Fletcher16

Fletcher16 checksum algorithm More...

Detailed Description

Fletcher16 checksum algorithm

Files
file	fletcher16.h

Data Structures
struct	fletcher16_ctx_t
	Fletcher's 16 bit checksum context struct. More...

Functions
uint16_t	fletcher16 (const uint8_t *buf, size_t bytes)
	Fletcher's 16 bit checksum .
void	fletcher16_init (fletcher16_ctx_t *ctx)
	Initialize a fletcher16 context.
void	fletcher16_update (fletcher16_ctx_t *ctx, const uint8_t *data, size_t len)
	Update the fletcher16 context with new data.
uint16_t	fletcher16_finish (fletcher16_ctx_t *ctx)
	Finalize the checksum operation and return the checksum.

Function Documentation

fletcher16()

uint16_t fletcher16	(	const uint8_t *	buf,
		size_t	bytes )

Fletcher's 16 bit checksum .

found on http://en.wikipedia.org/w/index.php?title=Fletcher%27s_checksum&oldid=661273016#Optimizations

Note

the returned sum is never 0

Parameters

buf	input buffer to hash
bytes	length of buffer, in bytes

Returns

16 bit sized hash in the interval [1..65535]

fletcher16_finish()

uint16_t fletcher16_finish

(

fletcher16_ctx_t *

ctx

)

Finalize the checksum operation and return the checksum.

Parameters

[in]

ctx

fletcher16 context

Returns

Checksum of the data

fletcher16_init()

void fletcher16_init

(

fletcher16_ctx_t *

ctx

)

Initialize a fletcher16 context.

Multi-part version of fletcher16_full.

Parameters

[in]

ctx

fletcher16 context to initialize

fletcher16_update()

void fletcher16_update	(	fletcher16_ctx_t *	ctx,
		const uint8_t *	data,
		size_t	len )

Update the fletcher16 context with new data.

Parameters

[in]	ctx	fletcher16 context
[in]	data	Data to add to the context
[in]	len	Length of the data