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structs.go
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structs.go
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//
// Copyright (c) SAS Institute Inc.
//
// 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 apk
import (
"crypto"
"crypto/x509"
"fmt"
)
type apkSigner struct {
SignedData apkRaw
Signatures []apkSignature
PublicKey []byte
}
type apkSignedData struct {
Digests []apkDigest
Certificates [][]byte
Attributes []apkAttribute
}
type apkAttribute struct {
ID uint32
Value []byte
}
type apkSignature apkAttribute
type apkDigest apkAttribute
func (sd *apkSignedData) ParseCertificates() (certs []*x509.Certificate, err error) {
certs = make([]*x509.Certificate, len(sd.Certificates))
for i, der := range sd.Certificates {
certs[i], err = x509.ParseCertificate(der)
if err != nil {
return nil, err
}
}
return
}
type sigType struct {
id uint32
hash crypto.Hash
alg x509.PublicKeyAlgorithm
pss bool
}
var sigTypes = []sigType{
sigType{0x0101, crypto.SHA256, x509.RSA, true}, // RSASSA-PSS with SHA2-256 digest
sigType{0x0102, crypto.SHA512, x509.RSA, true}, // RSASSA-PSS with SHA2-512 digest
sigType{0x0103, crypto.SHA256, x509.RSA, false}, // RSASSA-PKCS1-v1_5 with SHA2-256 digest
sigType{0x0104, crypto.SHA512, x509.RSA, false}, // RSASSA-PKCS1-v1_5 with SHA2-512 digest
sigType{0x0201, crypto.SHA256, x509.ECDSA, false}, // ECDSA with SHA2-256 digest
sigType{0x0202, crypto.SHA512, x509.ECDSA, false}, // ECDSA with SHA2-512 digest
sigType{0x0301, crypto.SHA256, x509.DSA, false}, // DSA with SHA2-256 digest
}
func sigTypeByID(id uint32) (st sigType, err error) {
for _, s := range sigTypes {
if s.id == id {
st = s
break
}
}
if st.id == 0 {
return st, fmt.Errorf("unknown signature type 0x%04x", id)
}
if !st.hash.Available() {
return st, fmt.Errorf("unsupported signature type 0x%04x", id)
}
return
}