Thanks for the comment. I am searching on the net to find a sample to start. Do
you know any sample to start working with EVP_* interfaces for elliptic curve?
Thanks
________________________________
From: Erwann Abalea <erwann.aba...@keynectis.com>
To: openssl-users@openssl.org
Cc: Mohammad khodaei <m_khod...@yahoo.com>
Sent: Monday, August 6, 2012 3:42 PM
Subject: Re: [openssl-users] ECDSA sign/verify input data size
Use the EVP_* interface for high-level functions.
Use ECDSA_do_sign() or other low-level functions if you're
absolutely sure about what you're doing.
--
Erwann ABALEA
Le 06/08/2012 14:31, Mohammad khodaei a écrit :
Yes, it's correct.
>
>
>Now I try to feed the ECDSA_do_sign with the output buffer of SHA256. Based on
>my security knowledge, I thought that the signing algorithms perform hashing
>internally, while in this case it is not true.
>
>
>Thanks for the response.
>
>
>
>
>
>________________________________
> From: Erwann Abalea <erwann.aba...@keynectis.com>
>To: openssl-users@openssl.org
>Cc: Mohammad Khodaei <m_khod...@yahoo.com>
>Sent: Monday, August 6, 2012 2:14 PM
>Subject: Re: [openssl-users] ECDSA sign/verify input data size
>
>Bonjour,
>
>Which part of the examples did you mimic?
>32 bytes is the length of a SHA256, it's also the max
message length of a 256bits ECDSA key. Whence, I assume
you're doing straight ECDSA_do_sign() without hashing and
padding the message.
>
>-- Erwann ABALEA
>-----
>paléogallicisme: style "vieille France"
>
>Le 06/08/2012 13:11, Mohammad Khodaei a écrit :
>> Hello,
>>
>> I have used ECDSA APIs to sign and verify some data.
The sample example I have used to do so is like this:
>>
>>
http://old.nabble.com/Bug-in-ECDSA_do_sign--td1071562.html
>>
>> Now, the problem is that it seems there is some kind of
limitations on the input data size. Whenever I want to
verify the signature on a string, it calculates the
signature verification only on the first 32 characters and
it skips the rest of the string. It is a bit strange for me
since I feed the function with correct length.
>>
>> Any idea where is my mistakes?
>>
>> Thanks a lot
>
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