Dr S N Henson wrote:
> "Jason A. Aras" wrote:
>
>> I am working on a quick C hack to test out the use of the RSA encryption
>> functions. When i make a call to RSA_public_encrypt() it sometimes
>> fails (but does not return a -1) and sometimes works.
>>
>
> What makes you think it fails?
It fails because when this data is being sent to the
RSA_private_decrypt() function it fails with a padding error.
>
>> When it fails it returns the length of a string, but a strlen() on the
>> 'to' variable is not equal to what RSA_public_encrypt() returns. I do
>> not know what the problem is, other than a memory problem. I first
>> thought the problem was in calling RSA_private_decrypt(); because it was
>> returning a packing error, but it turned out that the crypted data was
>> corrupt some how.
>>
>
> strlen() wont work on encrypted data since it can contain embedded
> nulls. In the case of RSA_public_encrypt() the size of the encrypted
> data is always RSA_size(key) as indicated in the manual.
>
> Steve.
The error only occurs when the strlen() and the return value of
RSA_pulic_encrypt() are not the same.
I am also curious as to functions to convert the encrypted data to/from
a text representation for storage.
Jason
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