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Re: Curl feature idea, download hash checking
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From: bruce via curl-users <curl-users_at_lists.haxx.se>
Date: Sat, 13 Jun 2026 14:56:46 -0400
as i recall decade ago. that was the mantra!. so maybe a few example of
how to accomplish this kind of process would be enough!!
On Sat, Jun 13, 2026, 9:25 AM Ray Satiro via curl-users <
curl-users_at_lists.haxx.se> wrote:
> On 6/12/2026 7:16 AM, Daniel Stenberg via curl-users wrote:
>
> On Fri, 12 Jun 2026, Ian Norton via curl-users wrote:
>
> curl -O URL —-hash sha256:HASH_VALUE
>
> Does this sound like a good idea?
>
>
> It is an idea that is often brought up but has never been materialized. Is
> it good? I think it depends on how it is done so that in the end people
> would use it.
>
>
> Many years ago I wrote CURLOPT_SHA256 / CURLINFO_SHA256 to calculate the
> hash of the transfer body as received but there wasn't any interest so it
> wasn't adopted see https://github.com/curl/curl/issues/1399
>
> These days sha256 is more common and we have sha256 calculation code
> already in libcurl. So that part would be easier. But to handle partially
> downloaded data, resumed data, etc, is still a complication. You can
> already pipe curl to sha256 for verification, and ghedo gives an example in
> that issue of how to do it.
>
> Basically if you can do the unix pipe style to an existing tool that can
> handle it then is it worth putting that tool's functionality in curl, I
> guess is the question. What I mean is like grep should be grep, curl should
> be curl etc
> --
> Unsubscribe: https://lists.haxx.se/mailman/listinfo/curl-users
> Etiquette: https://curl.se/mail/etiquette.html
>
Date: Sat, 13 Jun 2026 14:56:46 -0400
as i recall decade ago. that was the mantra!. so maybe a few example of
how to accomplish this kind of process would be enough!!
On Sat, Jun 13, 2026, 9:25 AM Ray Satiro via curl-users <
curl-users_at_lists.haxx.se> wrote:
> On 6/12/2026 7:16 AM, Daniel Stenberg via curl-users wrote:
>
> On Fri, 12 Jun 2026, Ian Norton via curl-users wrote:
>
> curl -O URL —-hash sha256:HASH_VALUE
>
> Does this sound like a good idea?
>
>
> It is an idea that is often brought up but has never been materialized. Is
> it good? I think it depends on how it is done so that in the end people
> would use it.
>
>
> Many years ago I wrote CURLOPT_SHA256 / CURLINFO_SHA256 to calculate the
> hash of the transfer body as received but there wasn't any interest so it
> wasn't adopted see https://github.com/curl/curl/issues/1399
>
> These days sha256 is more common and we have sha256 calculation code
> already in libcurl. So that part would be easier. But to handle partially
> downloaded data, resumed data, etc, is still a complication. You can
> already pipe curl to sha256 for verification, and ghedo gives an example in
> that issue of how to do it.
>
> Basically if you can do the unix pipe style to an existing tool that can
> handle it then is it worth putting that tool's functionality in curl, I
> guess is the question. What I mean is like grep should be grep, curl should
> be curl etc
> --
> Unsubscribe: https://lists.haxx.se/mailman/listinfo/curl-users
> Etiquette: https://curl.se/mail/etiquette.html
>
-- Unsubscribe: https://lists.haxx.se/mailman/listinfo/curl-users Etiquette: https://curl.se/mail/etiquette.htmlReceived on 2026-06-13