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  SQL Server Tips by Burleson

Blowfish and TEA Block Cipher

Blowfish is a cipher designed by Bruce Schneier, intended for implementation on large microprocessors. It is a 64 bit block cipher and supports variable key lengths. The XP_CYYPT code uses a C++ class called “CBlowFish” provided by the authors of the cipher to implement support for this algorithm. The class only encrypts / decrypts data whose data is an even multiple of 8 bytes. The code handles this case by padding the incoming data to an even multiple of 8 bytes and putting the number of unused bytes in the last byte prior to encryption. These extra bytes are then removed during the encryption process. If we were using the MS CryptoAPI, we would not have to worry about these issues even when we are using block ciphers.

TEA Block Cipher

David Wheeler and Roger Needham at Cambridge University developed the Tiny Encryption Algorithm in 1994. It is 64-bit block cipher with a key size of 128 bits. As with the blowfish implementation, the XP_CRYPTOAPI implementation automatically handles the padding upon encryption and removal after decryption. The code to implement the algorithm is taken directly from the Cambridge University web site describing the algorithm. Please note that the implementation provided operates in ECB mode as opposed to CBC mode.

The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter  

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