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Results tagged with hmac
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user 39623
a method for constructing a message authentication code based on a cryptographic hash function.
69
votes
What's the difference between HMAC-SHA256(key, data) and SHA256(key + data)
Yes, HMAC is more complex than simple concatenation. … Then HMAC is defined as:
HASH(Key XOR opad, HASH(Key XOR ipad, text))
or, in detail from the RFC,
(Pretext: The definition of HMAC requires a cryptographic hash function, which
we denote by H, …
1
vote
How to simply and efficiently generate different keys from one password?
CodesInChaos makes two good points - don't exceed the natural output size of your underlying hash (160 bits for PBKDF2-HMAC-SHA-1, 512 bits for PBKDF2-HMAC-SHA-512, etc.), and a 128 bit salt is probably …
11
votes
HMACSHA512 versus Rfc2898DeriveBytes for password hash
However, @Jither created a nice example of adding PBKDF2-HMAC-SHA256, PBKDF2-HMAC-SHA384, PBKDF2-HMAC-SHA512, etc. capabilities to .NET, and I've included a variant with a reasonable set of test vectors … For another reference related to an actual design flaw in 1Password, see this Hashcat forum thread - "For each iteration of PBKDF2-HMAC-SHA1 you call 4 times the SHA1 transform. …