After doing this I could encrypt / decrypt upto 7 KB only. The code fails after 7 KB. Please help.
thanks From: [EMAIL PROTECTED] To: openssl-users@openssl.org Subject: RE: Reposting: EVP_DecryptFinal_ex:bad decrypt Date: Wed, 21 Nov 2007 01:32:12 +0000 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: openssl-users@openssl.org > 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 > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager [EMAIL PROTECTED] Fly HYD-BLR for Rs.499 Log on to MakeMyTrip! Check it out! _________________________________________________________________ Post ads for free - to sell, rent or even buy.www.yello.in http://ss1.richmedia.in/recurl.asp?pid=186
