What is the version of AES used in encrypt() function?

[André de Souza Rosa]

Hello, could you tell me which version of AES is used in the Encrypt() function? Is there a possibility to configure a specific version for it?
I didn't find anything in the documentation that clarified this point.

https://firebirdsql.org/file/documentation/chunk/en/refdocs/fblangref40/fblangref40-scalarfuncs-crypto.html#fblangref40-scalarfuncs-encrypt

Thanks in advance for your attention

[Dimitry Sibiryakov]

André de Souza Rosa wrote 24.05.2023 20:58:
> Hello, could you tell me which version of AES is used in the Encrypt() function?
> Is there a possibility to configure a specific version for it?

There is only one version of AES. The difference is only in key size.

> I didn't find anything in the documentation that clarified this point.

Quote from your link:

> Sizes of data strings (like key and iv) must meet the requirements of the selected algorithm and mode, see table Table 8.11.2.2, Encryption Algorithm Requirements.
> Table 8.11.2.2 Encryption Algorithm Requirements
> Algorithm Key size (bytes) Block size (bytes) Notes
>
> AES 16, 24, 32


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WBR, SD.

[André de Souza Rosa]

Hello, indeed I expressed myself badly, I was referring to the key versions to be used. So, if I use a 16-byte key, I'm using AES-128, correct? Sorry if this is a very beginner question.

[Dimitry Sibiryakov]

André de Souza Rosa wrote 24.05.2023 21:37:
> So, if I use a 16-byte key, I'm using AES-128, correct?

Yes.

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WBR, SD.

[Mark Rotteveel]

On 24-05-2023 21:37, André de Souza Rosa wrote:
> Hello, indeed I expressed myself badly, I was referring to the key
> versions to be used. So, if I use a 16-byte key, I'm using AES-128,
> correct? Sorry if this is a very beginner question.

I'll add a note in the docs which AES variant is selected by which key size:

16 byte key -> AES-128
24 byte key -> AES-192
32 byte key -> AES-256

Mark
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Mark Rotteveel