Avoid two memory allocations in each RAND_DRBG_bytes

[openssl.git] / crypto / include / internal / rand_int.h

diff --git a/crypto/include/internal/rand_int.h b/crypto/include/internal/rand_int.h
index d90d9c5f639a93ec50338da62e882ea0471aa82b..888cab1b8f6644b4a70a12afec5614f7ec63108b 100644 (file)
--- a/crypto/include/internal/rand_int.h
+++ b/crypto/include/internal/rand_int.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -25,6 +25,7 @@ typedef struct rand_pool_st RAND_POOL;
 
 void rand_cleanup_int(void);
 void rand_drbg_cleanup_int(void);
+void drbg_delete_thread_state(void);
 void rand_fork(void);
 
 /* Hardware-based seeding functions. */
@@ -34,33 +35,45 @@ size_t rand_acquire_entropy_from_cpu(RAND_POOL *pool);
 /* DRBG entropy callbacks. */
 size_t rand_drbg_get_entropy(RAND_DRBG *drbg,
                              unsigned char **pout,
-                             int entropy, size_t min_len, size_t max_len);
+                             int entropy, size_t min_len, size_t max_len,
+                             int prediction_resistance);
 void rand_drbg_cleanup_entropy(RAND_DRBG *drbg,
                                unsigned char *out, size_t outlen);
-size_t rand_drbg_get_additional_data(unsigned char **pout, size_t max_len);
+size_t rand_drbg_get_nonce(RAND_DRBG *drbg,
+                           unsigned char **pout,
+                           int entropy, size_t min_len, size_t max_len);
+void rand_drbg_cleanup_nonce(RAND_DRBG *drbg,
+                             unsigned char *out, size_t outlen);
 
+size_t rand_drbg_get_additional_data(RAND_POOL *pool, unsigned char **pout);
+
+void rand_drbg_cleanup_additional_data(RAND_POOL *pool, unsigned char *out);
 
 /*
  * RAND_POOL functions
  */
 RAND_POOL *rand_pool_new(int entropy_requested, size_t min_len, size_t max_len);
+RAND_POOL *rand_pool_attach(const unsigned char *buffer, size_t len,
+                            size_t entropy);
 void rand_pool_free(RAND_POOL *pool);
 
 const unsigned char *rand_pool_buffer(RAND_POOL *pool);
 unsigned char *rand_pool_detach(RAND_POOL *pool);
+void rand_pool_reattach(RAND_POOL *pool, unsigned char *buffer);
 
 size_t rand_pool_entropy(RAND_POOL *pool);
 size_t rand_pool_length(RAND_POOL *pool);
 
 size_t rand_pool_entropy_available(RAND_POOL *pool);
 size_t rand_pool_entropy_needed(RAND_POOL *pool);
-size_t rand_pool_bytes_needed(RAND_POOL *pool, unsigned int entropy_per_byte);
+/* |entropy_factor| expresses how many bits of data contain 1 bit of entropy */
+size_t rand_pool_bytes_needed(RAND_POOL *pool, unsigned int entropy_factor);
 size_t rand_pool_bytes_remaining(RAND_POOL *pool);
 
-size_t rand_pool_add(RAND_POOL *pool,
-                     const unsigned char *buffer, size_t len, size_t entropy);
+int rand_pool_add(RAND_POOL *pool,
+                  const unsigned char *buffer, size_t len, size_t entropy);
 unsigned char *rand_pool_add_begin(RAND_POOL *pool, size_t len);
-size_t rand_pool_add_end(RAND_POOL *pool, size_t len, size_t entropy);
+int rand_pool_add_end(RAND_POOL *pool, size_t len, size_t entropy);
 
 
 /*
@@ -75,4 +88,47 @@ size_t rand_pool_add_end(RAND_POOL *pool, size_t len, size_t entropy);
  */
 size_t rand_pool_acquire_entropy(RAND_POOL *pool);
 
+/*
+ * Add some application specific nonce data
+ *
+ * This function is platform specific and adds some application specific
+ * data to the nonce used for instantiating the drbg.
+ *
+ * This data currently consists of the process and thread id, and a high
+ * resolution timestamp. The data does not include an atomic counter,
+ * because that is added by the calling function rand_drbg_get_nonce().
+ *
+ * Returns 1 on success and 0 on failure.
+ */
+int rand_pool_add_nonce_data(RAND_POOL *pool);
+
+
+/*
+ * Add some platform specific additional data
+ *
+ * This function is platform specific and adds some random noise to the
+ * additional data used for generating random bytes and for reseeding
+ * the drbg.
+ *
+ * Returns 1 on success and 0 on failure.
+ */
+int rand_pool_add_additional_data(RAND_POOL *pool);
+
+/*
+ * Initialise the random pool reseeding sources.
+ *
+ * Returns 1 on success and 0 on failure.
+ */
+int rand_pool_init(void);
+
+/*
+ * Finalise the random pool reseeding sources.
+ */
+void rand_pool_cleanup(void);
+
+/*
+ * Control the random pool use of open file descriptors.
+ */
+void rand_pool_keep_random_devices_open(int keep);
+
 #endif