
arch/x86/crypto/ghash-clmulni-intel_glue.c | 12 +++++++++++-
2 files changed, 11 insertions(+), 30 deletions(-)
diff --git a/arch/x86/crypto/ghash-clmulni-intel_asm.S b/arch/x86/crypto/ghash-clmulni-intel_asm.S
index 586f41aac361..185fad49d86f 100644
--- a/arch/x86/crypto/ghash-clmulni-intel_asm.S
+++ b/arch/x86/crypto/ghash-clmulni-intel_asm.S
@@ -24,10 +24,6 @@
.align 16
.Lbswap_mask:
.octa 0x000102030405060708090a0b0c0d0e0f
-.Lpoly:
- .octa 0xc2000000000000000000000000000001
-.Ltwo_one:
- .octa 0x00000001000000000000000000000001
#define DATA %xmm0
#define SHASH %xmm1
@@ -134,28 +130,3 @@ ENTRY(clmul_ghash_update)
.Lupdate_just_ret:
ret
ENDPROC(clmul_ghash_update)
-
-/*
- * void clmul_ghash_setkey(be128 *shash, const u8 *key);
- *
- * Calculate hash_key << 1 mod poly
- */
-ENTRY(clmul_ghash_setkey)
- movaps .Lbswap_mask, BSWAP
- movups (%rsi), %xmm0
- PSHUFB_XMM BSWAP %xmm0
- movaps %xmm0, %xmm1
- psllq $1, %xmm0
- psrlq $63, %xmm1
- movaps %xmm1, %xmm2
- pslldq $8, %xmm1
- psrldq $8, %xmm2
- por %xmm1, %xmm0
- # reduction
- pshufd $0b00100100, %xmm2, %xmm1
- pcmpeqd .Ltwo_one, %xmm1
- pand .Lpoly, %xmm1
- pxor %xmm1, %xmm0
- movups %xmm0, (%rdi)
- ret
-ENDPROC(clmul_ghash_setkey)
diff --git a/arch/x86/crypto/ghash-clmulni-intel_glue.c b/arch/x86/crypto/ghash-clmulni-intel_glue.c
index 6759dd1135be..3945d8095e80 100644
--- a/arch/x86/crypto/ghash-clmulni-intel_glue.c
+++ b/arch/x86/crypto/ghash-clmulni-intel_glue.c
@@ -58,13 +58,23 @@ static int ghash_setkey(struct crypto_shash *tfm,
const u8 *key, unsigned int keylen)
{
struct ghash_ctx *ctx = crypto_shash_ctx(tfm);
+ be128 *x = (be128 *)key;
+ u64 a, b;
if (keylen != GHASH_BLOCK_SIZE) {
crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
- clmul_ghash_setkey(&ctx->shash, key);
+ /* perform multiplication by 'x' in GF(2^128) */
+ a = be64_to_cpu(x->a);
+ b = be64_to_cpu(x->b);
+
+ ctx->shash.a = (__be64)((b << 1) ^ (a >> 63));
+ ctx->shash.b = (__be64)((a << 1) | (b >> 63));
+
+ if (a >> 63)
+ ctx->shash.b ^= cpu_to_be64(0xc2);
return 0;
}
--
1.8.3.2
--
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