From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF2A1C43446 for ; Tue, 28 Jul 2020 07:19:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A83AB207F5 for ; Tue, 28 Jul 2020 07:19:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727936AbgG1HTL (ORCPT ); Tue, 28 Jul 2020 03:19:11 -0400 Received: from helcar.hmeau.com ([216.24.177.18]:54822 "EHLO fornost.hmeau.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727852AbgG1HTK (ORCPT ); Tue, 28 Jul 2020 03:19:10 -0400 Received: from gwarestrin.arnor.me.apana.org.au ([192.168.0.7]) by fornost.hmeau.com with smtp (Exim 4.92 #5 (Debian)) id 1k0JtD-0006OE-Pm; Tue, 28 Jul 2020 17:19:08 +1000 Received: by gwarestrin.arnor.me.apana.org.au (sSMTP sendmail emulation); Tue, 28 Jul 2020 17:19:07 +1000 From: "Herbert Xu" Date: Tue, 28 Jul 2020 17:19:07 +1000 Subject: [v3 PATCH 13/31] crypto: mips/chacha - Add support for chaining References: <20200728071746.GA22352@gondor.apana.org.au> To: Ard Biesheuvel , Stephan Mueller , Linux Crypto Mailing List , Eric Biggers Message-Id: Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org As it stands chacha cannot do chaining. That is, it has to handle each request as a whole. This patch adds support for chaining when the CRYPTO_TFM_REQ_MORE flag is set. Signed-off-by: Herbert Xu --- arch/mips/crypto/chacha-glue.c | 41 +++++++++++++++++++++++++++-------------- 1 file changed, 27 insertions(+), 14 deletions(-) diff --git a/arch/mips/crypto/chacha-glue.c b/arch/mips/crypto/chacha-glue.c index d1fd23e6ef844..658412bfdea29 100644 --- a/arch/mips/crypto/chacha-glue.c +++ b/arch/mips/crypto/chacha-glue.c @@ -7,9 +7,7 @@ */ #include -#include #include -#include #include #include @@ -26,16 +24,16 @@ void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv) } EXPORT_SYMBOL(chacha_init_arch); -static int chacha_mips_stream_xor(struct skcipher_request *req, - const struct chacha_ctx *ctx, const u8 *iv) +static int chacha_mips_stream_xor(struct skcipher_request *req, int nrounds) { + struct chacha_reqctx *rctx = skcipher_request_ctx(req); struct skcipher_walk walk; - u32 state[16]; + u32 *state = rctx->state; int err; - err = skcipher_walk_virt(&walk, req, false); + rctx->init = req->base.flags & CRYPTO_TFM_REQ_MORE; - chacha_init_generic(state, ctx->key, iv); + err = skcipher_walk_virt(&walk, req, false); while (walk.nbytes > 0) { unsigned int nbytes = walk.nbytes; @@ -44,7 +42,7 @@ static int chacha_mips_stream_xor(struct skcipher_request *req, nbytes = round_down(nbytes, walk.stride); chacha_crypt(state, walk.dst.virt.addr, walk.src.virt.addr, - nbytes, ctx->nrounds); + nbytes, nrounds); err = skcipher_walk_done(&walk, walk.nbytes - nbytes); } @@ -54,27 +52,39 @@ static int chacha_mips_stream_xor(struct skcipher_request *req, static int chacha_mips(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct chacha_reqctx *rctx = skcipher_request_ctx(req); struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm); - return chacha_mips_stream_xor(req, ctx, req->iv); + if (!rctx->init) + chacha_init_generic(rctx->state, ctx->key, req->iv); + + return chacha_mips_stream_xor(req, ctx->nrounds); } static int xchacha_mips(struct skcipher_request *req) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct chacha_reqctx *rctx = skcipher_request_ctx(req); struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm); - struct chacha_ctx subctx; - u32 state[16]; + int nrounds = ctx->nrounds; + u32 *state = rctx->state; u8 real_iv[16]; + u32 key[8]; + + if (rctx->init) + goto skip_init; chacha_init_generic(state, ctx->key, req->iv); - hchacha_block(state, subctx.key, ctx->nrounds); - subctx.nrounds = ctx->nrounds; + hchacha_block(state, key, nrounds); memcpy(&real_iv[0], req->iv + 24, 8); memcpy(&real_iv[8], req->iv + 16, 8); - return chacha_mips_stream_xor(req, &subctx, real_iv); + + chacha_init_generic(rctx->state, key, real_iv); + +skip_init: + return chacha_mips_stream_xor(req, nrounds); } static struct skcipher_alg algs[] = { @@ -90,6 +100,7 @@ static struct skcipher_alg algs[] = { .max_keysize = CHACHA_KEY_SIZE, .ivsize = CHACHA_IV_SIZE, .chunksize = CHACHA_BLOCK_SIZE, + .reqsize = sizeof(struct chacha_reqctx), .setkey = chacha20_setkey, .encrypt = chacha_mips, .decrypt = chacha_mips, @@ -105,6 +116,7 @@ static struct skcipher_alg algs[] = { .max_keysize = CHACHA_KEY_SIZE, .ivsize = XCHACHA_IV_SIZE, .chunksize = CHACHA_BLOCK_SIZE, + .reqsize = sizeof(struct chacha_reqctx), .setkey = chacha20_setkey, .encrypt = xchacha_mips, .decrypt = xchacha_mips, @@ -120,6 +132,7 @@ static struct skcipher_alg algs[] = { .max_keysize = CHACHA_KEY_SIZE, .ivsize = XCHACHA_IV_SIZE, .chunksize = CHACHA_BLOCK_SIZE, + .reqsize = sizeof(struct chacha_reqctx), .setkey = chacha12_setkey, .encrypt = xchacha_mips, .decrypt = xchacha_mips,