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I am encrypting a message using Crypto class methods. I have created a key as follows:

Blob cryptoKeyBlob = Crypto.generateAesKey(128);
String cryptoKeyString = EncodingUtil.base64Encode(cryptoKeyBlob);

I have stored this key in a custom setting. For encryption, I do the following:

Blob cryptoKeyBlob = EncodingUtil.base64Decode(setting.Crypto_Key__c);
Blob msgBlob = Blob.valueOf('my message to be encrypted');
Blob encryptedMsgBlob = Crypto.encryptWithManagedIV('AES128', cryptoKeyBlob, msgBlob);
String encryptedMsgString = EncodingUtil.base64Encode(encryptedMsgBlob);

The decryption is done as follows:

Blob cryptoKeyBlob = EncodingUtil.base64Decode(setting.Crypto_Key__c);
Blob encryptedMsgBlob = EncodingUtil.base64Decode(encryptedMsgString);
Blob decryptedMsgBlob = Crypto.decryptWithManagedIV('AES128', cryptoKeyBlob, encryptedMsgBlob);
String decryptedMsgString = decryptedMsgBlob.toString();

However during the decryption, it shows an error saying: Input length must be multiple of 16 when decrypting with padded cipher

When I check the debug logs the key Blob is 16 bit i.e. Blob[16]. Isn't 16 a multiple of 16? If I hard code the key string in the encryption and decryption process it works. I do not understand what am I doing wrong.

Any help will be appreciated.

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