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Test SSE4.1 before using ChaCha20-Poly1305 asm.

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This change guards the ChaCha20-Poly1305 asm on having SSE4.1. The
pinsrb instruction that it uses requires this, which I didn't notice,
and so this would fail on Core 2 and older chips.

BUG=chromium:688384

Change-Id: I177e3492782a1a9974b6df29d26fc4809009ad48
Reviewed-on: https://boringssl-review.googlesource.com/13586
Reviewed-by: Adam Langley <alangley@gmail.com>
Commit-Queue: Adam Langley <alangley@gmail.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
This commit is contained in:
Adam Langley 2017-02-03 08:23:18 -08:00 committed by CQ bot account: commit-bot@chromium.org
parent 772a5bed7d
commit 5fa2cdf1ed
1 changed files with 12 additions and 4 deletions
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16
crypto/cipher/e_chacha20poly1305.c
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@ -18,6 +18,7 @@
#include <openssl/chacha.h>
#include <openssl/cipher.h>
#include <openssl/cpu.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/poly1305.h>
@ -35,7 +36,11 @@ struct aead_chacha20_poly1305_ctx {
#if defined(OPENSSL_X86_64) && !defined(OPENSSL_NO_ASM) && \
!defined(OPENSSL_WINDOWS)
static const int kHaveAsm = 1;
static int asm_capable(void) {
const int sse41_capable = (OPENSSL_ia32cap_P[1] & (1 << 19)) != 0;
return sse41_capable;
}
// chacha20_poly1305_open is defined in chacha20_poly1305_x86_64.pl. It
// decrypts |plaintext_len| bytes from |ciphertext| and writes them to
// |out_plaintext|. On entry, |aead_data| must contain the final 48 bytes of
@ -58,7 +63,10 @@ extern void chacha20_poly1305_seal(uint8_t *out_ciphertext,
size_t plaintext_len, const uint8_t *ad,
size_t ad_len, uint8_t *aead_data);
#else
static const int kHaveAsm = 0;
static int asm_capable(void) {
return 0;
}
static void chacha20_poly1305_open(uint8_t *out_plaintext,
const uint8_t *ciphertext,
@ -183,7 +191,7 @@ static int aead_chacha20_poly1305_seal(const EVP_AEAD_CTX *ctx, uint8_t *out,
alignas(16) uint8_t tag[48];
if (kHaveAsm) {
if (asm_capable()) {
OPENSSL_memcpy(tag, c20_ctx->key, 32);
OPENSSL_memset(tag + 32, 0, 4);
OPENSSL_memcpy(tag + 32 + 4, nonce, 12);
@ -231,7 +239,7 @@ static int aead_chacha20_poly1305_open(const EVP_AEAD_CTX *ctx, uint8_t *out,
plaintext_len = in_len - c20_ctx->tag_len;
alignas(16) uint8_t tag[48];
if (kHaveAsm) {
if (asm_capable()) {
OPENSSL_memcpy(tag, c20_ctx->key, 32);
OPENSSL_memset(tag + 32, 0, 4);
OPENSSL_memcpy(tag + 32 + 4, nonce, 12);