Hi all - just learning how to use SSE-C with my S3 backend and was struggle with errors. Jumped to here and found out that the key must be a 32 bytes (which I later confirmed is part of AWS spec)
This is all fine but a small suggestion on documentation - I think could also mention the requirement on the rclone S3 documentation page when talking about " RCLONE_S3_SSE_CUSTOMER_KEY" and " --s3-sse-customer-key". That would save some hassle.
Also the relevant section says " * Provider: AWS,Ceph,ChinaMobile,Minio" which was also confusing me (coz I was using Provider "IDrive" and I wasn't sure if this was causing the errors)