Re: Question about ctr mode 3des-ede IV len

2016-12-08 Thread Longpeng (Mike) 
Hi Jussi,

On 2016/12/7 21:15, Jussi Kivilinna wrote:

> Hello,
> 
> 07.12.2016, 14:43, Longpeng (Mike) kirjoitti:
>> Hi Jussi and Herbert,
>>
>> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and 
>> the
>> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
>>
>> Would you please tell me why these testcases has 16-bytes IV ?
> 
> Because I used same tool to create test-vectors which I had previously used 
> to create AES/Camellia/Serpent/Twofish test-vectors. So, I must have 
> forgotten to change 16-byte IV generation to 8 bytes and thus those testcases 
> in crypto/testmgr.h have wrong length. The extra trailing 8 bytes are not 
> used and can be removed.
> 


Thank you very much. :)

> -Jussi
> 
>>
>> Thank you. :)
>>
> 
> .
> 


-- 
Regards,
Longpeng(Mike)

Re: Question about ctr mode 3des-ede IV len

2016-12-08 Thread Longpeng (Mike) 
Hi Jussi,

On 2016/12/7 21:15, Jussi Kivilinna wrote:

> Hello,
> 
> 07.12.2016, 14:43, Longpeng (Mike) kirjoitti:
>> Hi Jussi and Herbert,
>>
>> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and 
>> the
>> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
>>
>> Would you please tell me why these testcases has 16-bytes IV ?
> 
> Because I used same tool to create test-vectors which I had previously used 
> to create AES/Camellia/Serpent/Twofish test-vectors. So, I must have 
> forgotten to change 16-byte IV generation to 8 bytes and thus those testcases 
> in crypto/testmgr.h have wrong length. The extra trailing 8 bytes are not 
> used and can be removed.
> 


Thank you very much. :)

> -Jussi
> 
>>
>> Thank you. :)
>>
> 
> .
> 


-- 
Regards,
Longpeng(Mike)

Re: Question about ctr mode 3des-ede IV len

2016-12-08 Thread Jussi Kivilinna 
Hello,

07.12.2016, 14:43, Longpeng (Mike) kirjoitti:
> Hi Jussi and Herbert,
> 
> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and 
> the
> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
> 
> Would you please tell me why these testcases has 16-bytes IV ?

Because I used same tool to create test-vectors which I had previously used to 
create AES/Camellia/Serpent/Twofish test-vectors. So, I must have forgotten to 
change 16-byte IV generation to 8 bytes and thus those testcases in 
crypto/testmgr.h have wrong length. The extra trailing 8 bytes are not used and 
can be removed.

-Jussi

> 
> Thank you. :)
>

Re: Question about ctr mode 3des-ede IV len

2016-12-08 Thread Jussi Kivilinna 
Hello,

07.12.2016, 14:43, Longpeng (Mike) kirjoitti:
> Hi Jussi and Herbert,
> 
> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and 
> the
> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
> 
> Would you please tell me why these testcases has 16-bytes IV ?

Because I used same tool to create test-vectors which I had previously used to 
create AES/Camellia/Serpent/Twofish test-vectors. So, I must have forgotten to 
change 16-byte IV generation to 8 bytes and thus those testcases in 
crypto/testmgr.h have wrong length. The extra trailing 8 bytes are not used and 
can be removed.

-Jussi

> 
> Thank you. :)
>

Re: Question about ctr mode 3des-ede IV len

2016-12-08 Thread Longpeng (Mike) 


On 2016/12/8 17:04, Herbert Xu wrote:

> On Wed, Dec 07, 2016 at 08:43:16PM +0800, Longpeng (Mike) wrote:
>> Hi Jussi and Herbert,
>>
>> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and 
>> the
>> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
>>
>> Would you please tell me why these testcases has 16-bytes IV ?
> 
> I think they were automatically generated.  Only the first eight
> bytes are actually used so the IV size is still 8.
> 
> Cheers,


Cool, thank you very much! :)

-- 
Regards,
Longpeng(Mike)

Re: Question about ctr mode 3des-ede IV len

2016-12-08 Thread Longpeng (Mike) 


On 2016/12/8 17:04, Herbert Xu wrote:

> On Wed, Dec 07, 2016 at 08:43:16PM +0800, Longpeng (Mike) wrote:
>> Hi Jussi and Herbert,
>>
>> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and 
>> the
>> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
>>
>> Would you please tell me why these testcases has 16-bytes IV ?
> 
> I think they were automatically generated.  Only the first eight
> bytes are actually used so the IV size is still 8.
> 
> Cheers,


Cool, thank you very much! :)

-- 
Regards,
Longpeng(Mike)

Re: Question about ctr mode 3des-ede IV len

2016-12-08 Thread Herbert Xu 
On Wed, Dec 07, 2016 at 08:43:16PM +0800, Longpeng (Mike) wrote:
> Hi Jussi and Herbert,
> 
> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and 
> the
> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
> 
> Would you please tell me why these testcases has 16-bytes IV ?

I think they were automatically generated.  Only the first eight
bytes are actually used so the IV size is still 8.

Cheers,
-- 
Email: Herbert Xu 
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Re: Question about ctr mode 3des-ede IV len

2016-12-08 Thread Herbert Xu 
On Wed, Dec 07, 2016 at 08:43:16PM +0800, Longpeng (Mike) wrote:
> Hi Jussi and Herbert,
> 
> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and 
> the
> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
> 
> Would you please tell me why these testcases has 16-bytes IV ?

I think they were automatically generated.  Only the first eight
bytes are actually used so the IV size is still 8.

Cheers,
-- 
Email: Herbert Xu 
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt