linux-kernel - Re: [PATCH v5 06/11] crypto: qce: skcipher: Return error for non-blocksize data(ECB/CBC algorithms)

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Message-ID: <YBx6S+up7YD2eCuU@gmail.com>
Date:   Thu, 4 Feb 2021 14:50:51 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     herbert@...dor.apana.org.au, davem@...emloft.net,
        bjorn.andersson@...aro.org, ardb@...nel.org,
        sivaprak@...eaurora.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 06/11] crypto: qce: skcipher: Return error for
 non-blocksize data(ECB/CBC algorithms)

On Thu, Feb 04, 2021 at 04:43:54PM -0500, Thara Gopinath wrote:
> +	/*
> +	 * ECB and CBC algorithms require message lengths to be
> +	 * multiples of block size.
> +	 * TODO: The spec says AES CBC mode for certain versions
> +	 * of crypto engine can handle partial blocks as well.
> +	 * Test and enable such messages.
> +	 */
> +	if (IS_ECB(rctx->flags) || IS_CBC(rctx->flags))
> +		if (!IS_ALIGNED(req->cryptlen, blocksize))
> +			return -EINVAL;

CBC by definition only operates on full blocks, so the TODO doesn't make sense.
Is the partial block support really CTS-CBC?

- Eric