arm64/crypto: improve performance of GHASH algorithm
This patches modifies the GHASH secure hash implementation to switch to a
faster, polynomial multiplication based reduction instead of one that uses
shifts and rotates.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/crypto/ghash-ce-glue.c b/arch/arm64/crypto/ghash-ce-glue.c
index ef6aa69..833ec1e 100644
--- a/arch/arm64/crypto/ghash-ce-glue.c
+++ b/arch/arm64/crypto/ghash-ce-glue.c
@@ -67,7 +67,7 @@
blocks = len / GHASH_BLOCK_SIZE;
len %= GHASH_BLOCK_SIZE;
- kernel_neon_begin_partial(6);
+ kernel_neon_begin_partial(8);
pmull_ghash_update(blocks, ctx->digest, src, key,
partial ? ctx->buf : NULL);
kernel_neon_end();
@@ -89,7 +89,7 @@
memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial);
- kernel_neon_begin_partial(6);
+ kernel_neon_begin_partial(8);
pmull_ghash_update(1, ctx->digest, ctx->buf, key, NULL);
kernel_neon_end();
}