diff --git a/src/main/java/com/trilead/ssh2/crypto/cipher/AES.java b/src/main/java/com/trilead/ssh2/crypto/cipher/AES.java
index 3340a311..b8a9fbdb 100644
--- a/src/main/java/com/trilead/ssh2/crypto/cipher/AES.java
+++ b/src/main/java/com/trilead/ssh2/crypto/cipher/AES.java
@@ -44,6 +44,15 @@ public void transformBlock(byte[] src, int srcoff, byte[] dst, int dstoff) {
 		}
 	}
 
+	@Override
+	public void transformBlocks(byte[] src, int srcoff, byte[] dst, int dstoff, int numBlocks) {
+		try {
+			cipher.update(src, srcoff, numBlocks * AES_BLOCK_SIZE, dst, dstoff);
+		} catch (ShortBufferException e) {
+			throw new AssertionError(e);
+		}
+	}
+
 	/**
 	 * AES in CBC (Cipher Block Chaining) mode for SSH.
 	 */
diff --git a/src/main/java/com/trilead/ssh2/crypto/cipher/BlockCipher.java b/src/main/java/com/trilead/ssh2/crypto/cipher/BlockCipher.java
index 7c1abd41..b331943d 100644
--- a/src/main/java/com/trilead/ssh2/crypto/cipher/BlockCipher.java
+++ b/src/main/java/com/trilead/ssh2/crypto/cipher/BlockCipher.java
@@ -13,4 +13,11 @@ public interface BlockCipher
 	int getBlockSize();
 
 	void transformBlock(byte[] src, int srcoff, byte[] dst, int dstoff);
+
+	default void transformBlocks(byte[] src, int srcoff, byte[] dst, int dstoff, int numBlocks) {
+		int blockSize = getBlockSize();
+		for (int i = 0; i < numBlocks; i++) {
+			transformBlock(src, srcoff + i * blockSize, dst, dstoff + i * blockSize);
+		}
+	}
 }