Problem - Kevin Tafuro

Table 5-4. Implementations for the SPC_DO_ENCRYPT macro for each OpenSSL-supported
block cipher (continued)
Cipher OpenSSL-based SPC_DO_ENCRYPT implementation
IDEA idea_ecb_encrypt(in, out, sched);
RC2 RC2_ecb_encrypt(in, out, sched, 1);
RC5 RC5_32_ecb_encrypt(in, out, sched, 1);
Table 5-5. Implementations for the SPC_DO_DECRYPT macro for each OpenSSL-supported
block cipher
Cipher OpenSSL-based SPC_DO_DECRYPT implementation
AES AES_decrypt(in, out, sched)
Blowfish BF_ecb_encrypt(in, out, sched, 0)
CAST5 CAST_ecb_encrypt(in, out, sched, 0)
DES DES_ecb_encrypt(in, out, sched, 0)
3-key Triple-DES DES_ecb3_encrypt((DES_cblock *)in, (DES_cblock *)out, \
&sched->ks1, &sched->ks2, &sched->ks3, 0);
2-key Triple-DES DES_ecb3_encrypt((DES_cblock *)in, (DES_cblock *)out, \
&sched->ks1, &sched->ks2, &sched->ks1, 0);
IDEA idea_ecb_encrypt(in, out, sched);
RC2 RC2_ecb_encrypt(in, out, sched, 0);
RC5 RC5_32_ecb_encrypt(in, out, sched, 0);
See Also
• Brian Gladman’s AES page: http://fp.gladman.plus.com/AES/
• OpenSSL home page: http://www.openssl.org/
• Recipes 5.4, 5.26, 5.27.
5.6 Using a Generic CBC Mode Implementation
Problem
You want a more high-level interface for CBC mode than your library provides.
Alternatively, you want a portable CBC interface, or you have only a block cipher
implementation and you would like to use CBC mode.
Solution
CBC mode XORs each plaintext block with the previous output block before
encrypting. The first block is XOR’d with the IV. Many libraries provide a CBC
Using a Generic CBC Mode Implementation | 175
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