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SIPHASH24(3) FreeBSD Library Functions Manual SIPHASH24(3) NAME SipHash24_Init, SipHash24_Update, SipHash24_End, SipHash24_Final, SipHash24 - calculate SipHash24 hashes SYNOPSIS #include <siphash.h> void SipHash24_Init(SIPHASH_CTX *ctx, const SIPHASH_KEY *key); void SipHash24_Update(SIPHASH_CTX *ctx, const void *data, size_t len); uint64_t SipHash24_End(SIPHASH_CTX *ctx); void SipHash24_Final(void *digest, SIPHASH_CTX *ctx); uint64_t SipHash24(const SIPHASH_KEY *key, const void *data, size_t len); DESCRIPTION The SipHash algorithm is a keyed hash algorithm optimised for short inputs which produces a 64-bit digest of data. The SipHash24 functions implement the algorithm with 2 compression rounds and 4 finalisation rounds. SipHash24_Init() initialises a SIPHASH_CTX context ctx with the secret key. SipHash24_Update() adds data of length len to the context ctx. SipHash24_End() is called after all data has been added to ctx via SipHash24_Update() and returns a message digest in the host's native endian. SipHash24_Final() is called after all data has been added to ctx via SipHash24_Update() and stores the message digest at the address specified by the digest parameter. The buffer at digest must be SIPHASH_DIGEST_LENGTH bytes long. SipHash24() calculates the digest of data of length len with the secret key. It is recommended that the SIPHASH_KEY key be generated with arc4random_buf(3). RETURN VALUES SipHash24_End() and SipHash24() return the 64-bit message digest in the host's native endian representation. SEE ALSO arc4random_buf(3) HISTORY These functions appeared in OpenBSD 5.7. FreeBSD 14.1-RELEASE-p8 August 30, 2019 FreeBSD 14.1-RELEASE-p8