193 lines
6.9 KiB
C
193 lines
6.9 KiB
C
/**
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* \file poly1305.h
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*
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* \brief This file contains Poly1305 definitions and functions.
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*
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* Poly1305 is a one-time message authenticator that can be used to
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* authenticate messages. Poly1305-AES was created by Daniel
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* Bernstein https://cr.yp.to/mac/poly1305-20050329.pdf The generic
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* Poly1305 algorithm (not tied to AES) was also standardized in RFC
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* 7539.
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*
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* \author Daniel King <damaki.gh@gmail.com>
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*/
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/* Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of Mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_POLY1305_H
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#define MBEDTLS_POLY1305_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stdint.h>
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#include <stddef.h>
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#define MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA -0x0057 /**< Invalid input parameter(s). */
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/* MBEDTLS_ERR_POLY1305_FEATURE_UNAVAILABLE is deprecated and should not be
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* used. */
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#define MBEDTLS_ERR_POLY1305_FEATURE_UNAVAILABLE -0x0059 /**< Feature not available. For example, s part of the API is not implemented. */
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/* MBEDTLS_ERR_POLY1305_HW_ACCEL_FAILED is deprecated and should not be used.
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*/
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#define MBEDTLS_ERR_POLY1305_HW_ACCEL_FAILED -0x005B /**< Poly1305 hardware accelerator failed. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(MBEDTLS_POLY1305_ALT)
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typedef struct mbedtls_poly1305_context
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{
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uint32_t r[4]; /** The value for 'r' (low 128 bits of the key). */
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uint32_t s[4]; /** The value for 's' (high 128 bits of the key). */
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uint32_t acc[5]; /** The accumulator number. */
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uint8_t queue[16]; /** The current partial block of data. */
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size_t queue_len; /** The number of bytes stored in 'queue'. */
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}
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mbedtls_poly1305_context;
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#else /* MBEDTLS_POLY1305_ALT */
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#include "poly1305_alt.h"
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#endif /* MBEDTLS_POLY1305_ALT */
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/**
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* \brief This function initializes the specified Poly1305 context.
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*
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* It must be the first API called before using
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* the context.
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*
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* It is usually followed by a call to
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* \c mbedtls_poly1305_starts(), then one or more calls to
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* \c mbedtls_poly1305_update(), then one call to
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* \c mbedtls_poly1305_finish(), then finally
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* \c mbedtls_poly1305_free().
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*
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* \param ctx The Poly1305 context to initialize. This must
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* not be \c NULL.
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*/
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void mbedtls_poly1305_init( mbedtls_poly1305_context *ctx );
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/**
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* \brief This function releases and clears the specified
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* Poly1305 context.
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*
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* \param ctx The Poly1305 context to clear. This may be \c NULL, in which
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* case this function is a no-op. If it is not \c NULL, it must
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* point to an initialized Poly1305 context.
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*/
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void mbedtls_poly1305_free( mbedtls_poly1305_context *ctx );
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/**
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* \brief This function sets the one-time authentication key.
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*
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* \warning The key must be unique and unpredictable for each
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* invocation of Poly1305.
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*
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* \param ctx The Poly1305 context to which the key should be bound.
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* This must be initialized.
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* \param key The buffer containing the \c 32 Byte (\c 256 Bit) key.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_poly1305_starts( mbedtls_poly1305_context *ctx,
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const unsigned char key[32] );
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/**
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* \brief This functions feeds an input buffer into an ongoing
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* Poly1305 computation.
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*
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* It is called between \c mbedtls_cipher_poly1305_starts() and
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* \c mbedtls_cipher_poly1305_finish().
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* It can be called repeatedly to process a stream of data.
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*
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* \param ctx The Poly1305 context to use for the Poly1305 operation.
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* This must be initialized and bound to a key.
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* \param ilen The length of the input data in Bytes.
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* Any value is accepted.
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* \param input The buffer holding the input data.
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* This pointer can be \c NULL if `ilen == 0`.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_poly1305_update( mbedtls_poly1305_context *ctx,
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const unsigned char *input,
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size_t ilen );
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/**
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* \brief This function generates the Poly1305 Message
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* Authentication Code (MAC).
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*
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* \param ctx The Poly1305 context to use for the Poly1305 operation.
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* This must be initialized and bound to a key.
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* \param mac The buffer to where the MAC is written. This must
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* be a writable buffer of length \c 16 Bytes.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_poly1305_finish( mbedtls_poly1305_context *ctx,
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unsigned char mac[16] );
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/**
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* \brief This function calculates the Poly1305 MAC of the input
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* buffer with the provided key.
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*
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* \warning The key must be unique and unpredictable for each
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* invocation of Poly1305.
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*
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* \param key The buffer containing the \c 32 Byte (\c 256 Bit) key.
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* \param ilen The length of the input data in Bytes.
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* Any value is accepted.
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* \param input The buffer holding the input data.
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* This pointer can be \c NULL if `ilen == 0`.
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* \param mac The buffer to where the MAC is written. This must be
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* a writable buffer of length \c 16 Bytes.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_poly1305_mac( const unsigned char key[32],
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const unsigned char *input,
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size_t ilen,
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unsigned char mac[16] );
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#if defined(MBEDTLS_SELF_TEST)
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/**
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* \brief The Poly1305 checkup routine.
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*
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* \return \c 0 on success.
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* \return \c 1 on failure.
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*/
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int mbedtls_poly1305_self_test( int verbose );
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#endif /* MBEDTLS_SELF_TEST */
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_POLY1305_H */
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