roHMAC

The HMAC component provides an interface to the OpenSSL HMAC functions. These functions generate a Message Authentication Code (MAC) based on a key, in such a way that no one without the key could plausibly generate the MAC. HMAC uses a digest (hash) algorithm to generate the MAC.

For additional information on the OpenSSL HMAC functions, please see: http://www.openssl.org/docs/crypto/hmac.html

Supported Digest Algorithms

The supported digest algorithms are the same as those supported by roEVPDigest.

Example

hmac = CreateObject("roHMAC")
signature_key = CreateObject("roByteArray")
signature_key.fromAsciiString(getKey())
if hmac.setup("sha1", signature_key) = 0
    message = CreateObject("roByteArray")
    message.fromAsciiString(getMessage())
    result = hmac.process(message)
    print result.toBase64String()
end if


hmac = CreateObject("roHMAC")
signature_key = CreateObject("roByteArray")
signature_key.fromAsciiString(getKey())
if hmac.setup("sha1", signature_key) = 0
    message1 = CreateObject("roByteArray")
    message1.fromAsciiString(getMessage1())
    hmac.update(message1)
    message2 = CreateObject("roByteArray")
    message2.fromAsciiString(getMessage2())
    hmac.update(message2)
    result = hmac.final()
    print result.toBase64String()
end if

Supported interfaces

• ifHMAC