digest

        # OpenSSL::HMAC.digest

(from ruby core)
### Implementation from HMAC
---
    HMAC.digest(digest, key, data) -> aString

---

Returns the authentication code as a binary string. The *digest*
parameter specifies the digest algorithm to use. This may be a String
representing the algorithm name or an instance of OpenSSL::Digest.

### Example
    key = 'key'
    data = 'The quick brown fox jumps over the lazy dog'

    hmac = OpenSSL::HMAC.digest('SHA1', key, data)
    #=> "\xDE|\x9B\x85\xB8\xB7\x8A\xA6\xBC\x8Az6\xF7\n\x90p\x1C\x9D\xB4\xD9"


(from ruby core)
### Implementation from HMAC
---
    hmac.digest -> string

---

Returns the authentication code an instance represents as a binary
string.

### Example
    instance = OpenSSL::HMAC.new('key', 'SHA1')
    #=> f42bb0eeb018ebbd4597ae7213711ec60760843f
    instance.digest
    #=> "\xF4+\xB0\xEE\xB0\x18\xEB\xBDE\x97\xAEr\x13q\x1E\xC6\a`\x84?"