Re: openssl_public_encrypt() length limitation
| From: | Pierre-Alain Joye | Date: | Sat, 24 Jan 2004 21:25:15 +0000 |
| Subject: | Re: openssl_public_encrypt() length limitation | ||
| References: | 1 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-7320@lists.php.net to get a copy of this message | ||
On Sat, 24 Jan 2004 18:26:15 +0000
Timm Friebe <thekid@thekid.de> wrote:
> Hello,
>
> first of all, I'm not into this at all, a colleague at work told me
> about this. The following is the problem: When enrypting data with
> openssl_public_encrypt(), this goes well up to a certain length
> (tested limit: 245 bytes of data to be encrypted), but as of a certain
> length(246 bytes), the function returns FALSE with no note whatsoever
> why it went wrong.
>
> Is this expected behaviour? Is the length of the input data limited or
> constrained by the length of the public key? In this case, shouldn't
> there be a warning?
The maximum length of the input depends of the padding mode:
PKCS1_PADDING max=rsalength-1
PKCS1_OAEP_PADDING max=rsalength-4
AFAIR :) Everyone with more clue: correct me if I'm wrong :)
pierre