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43 lines
1.8 KiB
Go
43 lines
1.8 KiB
Go
// Copyright 2018 by David A. Golden. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package scram
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import (
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"crypto/sha1"
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"crypto/sha256"
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"hash"
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)
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// HashGeneratorFcn abstracts a factory function that returns a hash.Hash
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// value to be used for SCRAM operations. Generally, one would use the
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// provided package variables, `scram.SHA1` and `scram.SHA256`, for the most
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// common forms of SCRAM.
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type HashGeneratorFcn func() hash.Hash
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// SHA1 is a function that returns a crypto/sha1 hasher and should be used to
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// create Client objects configured for SHA-1 hashing.
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var SHA1 HashGeneratorFcn = func() hash.Hash { return sha1.New() }
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// SHA256 is a function that returns a crypto/sha256 hasher and should be used
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// to create Client objects configured for SHA-256 hashing.
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var SHA256 HashGeneratorFcn = func() hash.Hash { return sha256.New() }
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// NewClientUnprepped acts like NewClient, except none of the arguments will
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// be normalized via SASLprep. This is not generally recommended, but is
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// provided for users that may have custom normalization needs.
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func (f HashGeneratorFcn) NewClientUnprepped(username, password, authzID string) (*Client, error) {
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return newClient(username, password, authzID, f), nil
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}
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// NewServer constructs a SCRAM server component based on a given hash.Hash
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// factory receiver. To be maximally generic, it uses dependency injection to
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// handle credential lookup, which is the process of turning a username string
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// into a struct with stored credentials for authentication.
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func (f HashGeneratorFcn) NewServer(cl CredentialLookup) (*Server, error) {
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return newServer(cl, f)
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}
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