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/**
* \file base64.h
*
* \brief RFC 1521 base64 encoding/decoding
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#ifndef MBEDTLS_BASE64_H
#define MBEDTLS_BASE64_H
#include "mbedtls/build_info.h"
#include <stddef.h>
/** Output buffer too small. */
#define MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL -0x002A
/** Invalid character in input. */
#define MBEDTLS_ERR_BASE64_INVALID_CHARACTER -0x002C
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Encode a buffer into base64 format
*
* \param dst destination buffer
* \param dlen size of the destination buffer
* \param olen number of bytes written
* \param src source buffer
* \param slen amount of data to be encoded
*
* \return 0 if successful, or MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL.
* *olen is always updated to reflect the amount
* of data that has (or would have) been written.
* If that length cannot be represented, then no data is
* written to the buffer and *olen is set to the maximum
* length representable as a size_t.
*
* \note Call this function with dlen = 0 to obtain the
* required buffer size in *olen
*/
int mbedtls_base64_encode(unsigned char *dst, size_t dlen, size_t *olen,
const unsigned char *src, size_t slen);
/**
* \brief Decode a base64-formatted buffer
*
* \param dst destination buffer (can be NULL for checking size)
* \param dlen size of the destination buffer
* \param olen number of bytes written
* \param src source buffer
* \param slen amount of data to be decoded
*
* \return 0 if successful, MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL, or
* MBEDTLS_ERR_BASE64_INVALID_CHARACTER if the input data is
* not correct. *olen is always updated to reflect the amount
* of data that has (or would have) been written.
*
* \note Call this function with *dst = NULL or dlen = 0 to obtain
* the required buffer size in *olen
*/
int mbedtls_base64_decode(unsigned char *dst, size_t dlen, size_t *olen,
const unsigned char *src, size_t slen);
#if defined(MBEDTLS_SELF_TEST)
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int mbedtls_base64_self_test(int verbose);
#endif /* MBEDTLS_SELF_TEST */
#ifdef __cplusplus
}
#endif
#endif /* base64.h */
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