linux-kernel - Re: [PATCH v4 4/4] RISC-V: crypto: add accelerated GCM GHASH implementation

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Date:   Wed, 29 Mar 2023 18:37:16 +0000
From:   Eric Biggers <ebiggers@...nel.org>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     palmer@...belt.com, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu, herbert@...dor.apana.org.au,
        davem@...emloft.net, conor.dooley@...rochip.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, christoph.muellner@...ll.eu,
        Heiko Stuebner <heiko.stuebner@...ll.eu>
Subject: Re: [PATCH v4 4/4] RISC-V: crypto: add accelerated GCM GHASH
 implementation

Hi Heiko,

On Wed, Mar 29, 2023 at 04:06:42PM +0200, Heiko Stuebner wrote:
> diff --git a/arch/riscv/crypto/ghash-riscv64-zbc.pl b/arch/riscv/crypto/ghash-riscv64-zbc.pl
> new file mode 100644
> index 000000000000..691231ffa11c
> --- /dev/null
> +++ b/arch/riscv/crypto/ghash-riscv64-zbc.pl
> @@ -0,0 +1,400 @@
> +#! /usr/bin/env perl
> +# Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
> +#
> +# Licensed under the Apache License 2.0 (the "License").  You may not use
> +# this file except in compliance with the License.  You can obtain a copy
> +# in the file LICENSE in the source distribution or at
> +# https://www.openssl.org/source/license.html

My understanding is that code that is licensed under (only) the Apache License
2.0 cannot be included in GPLv2 programs such as the Linux kernel.

Is this code written by Andy Polyakov?  What's been done in the past for his
code is that he re-releases it in CRYPTOGAMS at
https://github.com/dot-asm/cryptogams with a Linux kernel compatible license.
The Linux kernel then takes the code from there instead of from OpenSSL.

- Eric