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DinoChiesa avatar DinoChiesa commented on June 10, 2024 1

source should be a context variable containing ciphertext. not a ciphertext. Check the README for documentation and examples.

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DinoChiesa avatar DinoChiesa commented on June 10, 2024 1

This applies to GCM mode.
When the action is Encrypt, the authentication tag is appended to the output ciphertext. You can specify the number of bits to use for the tag with the tag-bits property. It defaults to 128 bits, or 16 bytes. If you want to extract the tag from the ciphertext, you can do that after the fact, by just grabbing the last 16 bytes of the ciphertext (or whatever tag length you used).

When the action is Decrypt, you can simply provide the ciphertext with the tag appended. If you happen to have a ciphertext and a separate tag, in other words if you have a ciphertext from a system that emits the tag separately, you can specify them both (the latter with the tag property), and the callout will "do the right thing".

I'll update the README to clarify this.. I just checked the README and it's pretty clear on this point, so I haven't updated it.

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Roaaabdullah avatar Roaaabdullah commented on June 10, 2024

@DinoChiesa Thanks for your quick response ,, I would like to ask you what If I wan to make AES GCM Encryption
Is my request correct ? I am wondering why it's not return the tag so I can use it when I decrypt the cipher-text

Curl Request:

curl --location --request POST 'http://XXXXXXXXX/aesjavatest/v1/encrypt' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode '[email protected]' \
--data-urlencode 'iv=c5b4039aadf01a1da13d04570da45265' \
--data-urlencode 'key=c5b4039aadf01a1da13d04570da45265' \
--data-urlencode 'aad=eyJ0eXAiOiJKV1QiLCJoZHIxIjoxMjMsImVuYyI6IkExMjhHQ00iLCJoZHIyIjp0cnVlLCJhbGciOiJSU0EtT0FFUC0yNTYifQ'

JavaCallout :

    <DisplayName>Java Callout-3</DisplayName>
    <Properties>
        <Property name="action">encrypt</Property>
        <Property name="debug">true</Property>
        <Property name="mode">GCM</Property>
        <Property name="padding">NoPadding</Property>
        <Property name="key">{request.formparam.key}</Property>
        <!--<Property name="decode-key">base64url</Property>-->
        <Property name="iv">{request.formparam.iv}</Property>
        <!--<Property name="decode-iv">base64url</Property>-->
        <Property name="source">request.formparam.cleartext</Property>
        <Property name="decode-source">none</Property>
        <Property name="aad">{request.formparam.aad}</Property>
            <Property name='encode-result'>base64</Property>
        <!--<Property name="utf8-decode-result">true</Property>-->
    </Properties>
    <ClassName>com.google.apigee.callouts.AesCryptoCallout</ClassName>
    <ResourceURL>java://apigee-callout-aes-crypto-20211122a.jar</ResourceURL>
</JavaCallout>

Response:

{
    "ciphertext": "AJnQOEIOYvYUYhGM5Vkh8IZ7LCqb05JK2RPkrG7904E=",
    "encoding": "base64",
    "cipher": "AES/GCM/NoPadding",
    "params": {
        "b16": {
            "key": "6335623430333961616466303161316461313364303435373064613435323635",
            "iv": "6335623430333961616466303161316461313364303435373064613435323635"
        },
        "b64": {
            "key": "YzViNDAzOWFhZGYwMWExZGExM2QwNDU3MGRhNDUyNjU=",
            "iv": "YzViNDAzOWFhZGYwMWExZGExM2QwNDU3MGRhNDUyNjU="
        }
    },
    "note": "To decrypt, you must pass the ciphertext, and a key and an IV."
}

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Roaaabdullah avatar Roaaabdullah commented on June 10, 2024

@DinoChiesa Thanks everything works fine now.

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