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crypto/x509: add more detail to the error message arising from a missing hash function. #7735

agl opened this issue Apr 9, 2014 · 5 comments


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commented Apr 9, 2014

If a certificate is signed with a hash function that wasn't compiled in the error
message isn't bad, but could be better:

x509: certificate signed by unknown authority (possibly because of "x509: cannot
verify signature: algorithm unimplemented" while trying to verify candidate
authority certificate "CA Cert Signing Authority")

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commented Sep 15, 2014

Comment 1:

Labels changed: added release-go1.5, removed release-go1.4.


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commented Mar 21, 2017

(More details in closed dup #5301)


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commented Mar 22, 2017

@agl would the direct error message

x509: cannot verify signature: algorithm unimplemented

suffice? Catch it right after it has occured.
I took a break from studying Chemistry to get something in, I'll now need to compile a test when free, then submit a CL, probably on the weekend, if this is cool with you.


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commented Mar 24, 2017

I don't believe that the problem is that the error message is too long, but that it doesn't hint at a solution. I.e. perhaps it could hint that it might be a hash function that's not compiled in.


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commented Apr 29, 2017

CL mentions this issue.

@bradfitz bradfitz modified the milestones: Go1.10, Go1.9Maybe Jul 20, 2017

@rsc rsc modified the milestones: Go1.10, Go1.11 Nov 22, 2017

@rsc rsc removed the release-blocker label Nov 22, 2017

@ianlancetaylor ianlancetaylor modified the milestones: Go1.11, Go1.12 Jun 29, 2018

@andybons andybons modified the milestones: Go1.12, Go1.13 Feb 12, 2019

@andybons andybons removed this from the Go1.13 milestone Jul 8, 2019

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