filou/doc/fileformat.md

public key

Note that any private key are a public key.

private key

cypher format

We use the .cyp file extension for the encrypted file. A .cyp is nothing else than a zip file containing the following shit.

1. a data.encrypted containing the encrypted data
2. a meta_data.yml file containing the meta data of the encrypted file
   • symetric encryption algorithm
   • mode
   • encrypted symetric key
   • hash of the encrypted data (always use full for validation)
3. a 'signature' file with the signature of the meta_data.yml file func (this *RsaSha512) encrypt() ([]byte, error) {}

	 _____________________________________________________________________________
	|           
	|	Envelop:  zip file, no compression, no encryption
	|	 ________________________________________________________________________
	|	|	
	|	|	Paiload key:  cyphered by target pulic key
	|	|________________________________________________________________________
	|
	|	 _________________________________________________________________________
	|	|	
	|	|	Envelop meta data:  encryption type, mode, Paiload signature (yaml)
	|	|__________________________________________________________________________
	|
	|	 __________________________________________________________________________
	|	|	
	|	|	Paiload:  Zip file, no compression, symetrcally encrypted
	|	|	 _____________________________________________________________________
	|	|	|
	|	|	|	paiload intern metadata: Data signature, sender, message,... 
	|	|	|______________________________________________________________________
	|	|	
	|	|	 _______________________________________________________________________
	|	|	|
	|	|	|	Data:  Zip file, high compression
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	|	|	|____________________________________________________________________
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	|	|_________________________________________________________________________
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	|______________________________________________________________________________