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Edit File : apr_crypto.h \| Size : 19.68 KB
/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. / #ifndef APR_CRYPTO_H #define APR_CRYPTO_H #include "apu.h" #include "apr_pools.h" #include "apr_tables.h" #include "apr_hash.h" #include "apu_errno.h" #ifdef __cplusplus extern "C" { #endif /* * @file apr_crypto.h * @brief APR-UTIL Crypto library / /* * @defgroup APR_Util_Crypto Crypto routines * @ingroup APR_Util * @{ / #if APU_HAVE_CRYPTO #ifndef APU_CRYPTO_RECOMMENDED_DRIVER #if APU_HAVE_COMMONCRYPTO #define APU_CRYPTO_RECOMMENDED_DRIVER "commoncrypto" #else #if APU_HAVE_OPENSSL #define APU_CRYPTO_RECOMMENDED_DRIVER "openssl" #else #if APU_HAVE_NSS #define APU_CRYPTO_RECOMMENDED_DRIVER "nss" #else #if APU_HAVE_MSCNG #define APU_CRYPTO_RECOMMENDED_DRIVER "mscng" #else #if APU_HAVE_MSCAPI #define APU_CRYPTO_RECOMMENDED_DRIVER "mscapi" #else #endif #endif #endif #endif #endif #endif /* * Symmetric Key types understood by the library. * * NOTE: It is expected that this list will grow over time. * * Interoperability Matrix: * * The matrix is based on the testcrypto.c unit test, which attempts to * test whether a simple encrypt/decrypt will succeed, as well as testing * whether an encrypted string by one library can be decrypted by the * others. * * Some libraries will successfully encrypt and decrypt their own data, * but won't decrypt data from another library. It is hoped that over * time these anomalies will be found and fixed, but until then it is * recommended that ciphers are chosen that interoperate across platform. * * An X below means the test passes, it does not necessarily mean that * encryption performed is correct or secure. Applications should stick * to ciphers that pass the interoperablity tests on the right hand side * of the table. * * Aligned data is data whose length is a multiple of the block size for * the chosen cipher. Padded data is data that is not aligned by block * size and must be padded by the crypto library. * * OpenSSL CommonCrypto NSS Interop * Align Pad Align Pad Align Pad Align Pad * 3DES_192/CBC X X X X X X X X * 3DES_192/ECB X X X X * AES_256/CBC X X X X X X X X * AES_256/ECB X X X X X X * AES_192/CBC X X X X X X * AES_192/ECB X X X X X * AES_128/CBC X X X X X X * AES_128/ECB X X X X X * * Conclusion: for padded data, use 3DES_192/CBC or AES_256/CBC. For * aligned data, use 3DES_192/CBC, AES_256/CBC or AES_256/ECB. / typedef enum { APR_KEY_NONE, APR_KEY_3DES_192, /* 192 bit (3-Key) 3DES / APR_KEY_AES_128, /* 128 bit AES / APR_KEY_AES_192, /* 192 bit AES / APR_KEY_AES_256 /* 256 bit AES / } apr_crypto_block_key_type_e; typedef enum { APR_MODE_NONE, /* An error condition / APR_MODE_ECB, /* Electronic Code Book / APR_MODE_CBC /* Cipher Block Chaining / } apr_crypto_block_key_mode_e; / These are opaque structs. Instantiation is up to each backend / typedef struct apr_crypto_driver_t apr_crypto_driver_t; typedef struct apr_crypto_t apr_crypto_t; typedef struct apr_crypto_config_t apr_crypto_config_t; typedef struct apr_crypto_key_t apr_crypto_key_t; typedef struct apr_crypto_block_t apr_crypto_block_t; typedef struct apr_crypto_block_key_type_t { apr_crypto_block_key_type_e type; int keysize; int blocksize; int ivsize; } apr_crypto_block_key_type_t; typedef struct apr_crypto_block_key_mode_t { apr_crypto_block_key_mode_e mode; } apr_crypto_block_key_mode_t; typedef struct apr_crypto_passphrase_t { const char pass; apr_size_t passLen; const unsigned char * salt; apr_size_t saltLen; int iterations; } apr_crypto_passphrase_t; typedef struct apr_crypto_secret_t { const unsigned char secret; apr_size_t secretLen; } apr_crypto_secret_t; typedef enum { /* Key is derived from a passphrase / APR_CRYPTO_KTYPE_PASSPHRASE = 1, /* Key is derived from a raw key / APR_CRYPTO_KTYPE_SECRET = 2, } apr_crypto_key_type; typedef struct apr_crypto_key_rec_t { apr_crypto_key_type ktype; apr_crypto_block_key_type_e type; apr_crypto_block_key_mode_e mode; int pad; union { apr_crypto_passphrase_t passphrase; apr_crypto_secret_t secret; } k; } apr_crypto_key_rec_t; /* * @brief Perform once-only initialisation. Call once only. * * @param pool - pool to register any shutdown cleanups, etc * @return APR_NOTIMPL in case of no crypto support. / APU_DECLARE(apr_status_t) apr_crypto_init(apr_pool_t pool); /** * @brief Zero out the buffer provided when the pool is cleaned up. * * @param pool - pool to register the cleanup * @param buffer - buffer to zero out * @param size - size of the buffer to zero out / APU_DECLARE(apr_status_t) apr_crypto_clear(apr_pool_t pool, void buffer, apr_size_t size); /* * @brief Always zero out the buffer provided, without being optimized out by * the compiler. * * @param buffer - buffer to zero out * @param size - size of the buffer to zero out / APU_DECLARE(apr_status_t) apr_crypto_memzero(void buffer, apr_size_t size); /** * @brief Timing attacks safe buffers comparison, where the executing time does * not depend on the bytes compared but solely on the number of bytes. * * @param buf1 - first buffer to compare * @param buf2 - second buffer to compare * @param size - size of the buffers to compare * @return 1 if the buffers are equals, 0 otherwise. / APU_DECLARE(int) apr_crypto_equals(const void buf1, const void buf2, apr_size_t size); /* * @brief Get the driver struct for a name * * @param driver - pointer to driver struct. * @param name - driver name * @param params - array of initialisation parameters * @param result - result and error message on failure * @param pool - (process) pool to register cleanup * @return APR_SUCCESS for success * @return APR_ENOTIMPL for no driver (when DSO not enabled) * @return APR_EDSOOPEN if DSO driver file can't be opened * @return APR_ESYMNOTFOUND if the driver file doesn't contain a driver * @remarks NSS: the params can have "dir", "key3", "cert7" and "secmod" * keys, each followed by an equal sign and a value. Such key/value pairs can * be delimited by space or tab. If the value contains a space, surround the * whole key value pair in quotes: "dir=My Directory". * @remarks OpenSSL: currently no params are supported. / APU_DECLARE(apr_status_t) apr_crypto_get_driver( const apr_crypto_driver_t driver, const char name, const char params, const apu_err_t result, apr_pool_t pool); /** * @brief Return the name of the driver. * * @param driver - The driver in use. * @return The name of the driver. / APU_DECLARE(const char ) apr_crypto_driver_name( const apr_crypto_driver_t driver); /* * @brief Get the result of the last operation on a context. If the result * is NULL, the operation was successful. * @param result - the result structure * @param f - context pointer * @return APR_SUCCESS for success / APU_DECLARE(apr_status_t) apr_crypto_error(const apu_err_t result, const apr_crypto_t f); /** * @brief Create a context for supporting encryption. Keys, certificates, * algorithms and other parameters will be set per context. More than * one context can be created at one time. A cleanup will be automatically * registered with the given pool to guarantee a graceful shutdown. * @param f - context pointer will be written here * @param driver - driver to use * @param params - array of key parameters * @param pool - process pool * @return APR_ENOENGINE when the engine specified does not exist. APR_EINITENGINE * if the engine cannot be initialised. * @remarks NSS: currently no params are supported. * @remarks OpenSSL: the params can have "engine" as a key, followed by an equal * sign and a value. / APU_DECLARE(apr_status_t) apr_crypto_make(apr_crypto_t f, const apr_crypto_driver_t driver, const char params, apr_pool_t pool); /** * @brief Get a hash table of key types, keyed by the name of the type against * a pointer to apr_crypto_block_key_type_t, which in turn begins with an * integer. * * @param types - hashtable of key types keyed to constants. * @param f - encryption context * @return APR_SUCCESS for success / APU_DECLARE(apr_status_t) apr_crypto_get_block_key_types(apr_hash_t types, const apr_crypto_t f); /** * @brief Get a hash table of key modes, keyed by the name of the mode against * a pointer to apr_crypto_block_key_mode_t, which in turn begins with an * integer. * * @param modes - hashtable of key modes keyed to constants. * @param f - encryption context * @return APR_SUCCESS for success / APU_DECLARE(apr_status_t) apr_crypto_get_block_key_modes(apr_hash_t modes, const apr_crypto_t f); /** * @brief Create a key from the provided secret or passphrase. The key is cleaned * up when the context is cleaned, and may be reused with multiple encryption * or decryption operations. * @note If key is NULL, a apr_crypto_key_t will be created from a pool. If key is not NULL, key must point at a previously created structure. * @param key The key returned, see note. * @param rec The key record, from which the key will be derived. * @param f The context to use. * @param p The pool to use. * @return Returns APR_ENOKEY if the pass phrase is missing or empty, or if a backend * error occurred while generating the key. APR_ENOCIPHER if the type or mode * is not supported by the particular backend. APR_EKEYTYPE if the key type is * not known. APR_EPADDING if padding was requested but is not supported. * APR_ENOTIMPL if not implemented. / APU_DECLARE(apr_status_t) apr_crypto_key(apr_crypto_key_t key, const apr_crypto_key_rec_t rec, const apr_crypto_t f, apr_pool_t p); /** * @brief Create a key from the given passphrase. By default, the PBKDF2 * algorithm is used to generate the key from the passphrase. It is expected * that the same pass phrase will generate the same key, regardless of the * backend crypto platform used. The key is cleaned up when the context * is cleaned, and may be reused with multiple encryption or decryption * operations. * @note If key is NULL, a apr_crypto_key_t will be created from a pool. If key is not NULL, key must point at a previously created structure. * @param key The key returned, see note. * @param ivSize The size of the initialisation vector will be returned, based * on whether an IV is relevant for this type of crypto. * @param pass The passphrase to use. * @param passLen The passphrase length in bytes * @param salt The salt to use. * @param saltLen The salt length in bytes * @param type 3DES_192, AES_128, AES_192, AES_256. * @param mode Electronic Code Book / Cipher Block Chaining. * @param doPad Pad if necessary. * @param iterations Number of iterations to use in algorithm * @param f The context to use. * @param p The pool to use. * @return Returns APR_ENOKEY if the pass phrase is missing or empty, or if a backend * error occurred while generating the key. APR_ENOCIPHER if the type or mode * is not supported by the particular backend. APR_EKEYTYPE if the key type is * not known. APR_EPADDING if padding was requested but is not supported. * APR_ENOTIMPL if not implemented. * @deprecated Replaced by apr_crypto_key(). / APU_DECLARE(apr_status_t) apr_crypto_passphrase(apr_crypto_key_t key, apr_size_t ivSize, const char pass, apr_size_t passLen, const unsigned char salt, apr_size_t saltLen, const apr_crypto_block_key_type_e type, const apr_crypto_block_key_mode_e mode, const int doPad, const int iterations, const apr_crypto_t f, apr_pool_t p); /** * @brief Initialise a context for encrypting arbitrary data using the given key. * @note If ctx is NULL, a apr_crypto_block_t will be created from a pool. If ctx is not NULL, ctx must point at a previously created structure. * @param ctx The block context returned, see note. * @param iv Optional initialisation vector. If the buffer pointed to is NULL, * an IV will be created at random, in space allocated from the pool. * If the buffer pointed to is not NULL, the IV in the buffer will be * used. * @param key The key structure to use. * @param blockSize The block size of the cipher. * @param p The pool to use. * @return Returns APR_ENOIV if an initialisation vector is required but not specified. * Returns APR_EINIT if the backend failed to initialise the context. Returns * APR_ENOTIMPL if not implemented. / APU_DECLARE(apr_status_t) apr_crypto_block_encrypt_init( apr_crypto_block_t ctx, const unsigned char iv, const apr_crypto_key_t key, apr_size_t blockSize, apr_pool_t p); /** * @brief Encrypt data provided by in, write it to out. * @note The number of bytes written will be written to outlen. If * out is NULL, outlen will contain the maximum size of the * buffer needed to hold the data, including any data * generated by apr_crypto_block_encrypt_finish below. If out points to NULL, a buffer sufficiently large will be created from * the pool provided. If out points to a not-NULL value, this value will be used as a buffer instead. * @param out Address of a buffer to which data will be written, * see note. * @param outlen Length of the output will be written here. * @param in Address of the buffer to read. * @param inlen Length of the buffer to read. * @param ctx The block context to use. * @return APR_ECRYPT if an error occurred. Returns APR_ENOTIMPL if * not implemented. / APU_DECLARE(apr_status_t) apr_crypto_block_encrypt(unsigned char out, apr_size_t outlen, const unsigned char in, apr_size_t inlen, apr_crypto_block_t ctx); /** * @brief Encrypt final data block, write it to out. * @note If necessary the final block will be written out after being * padded. Typically the final block will be written to the * same buffer used by apr_crypto_block_encrypt, offset by the * number of bytes returned as actually written by the * apr_crypto_block_encrypt() call. After this call, the context * is cleaned and can be reused by apr_crypto_block_encrypt_init(). * @param out Address of a buffer to which data will be written. This * buffer must already exist, and is usually the same * buffer used by apr_evp_crypt(). See note. * @param outlen Length of the output will be written here. * @param ctx The block context to use. * @return APR_ECRYPT if an error occurred. * @return APR_EPADDING if padding was enabled and the block was incorrectly * formatted. * @return APR_ENOTIMPL if not implemented. / APU_DECLARE(apr_status_t) apr_crypto_block_encrypt_finish(unsigned char out, apr_size_t outlen, apr_crypto_block_t ctx); /** * @brief Initialise a context for decrypting arbitrary data using the given key. * @note If ctx is NULL, a apr_crypto_block_t will be created from a pool. If ctx is not NULL, ctx must point at a previously created structure. * @param ctx The block context returned, see note. * @param blockSize The block size of the cipher. * @param iv Optional initialisation vector. * @param key The key structure to use. * @param p The pool to use. * @return Returns APR_ENOIV if an initialisation vector is required but not specified. * Returns APR_EINIT if the backend failed to initialise the context. Returns * APR_ENOTIMPL if not implemented. / APU_DECLARE(apr_status_t) apr_crypto_block_decrypt_init( apr_crypto_block_t ctx, apr_size_t blockSize, const unsigned char iv, const apr_crypto_key_t key, apr_pool_t p); /* * @brief Decrypt data provided by in, write it to out. * @note The number of bytes written will be written to outlen. If * out is NULL, outlen will contain the maximum size of the * buffer needed to hold the data, including any data * generated by apr_crypto_block_decrypt_finish below. If out points to NULL, a buffer sufficiently large will be created from * the pool provided. If out points to a not-NULL value, this value will be used as a buffer instead. * @param out Address of a buffer to which data will be written, * see note. * @param outlen Length of the output will be written here. * @param in Address of the buffer to read. * @param inlen Length of the buffer to read. * @param ctx The block context to use. * @return APR_ECRYPT if an error occurred. Returns APR_ENOTIMPL if * not implemented. / APU_DECLARE(apr_status_t) apr_crypto_block_decrypt(unsigned char out, apr_size_t outlen, const unsigned char in, apr_size_t inlen, apr_crypto_block_t ctx); /** * @brief Decrypt final data block, write it to out. * @note If necessary the final block will be written out after being * padded. Typically the final block will be written to the * same buffer used by apr_crypto_block_decrypt, offset by the * number of bytes returned as actually written by the * apr_crypto_block_decrypt() call. After this call, the context * is cleaned and can be reused by apr_crypto_block_decrypt_init(). * @param out Address of a buffer to which data will be written. This * buffer must already exist, and is usually the same * buffer used by apr_evp_crypt(). See note. * @param outlen Length of the output will be written here. * @param ctx The block context to use. * @return APR_ECRYPT if an error occurred. * @return APR_EPADDING if padding was enabled and the block was incorrectly * formatted. * @return APR_ENOTIMPL if not implemented. / APU_DECLARE(apr_status_t) apr_crypto_block_decrypt_finish(unsigned char out, apr_size_t outlen, apr_crypto_block_t ctx); /** * @brief Clean encryption / decryption context. * @note After cleanup, a context is free to be reused if necessary. * @param ctx The block context to use. * @return Returns APR_ENOTIMPL if not supported. / APU_DECLARE(apr_status_t) apr_crypto_block_cleanup(apr_crypto_block_t ctx); /** * @brief Clean encryption / decryption context. * @note After cleanup, a context is free to be reused if necessary. * @param f The context to use. * @return Returns APR_ENOTIMPL if not supported. / APU_DECLARE(apr_status_t) apr_crypto_cleanup(apr_crypto_t f); /** * @brief Shutdown the crypto library. * @note After shutdown, it is expected that the init function can be called again. * @param driver - driver to use * @return Returns APR_ENOTIMPL if not supported. / APU_DECLARE(apr_status_t) apr_crypto_shutdown( const apr_crypto_driver_t driver); #endif /* APU_HAVE_CRYPTO / /* @} */ #ifdef __cplusplus } #endif #endif Back

Edit File : apr_crypto.h | Size : 19.68 KB

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef APR_CRYPTO_H
#define APR_CRYPTO_H

#include "apu.h"
#include "apr_pools.h"
#include "apr_tables.h"
#include "apr_hash.h"
#include "apu_errno.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @file apr_crypto.h
 * @brief APR-UTIL Crypto library
 */
/**
 * @defgroup APR_Util_Crypto Crypto routines
 * @ingroup APR_Util
 * @{
 */

#if APU_HAVE_CRYPTO

#ifndef APU_CRYPTO_RECOMMENDED_DRIVER
#if APU_HAVE_COMMONCRYPTO
#define APU_CRYPTO_RECOMMENDED_DRIVER "commoncrypto"
#else
#if APU_HAVE_OPENSSL
#define APU_CRYPTO_RECOMMENDED_DRIVER "openssl"
#else
#if APU_HAVE_NSS
#define APU_CRYPTO_RECOMMENDED_DRIVER "nss"
#else
#if APU_HAVE_MSCNG
#define APU_CRYPTO_RECOMMENDED_DRIVER "mscng"
#else
#if APU_HAVE_MSCAPI
#define APU_CRYPTO_RECOMMENDED_DRIVER "mscapi"
#else
#endif
#endif
#endif
#endif
#endif
#endif

/**
 * Symmetric Key types understood by the library.
 *
 * NOTE: It is expected that this list will grow over time.
 *
 * Interoperability Matrix:
 *
 * The matrix is based on the testcrypto.c unit test, which attempts to
 * test whether a simple encrypt/decrypt will succeed, as well as testing
 * whether an encrypted string by one library can be decrypted by the
 * others.
 *
 * Some libraries will successfully encrypt and decrypt their own data,
 * but won't decrypt data from another library. It is hoped that over
 * time these anomalies will be found and fixed, but until then it is
 * recommended that ciphers are chosen that interoperate across platform.
 *
 * An X below means the test passes, it does not necessarily mean that
 * encryption performed is correct or secure. Applications should stick
 * to ciphers that pass the interoperablity tests on the right hand side
 * of the table.
 *
 * Aligned data is data whose length is a multiple of the block size for
 * the chosen cipher. Padded data is data that is not aligned by block
 * size and must be padded by the crypto library.
 *
 *                  OpenSSL    CommonCrypto   NSS       Interop
 *                 Align  Pad  Align  Pad  Align  Pad  Align  Pad
 * 3DES_192/CBC    X      X    X      X    X      X    X      X
 * 3DES_192/ECB    X      X    X      X
 * AES_256/CBC     X      X    X      X    X      X    X      X
 * AES_256/ECB     X      X    X      X    X           X
 * AES_192/CBC     X      X    X      X    X      X
 * AES_192/ECB     X      X    X      X    X
 * AES_128/CBC     X      X    X      X    X      X
 * AES_128/ECB     X      X    X      X    X
 *
 * Conclusion: for padded data, use 3DES_192/CBC or AES_256/CBC. For
 * aligned data, use 3DES_192/CBC, AES_256/CBC or AES_256/ECB.
 */

typedef enum
{
    APR_KEY_NONE, APR_KEY_3DES_192, /** 192 bit (3-Key) 3DES */
    APR_KEY_AES_128, /** 128 bit AES */
    APR_KEY_AES_192, /** 192 bit AES */
    APR_KEY_AES_256
/** 256 bit AES */
} apr_crypto_block_key_type_e;

typedef enum
{
    APR_MODE_NONE, /** An error condition */
    APR_MODE_ECB, /** Electronic Code Book */
    APR_MODE_CBC
/** Cipher Block Chaining */
} apr_crypto_block_key_mode_e;

/* These are opaque structs.  Instantiation is up to each backend */
typedef struct apr_crypto_driver_t apr_crypto_driver_t;
typedef struct apr_crypto_t apr_crypto_t;
typedef struct apr_crypto_config_t apr_crypto_config_t;
typedef struct apr_crypto_key_t apr_crypto_key_t;
typedef struct apr_crypto_block_t apr_crypto_block_t;

typedef struct apr_crypto_block_key_type_t {
    apr_crypto_block_key_type_e type;
    int keysize;
    int blocksize;
    int ivsize;
} apr_crypto_block_key_type_t;

typedef struct apr_crypto_block_key_mode_t {
    apr_crypto_block_key_mode_e mode;
} apr_crypto_block_key_mode_t;

typedef struct apr_crypto_passphrase_t {
    const char *pass;
    apr_size_t passLen;
    const unsigned char * salt;
    apr_size_t saltLen;
    int iterations;
} apr_crypto_passphrase_t;

typedef struct apr_crypto_secret_t {
    const unsigned char *secret;
    apr_size_t secretLen;
} apr_crypto_secret_t;

typedef enum {
    /** Key is derived from a passphrase */
    APR_CRYPTO_KTYPE_PASSPHRASE     = 1,
    /** Key is derived from a raw key */
    APR_CRYPTO_KTYPE_SECRET     = 2,
} apr_crypto_key_type;

typedef struct apr_crypto_key_rec_t {
    apr_crypto_key_type ktype;
    apr_crypto_block_key_type_e type;
    apr_crypto_block_key_mode_e mode;
    int pad;
    union {
        apr_crypto_passphrase_t passphrase;
        apr_crypto_secret_t secret;
    } k;
} apr_crypto_key_rec_t;

/**
 * @brief Perform once-only initialisation. Call once only.
 *
 * @param pool - pool to register any shutdown cleanups, etc
 * @return APR_NOTIMPL in case of no crypto support.
 */
APU_DECLARE(apr_status_t) apr_crypto_init(apr_pool_t *pool);

/**
 * @brief Zero out the buffer provided when the pool is cleaned up.
 *
 * @param pool - pool to register the cleanup
 * @param buffer - buffer to zero out
 * @param size - size of the buffer to zero out
 */
APU_DECLARE(apr_status_t) apr_crypto_clear(apr_pool_t *pool, void *buffer,
        apr_size_t size);

/**
 * @brief Always zero out the buffer provided, without being optimized out by
 * the compiler.
 *
 * @param buffer - buffer to zero out
 * @param size - size of the buffer to zero out
 */
APU_DECLARE(apr_status_t) apr_crypto_memzero(void *buffer, apr_size_t size);

/**
 * @brief Timing attacks safe buffers comparison, where the executing time does
 * not depend on the bytes compared but solely on the number of bytes.
 *
 * @param buf1 - first buffer to compare
 * @param buf2 - second buffer to compare
 * @param size - size of the buffers to compare
 * @return 1 if the buffers are equals, 0 otherwise.
 */
APU_DECLARE(int) apr_crypto_equals(const void *buf1, const void *buf2,
                                   apr_size_t size);

/**
 * @brief Get the driver struct for a name
 *
 * @param driver - pointer to driver struct.
 * @param name - driver name
 * @param params - array of initialisation parameters
 * @param result - result and error message on failure
 * @param pool - (process) pool to register cleanup
 * @return APR_SUCCESS for success
 * @return APR_ENOTIMPL for no driver (when DSO not enabled)
 * @return APR_EDSOOPEN if DSO driver file can't be opened
 * @return APR_ESYMNOTFOUND if the driver file doesn't contain a driver
 * @remarks NSS: the params can have "dir", "key3", "cert7" and "secmod"
 *  keys, each followed by an equal sign and a value. Such key/value pairs can
 *  be delimited by space or tab. If the value contains a space, surround the
 *  whole key value pair in quotes: "dir=My Directory".
 * @remarks OpenSSL: currently no params are supported.
 */
APU_DECLARE(apr_status_t) apr_crypto_get_driver(
        const apr_crypto_driver_t **driver,
        const char *name, const char *params, const apu_err_t **result,
        apr_pool_t *pool);

/**
 * @brief Return the name of the driver.
 *
 * @param driver - The driver in use.
 * @return The name of the driver.
 */
APU_DECLARE(const char *) apr_crypto_driver_name(
        const apr_crypto_driver_t *driver);

/**
 * @brief Get the result of the last operation on a context. If the result
 *        is NULL, the operation was successful.
 * @param result - the result structure
 * @param f - context pointer
 * @return APR_SUCCESS for success
 */
APU_DECLARE(apr_status_t) apr_crypto_error(const apu_err_t **result,
        const apr_crypto_t *f);

/**
 * @brief Create a context for supporting encryption. Keys, certificates,
 *        algorithms and other parameters will be set per context. More than
 *        one context can be created at one time. A cleanup will be automatically
 *        registered with the given pool to guarantee a graceful shutdown.
 * @param f - context pointer will be written here
 * @param driver - driver to use
 * @param params - array of key parameters
 * @param pool - process pool
 * @return APR_ENOENGINE when the engine specified does not exist. APR_EINITENGINE
 * if the engine cannot be initialised.
 * @remarks NSS: currently no params are supported.
 * @remarks OpenSSL: the params can have "engine" as a key, followed by an equal
 *  sign and a value.
 */
APU_DECLARE(apr_status_t) apr_crypto_make(apr_crypto_t **f,
        const apr_crypto_driver_t *driver, const char *params,
        apr_pool_t *pool);

/**
 * @brief Get a hash table of key types, keyed by the name of the type against
 * a pointer to apr_crypto_block_key_type_t, which in turn begins with an
 * integer.
 *
 * @param types - hashtable of key types keyed to constants.
 * @param f - encryption context
 * @return APR_SUCCESS for success
 */
APU_DECLARE(apr_status_t) apr_crypto_get_block_key_types(apr_hash_t **types,
        const apr_crypto_t *f);

/**
 * @brief Get a hash table of key modes, keyed by the name of the mode against
 * a pointer to apr_crypto_block_key_mode_t, which in turn begins with an
 * integer.
 *
 * @param modes - hashtable of key modes keyed to constants.
 * @param f - encryption context
 * @return APR_SUCCESS for success
 */
APU_DECLARE(apr_status_t) apr_crypto_get_block_key_modes(apr_hash_t **modes,
        const apr_crypto_t *f);

/**
 * @brief Create a key from the provided secret or passphrase. The key is cleaned
 *        up when the context is cleaned, and may be reused with multiple encryption
 *        or decryption operations.
 * @note If *key is NULL, a apr_crypto_key_t will be created from a pool. If
 *       *key is not NULL, *key must point at a previously created structure.
 * @param key The key returned, see note.
 * @param rec The key record, from which the key will be derived.
 * @param f The context to use.
 * @param p The pool to use.
 * @return Returns APR_ENOKEY if the pass phrase is missing or empty, or if a backend
 *         error occurred while generating the key. APR_ENOCIPHER if the type or mode
 *         is not supported by the particular backend. APR_EKEYTYPE if the key type is
 *         not known. APR_EPADDING if padding was requested but is not supported.
 *         APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_key(apr_crypto_key_t **key,
        const apr_crypto_key_rec_t *rec, const apr_crypto_t *f, apr_pool_t *p);

/**
 * @brief Create a key from the given passphrase. By default, the PBKDF2
 *        algorithm is used to generate the key from the passphrase. It is expected
 *        that the same pass phrase will generate the same key, regardless of the
 *        backend crypto platform used. The key is cleaned up when the context
 *        is cleaned, and may be reused with multiple encryption or decryption
 *        operations.
 * @note If *key is NULL, a apr_crypto_key_t will be created from a pool. If
 *       *key is not NULL, *key must point at a previously created structure.
 * @param key The key returned, see note.
 * @param ivSize The size of the initialisation vector will be returned, based
 *               on whether an IV is relevant for this type of crypto.
 * @param pass The passphrase to use.
 * @param passLen The passphrase length in bytes
 * @param salt The salt to use.
 * @param saltLen The salt length in bytes
 * @param type 3DES_192, AES_128, AES_192, AES_256.
 * @param mode Electronic Code Book / Cipher Block Chaining.
 * @param doPad Pad if necessary.
 * @param iterations Number of iterations to use in algorithm
 * @param f The context to use.
 * @param p The pool to use.
 * @return Returns APR_ENOKEY if the pass phrase is missing or empty, or if a backend
 *         error occurred while generating the key. APR_ENOCIPHER if the type or mode
 *         is not supported by the particular backend. APR_EKEYTYPE if the key type is
 *         not known. APR_EPADDING if padding was requested but is not supported.
 *         APR_ENOTIMPL if not implemented.
 * @deprecated Replaced by apr_crypto_key().
 */
APU_DECLARE(apr_status_t) apr_crypto_passphrase(apr_crypto_key_t **key,
        apr_size_t *ivSize, const char *pass, apr_size_t passLen,
        const unsigned char * salt, apr_size_t saltLen,
        const apr_crypto_block_key_type_e type,
        const apr_crypto_block_key_mode_e mode, const int doPad,
        const int iterations, const apr_crypto_t *f, apr_pool_t *p);

/**
 * @brief Initialise a context for encrypting arbitrary data using the given key.
 * @note If *ctx is NULL, a apr_crypto_block_t will be created from a pool. If
 *       *ctx is not NULL, *ctx must point at a previously created structure.
 * @param ctx The block context returned, see note.
 * @param iv Optional initialisation vector. If the buffer pointed to is NULL,
 *           an IV will be created at random, in space allocated from the pool.
 *           If the buffer pointed to is not NULL, the IV in the buffer will be
 *           used.
 * @param key The key structure to use.
 * @param blockSize The block size of the cipher.
 * @param p The pool to use.
 * @return Returns APR_ENOIV if an initialisation vector is required but not specified.
 *         Returns APR_EINIT if the backend failed to initialise the context. Returns
 *         APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_encrypt_init(
        apr_crypto_block_t **ctx, const unsigned char **iv,
        const apr_crypto_key_t *key, apr_size_t *blockSize, apr_pool_t *p);

/**
 * @brief Encrypt data provided by in, write it to out.
 * @note The number of bytes written will be written to outlen. If
 *       out is NULL, outlen will contain the maximum size of the
 *       buffer needed to hold the data, including any data
 *       generated by apr_crypto_block_encrypt_finish below. If *out points
 *       to NULL, a buffer sufficiently large will be created from
 *       the pool provided. If *out points to a not-NULL value, this
 *       value will be used as a buffer instead.
 * @param out Address of a buffer to which data will be written,
 *        see note.
 * @param outlen Length of the output will be written here.
 * @param in Address of the buffer to read.
 * @param inlen Length of the buffer to read.
 * @param ctx The block context to use.
 * @return APR_ECRYPT if an error occurred. Returns APR_ENOTIMPL if
 *         not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_encrypt(unsigned char **out,
        apr_size_t *outlen, const unsigned char *in, apr_size_t inlen,
        apr_crypto_block_t *ctx);

/**
 * @brief Encrypt final data block, write it to out.
 * @note If necessary the final block will be written out after being
 *       padded. Typically the final block will be written to the
 *       same buffer used by apr_crypto_block_encrypt, offset by the
 *       number of bytes returned as actually written by the
 *       apr_crypto_block_encrypt() call. After this call, the context
 *       is cleaned and can be reused by apr_crypto_block_encrypt_init().
 * @param out Address of a buffer to which data will be written. This
 *            buffer must already exist, and is usually the same
 *            buffer used by apr_evp_crypt(). See note.
 * @param outlen Length of the output will be written here.
 * @param ctx The block context to use.
 * @return APR_ECRYPT if an error occurred.
 * @return APR_EPADDING if padding was enabled and the block was incorrectly
 *         formatted.
 * @return APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_encrypt_finish(unsigned char *out,
        apr_size_t *outlen, apr_crypto_block_t *ctx);

/**
 * @brief Initialise a context for decrypting arbitrary data using the given key.
 * @note If *ctx is NULL, a apr_crypto_block_t will be created from a pool. If
 *       *ctx is not NULL, *ctx must point at a previously created structure.
 * @param ctx The block context returned, see note.
 * @param blockSize The block size of the cipher.
 * @param iv Optional initialisation vector.
 * @param key The key structure to use.
 * @param p The pool to use.
 * @return Returns APR_ENOIV if an initialisation vector is required but not specified.
 *         Returns APR_EINIT if the backend failed to initialise the context. Returns
 *         APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_decrypt_init(
        apr_crypto_block_t **ctx, apr_size_t *blockSize,
        const unsigned char *iv, const apr_crypto_key_t *key, apr_pool_t *p);

/**
 * @brief Decrypt data provided by in, write it to out.
 * @note The number of bytes written will be written to outlen. If
 *       out is NULL, outlen will contain the maximum size of the
 *       buffer needed to hold the data, including any data
 *       generated by apr_crypto_block_decrypt_finish below. If *out points
 *       to NULL, a buffer sufficiently large will be created from
 *       the pool provided. If *out points to a not-NULL value, this
 *       value will be used as a buffer instead.
 * @param out Address of a buffer to which data will be written,
 *        see note.
 * @param outlen Length of the output will be written here.
 * @param in Address of the buffer to read.
 * @param inlen Length of the buffer to read.
 * @param ctx The block context to use.
 * @return APR_ECRYPT if an error occurred. Returns APR_ENOTIMPL if
 *         not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_decrypt(unsigned char **out,
        apr_size_t *outlen, const unsigned char *in, apr_size_t inlen,
        apr_crypto_block_t *ctx);

/**
 * @brief Decrypt final data block, write it to out.
 * @note If necessary the final block will be written out after being
 *       padded. Typically the final block will be written to the
 *       same buffer used by apr_crypto_block_decrypt, offset by the
 *       number of bytes returned as actually written by the
 *       apr_crypto_block_decrypt() call. After this call, the context
 *       is cleaned and can be reused by apr_crypto_block_decrypt_init().
 * @param out Address of a buffer to which data will be written. This
 *            buffer must already exist, and is usually the same
 *            buffer used by apr_evp_crypt(). See note.
 * @param outlen Length of the output will be written here.
 * @param ctx The block context to use.
 * @return APR_ECRYPT if an error occurred.
 * @return APR_EPADDING if padding was enabled and the block was incorrectly
 *         formatted.
 * @return APR_ENOTIMPL if not implemented.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_decrypt_finish(unsigned char *out,
        apr_size_t *outlen, apr_crypto_block_t *ctx);

/**
 * @brief Clean encryption / decryption context.
 * @note After cleanup, a context is free to be reused if necessary.
 * @param ctx The block context to use.
 * @return Returns APR_ENOTIMPL if not supported.
 */
APU_DECLARE(apr_status_t) apr_crypto_block_cleanup(apr_crypto_block_t *ctx);

/**
 * @brief Clean encryption / decryption context.
 * @note After cleanup, a context is free to be reused if necessary.
 * @param f The context to use.
 * @return Returns APR_ENOTIMPL if not supported.
 */
APU_DECLARE(apr_status_t) apr_crypto_cleanup(apr_crypto_t *f);

/**
 * @brief Shutdown the crypto library.
 * @note After shutdown, it is expected that the init function can be called again.
 * @param driver - driver to use
 * @return Returns APR_ENOTIMPL if not supported.
 */
APU_DECLARE(apr_status_t) apr_crypto_shutdown(
        const apr_crypto_driver_t *driver);

#endif /* APU_HAVE_CRYPTO */

/** @} */

#ifdef __cplusplus
}
#endif

#endif

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