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Google Crypto-js AES encryption

frasierphilips
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Last Modified: 2015-07-23
I'm trying to use Google's crypto-js package to AES encode data for submission to a payment portal (Sagepay using AES-128-CBC-PKCS5).  The specifications of the software exactly match Sage's requirements EXCEPT they specify AES-128 encryption.  The submissions are being rejected by Sage as gobbledygook however it's not clear why.  The only thing I can think is that Sage provide a passphrase rather than a Hex string and it says in Google's documentation that use of a passphrase causes the software to default to AES-256 - does anyone know any way to force it to use AES-128 even with a passphrase?  Also, crypto-js doesn't support PKCS5 however I've read elsewhere that PKCS7 is compatible, which is the crypto-js default.
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