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579f17cfee
Imported c-siphash code with command: git subtree add --prefix shared/c-siphash/ git@github.com:c-util/c-siphash.git master --squash To update the library use: git subtree pull --prefix shared/c-siphash/ git@github.com:c-util/c-siphash.git master --squash
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
#pragma once
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/**
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* Streaming-capable SipHash Implementation
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*
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* This library provides a SipHash API, that is fully implemented in ISO-C11
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* and has no external dependencies. The library performs no memory allocation,
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* and provides a streaming API where data to be hashed can be appended
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* piecemeal.
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*
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* A streaming-capable hash state is represented by the "CSipHash" structure,
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* which should be initialized with a unique seed before use. If streaming
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* capabilities are not required, c_siphash_hash() provides a simple one-shot
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* API.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h>
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#include <stdint.h>
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typedef struct CSipHash CSipHash;
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/**
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* struct CSipHash - SipHash state object
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* @v0-@v3: internal state
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* @padding: pending bytes that were not a multiple of 8
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* @n_bytes: number of hashed bytes
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*
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* The state of an inflight hash is represenetd by a CSipHash object. Before
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* hashing, it must be initialized with c_siphash_init(), providing a unique
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* random hash seed. Data is hashed by appending it to the state object, using
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* c_siphash_append(). Finally, the hash is read out by calling
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* c_siphash_finalize().
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*
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* This state object has no allocated resources. It is safe to release its
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* backing memory without any further action.
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*/
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struct CSipHash {
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uint64_t v0;
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uint64_t v1;
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uint64_t v2;
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uint64_t v3;
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uint64_t padding;
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size_t n_bytes;
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};
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#define C_SIPHASH_NULL {}
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void c_siphash_init(CSipHash *state, const uint8_t seed[16]);
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void c_siphash_append(CSipHash *state, const uint8_t *bytes, size_t n_bytes);
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uint64_t c_siphash_finalize(CSipHash *state);
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uint64_t c_siphash_hash(const uint8_t seed[16], const uint8_t *bytes, size_t n_bytes);
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#ifdef __cplusplus
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}
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#endif
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