1 files changed, 31 insertions, 0 deletions
diff --git a/internal/contentenc/content_api.go b/internal/contentenc/content_api.go
new file mode 100644
index 0000000..1700d35
--- /dev/null
+++ b/internal/contentenc/content_api.go
@@ -0,0 +1,31 @@
+package contentenc
+
+import "github.com/rfjakob/gocryptfs/internal/cryptocore"
+
+type ContentEnc struct {
+	// Cryptographic primitives
+	cryptoCore *cryptocore.CryptoCore
+	// Plaintext block size
+	plainBS     uint64
+	// Ciphertext block size
+	cipherBS    uint64
+	// All-zero block of size cipherBS, for fast compares
+	allZeroBlock []byte
+}
+
+func New(cc *cryptocore.CryptoCore, plainBS uint64) *ContentEnc {
+
+	cipherBS := plainBS + uint64(cc.IVLen) + cryptocore.AuthTagLen
+
+	return &ContentEnc{
+		cryptoCore: cc,
+		plainBS: plainBS,
+		cipherBS: cipherBS,
+		allZeroBlock: make([]byte, cipherBS),
+	}
+}
+
+
+func (be *ContentEnc) PlainBS() uint64 {
+	return be.plainBS
+}