Incremental SipHash in C

Incremental SipHash in C

Incremental, public domain, portable C implementation of SipHash, a keyed hash function. It has a minimalist interface and makes no allocations. It defines no extraneous macros or functions, making it perfect for embedding and amalgamation.

void     siphash_init(struct siphash *, const void *key);
void     siphash_update(struct siphash *, const void *, size_t);
uint64_t siphash_final(const struct siphash *);

void     siphash_init128(struct siphash *, const void *key);
void     siphash_final128(const struct siphash *, void *digest);

In Go style, finalization function does not modify the context, allowing more input to be appended after the digest is computed. To clone the context, copy it.

For a non-incremental, header library of SipHash: siphash.h.