172 lines
5.7 KiB
Diff
172 lines
5.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
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Date: Sun, 5 Jan 2020 22:40:49 -0500
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Subject: [PATCH] crypto: {arm,arm64,mips}/poly1305 - remove redundant
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non-reduction from emit
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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commit 31899908a0d248b030b4464425b86c717e0007d4 upstream.
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This appears to be some kind of copy and paste error, and is actually
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dead code.
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Pre: f = 0 ⇒ (f >> 32) = 0
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f = (f >> 32) + le32_to_cpu(digest[0]);
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Post: 0 ≤ f < 2³²
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put_unaligned_le32(f, dst);
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Pre: 0 ≤ f < 2³² ⇒ (f >> 32) = 0
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f = (f >> 32) + le32_to_cpu(digest[1]);
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Post: 0 ≤ f < 2³²
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put_unaligned_le32(f, dst + 4);
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Pre: 0 ≤ f < 2³² ⇒ (f >> 32) = 0
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f = (f >> 32) + le32_to_cpu(digest[2]);
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Post: 0 ≤ f < 2³²
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put_unaligned_le32(f, dst + 8);
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Pre: 0 ≤ f < 2³² ⇒ (f >> 32) = 0
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f = (f >> 32) + le32_to_cpu(digest[3]);
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Post: 0 ≤ f < 2³²
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put_unaligned_le32(f, dst + 12);
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Therefore this sequence is redundant. And Andy's code appears to handle
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misalignment acceptably.
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Tested-by: Ard Biesheuvel <ardb@kernel.org>
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Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
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Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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---
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arch/arm/crypto/poly1305-glue.c | 18 ++----------------
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arch/arm64/crypto/poly1305-glue.c | 18 ++----------------
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arch/mips/crypto/poly1305-glue.c | 18 ++----------------
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3 files changed, 6 insertions(+), 48 deletions(-)
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--- a/arch/arm/crypto/poly1305-glue.c
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+++ b/arch/arm/crypto/poly1305-glue.c
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@@ -20,7 +20,7 @@
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void poly1305_init_arm(void *state, const u8 *key);
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void poly1305_blocks_arm(void *state, const u8 *src, u32 len, u32 hibit);
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-void poly1305_emit_arm(void *state, __le32 *digest, const u32 *nonce);
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+void poly1305_emit_arm(void *state, u8 *digest, const u32 *nonce);
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void __weak poly1305_blocks_neon(void *state, const u8 *src, u32 len, u32 hibit)
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{
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@@ -179,9 +179,6 @@ EXPORT_SYMBOL(poly1305_update_arch);
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void poly1305_final_arch(struct poly1305_desc_ctx *dctx, u8 *dst)
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{
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- __le32 digest[4];
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- u64 f = 0;
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-
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if (unlikely(dctx->buflen)) {
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dctx->buf[dctx->buflen++] = 1;
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memset(dctx->buf + dctx->buflen, 0,
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@@ -189,18 +186,7 @@ void poly1305_final_arch(struct poly1305
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poly1305_blocks_arm(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0);
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}
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- poly1305_emit_arm(&dctx->h, digest, dctx->s);
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-
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- /* mac = (h + s) % (2^128) */
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- f = (f >> 32) + le32_to_cpu(digest[0]);
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- put_unaligned_le32(f, dst);
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- f = (f >> 32) + le32_to_cpu(digest[1]);
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- put_unaligned_le32(f, dst + 4);
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- f = (f >> 32) + le32_to_cpu(digest[2]);
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- put_unaligned_le32(f, dst + 8);
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- f = (f >> 32) + le32_to_cpu(digest[3]);
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- put_unaligned_le32(f, dst + 12);
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-
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+ poly1305_emit_arm(&dctx->h, dst, dctx->s);
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*dctx = (struct poly1305_desc_ctx){};
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}
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EXPORT_SYMBOL(poly1305_final_arch);
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--- a/arch/arm64/crypto/poly1305-glue.c
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+++ b/arch/arm64/crypto/poly1305-glue.c
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@@ -21,7 +21,7 @@
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asmlinkage void poly1305_init_arm64(void *state, const u8 *key);
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asmlinkage void poly1305_blocks(void *state, const u8 *src, u32 len, u32 hibit);
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asmlinkage void poly1305_blocks_neon(void *state, const u8 *src, u32 len, u32 hibit);
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-asmlinkage void poly1305_emit(void *state, __le32 *digest, const u32 *nonce);
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+asmlinkage void poly1305_emit(void *state, u8 *digest, const u32 *nonce);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
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@@ -162,9 +162,6 @@ EXPORT_SYMBOL(poly1305_update_arch);
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void poly1305_final_arch(struct poly1305_desc_ctx *dctx, u8 *dst)
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{
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- __le32 digest[4];
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- u64 f = 0;
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-
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if (unlikely(dctx->buflen)) {
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dctx->buf[dctx->buflen++] = 1;
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memset(dctx->buf + dctx->buflen, 0,
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@@ -172,18 +169,7 @@ void poly1305_final_arch(struct poly1305
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poly1305_blocks(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0);
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}
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- poly1305_emit(&dctx->h, digest, dctx->s);
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-
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- /* mac = (h + s) % (2^128) */
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- f = (f >> 32) + le32_to_cpu(digest[0]);
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- put_unaligned_le32(f, dst);
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- f = (f >> 32) + le32_to_cpu(digest[1]);
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- put_unaligned_le32(f, dst + 4);
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- f = (f >> 32) + le32_to_cpu(digest[2]);
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- put_unaligned_le32(f, dst + 8);
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- f = (f >> 32) + le32_to_cpu(digest[3]);
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- put_unaligned_le32(f, dst + 12);
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-
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+ poly1305_emit(&dctx->h, dst, dctx->s);
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*dctx = (struct poly1305_desc_ctx){};
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}
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EXPORT_SYMBOL(poly1305_final_arch);
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--- a/arch/mips/crypto/poly1305-glue.c
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+++ b/arch/mips/crypto/poly1305-glue.c
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@@ -15,7 +15,7 @@
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asmlinkage void poly1305_init_mips(void *state, const u8 *key);
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asmlinkage void poly1305_blocks_mips(void *state, const u8 *src, u32 len, u32 hibit);
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-asmlinkage void poly1305_emit_mips(void *state, __le32 *digest, const u32 *nonce);
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+asmlinkage void poly1305_emit_mips(void *state, u8 *digest, const u32 *nonce);
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void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 *key)
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{
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@@ -134,9 +134,6 @@ EXPORT_SYMBOL(poly1305_update_arch);
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void poly1305_final_arch(struct poly1305_desc_ctx *dctx, u8 *dst)
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{
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- __le32 digest[4];
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- u64 f = 0;
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-
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if (unlikely(dctx->buflen)) {
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dctx->buf[dctx->buflen++] = 1;
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memset(dctx->buf + dctx->buflen, 0,
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@@ -144,18 +141,7 @@ void poly1305_final_arch(struct poly1305
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poly1305_blocks_mips(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0);
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}
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- poly1305_emit_mips(&dctx->h, digest, dctx->s);
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-
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- /* mac = (h + s) % (2^128) */
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- f = (f >> 32) + le32_to_cpu(digest[0]);
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- put_unaligned_le32(f, dst);
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- f = (f >> 32) + le32_to_cpu(digest[1]);
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- put_unaligned_le32(f, dst + 4);
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- f = (f >> 32) + le32_to_cpu(digest[2]);
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- put_unaligned_le32(f, dst + 8);
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- f = (f >> 32) + le32_to_cpu(digest[3]);
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- put_unaligned_le32(f, dst + 12);
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-
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+ poly1305_emit_mips(&dctx->h, dst, dctx->s);
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*dctx = (struct poly1305_desc_ctx){};
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}
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EXPORT_SYMBOL(poly1305_final_arch);
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