open-consul/vendor/github.com/SermoDigital/jose/crypto/rsa_utils.go

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2018-06-21 14:49:35 +00:00
package crypto
import (
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
)
// Errors specific to rsa_utils.
var (
ErrKeyMustBePEMEncoded = errors.New("invalid key: Key must be PEM encoded PKCS1 or PKCS8 private key")
ErrNotRSAPrivateKey = errors.New("key is not a valid RSA private key")
ErrNotRSAPublicKey = errors.New("key is not a valid RSA public key")
)
// ParseRSAPrivateKeyFromPEM parses a PEM encoded PKCS1 or PKCS8 private key.
func ParseRSAPrivateKeyFromPEM(key []byte) (*rsa.PrivateKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
var parsedKey interface{}
if parsedKey, err = x509.ParsePKCS1PrivateKey(block.Bytes); err != nil {
if parsedKey, err = x509.ParsePKCS8PrivateKey(block.Bytes); err != nil {
return nil, err
}
}
var pkey *rsa.PrivateKey
var ok bool
if pkey, ok = parsedKey.(*rsa.PrivateKey); !ok {
return nil, ErrNotRSAPrivateKey
}
return pkey, nil
}
// ParseRSAPublicKeyFromPEM parses PEM encoded PKCS1 or PKCS8 public key.
func ParseRSAPublicKeyFromPEM(key []byte) (*rsa.PublicKey, error) {
var err error
// Parse PEM block
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, ErrKeyMustBePEMEncoded
}
// Parse the key
var parsedKey interface{}
if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
if cert, err := x509.ParseCertificate(block.Bytes); err == nil {
parsedKey = cert.PublicKey
} else {
return nil, err
}
}
var pkey *rsa.PublicKey
var ok bool
if pkey, ok = parsedKey.(*rsa.PublicKey); !ok {
return nil, ErrNotRSAPublicKey
}
return pkey, nil
}