Principal Service: Add support for multiple user accounts

services/vanadium/security/public_key.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file
 
 package main
 
 import (
         "crypto/ecdsa"
-        "crypto/elliptic"
         "crypto/md5"
-        "crypto/rand"
         "crypto/x509"
         "encoding"
         "errors"
         "fmt"
 )
 
 // hash identifies a cryptographic hash function approved for use in signature algorithms.
 type hash string
 
 const (
         sha1Hash   = hash("SHA1")   // sha1 cryptographic hash function defined in RFC3174.
         sha256Hash = hash("SHA256") // sha256 cryptographic hash function defined  in FIPS 180-4.
         sha384Hash = hash("SHA384") // sha384 cryptographic hash function defined in FIPS 180-2.
         sha512Hash = hash("SHA512") // sha512 cryptographic hash function defined in FIPS 180-2.
 )
 
-// newPrincipalKey generates an ECDSA (public, private) key pair.
-func newPrincipalKey() (publicKey, *ecdsa.PrivateKey, error) {
-        priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
-        if err != nil {
-                return nil, nil, err
-        }
-        return newECDSAPublicKey(&priv.PublicKey), priv, nil
-}
-
 // publicKey represents a public key using an unspecified algorithm.
 //
 // MarshalBinary returns the DER-encoded PKIX representation of the public key,
 // while UnmarshalPublicKey creates a PublicKey object from the marshaled bytes.
 //
 // String returns a human-readable representation of the public key.
 type publicKey interface {
         encoding.BinaryMarshaler
         fmt.Stringer
 
@@ skipping 53 matching lines @@
                 return &ecdsaPublicKey{v}, nil
         default:
                 return nil, errors.New(fmt.Sprintf("Unrecognized key: %T", key))
         }
 }
 
 // newECDSAPublicKey creates a publicKey object that uses the ECDSA algorithm and the provided ECDSA public key.
 func newECDSAPublicKey(key *ecdsa.PublicKey) publicKey {
         return &ecdsaPublicKey{key}
 }