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charopy
Beginner
80 Views

Problems running AES Rijndael-128 example code

Hi folks,

I got troubles running the AES example with Rijndael Functions.

When the example calls the decryption function... in this case 'ippsRijndael128DecryptCTR(ctext, rtext, sizeof(ptext), pCtx, crt, ctrNumBitSize);' it returns fewer bytes as spected compared with the original plain text buffer.

I made a function to dump the content of all buffers involved in the crypt/decrypt example, and I got this output:

// \\\\ Plain text before crypt ... // \\\\
========================================== DUMP len (0035) =======================================
HEXA Output:
71 75 69 63 6b 20 62 72 6f 77 6e 20 66 6f 78 20 6a 75 70 6d 20 6f 76 65 72 20 6c 61 7a 79 20 64 6f 67 00
ASCII Output:
quick brown fox jupm over lazy dog.
==================================================================================================
// \\\\ Cipher text after encrypt ... // \\\\
========================================== DUMP len (0035) =======================================
HEXA Output:
40 5d 2a 06 ab d4 40 00 71 f8 a3 e6 47 28 2b e2 c1 8f 4d 89 44 48 c1 4b 92 42 70 5d c6 3f 97 6e 05 00 00
ASCII Output:
@]*...@.q...G(+...M.DH.K.Bp].?.n...
==================================================================================================
// \\\\ Plain text before crypt ... // \\\\
========================================== DUMP len (0035) =======================================
HEXA Output:
71 75 69 63 6b 20 62 72 6f 77 6e 20 66 6f 78 20 6a 75 70 6d 20 6f 76 65 72 20 6c 61 7a 79 20 64 02 00 00
ASCII Output:
quick brown fox jupm over lazy d...
==================================================================================================

Last word sould be dog, and instead I got something else ...

Thanks in advance,

Chuck

P.D.: The example has been gotten from the ippcp reference manual
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2 Replies
PaulF_IntelCorp
Employee
80 Views

Hello Chuck,

Not sure if it will impact the results, but the sample you show above and the sample I found in the documentation are different on one line. Here's the sample in the current version of the on-line documentation:

http://software.intel.com/sites/products/documentation/hpc/ipp/ippcp/index.htm

This is the line in your code:

ippsRijndael128Init(key,IppsRijndaelKey256, pCtx);

and this is the line in the sample referenced above:

ippsRijndael128Init(key,IppsRijndaelKey128, pCtx);

which looks like a mistake in the key length input parameter.

Paul
charopy
Beginner
80 Views

You are right Paul. I've allready fixed it and got the same thing.

// \\ Plain text before crypt ... // \\
========================================== DUMP len (0035) =======================================
HEXA Output:
71 75 69 63 6b 20 62 72 6f 77 6e 20 66 6f 78 20 6a 75 70 6d 20 6f 76 65 72 20 6c 61 7a 79 20 64 6f 67 00
ASCII Output:
quick brown fox jupm over lazy dog.
==================================================================================================
// \\ Cipher text after encrypt ... // \\
========================================== DUMP len (0035) =======================================
HEXA Output:
f9 54 2a 89 0d 5f 6b 5c f4 ff 39 46 58 7e 84 ed e7 fe 38 c2 de 83 4d d8 6d 14 05 18 35 75 f7 de 05 00 00
ASCII Output:
.T*.._k\..9FX~....8...M.m...5u.....
==================================================================================================
// \\ Plain text before crypt ... // \\
========================================== DUMP len (0035) =======================================
HEXA Output:
71 75 69 63 6b 20 62 72 6f 77 6e 20 66 6f 78 20 6a 75 70 6d 20 6f 76 65 72 20 6c 61 7a 79 20 64 02 00 00
ASCII Output:
quick brown fox jupm over lazy d...
==================================================================================================

I attached the changed source code.

Regards,

Chuck
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