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Diffstat (limited to 'include/mbedtls/chachapoly.h')
| -rw-r--r-- | include/mbedtls/chachapoly.h | 342 |
1 files changed, 0 insertions, 342 deletions
diff --git a/include/mbedtls/chachapoly.h b/include/mbedtls/chachapoly.h deleted file mode 100644 index 3dc21e3..0000000 --- a/include/mbedtls/chachapoly.h +++ /dev/null @@ -1,342 +0,0 @@ -/** - * \file chachapoly.h - * - * \brief This file contains the AEAD-ChaCha20-Poly1305 definitions and - * functions. - * - * ChaCha20-Poly1305 is an algorithm for Authenticated Encryption - * with Associated Data (AEAD) that can be used to encrypt and - * authenticate data. It is based on ChaCha20 and Poly1305 by Daniel - * Bernstein and was standardized in RFC 7539. - * - * \author Daniel King <damaki.gh@gmail.com> - */ - -/* - * Copyright The Mbed TLS Contributors - * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later - */ - -#ifndef MBEDTLS_CHACHAPOLY_H -#define MBEDTLS_CHACHAPOLY_H -#include "mbedtls/private_access.h" - -#include "mbedtls/build_info.h" - -/* for shared error codes */ -#include "mbedtls/poly1305.h" - -/** The requested operation is not permitted in the current state. */ -#define MBEDTLS_ERR_CHACHAPOLY_BAD_STATE -0x0054 -/** Authenticated decryption failed: data was not authentic. */ -#define MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED -0x0056 - -#ifdef __cplusplus -extern "C" { -#endif - -typedef enum { - MBEDTLS_CHACHAPOLY_ENCRYPT, /**< The mode value for performing encryption. */ - MBEDTLS_CHACHAPOLY_DECRYPT /**< The mode value for performing decryption. */ -} -mbedtls_chachapoly_mode_t; - -#if !defined(MBEDTLS_CHACHAPOLY_ALT) - -#include "mbedtls/chacha20.h" - -typedef struct mbedtls_chachapoly_context { - mbedtls_chacha20_context MBEDTLS_PRIVATE(chacha20_ctx); /**< The ChaCha20 context. */ - mbedtls_poly1305_context MBEDTLS_PRIVATE(poly1305_ctx); /**< The Poly1305 context. */ - uint64_t MBEDTLS_PRIVATE(aad_len); /**< The length (bytes) of the Additional Authenticated Data. */ - uint64_t MBEDTLS_PRIVATE(ciphertext_len); /**< The length (bytes) of the ciphertext. */ - int MBEDTLS_PRIVATE(state); /**< The current state of the context. */ - mbedtls_chachapoly_mode_t MBEDTLS_PRIVATE(mode); /**< Cipher mode (encrypt or decrypt). */ -} -mbedtls_chachapoly_context; - -#else /* !MBEDTLS_CHACHAPOLY_ALT */ -#include "chachapoly_alt.h" -#endif /* !MBEDTLS_CHACHAPOLY_ALT */ - -/** - * \brief This function initializes the specified ChaCha20-Poly1305 context. - * - * It must be the first API called before using - * the context. It must be followed by a call to - * \c mbedtls_chachapoly_setkey() before any operation can be - * done, and to \c mbedtls_chachapoly_free() once all - * operations with that context have been finished. - * - * In order to encrypt or decrypt full messages at once, for - * each message you should make a single call to - * \c mbedtls_chachapoly_crypt_and_tag() or - * \c mbedtls_chachapoly_auth_decrypt(). - * - * In order to encrypt messages piecewise, for each - * message you should make a call to - * \c mbedtls_chachapoly_starts(), then 0 or more calls to - * \c mbedtls_chachapoly_update_aad(), then 0 or more calls to - * \c mbedtls_chachapoly_update(), then one call to - * \c mbedtls_chachapoly_finish(). - * - * \warning Decryption with the piecewise API is discouraged! Always - * use \c mbedtls_chachapoly_auth_decrypt() when possible! - * - * If however this is not possible because the data is too - * large to fit in memory, you need to: - * - * - call \c mbedtls_chachapoly_starts() and (if needed) - * \c mbedtls_chachapoly_update_aad() as above, - * - call \c mbedtls_chachapoly_update() multiple times and - * ensure its output (the plaintext) is NOT used in any other - * way than placing it in temporary storage at this point, - * - call \c mbedtls_chachapoly_finish() to compute the - * authentication tag and compared it in constant time to the - * tag received with the ciphertext. - * - * If the tags are not equal, you must immediately discard - * all previous outputs of \c mbedtls_chachapoly_update(), - * otherwise you can now safely use the plaintext. - * - * \param ctx The ChachaPoly context to initialize. Must not be \c NULL. - */ -void mbedtls_chachapoly_init(mbedtls_chachapoly_context *ctx); - -/** - * \brief This function releases and clears the specified - * ChaCha20-Poly1305 context. - * - * \param ctx The ChachaPoly context to clear. This may be \c NULL, in which - * case this function is a no-op. - */ -void mbedtls_chachapoly_free(mbedtls_chachapoly_context *ctx); - -/** - * \brief This function sets the ChaCha20-Poly1305 - * symmetric encryption key. - * - * \param ctx The ChaCha20-Poly1305 context to which the key should be - * bound. This must be initialized. - * \param key The \c 256 Bit (\c 32 Bytes) key. - * - * \return \c 0 on success. - * \return A negative error code on failure. - */ -int mbedtls_chachapoly_setkey(mbedtls_chachapoly_context *ctx, - const unsigned char key[32]); - -/** - * \brief This function starts a ChaCha20-Poly1305 encryption or - * decryption operation. - * - * \warning You must never use the same nonce twice with the same key. - * This would void any confidentiality and authenticity - * guarantees for the messages encrypted with the same nonce - * and key. - * - * \note If the context is being used for AAD only (no data to - * encrypt or decrypt) then \p mode can be set to any value. - * - * \warning Decryption with the piecewise API is discouraged, see the - * warning on \c mbedtls_chachapoly_init(). - * - * \param ctx The ChaCha20-Poly1305 context. This must be initialized - * and bound to a key. - * \param nonce The nonce/IV to use for the message. - * This must be a readable buffer of length \c 12 Bytes. - * \param mode The operation to perform: #MBEDTLS_CHACHAPOLY_ENCRYPT or - * #MBEDTLS_CHACHAPOLY_DECRYPT (discouraged, see warning). - * - * \return \c 0 on success. - * \return A negative error code on failure. - */ -int mbedtls_chachapoly_starts(mbedtls_chachapoly_context *ctx, - const unsigned char nonce[12], - mbedtls_chachapoly_mode_t mode); - -/** - * \brief This function feeds additional data to be authenticated - * into an ongoing ChaCha20-Poly1305 operation. - * - * The Additional Authenticated Data (AAD), also called - * Associated Data (AD) is only authenticated but not - * encrypted nor included in the encrypted output. It is - * usually transmitted separately from the ciphertext or - * computed locally by each party. - * - * \note This function is called before data is encrypted/decrypted. - * I.e. call this function to process the AAD before calling - * \c mbedtls_chachapoly_update(). - * - * You may call this function multiple times to process - * an arbitrary amount of AAD. It is permitted to call - * this function 0 times, if no AAD is used. - * - * This function cannot be called any more if data has - * been processed by \c mbedtls_chachapoly_update(), - * or if the context has been finished. - * - * \warning Decryption with the piecewise API is discouraged, see the - * warning on \c mbedtls_chachapoly_init(). - * - * \param ctx The ChaCha20-Poly1305 context. This must be initialized - * and bound to a key. - * \param aad_len The length in Bytes of the AAD. The length has no - * restrictions. - * \param aad Buffer containing the AAD. - * This pointer can be \c NULL if `aad_len == 0`. - * - * \return \c 0 on success. - * \return #MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA - * if \p ctx or \p aad are NULL. - * \return #MBEDTLS_ERR_CHACHAPOLY_BAD_STATE - * if the operations has not been started or has been - * finished, or if the AAD has been finished. - */ -int mbedtls_chachapoly_update_aad(mbedtls_chachapoly_context *ctx, - const unsigned char *aad, - size_t aad_len); - -/** - * \brief Thus function feeds data to be encrypted or decrypted - * into an on-going ChaCha20-Poly1305 - * operation. - * - * The direction (encryption or decryption) depends on the - * mode that was given when calling - * \c mbedtls_chachapoly_starts(). - * - * You may call this function multiple times to process - * an arbitrary amount of data. It is permitted to call - * this function 0 times, if no data is to be encrypted - * or decrypted. - * - * \warning Decryption with the piecewise API is discouraged, see the - * warning on \c mbedtls_chachapoly_init(). - * - * \param ctx The ChaCha20-Poly1305 context to use. This must be initialized. - * \param len The length (in bytes) of the data to encrypt or decrypt. - * \param input The buffer containing the data to encrypt or decrypt. - * This pointer can be \c NULL if `len == 0`. - * \param output The buffer to where the encrypted or decrypted data is - * written. This must be able to hold \p len bytes. - * This pointer can be \c NULL if `len == 0`. - * - * \return \c 0 on success. - * \return #MBEDTLS_ERR_CHACHAPOLY_BAD_STATE - * if the operation has not been started or has been - * finished. - * \return Another negative error code on other kinds of failure. - */ -int mbedtls_chachapoly_update(mbedtls_chachapoly_context *ctx, - size_t len, - const unsigned char *input, - unsigned char *output); - -/** - * \brief This function finished the ChaCha20-Poly1305 operation and - * generates the MAC (authentication tag). - * - * \param ctx The ChaCha20-Poly1305 context to use. This must be initialized. - * \param mac The buffer to where the 128-bit (16 bytes) MAC is written. - * - * \warning Decryption with the piecewise API is discouraged, see the - * warning on \c mbedtls_chachapoly_init(). - * - * \return \c 0 on success. - * \return #MBEDTLS_ERR_CHACHAPOLY_BAD_STATE - * if the operation has not been started or has been - * finished. - * \return Another negative error code on other kinds of failure. - */ -int mbedtls_chachapoly_finish(mbedtls_chachapoly_context *ctx, - unsigned char mac[16]); - -/** - * \brief This function performs a complete ChaCha20-Poly1305 - * authenticated encryption with the previously-set key. - * - * \note Before using this function, you must set the key with - * \c mbedtls_chachapoly_setkey(). - * - * \warning You must never use the same nonce twice with the same key. - * This would void any confidentiality and authenticity - * guarantees for the messages encrypted with the same nonce - * and key. - * - * \param ctx The ChaCha20-Poly1305 context to use (holds the key). - * This must be initialized. - * \param length The length (in bytes) of the data to encrypt or decrypt. - * \param nonce The 96-bit (12 bytes) nonce/IV to use. - * \param aad The buffer containing the additional authenticated - * data (AAD). This pointer can be \c NULL if `aad_len == 0`. - * \param aad_len The length (in bytes) of the AAD data to process. - * \param input The buffer containing the data to encrypt or decrypt. - * This pointer can be \c NULL if `ilen == 0`. - * \param output The buffer to where the encrypted or decrypted data - * is written. This pointer can be \c NULL if `ilen == 0`. - * \param tag The buffer to where the computed 128-bit (16 bytes) MAC - * is written. This must not be \c NULL. - * - * \return \c 0 on success. - * \return A negative error code on failure. - */ -int mbedtls_chachapoly_encrypt_and_tag(mbedtls_chachapoly_context *ctx, - size_t length, - const unsigned char nonce[12], - const unsigned char *aad, - size_t aad_len, - const unsigned char *input, - unsigned char *output, - unsigned char tag[16]); - -/** - * \brief This function performs a complete ChaCha20-Poly1305 - * authenticated decryption with the previously-set key. - * - * \note Before using this function, you must set the key with - * \c mbedtls_chachapoly_setkey(). - * - * \param ctx The ChaCha20-Poly1305 context to use (holds the key). - * \param length The length (in Bytes) of the data to decrypt. - * \param nonce The \c 96 Bit (\c 12 bytes) nonce/IV to use. - * \param aad The buffer containing the additional authenticated data (AAD). - * This pointer can be \c NULL if `aad_len == 0`. - * \param aad_len The length (in bytes) of the AAD data to process. - * \param tag The buffer holding the authentication tag. - * This must be a readable buffer of length \c 16 Bytes. - * \param input The buffer containing the data to decrypt. - * This pointer can be \c NULL if `ilen == 0`. - * \param output The buffer to where the decrypted data is written. - * This pointer can be \c NULL if `ilen == 0`. - * - * \return \c 0 on success. - * \return #MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED - * if the data was not authentic. - * \return Another negative error code on other kinds of failure. - */ -int mbedtls_chachapoly_auth_decrypt(mbedtls_chachapoly_context *ctx, - size_t length, - const unsigned char nonce[12], - const unsigned char *aad, - size_t aad_len, - const unsigned char tag[16], - const unsigned char *input, - unsigned char *output); - -#if defined(MBEDTLS_SELF_TEST) -/** - * \brief The ChaCha20-Poly1305 checkup routine. - * - * \return \c 0 on success. - * \return \c 1 on failure. - */ -int mbedtls_chachapoly_self_test(int verbose); -#endif /* MBEDTLS_SELF_TEST */ - -#ifdef __cplusplus -} -#endif - -#endif /* MBEDTLS_CHACHAPOLY_H */ |