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Add tlscurve option to specify TLS curve. (#442)
Valid values for this option are: P-224, P-256, P-384, and P-512. P-521 is the default curve used by the wallet config. Closes #441.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| // Copyright (c) 2016 The Decred developers | ||
| // Use of this source code is governed by an ISC | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| package cfgutil | ||
|
|
||
| import ( | ||
| "crypto/elliptic" | ||
| "fmt" | ||
| ) | ||
|
|
||
| // CurveID specifies a recognized curve through a constant value. | ||
| type CurveID int | ||
|
|
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| // Recognized curve IDs. | ||
| const ( | ||
| CurveP224 CurveID = iota | ||
| CurveP256 | ||
| CurveP384 | ||
| CurveP521 | ||
| ) | ||
|
|
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| // CurveFlag describes a curve and implements the flags.Marshaler and | ||
| // Unmarshaler interfaces so it can be used as a config struct field. | ||
| type CurveFlag struct { | ||
| curveID CurveID | ||
| } | ||
|
|
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| // NewCurveFlag creates a CurveFlag with a default curve. | ||
| func NewCurveFlag(defaultValue CurveID) *CurveFlag { | ||
| return &CurveFlag{defaultValue} | ||
| } | ||
|
|
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| // MarshalFlag satisifes the flags.Marshaler interface. | ||
| func (f *CurveFlag) MarshalFlag() (name string, err error) { | ||
| switch f.curveID { | ||
| case CurveP224: | ||
| name = "P-224" | ||
| case CurveP256: | ||
| name = "P-256" | ||
| case CurveP384: | ||
| name = "P-384" | ||
| case CurveP521: | ||
| name = "P-521" | ||
| default: | ||
| err = fmt.Errorf("unknown curve ID %v", int(f.curveID)) | ||
| } | ||
| return | ||
| } | ||
|
|
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| // UnmarshalFlag satisifes the flags.Unmarshaler interface. | ||
| func (f *CurveFlag) UnmarshalFlag(value string) error { | ||
| switch value { | ||
| case "P-224": | ||
| f.curveID = CurveP224 | ||
| case "P-256": | ||
| f.curveID = CurveP256 | ||
| case "P-384": | ||
| f.curveID = CurveP384 | ||
| case "P-521": | ||
| f.curveID = CurveP521 | ||
| default: | ||
| return fmt.Errorf("unrecognized curve %v", value) | ||
| } | ||
| return nil | ||
| } | ||
|
|
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| // Curve returns the elliptic.Curve specified by the flag. | ||
| func (f *CurveFlag) Curve() elliptic.Curve { | ||
| switch f.curveID { | ||
| case CurveP224: | ||
| return elliptic.P224() | ||
| case CurveP256: | ||
| return elliptic.P256() | ||
| case CurveP384: | ||
| return elliptic.P384() | ||
| case CurveP521: | ||
| return elliptic.P521() | ||
| default: | ||
| panic("unreachable") | ||
| } | ||
| } |
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