Editing HMAC (section)

==Implementation==
The following [[pseudocode]] demonstrates how HMAC may be implemented. The block size is 512 bits (64 bytes) when using one of the following hash functions: SHA-1, MD5, RIPEMD-128.{{Ref RFC|2104|rsection=2}}
 '''{{blue|function}}''' hmac '''{{blue|is}}'''
     '''{{blue|input:}}'''
         key:        Bytes    {{green|// Array of bytes}}
         message:    Bytes    {{green|// Array of bytes to be hashed}}
         hash:       Function {{green|// The hash function to use (e.g. SHA-1)}}
         blockSize:  Integer  {{green|// The block size of the hash function (e.g. 64 bytes for SHA-1)}}
 
     {{green|// Compute the block sized key}}
     block_sized_key = computeBlockSizedKey(key, hash, blockSize)
 
     o_key_pad ← block_sized_key xor [0x5c blockSize]   {{green|// Outer padded key}}
     i_key_pad ← block_sized_key xor [0x36 blockSize]   {{green|// Inner padded key}}
 
     '''{{blue|return}}'''  hash(o_key_pad ∥ hash(i_key_pad ∥ message))
 
 '''{{blue|function}}''' computeBlockSizedKey '''{{blue|is}}'''
     '''{{blue|input:}}'''
         key:        Bytes    {{green|// Array of bytes}}
         hash:       Function {{green|// The hash function to use (e.g. SHA-1)}}
         blockSize:  Integer  {{green|// The block size of the hash function (e.g. 64 bytes for SHA-1)}}
  
     {{green|// Keys longer than ''blockSize'' are shortened by hashing them}}
     '''{{blue|if}}''' (length(key) > blockSize) '''{{Font color|blue|then}}'''
         key = hash(key)
 
     {{green|// Keys shorter than ''blockSize'' are padded to ''blockSize'' by padding with zeros on the right}}
     '''{{blue|if}}''' (length(key) < blockSize) '''{{Font color|blue|then}}'''
         '''{{blue|return}}'''  Pad(key, blockSize) {{green|// Pad key with zeros to make it ''blockSize'' bytes long}}
 
     '''{{blue|return}}'''  key