int wc_InitSipHash(    SipHash * siphash,    const unsigned char * key,    unsigned char outSz)

• wc_SipHash
• wc_SipHashUpdate
• wc_SipHashFinal

Return:

• 0 Returned upon successfully initializing
• BAD_FUNC_ARG Returned when siphash or key is NULL
• BAD_FUNC_ARG Returned when outSz is neither 8 nor 16

Example

SipHash siphash[1];unsigned char key[16] = { ... };byte macSz = 8; // 8 or 16if ((ret = wc_InitSipHash(siphash, key, macSz)) != 0) {    WOLFSSL_MSG("wc_InitSipHash failed");}else if ((ret = wc_SipHashUpdate(siphash, data, len)) != 0) {    WOLFSSL_MSG("wc_SipHashUpdate failed");}else if ((ret = wc_SipHashFinal(siphash, mac, macSz)) != 0) {    WOLFSSL_MSG("wc_SipHashFinal failed");}

function wc_SipHashUpdate

int wc_SipHashUpdate(    SipHash * siphash,    const unsigned char * in,    word32 inSz)

Can be called to continually hash the provided byte array of length len.

Parameters:

• siphash pointer to the SipHash structure to use for MACing
• in the data to be MACed
• inSz size of data to be MACed

See:

• wc_SipHash
• wc_InitSipHash
• wc_SipHashFinal

Return:

• 0 Returned upon successfully adding the data to the MAC
• BAD_FUNC_ARG Returned when siphash is NULL
• BAD_FUNC_ARG Returned when in is NULL and inSz is not zero

Example

SipHash siphash[1];byte data[] = { Data to be MACed };word32 len = sizeof(data);if ((ret = wc_InitSipHash(siphash, key, macSz)) != 0) {    WOLFSSL_MSG("wc_InitSipHash failed");}else if ((ret = wc_SipHashUpdate(siphash, data, len)) != 0) {    WOLFSSL_MSG("wc_SipHashUpdate failed");}else if ((ret = wc_SipHashFinal(siphash, mac, macSz)) != 0) {    WOLFSSL_MSG("wc_SipHashFinal failed");}

function wc_SipHashFinal

int wc_SipHashFinal(    SipHash * siphash,    unsigned char * out,    unsigned char outSz)

Finalizes MACing of data. Result is placed into out.

Parameters:

• siphash pointer to the SipHash structure to use for MACing
• out Byte array to hold MAC value
• outSz number of bytes to output as MAC

See:

• wc_SipHash
• wc_InitSipHash
• wc_SipHashUpdate

Return:

• 0 Returned upon successfully finalizing.
• BAD_FUNC_ARG Returned when siphash of out is NULL
• BAD_FUNC_ARG Returned when outSz is not the same as the initialized value

Example

SipHash siphash[1];byte mac[8] = { ... }; // 8 or 16 bytesbyte macSz = sizeof(mac);if ((ret = wc_InitSipHash(siphash, key, macSz)) != 0) {    WOLFSSL_MSG("wc_InitSipHash failed");}else if ((ret = wc_SipHashUpdate(siphash, data, len)) != 0) {    WOLFSSL_MSG("wc_SipHashUpdate failed");}else if ((ret = wc_SipHashFinal(siphash, mac, macSz)) != 0) {    WOLFSSL_MSG("wc_SipHashFinal failed");}

function wc_SipHash

int wc_SipHash(    const unsigned char * key,    const unsigned char * in,    word32 inSz,    unsigned char * out,    unsigned char outSz)

This function one-shots the data using SipHash to calculate a MAC based on the key.

Parameters:

• key pointer to the 16-byte array
• in the data to be MACed
• inSz size of data to be MACed
• out Byte array to hold MAC value
• outSz number of bytes to output as MAC

See:

• wc_InitSipHash
• wc_SipHashUpdate
• wc_SipHashFinal

Return:

• 0 Returned upon successfully MACing
• BAD_FUNC_ARG Returned when key or out is NULL
• BAD_FUNC_ARG Returned when in is NULL and inSz is not zero
• BAD_FUNC_ARG Returned when outSz is neither 8 nor 16

Example

unsigned char key[16] = { ... };byte data[] = { Data to be MACed };word32 len = sizeof(data);byte mac[8] = { ... }; // 8 or 16 bytesbyte macSz = sizeof(mac);if ((ret = wc_SipHash(key, data, len, mac, macSz)) != 0) {    WOLFSSL_MSG("wc_SipHash failed");}

Source code

int wc_InitSipHash(SipHash* siphash, const unsigned char* key,    unsigned char outSz);int wc_SipHashUpdate(SipHash* siphash, const unsigned char* in,    word32 inSz);int wc_SipHashFinal(SipHash* siphash, unsigned char* out,    unsigned char outSz);int wc_SipHash(const unsigned char* key, const unsigned char* in,    word32 inSz, unsigned char* out, unsigned char outSz);

Updated on 2026-02-20 at 02:00:33 +0000