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Diffstat (limited to 'include/apr_crypto.h')
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diff --git a/include/apr_crypto.h b/include/apr_crypto.h new file mode 100644 index 0000000..b90f3fe --- /dev/null +++ b/include/apr_crypto.h @@ -0,0 +1,507 @@ +/* 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 |