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Hi,
I understand that you are receiving an error ”InvalidCiphertextException” when trying to import a key generated from the command “openssl rand -base64 32 > symmetric.key; openssl rand -base64 16 >> symmetric.key” .
In regards to your first question this would not be possible to use the command listed. You would need to ensure that the key material is a 256-bit symmetric key and the file size of the encrypted key material is 32 bytes. I am attaching the following documentation that goes over the error here (1).
For a guideline on symmetric key generation I am attaching the following documentation that has a step by step walk-through of how to create and import key material in AWS KMS (2). Lastly I am attaching the following that goes over the certain considerations when deciding to import key material into AWS KMS (3).
Let us know if you need any further information! I hope you have a great rest of your day!
References
(1) https://aws.amazon.com/premiumsupport/knowledge-center/invalidciphertext-kms/
(2) https://aws.amazon.com/premiumsupport/knowledge-center/import-keys-kms/
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