poly1305.h File Reference

This file contains Poly1305 definitions and functions. More...

#include "mbedtls/private_access.h"
#include "mbedtls/build_info.h"
#include <stdint.h>
#include <stddef.h>
#include "poly1305_alt.h"

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Macros
#define	MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA   -0x0057

Functions
void	mbedtls_poly1305_init (mbedtls_poly1305_context *ctx)
	This function initializes the specified Poly1305 context. More...
void	mbedtls_poly1305_free (mbedtls_poly1305_context *ctx)
	This function releases and clears the specified Poly1305 context. More...
int	mbedtls_poly1305_starts (mbedtls_poly1305_context *ctx, const unsigned char key[32])
	This function sets the one-time authentication key. More...
int	mbedtls_poly1305_update (mbedtls_poly1305_context *ctx, const unsigned char *input, size_t ilen)
	This functions feeds an input buffer into an ongoing Poly1305 computation. More...
int	mbedtls_poly1305_finish (mbedtls_poly1305_context *ctx, unsigned char mac[16])
	This function generates the Poly1305 Message Authentication Code (MAC). More...
int	mbedtls_poly1305_mac (const unsigned char key[32], const unsigned char *input, size_t ilen, unsigned char mac[16])
	This function calculates the Poly1305 MAC of the input buffer with the provided key. More...
int	mbedtls_poly1305_self_test (int verbose)
	The Poly1305 checkup routine. More...

Detailed Description

This file contains Poly1305 definitions and functions.

Poly1305 is a one-time message authenticator that can be used to authenticate messages. Poly1305-AES was created by Daniel Bernstein https://cr.yp.to/mac/poly1305-20050329.pdf The generic Poly1305 algorithm (not tied to AES) was also standardized in RFC 7539.

Author

Daniel King damak.nosp@m.i.gh.nosp@m.@gmai.nosp@m.l.co.nosp@m.m

Definition in file poly1305.h.

Macro Definition Documentation

#define MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA   -0x0057

Invalid input parameter(s).

Definition at line 42 of file poly1305.h.

Function Documentation

int mbedtls_poly1305_finish	(	mbedtls_poly1305_context *	ctx,
		unsigned char	mac[16]
	)

This function generates the Poly1305 Message Authentication Code (MAC).

Parameters

ctx	The Poly1305 context to use for the Poly1305 operation. This must be initialized and bound to a key.
mac	The buffer to where the MAC is written. This must be a writable buffer of length 16 Bytes.

Returns

0 on success.

A negative error code on failure.

void mbedtls_poly1305_free

(

mbedtls_poly1305_context *

ctx

)

This function releases and clears the specified Poly1305 context.

Parameters

ctx	The Poly1305 context to clear. This may be NULL, in which case this function is a no-op. If it is not NULL, it must point to an initialized Poly1305 context.

void mbedtls_poly1305_init

(

mbedtls_poly1305_context *

ctx

)

This function initializes the specified Poly1305 context.

It must be the first API called before using the context.

It is usually followed by a call to mbedtls_poly1305_starts(), then one or more calls to mbedtls_poly1305_update(), then one call to mbedtls_poly1305_finish(), then finally mbedtls_poly1305_free().

Parameters

ctx	The Poly1305 context to initialize. This must not be NULL.

int mbedtls_poly1305_mac	(	const unsigned char	key[32],
		const unsigned char *	input,
		size_t	ilen,
		unsigned char	mac[16]
	)

This function calculates the Poly1305 MAC of the input buffer with the provided key.

Warning

The key must be unique and unpredictable for each invocation of Poly1305.

Parameters

key	The buffer containing the 32 Byte (256 Bit) key.
ilen	The length of the input data in Bytes. Any value is accepted.
input	The buffer holding the input data. This pointer can be NULL if ilen == 0.
mac	The buffer to where the MAC is written. This must be a writable buffer of length 16 Bytes.

Returns

0 on success.

A negative error code on failure.

int mbedtls_poly1305_self_test

(

int

verbose

)

The Poly1305 checkup routine.

Returns

0 on success.

1 on failure.

int mbedtls_poly1305_starts	(	mbedtls_poly1305_context *	ctx,
		const unsigned char	key[32]
	)

This function sets the one-time authentication key.

Warning

The key must be unique and unpredictable for each invocation of Poly1305.

Parameters

ctx	The Poly1305 context to which the key should be bound. This must be initialized.
key	The buffer containing the 32 Byte (256 Bit) key.

Returns

0 on success.

A negative error code on failure.

int mbedtls_poly1305_update	(	mbedtls_poly1305_context *	ctx,
		const unsigned char *	input,
		size_t	ilen
	)

This functions feeds an input buffer into an ongoing Poly1305 computation.

It is called between mbedtls_cipher_poly1305_starts() and mbedtls_cipher_poly1305_finish(). It can be called repeatedly to process a stream of data.

Parameters

ctx	The Poly1305 context to use for the Poly1305 operation. This must be initialized and bound to a key.
ilen	The length of the input data in Bytes. Any value is accepted.
input	The buffer holding the input data. This pointer can be NULL if ilen == 0.

Returns

0 on success.

A negative error code on failure.