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pk.go
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pk.go
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package crypto
import (
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"hash"
"github.com/coinbase/baseca/pkg/types"
)
type RSASigner struct {
PrivateKey *rsa.PrivateKey
SignatureAlgorithm x509.SignatureAlgorithm
Hash func() (hash.Hash, crypto.Hash)
}
type ECDSASigner struct {
PrivateKey *ecdsa.PrivateKey
SignatureAlgorithm x509.SignatureAlgorithm
Hash func() (hash.Hash, crypto.Hash)
}
func (r *RSASigner) Sign(data []byte) ([]byte, error) {
hash, cryptoHash := r.Hash()
hash.Write(data)
hashedValue := hash.Sum(nil)
switch r.SignatureAlgorithm {
case x509.SHA256WithRSAPSS, x509.SHA384WithRSAPSS, x509.SHA512WithRSAPSS:
return rsa.SignPSS(rand.Reader, r.PrivateKey, cryptoHash, hashedValue, &rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthAuto,
})
default:
return rsa.SignPKCS1v15(rand.Reader, r.PrivateKey, cryptoHash, hashedValue)
}
}
func (e *ECDSASigner) Sign(data []byte) ([]byte, error) {
hash, _ := e.Hash()
hash.Write(data)
hashedValue := hash.Sum(nil)
return ecdsa.SignASN1(rand.Reader, e.PrivateKey, hashedValue)
}
func EncodeToPKCS8(pkBlock *pem.Block) (*pem.Block, error) {
var key interface{}
var err error
switch pkBlock.Type {
case types.RSA_PRIVATE_KEY.String():
key, err = x509.ParsePKCS1PrivateKey(pkBlock.Bytes)
case types.ECDSA_PRIVATE_KEY.String():
key, err = x509.ParseECPrivateKey(pkBlock.Bytes)
default:
return nil, fmt.Errorf("unsupported key type %s", pkBlock.Type)
}
if err != nil {
return nil, fmt.Errorf("failed to parse private key: %v", err)
}
pkcs8Bytes, err := x509.MarshalPKCS8PrivateKey(key)
if err != nil {
return nil, fmt.Errorf("failed to marshal to PKCS#8: %v", err)
}
pkcs8Encoding := &pem.Block{
Type: types.PKCS8_PRIVATE_KEY.String(), // PKCS#8 Encoding
Bytes: pkcs8Bytes,
}
return pkcs8Encoding, nil
}
func ReturnSignerInterface(pkBlock *pem.Block) (crypto.Signer, error) {
var key interface{}
var err error
switch pkBlock.Type {
case types.RSA_PRIVATE_KEY.String():
key, err = x509.ParsePKCS1PrivateKey(pkBlock.Bytes)
case types.ECDSA_PRIVATE_KEY.String():
key, err = x509.ParseECPrivateKey(pkBlock.Bytes)
default:
return nil, fmt.Errorf("unsupported key type %s", pkBlock.Type)
}
var signer crypto.Signer
var ok bool
if signer, ok = key.(crypto.Signer); !ok {
return nil, fmt.Errorf("failed to parse private key: %v", err)
}
return signer, nil
}