Image encryption/decryption support in skopeo

Signed-off-by: Harshal Patil <harshal.patil@in.ibm.com>
Signed-off-by: Brandon Lum <lumjjb@gmail.com>

vendor/github.com/containers/ocicrypt/config/constructors.go

@@ -0,0 +1,134 @@
+/*
+   Copyright The ocicrypt Authors.
+
+   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 config
+
+import (
+	"github.com/pkg/errors"
+)
+
+// EncryptWithJwe returns a CryptoConfig to encrypt with jwe public keys
+func EncryptWithJwe(pubKeys [][]byte) (CryptoConfig, error) {
+	dc := DecryptConfig{}
+	ep := map[string][][]byte{
+		"pubkeys": pubKeys,
+	}
+
+	return CryptoConfig{
+		EncryptConfig: &EncryptConfig{
+			Parameters:    ep,
+			DecryptConfig: dc,
+		},
+		DecryptConfig: &dc,
+	}, nil
+}
+
+// EncryptWithPkcs7 returns a CryptoConfig to encrypt with pkcs7 x509 certs
+func EncryptWithPkcs7(x509s [][]byte) (CryptoConfig, error) {
+	dc := DecryptConfig{}
+
+	ep := map[string][][]byte{
+		"x509s": x509s,
+	}
+
+	return CryptoConfig{
+		EncryptConfig: &EncryptConfig{
+			Parameters:    ep,
+			DecryptConfig: dc,
+		},
+		DecryptConfig: &dc,
+	}, nil
+}
+
+// EncryptWithGpg returns a CryptoConfig to encrypt with configured gpg parameters
+func EncryptWithGpg(gpgRecipients [][]byte, gpgPubRingFile []byte) (CryptoConfig, error) {
+	dc := DecryptConfig{}
+	ep := map[string][][]byte{
+		"gpg-recipients":     gpgRecipients,
+		"gpg-pubkeyringfile": {gpgPubRingFile},
+	}
+
+	return CryptoConfig{
+		EncryptConfig: &EncryptConfig{
+			Parameters:    ep,
+			DecryptConfig: dc,
+		},
+		DecryptConfig: &dc,
+	}, nil
+}
+
+// DecryptWithPrivKeys returns a CryptoConfig to decrypt with configured private keys
+func DecryptWithPrivKeys(privKeys [][]byte, privKeysPasswords [][]byte) (CryptoConfig, error) {
+	if len(privKeys) != len(privKeysPasswords) {
+		return CryptoConfig{}, errors.New("Length of privKeys should match length of privKeysPasswords")
+	}
+
+	dc := DecryptConfig{
+		Parameters: map[string][][]byte{
+			"privkeys":           privKeys,
+			"privkeys-passwords": privKeysPasswords,
+		},
+	}
+
+	ep := map[string][][]byte{}
+
+	return CryptoConfig{
+		EncryptConfig: &EncryptConfig{
+			Parameters:    ep,
+			DecryptConfig: dc,
+		},
+		DecryptConfig: &dc,
+	}, nil
+}
+
+// DecryptWithX509s returns a CryptoConfig to decrypt with configured x509 certs
+func DecryptWithX509s(x509s [][]byte) (CryptoConfig, error) {
+	dc := DecryptConfig{
+		Parameters: map[string][][]byte{
+			"x509s": x509s,
+		},
+	}
+
+	ep := map[string][][]byte{}
+
+	return CryptoConfig{
+		EncryptConfig: &EncryptConfig{
+			Parameters:    ep,
+			DecryptConfig: dc,
+		},
+		DecryptConfig: &dc,
+	}, nil
+}
+
+// DecryptWithGpgPrivKeys returns a CryptoConfig to decrypt with configured gpg private keys
+func DecryptWithGpgPrivKeys(gpgPrivKeys, gpgPrivKeysPwds [][]byte) (CryptoConfig, error) {
+	dc := DecryptConfig{
+		Parameters: map[string][][]byte{
+			"gpg-privatekeys":           gpgPrivKeys,
+			"gpg-privatekeys-passwords": gpgPrivKeysPwds,
+		},
+	}
+
+	ep := map[string][][]byte{}
+
+	return CryptoConfig{
+		EncryptConfig: &EncryptConfig{
+			Parameters:    ep,
+			DecryptConfig: dc,
+		},
+		DecryptConfig: &dc,
+	}, nil
+}