diff --git a/src/core/operations/TripleDESDecrypt.mjs b/src/core/operations/TripleDESDecrypt.mjs
index 7626eeab..8487509f 100644
--- a/src/core/operations/TripleDESDecrypt.mjs
+++ b/src/core/operations/TripleDESDecrypt.mjs
@@ -70,7 +70,7 @@ class TripleDESDecrypt extends Operation {
             inputType = args[3],
             outputType = args[4];
 
-        if (key.length !== 24) {
+        if (key.length !== 24 && key.length !== 16) {
             throw new OperationError(`Invalid key length: ${key.length} bytes
 
 Triple DES uses a key length of 24 bytes (192 bits).
@@ -85,7 +85,8 @@ Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
 
         input = Utils.convertToByteString(input, inputType);
 
-        const decipher = forge.cipher.createDecipher("3DES-" + mode, key);
+        const decipher = forge.cipher.createDecipher("3DES-" + mode,
+            key.length === 16 ? key + key.substring(0, 8) : key);
 
         /* Allow for a "no padding" mode */
         if (noPadding) {
diff --git a/src/core/operations/TripleDESEncrypt.mjs b/src/core/operations/TripleDESEncrypt.mjs
index 237020a2..720d155d 100644
--- a/src/core/operations/TripleDESEncrypt.mjs
+++ b/src/core/operations/TripleDESEncrypt.mjs
@@ -69,7 +69,7 @@ class TripleDESEncrypt extends Operation {
             inputType = args[3],
             outputType = args[4];
 
-        if (key.length !== 24) {
+        if (key.length !== 24 && key.length !== 16) {
             throw new OperationError(`Invalid key length: ${key.length} bytes
 
 Triple DES uses a key length of 24 bytes (192 bits).
@@ -84,7 +84,8 @@ Make sure you have specified the type correctly (e.g. Hex vs UTF8).`);
 
         input = Utils.convertToByteString(input, inputType);
 
-        const cipher = forge.cipher.createCipher("3DES-" + mode, key);
+        const cipher = forge.cipher.createCipher("3DES-" + mode,
+            key.length === 16 ? key + key.substring(0, 8) : key);
         cipher.start({iv: iv});
         cipher.update(forge.util.createBuffer(input));
         cipher.finish();