From 2d59006262d6e45f41ee325af78433475884dca4 Mon Sep 17 00:00:00 2001 From: Emma Miler Date: Fri, 2 Dec 2022 23:00:33 +0100 Subject: Move include directory (#337) * Move include directory to shared folder This commit moves the `include` directory from the NorthstarDLL project folder to the solution folder. This allows both the DLL and Launcher project to target it properly. * Fix filters * Update memalloc.h * Fix filters * Update NorthstarLauncher.vcxproj * Remove stuff from other PR * Update NorthstarLauncher.vcxproj * Update NorthstarLauncher.vcxproj * Update NorthstarDLL.vcxproj --- include/crypto/rand_pool.h | 109 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 include/crypto/rand_pool.h (limited to 'include/crypto/rand_pool.h') diff --git a/include/crypto/rand_pool.h b/include/crypto/rand_pool.h new file mode 100644 index 00000000..f4d1d954 --- /dev/null +++ b/include/crypto/rand_pool.h @@ -0,0 +1,109 @@ +/* + * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#ifndef OSSL_PROVIDER_RAND_POOL_H +# define OSSL_PROVIDER_RAND_POOL_H +# pragma once + +# include +# include + +/* + * Maximum allocation size for RANDOM_POOL buffers + * + * The max_len value for the buffer provided to the rand_drbg_get_entropy() + * callback is currently 2^31 bytes (2 gigabytes), if a derivation function + * is used. Since this is much too large to be allocated, the ossl_rand_pool_new() + * function chooses more modest values as default pool length, bounded + * by RAND_POOL_MIN_LENGTH and RAND_POOL_MAX_LENGTH + * + * The choice of the RAND_POOL_FACTOR is large enough such that the + * RAND_POOL can store a random input which has a lousy entropy rate of + * 8/256 (= 0.03125) bits per byte. This input will be sent through the + * derivation function which 'compresses' the low quality input into a + * high quality output. + * + * The factor 1.5 below is the pessimistic estimate for the extra amount + * of entropy required when no get_nonce() callback is defined. + */ +# define RAND_POOL_FACTOR 256 +# define RAND_POOL_MAX_LENGTH (RAND_POOL_FACTOR * \ + 3 * (RAND_DRBG_STRENGTH / 16)) +/* + * = (RAND_POOL_FACTOR * \ + * 1.5 * (RAND_DRBG_STRENGTH / 8)) + */ + +/* + * Initial allocation minimum. + * + * There is a distinction between the secure and normal allocation minimums. + * Ideally, the secure allocation size should be a power of two. The normal + * allocation size doesn't have any such restriction. + * + * The secure value is based on 128 bits of secure material, which is 16 bytes. + * Typically, the DRBGs will set a minimum larger than this so optimal + * allocation ought to take place (for full quality seed material). + * + * The normal value has been chosen by noticing that the rand_drbg_get_nonce + * function is usually the largest of the built in allocation (twenty four + * bytes and then appending another sixteen bytes). This means the buffer ends + * with 40 bytes. The value of forty eight is comfortably above this which + * allows some slack in the platform specific values used. + */ +# define RAND_POOL_MIN_ALLOCATION(secure) ((secure) ? 16 : 48) + +/* + * The 'random pool' acts as a dumb container for collecting random + * input from various entropy sources. It is the callers duty to 1) initialize + * the random pool, 2) pass it to the polling callbacks, 3) seed the RNG, and + * 4) cleanup the random pool again. + * + * The random pool contains no locking mechanism because its scope and + * lifetime is intended to be restricted to a single stack frame. + */ +typedef struct rand_pool_st { + unsigned char *buffer; /* points to the beginning of the random pool */ + size_t len; /* current number of random bytes contained in the pool */ + + int attached; /* true pool was attached to existing buffer */ + int secure; /* 1: allocated on the secure heap, 0: otherwise */ + + size_t min_len; /* minimum number of random bytes requested */ + size_t max_len; /* maximum number of random bytes (allocated buffer size) */ + size_t alloc_len; /* current number of bytes allocated */ + size_t entropy; /* current entropy count in bits */ + size_t entropy_requested; /* requested entropy count in bits */ +} RAND_POOL; + +RAND_POOL *ossl_rand_pool_new(int entropy_requested, int secure, + size_t min_len, size_t max_len); +RAND_POOL *ossl_rand_pool_attach(const unsigned char *buffer, size_t len, + size_t entropy); +void ossl_rand_pool_free(RAND_POOL *pool); + +const unsigned char *ossl_rand_pool_buffer(RAND_POOL *pool); +unsigned char *ossl_rand_pool_detach(RAND_POOL *pool); +void ossl_rand_pool_reattach(RAND_POOL *pool, unsigned char *buffer); + +size_t ossl_rand_pool_entropy(RAND_POOL *pool); +size_t ossl_rand_pool_length(RAND_POOL *pool); + +size_t ossl_rand_pool_entropy_available(RAND_POOL *pool); +size_t ossl_rand_pool_entropy_needed(RAND_POOL *pool); +/* |entropy_factor| expresses how many bits of data contain 1 bit of entropy */ +size_t ossl_rand_pool_bytes_needed(RAND_POOL *pool, unsigned int entropy_factor); +size_t ossl_rand_pool_bytes_remaining(RAND_POOL *pool); + +int ossl_rand_pool_add(RAND_POOL *pool, + const unsigned char *buffer, size_t len, size_t entropy); +unsigned char *ossl_rand_pool_add_begin(RAND_POOL *pool, size_t len); +int ossl_rand_pool_add_end(RAND_POOL *pool, size_t len, size_t entropy); + +#endif /* OSSL_PROVIDER_RAND_POOL_H */ -- cgit v1.2.3