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			KDF(key_str, salt [, {info | iterations} [, kdf_name [, width ]]])
kdf_name is "hkdf" or "pbkdf2_hmac" (default).
width (in bits) can be any number divisible by 8,
by default it's taken from @@block_encryption_mode
iterations must be positive, and is 1000 by default
OpenSSL 1.0 doesn't support HKDF, so it'll return NULL.
This OpenSSL version is still used in SLES 12 and CentOS 7
		
	
			
		
			
				
	
	
		
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| # remove when no longer building with OpenSSL 1.0
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