Component: SkipJackM

From the NIST description of SkipJack.

Provided Interfaces

Variables

typedef struct SkipJackM.SJContext { uint8_t skey[32 * 4]; } SJContext
uint8_t F[256] = { 0xA3, 0xD7, 0x09, 0x83, 0xF8, 0x48, 0xF6, 0xF4, 0xB3, 0x21, 0x15, 0x78, 0x99, 0xB1, 0xAF, 0xF9, 0xE7, 0x2D, 0x4D, 0x8A, 0xCE, 0x4C, 0xCA, 0x2E, 0x52, 0x95, 0xD9, 0x1E, 0x4E, 0x38, 0x44, 0x28, 0x0A, 0xDF, 0x02, 0xA0, 0x17, 0xF1, 0x60, 0x68, 0x12, 0xB7, 0x7A, 0xC3, 0xE9, 0xFA, 0x3D, 0x53, 0x96, 0x84, 0x6B, 0xBA, 0xF2, 0x63, 0x9A, 0x19, 0x7C, 0xAE, 0xE5, 0xF5, 0xF7, 0x16, 0x6A, 0xA2, 0x39, 0xB6, 0x7B, 0x0F, 0xC1, 0x93, 0x81, 0x1B, 0xEE, 0xB4, 0x1A, 0xEA, 0xD0, 0x91, 0x2F, 0xB8, 0x55, 0xB9, 0xDA, 0x85, 0x3F, 0x41, 0xBF, 0xE0, 0x5A, 0x58, 0x80, 0x5F, 0x66, 0x0B, 0xD8, 0x90, 0x35, 0xD5, 0xC0, 0xA7, 0x33, 0x06, 0x65, 0x69, 0x45, 0x00, 0x94, 0x56, 0x6D, 0x98, 0x9B, 0x76, 0x97, 0xFC, 0xB2, 0xC2, 0xB0, 0xFE, 0xDB, 0x20, 0xE1, 0xEB, 0xD6, 0xE4, 0xDD, 0x47, 0x4A, 0x1D, 0x42, 0xED, 0x9E, 0x6E, 0x49, 0x3C, 0xCD, 0x43, 0x27, 0xD2, 0x07, 0xD4, 0xDE, 0xC7, 0x67, 0x18, 0x89, 0xCB, 0x30, 0x1F, 0x8D, 0xC6, 0x8F, 0xAA, 0xC8, 0x74, 0xDC, 0xC9, 0x5D, 0x5C, 0x31, 0xA4, 0x70, 0x88, 0x61, 0x2C, 0x9F, 0x0D, 0x2B, 0x87, 0x50, 0x82, 0x54, 0x64, 0x26, 0x7D, 0x03, 0x40, 0x34, 0x4B, 0x1C, 0x73, 0xD1, 0xC4, 0xFD, 0x3B, 0xCC, 0xFB, 0x7F, 0xAB, 0xE6, 0x3E, 0x5B, 0xA5, 0xAD, 0x04, 0x23, 0x9C, 0x14, 0x51, 0x22, 0xF0, 0x29, 0x79, 0x71, 0x7E, 0xFF, 0x8C, 0x0E, 0xE2, 0x0C, 0xEF, 0xBC, 0x72, 0x75, 0x6F, 0x37, 0xA1, 0xEC, 0xD3, 0x8E, 0x62, 0x8B, 0x86, 0x10, 0xE8, 0x08, 0x77, 0x11, 0xBE, 0x92, 0x4F, 0x24, 0xC5, 0x32, 0x36, 0x9D, 0xCF, 0xF3, 0xA6, 0xBB, 0xAC, 0x5E, 0x6C, 0xA9, 0x13, 0x57, 0x25, 0xB5, 0xE3, 0xBD, 0xA8, 0x3A, 0x01, 0x05, 0x59, 0x2A, 0x46 }
result_t setupKey(CipherContext *context, uint8_t *key, uint8_t keysize)
Performs the key expansion on the real secret.

Function Index

void dumpBuffer(char *bufName, uint8_t *buf, uint8_t size) Debug function
command result_t BlockCipher.init (CipherContext *context, uint8_t blockSize, uint8_t keySize, uint8_t *key) Initialize the BlockCipher context.
async command result_t BlockCipher.encrypt (CipherContext *context, uint8_t *plainBlock, uint8_t *cipherBlock) Encrypts a single block (of blockSize) using the key in the keySize.
async command result_t BlockCipher.decrypt (CipherContext *context, uint8_t *cipherBlock, uint8_t *plainBlock) Decrypts a single block (of blockSize) using the key in the keySize.
result_t setupKey (CipherContext *context, uint8_t *key, uint8_t keysize) Performs the key expansion on the real secret.
async command uint8_t BlockCipherInfo.getPreferredBlockSize (void) Returns the preferred block size that this cipher operates with.

Function Descriptions

BlockCipher.init

command result_t BlockCipher.init (CipherContext *context, uint8_t blockSize, uint8_t keySize, uint8_t *key)

Initialize the BlockCipher context.

Parameters:	context - structure to hold the opaque data from this initialization call. It should be passed to future invocations of this module which use this particular key. blockSize - size of the block in bytes. Some cipher implementation may support multiple block sizes, in which case any valid size is valid. keySize - key size in bytes key - pointer to the key
Returns:	Whether initialization was successful. The command may be unsuccessful if the key size or blockSize are not valid for the given cipher implementation.

BlockCipher.encrypt

async command result_t BlockCipher.encrypt (CipherContext *context, uint8_t *plainBlock, uint8_t *cipherBlock)

Encrypts a single block (of blockSize) using the key in the keySize.

Parameters:	context - holds the module specific opaque data related to the key (perhaps key expansions). plainBlock - a plaintext block of blockSize cipherBlock - the resulting ciphertext block of blockSize
Returns:	Whether the encryption was successful. Possible failure reasons include not calling init().

BlockCipher.decrypt

async command result_t BlockCipher.decrypt (CipherContext *context, uint8_t *cipherBlock, uint8_t *plainBlock)

Decrypts a single block (of blockSize) using the key in the keySize. Not all ciphers will implement this function (since providing encryption is a useful primitive).

Parameters:	context - holds the module specific opaque data related to the key (perhaps key expansions). cipherBlock - a ciphertext block of blockSize plainBlock - the resulting plaintext block of blockSize
Returns:	Whether the decryption was successful. Possible failure reasons include not calling init() or an unimplimented decrypt function.

setupKey

result_t setupKey(CipherContext *context, uint8_t *key, uint8_t keysize)

Performs the key expansion on the real secret.

Parameters:

secret - key

BlockCipherInfo.getPreferredBlockSize

async command uint8_t BlockCipherInfo.getPreferredBlockSize (void)

Returns the preferred block size that this cipher operates with. It is always safe to call this function before the init() call has been made.

Returns:

the preferred block size for this cipher. In the case where the cipher operates with multiple block sizes, this will pick one particular size (deterministically).