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Is there any conformance tests/sequences to validate AES-GCM & GHASH() implementation?

Details: I'm implementing AES-GSM, that's just for better understanding of that stuff, nothing more. Well I need to validate somehow my result. There is 'openssl' and some python libraries to do encryption but they allow to check only final encryption result and nothing else in between. I haven't seen anything at all to validate 'GHASH()' or 'multH()'.

Thanks.

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See here and here for some test vectors (the second link is actually likely a better place to start). You may have to deal with padding though.

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gcm-spec, this document has "AES Test Vectors" section in the end. There are a numerous test cases with all intermediate results for encryption and ghash. I found them a rather useful.

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You could try using Wycheproof test vectors as well

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