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POdecryption of block cipher?
 

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  1. POdecryption of block cipher?
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    <p>Hi i have encrypted a data of size 196,662 bytes, using block cipher method AES-128 of mode electronic code book (ecb), and now the encrypted data size became 196,672 bytes. And now I have to decrypt, since the data size i have to decrypt is a multiple of 16, I tried decrypting the encrypted data at a single stretch without dividing it, but its not decrypting. Tell me if i want to change anything in my encryption and decryption method or else tell me any other equivalent solution. Thanks in advance.</p> <p>Edit: Encryption code:</p> <pre><code>bufferlen = filesize; buffer = new BYTE [ bufferlen ]; feof = false; do { count = fread(buffer, 1, 16, filepointer); if ( count &lt; 16 ) { feof = true; } cout &lt;&lt; count; result = CryptEncrypt(hGenKey,NULL,feof,0,buffer,&amp;count,bufferlen); if ( result == 0 ) { cout &lt;&lt; "\nencrypt failed"; } else { cout &lt;&lt; "encrypt passed"; } if(fwrite(buffer, 1, count , filepointer1)!=count) { cout &lt;&lt; "\nwrite failed"; } } while (feof != true); </code></pre> <p>Decryption code:</p> <pre><code>bufferlen = filesize; buffer = new BYTE [ bufferlen ]; feof = false; do { count = fread(buffer, 1, 16, filepointer); if ( count &lt; 16 ) { feof = true; } cout &lt;&lt; count; result = CryptEncrypt(hGenKey,NULL,feof,0,buffer,&amp;count,bufferlen); if ( result == 0 ) { cout &lt;&lt; "\nencrypt failed"; } else { cout &lt;&lt; "encrypt passed"; } if(fwrite(buffer, 1, count , filepointer1)!=count) { cout &lt;&lt; "\nwrite failed"; } } while ( feof != true ); </code></pre>
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    1. COI would imagine showing us your algorithms might make it easier to comment on changes
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    2. COENCRYPTION: bufferlen = filesize; buffer = new BYTE [ bufferlen ]; feof = false; do { count = fread(buffer, 1, 16, filepointer); if ( count < 16 ) { feof = true; } cout << count; result = CryptEncrypt(hGenKey,NULL,feof,0,buffer,&count,bufferlen); if ( result == 0 ) { cout << "\nencrypt failed"; } else { cout << "encrypt passed"; } if(fwrite(buffer, 1, count , filepointer1)!=count) { cout << "\nwrite failed"; } } while ( feof != true ); DECRYPTION : decryption i made the above same coding instead, i kept bufferlen = filesize..
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    3. COYou have to use [CryptDecrypt](http://msdn.microsoft.com/en-us/library/aa379913) to decrypt.
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