Thanks for the response Dr. Henson.
I had found this code at
http://books.google.com/books?id=dbocXYHcUAUC&pg=PA232&lpg=PA232&dq=evp_decryptfinal_ex&source=web&ots=y0dMb3Salh&sig=lLAYthDUIzbaAxMi0bBxJzyOGUg#PPA232,M1
, Page 232. I just changed the variables.
But it seems this book's code does not work.
So, should I do something like this -
int currentReadLength = 0;
int currentDataLength = 0;
datalength = 0;
printf("\n iNumChunks is %d\n", iNumChunks);
memset(pBuff,0,pOutLength * sizeof(unsigned char));
for(int i=0;i<iNumChunks;i++)
{
if(!EVP_EncryptUpdate(&ctx,&pBuff[currentDataLength],&datalength,&pData[currentReadLength],1024))
{
#ifdef SSDK_DEBUG
printf("\nEncrypt failed\n");
ERR_print_errors_fp(stdout);
#endif
EVP_CIPHER_CTX_cleanup(&ctx);
return CRYPTO_ENCRYPTION_ENGINE_FAILURE;
}
printf("\n currentLength is %d\n", currentDataLength);
printf("\n encrypt datalength 1 is %d\n", datalength);
fflush(stdout);
currentReadLength += 1024;
currentDataLength += datalength;
printf("\n currentLength is %d\n", currentDataLength);
}
......
thanks
> Date: Mon, 19 Nov 2007 21:52:35 +0100
> From: [EMAIL PROTECTED]
> To: [email protected]
> Subject: Re: Reposting: EVP_DecryptFinal_ex:bad decrypt
>
> On Mon, Nov 19, 2007, Pankaj Mathur wrote:
>
> >
> > I am still struggling with this issue.
> > I did not get much help from the list, so I am reposting again.
> >
> if(!EVP_EncryptUpdate(&ctx,&pBuff[currentLength],
> &datalength,
> &pData[currentLength],1024))
> ...
> currentLength += datalength;
>
> The above shows you are not using EVP_EncryptUpdate properly. It will consume
> all of the input buffer (1024 bytes in this example) and write datalength
> bytes to the output buffer.
>
> Your use of EVP_DecryptUpdate() has similar problems.
>
> Steve.
> --
> Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage
> OpenSSL project core developer and freelance consultant.
> Funding needed! Details on homepage.
> Homepage: http://www.drh-consultancy.demon.co.uk
> ______________________________________________________________________
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