Problem - Kevin Tafuro

Table 5-3. Implementations for the SPC_ENCRYPT_INIT macro for each OpenSSL-supported
block cipher
Cipher OpenSSL-based SPC_ENCRYPT_INIT implementation
AES AES_set_encrypt_key(key, keybytes * 8, sched)
Blowfish BF_set_key(sched, keybytes, key)
CAST5 CAST_set_key(sched, keybytes, key)
DES DES_set_key_unchecked((DES_cblock *)key, sched)
3-key Triple-DES DES_set_key_unchecked((DES_cblock *)key, &sched->ks1); \
DES_set_key_unchecked((DES_cblock *)(key + 8), &sched->ks2); \
DES_set_key_unchecked((DES_cblock *)(key + 16), &sched->ks3);
2-key Triple-DES DES_set_key_unchecked((DES_cblock *)key, &sched->ks1); \
DES_set_key_unchecked((DES_cblock *)(key + 8), &sched->ks2);
IDEA idea_set_encrypt_key(key, sched);
RC2 RC2_set_key(sched, keybytes, key, keybytes * 8);
RC5 RC5_32_set_key(sched, keybytes, key, 12);
In most of the implementations in Table 5-3, SPC_DECRYPT_INIT will be the same as
SPC_ENCRYPT_INIT (you can define one to the other). The two exceptions are AES and
IDEA. For AES:
#define SPC_DECRYPT_INIT(sched, key, keybytes) \
AES_set_decrypt_key(key, keybytes * 8, sched)
For IDEA:
#define SPC_DECRYPT_INIT(sched, key, keybytes) { \
IDEA_KEY_SCHEDULE tmp;\
idea_set_encrypt_key(key, &tmp);\
idea_set_decrypt_key(&tmp, sched);\
}
Tables 5-4 and 5-5 provide implementations of the SPC_DO_ENCRYPT and SPC_DO_
DECRYPT macros.
Table 5-4. Implementations for the SPC_DO_ENCRYPT macro for each OpenSSL-supported
block cipher
Cipher OpenSSL-based SPC_DO_ENCRYPT implementation
AES AES_encrypt(in, out, sched)
Blowfish BF_ecb_encrypt(in, out, sched, 1)
CAST5 CAST_ecb_encrypt(in, out, sched, 1)
DES DES_ecb_encrypt(in, out, sched, 1)
3-key Triple-DES DES_ecb3_encrypt((DES_cblock *)in, (DES_cblock *)out, \
&sched->ks1, &sched->ks2, &sched->ks3, 1);
2-key Triple-DES DES_ecb3_encrypt((DES_cblock *)in, (DES_cblock *)out, \
&sched->ks1, &sched->ks2, &sched->ks1, 1);
174 | Chapter 5: Symmetric Encryption
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