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conf.go
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conf.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package sw
import (
"crypto/elliptic"
"crypto/sha256"
"crypto/sha512"
"fmt"
"hash"
"golang.org/x/crypto/sha3"
)
type config struct {
ellipticCurve elliptic.Curve
hashFunction func() hash.Hash
aesBitLength int
rsaBitLength int
}
func (conf *config) setSecurityLevel(securityLevel int, hashFamily string) (err error) {
switch hashFamily {
case "SHA2":
err = conf.setSecurityLevelSHA2(securityLevel)
case "SHA3":
err = conf.setSecurityLevelSHA3(securityLevel)
default:
err = fmt.Errorf("Hash Family not supported [%s]", hashFamily)
}
return
}
func (conf *config) setSecurityLevelSHA2(level int) (err error) {
switch level {
case 256:
conf.ellipticCurve = elliptic.P256()
conf.hashFunction = sha256.New
conf.rsaBitLength = 2048
conf.aesBitLength = 32
case 384:
conf.ellipticCurve = elliptic.P384()
conf.hashFunction = sha512.New384
conf.rsaBitLength = 3072
conf.aesBitLength = 32
default:
err = fmt.Errorf("Security level not supported [%d]", level)
}
return
}
func (conf *config) setSecurityLevelSHA3(level int) (err error) {
switch level {
case 256:
conf.ellipticCurve = elliptic.P256()
conf.hashFunction = sha3.New256
conf.rsaBitLength = 2048
conf.aesBitLength = 32
case 384:
conf.ellipticCurve = elliptic.P384()
conf.hashFunction = sha3.New384
conf.rsaBitLength = 3072
conf.aesBitLength = 32
default:
err = fmt.Errorf("Security level not supported [%d]", level)
}
return
}