1 files changed, 195 insertions, 0 deletions
diff --git a/vendor/github.com/minio/minio-go/pkg/encrypt/server-side.go b/vendor/github.com/minio/minio-go/pkg/encrypt/server-side.go
new file mode 100644
index 000000000..2d3c70f00
--- /dev/null
+++ b/vendor/github.com/minio/minio-go/pkg/encrypt/server-side.go
@@ -0,0 +1,195 @@
+/*
+ * Minio Go Library for Amazon S3 Compatible Cloud Storage
+ * Copyright 2018 Minio, 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 encrypt
+
+import (
+	"crypto/md5"
+	"encoding/base64"
+	"encoding/json"
+	"errors"
+	"net/http"
+
+	"golang.org/x/crypto/argon2"
+)
+
+const (
+	// sseGenericHeader is the AWS SSE header used for SSE-S3 and SSE-KMS.
+	sseGenericHeader = "X-Amz-Server-Side-Encryption"
+
+	// sseKmsKeyID is the AWS SSE-KMS key id.
+	sseKmsKeyID = sseGenericHeader + "-Aws-Kms-Key-Id"
+	// sseEncryptionContext is the AWS SSE-KMS Encryption Context data.
+	sseEncryptionContext = sseGenericHeader + "-Encryption-Context"
+
+	// sseCustomerAlgorithm is the AWS SSE-C algorithm HTTP header key.
+	sseCustomerAlgorithm = sseGenericHeader + "-Customer-Algorithm"
+	// sseCustomerKey is the AWS SSE-C encryption key HTTP header key.
+	sseCustomerKey = sseGenericHeader + "-Customer-Key"
+	// sseCustomerKeyMD5 is the AWS SSE-C encryption key MD5 HTTP header key.
+	sseCustomerKeyMD5 = sseGenericHeader + "-Customer-Key-MD5"
+
+	// sseCopyCustomerAlgorithm is the AWS SSE-C algorithm HTTP header key for CopyObject API.
+	sseCopyCustomerAlgorithm = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Algorithm"
+	// sseCopyCustomerKey is the AWS SSE-C encryption key HTTP header key for CopyObject API.
+	sseCopyCustomerKey = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key"
+	// sseCopyCustomerKeyMD5 is the AWS SSE-C encryption key MD5 HTTP header key for CopyObject API.
+	sseCopyCustomerKeyMD5 = "X-Amz-Copy-Source-Server-Side-Encryption-Customer-Key-MD5"
+)
+
+// PBKDF creates a SSE-C key from the provided password and salt.
+// PBKDF is a password-based key derivation function
+// which can be used to derive a high-entropy cryptographic
+// key from a low-entropy password and a salt.
+type PBKDF func(password, salt []byte) ServerSide
+
+// DefaultPBKDF is the default PBKDF. It uses Argon2id with the
+// recommended parameters from the RFC draft (1 pass, 64 MB memory, 4 threads).
+var DefaultPBKDF PBKDF = func(password, salt []byte) ServerSide {
+	sse := ssec{}
+	copy(sse[:], argon2.IDKey(password, salt, 1, 64*1024, 4, 32))
+	return sse
+}
+
+// Type is the server-side-encryption method. It represents one of
+// the following encryption methods:
+//  - SSE-C: server-side-encryption with customer provided keys
+//  - KMS:   server-side-encryption with managed keys
+//  - S3:    server-side-encryption using S3 storage encryption
+type Type string
+
+const (
+	// SSEC represents server-side-encryption with customer provided keys
+	SSEC Type = "SSE-C"
+	// KMS represents server-side-encryption with managed keys
+	KMS Type = "KMS"
+	// S3 represents server-side-encryption using S3 storage encryption
+	S3 Type = "S3"
+)
+
+// ServerSide is a form of S3 server-side-encryption.
+type ServerSide interface {
+	// Type returns the server-side-encryption method.
+	Type() Type
+
+	// Marshal adds encryption headers to the provided HTTP headers.
+	// It marks an HTTP request as server-side-encryption request
+	// and inserts the required data into the headers.
+	Marshal(h http.Header)
+}
+
+// NewSSE returns a server-side-encryption using S3 storage encryption.
+// Using SSE-S3 the server will encrypt the object with server-managed keys.
+func NewSSE() ServerSide { return s3{} }
+
+// NewSSEKMS returns a new server-side-encryption using SSE-KMS and the provided Key Id and context.
+func NewSSEKMS(keyID string, context interface{}) (ServerSide, error) {
+	if context == nil {
+		return kms{key: keyID, hasContext: false}, nil
+	}
+	serializedContext, err := json.Marshal(context)
+	if err != nil {
+		return nil, err
+	}
+	return kms{key: keyID, context: serializedContext, hasContext: true}, nil
+}
+
+// NewSSEC returns a new server-side-encryption using SSE-C and the provided key.
+// The key must be 32 bytes long.
+func NewSSEC(key []byte) (ServerSide, error) {
+	if len(key) != 32 {
+		return nil, errors.New("encrypt: SSE-C key must be 256 bit long")
+	}
+	sse := ssec{}
+	copy(sse[:], key)
+	return sse, nil
+}
+
+// SSE transforms a SSE-C copy encryption into a SSE-C encryption.
+// It is the inverse of SSECopy(...).
+//
+// If the provided sse is no SSE-C copy encryption SSE returns
+// sse unmodified.
+func SSE(sse ServerSide) ServerSide {
+	if sse == nil || sse.Type() != SSEC {
+		return sse
+	}
+	if sse, ok := sse.(ssecCopy); ok {
+		return ssec(sse)
+	}
+	return sse
+}
+
+// SSECopy transforms a SSE-C encryption into a SSE-C copy
+// encryption. This is required for SSE-C key rotation or a SSE-C
+// copy where the source and the destination should be encrypted.
+//
+// If the provided sse is no SSE-C encryption SSECopy returns
+// sse unmodified.
+func SSECopy(sse ServerSide) ServerSide {
+	if sse == nil || sse.Type() != SSEC {
+		return sse
+	}
+	if sse, ok := sse.(ssec); ok {
+		return ssecCopy(sse)
+	}
+	return sse
+}
+
+type ssec [32]byte
+
+func (s ssec) Type() Type { return SSEC }
+
+func (s ssec) Marshal(h http.Header) {
+	keyMD5 := md5.Sum(s[:])
+	h.Set(sseCustomerAlgorithm, "AES256")
+	h.Set(sseCustomerKey, base64.StdEncoding.EncodeToString(s[:]))
+	h.Set(sseCustomerKeyMD5, base64.StdEncoding.EncodeToString(keyMD5[:]))
+}
+
+type ssecCopy [32]byte
+
+func (s ssecCopy) Type() Type { return SSEC }
+
+func (s ssecCopy) Marshal(h http.Header) {
+	keyMD5 := md5.Sum(s[:])
+	h.Set(sseCopyCustomerAlgorithm, "AES256")
+	h.Set(sseCopyCustomerKey, base64.StdEncoding.EncodeToString(s[:]))
+	h.Set(sseCopyCustomerKeyMD5, base64.StdEncoding.EncodeToString(keyMD5[:]))
+}
+
+type s3 struct{}
+
+func (s s3) Type() Type { return S3 }
+
+func (s s3) Marshal(h http.Header) { h.Set(sseGenericHeader, "AES256") }
+
+type kms struct {
+	key        string
+	context    []byte
+	hasContext bool
+}
+
+func (s kms) Type() Type { return KMS }
+
+func (s kms) Marshal(h http.Header) {
+	h.Set(sseGenericHeader, "aws:kms")
+	h.Set(sseKmsKeyID, s.key)
+	if s.hasContext {
+		h.Set(sseEncryptionContext, base64.StdEncoding.EncodeToString(s.context))
+	}
+}