Translating algorithm/code from Ruby to PHP

digest = HMAC.digest(Digest.new(SHA1), Base64.decode64(key), HashString) return Base64.encode64(digest.to_s()).chomp()

What would开发者_Python百科 the above be in PHP?

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This should do it:

$digest = hash_hmac("sha1", $hash_string, base64_decode($key), true);
return base64_encode($digest);