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55 lines
1.8 KiB
55 lines
1.8 KiB
4 years ago
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#ifndef _KHASH_H
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#define _KHASH_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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/// No salt
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#define KHASH_SALT_TYPE_NONE ((uint8_t)0)
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/// The default static salt
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#define KHASH_SALT_TYPE_DEFAULT ((uint8_t)1)
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/// A specific salt passed as `data` to `khash_new_salt`.
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#define KHASH_SALT_TYPE_SPECIFIC ((uint8_t)2)
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/// A randomly generated salt.
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#define KHASH_SALT_TYPE_RANDOM ((uint8_t)3)
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/// A valid salt for khash functions. Initialised with `khash_new_salt`.
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typedef struct {
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uint8_t salt_type;
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uint32_t size;
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uint8_t* body;
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} khash_salt;
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/// Returned by all functions that succeed.
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#define KHASH_SUCCESS ((int32_t)0)
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/// Reading into the hash failed
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#define KHASH_ERROR_IO ((int32_t)1)
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/// Formatting the has failed
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#define KHASH_ERROR_FORMAT ((int32_t)2)
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/// Bad hash length
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#define KHASH_ERROR_LENGTH ((int32_t)3)
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/// Random number generation failed
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#define KHASH_ERROR_RNG ((int32_t)4)
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/// Unknown error
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#define KHASH_ERROR_UNKNOWN ((int32_t)-1)
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/// Create a new salt. `salt_type` is expected to be one of the above defined `KHASH_SALT_TYPE_*` macros.
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/// Depending on the type, `data` may be `NULL`.
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extern int32_t khash_new_salt(uint8_t salt_type, const void* data, size_t size, khash_salt* output);
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/// Free a salt allocated with `khash_new_salt`. It is okay to call this multiple times.
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extern int32_t khash_free_salt(khash_salt* salt);
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/// Compute the length of hash required for the specified input.
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extern int32_t khash_length(const void* data, size_t size, const khash_salt* salt, size_t* length);
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/// Compute the hash and store it in `string`. Will write no more than `strlen` bytes into `string`.
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extern int32_t khash_do(const void* data, size_t size, khash_salt* salt, char* string, size_t strlen);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _KHASH_H */
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