Add support for passing A1 into the digest

[InnovativeUS]

Introduce the ability to pass A1 as a value to Digest, allowing the use of a third party authentication service.

See https://datatracker.ietf.org/doc/html/rfc7616#section-3.4.2

"Because the server needs only use the hash of the user credentials in order to create the A1 value, this construction could be used in conjunction with a third-party authentication service so that the web server would not need the actual password value."

[icholy]

Code looks good, but can you explain the use-case a bit more (concrete examples are better). If you're passing A1 instead of the Username & Password, how are you using the returned Credentials? What does the calling code look like? Won't the empty username param cause issues in the formatted credentials?

digest/credentials.go

Lines 75 to 79 in f2e2eb0

	param.Param{
	Key: "username",
	Value: c.Username,
	Quote: true,
	},

[InnovativeUS]

We are using it so that we do not store username password in a SIP server but instead caching A1 from a third party authentication service. Hence the need to be able to pass in A1 vs Username / Password.

…

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[icholy]

Tagged as v1.1.0

[icholy]

Thank you for your contribution.