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Chapter 2 Algorithm Info Types 87
AI_FeedbackCipher
The RC2 algorithm methods, AM_RC2_ENCRYPT and AM_RC2_DECRYPT, require an
A_RC2_PARAMS structure:
The RC5 algorithm methods,
AM_RC5_ENCRYPT, AM_RC564_ENCRYPT, AM_RC5_DECRYPT,
and
AM_RC564_DECRYPT, require an A_RC5_PARAMS structure. Note that the 64-bit
versions of the RC5 algorithm,
AM_RC5_64_ENCRYPT and AM_RC5_64_DECRYPT, are
evaluation implementations and are not optimized in Crypto-C 4.3:
The RC6 algorithm methods,
AM_RC6_ENCRYPT and AM_RC6_DECRYPT, require an
Decryption
“des” AM_DES_DECRYPT;
null 8 bytes
“des_ede” AM_DES_EDE_DECRYPT;
null 24 bytes
“desx” AM_DESX_DECRYPT;
null 24 bytes
“rc2” AM_RC2_DECRYPT;
Pointer to an
A_RC2_PARAMS
structure
1 - 128 bytes
“rc5” AM_RC5_DECRYPT;
Pointer to an
A_RC5_PARAMS
structure
0 - 255 bytes;
32-bit word
“rc5_64” AM_RC5_64DECRYPT;
Pointer to an
A_RC5_PARAMS
structure
0 - 255 bytes;
64-bit word
"rc6"
AM_RC6_DECRYPT
;
Pointer to an
A_RC6_PARAMS
structure
typedef struct {
unsigned int effectiveKeyBits; /* effective key size in bits */
} A_RC2_PARAMS ;
typedef struct {
unsigned int version; / * currently version 1.0 -- defined as 0x10 */
unsigned int rounds; /* number of rounds (0 - 255) */
unsigned int wordSizeInBits; /* 32 for “rc5” or 64 for “rc5_64” */
} A_RC5_PARAMS;
Table 2-1 Algorithm methods for block ciphers
encryptionMethodName
Algorithm methods to
include in chooser Parameters Key Size