Revert "we do not use this code anymore"

This reverts commit 2d02051caa999d383103931097e44b9cac56c3fb.

1 files changed, 130 insertions, 0 deletions

diff --git a/include/openssl/rand_drbg.h b/include/openssl/rand_drbg.h
new file mode 100644
index 0000000000..45b731b73c
--- /dev/null
+++ b/include/openssl/rand_drbg.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2017-2018 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
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#ifndef HEADER_DRBG_RAND_H
+# define HEADER_DRBG_RAND_H
+
+# include <time.h>
+# include <openssl/ossl_typ.h>
+# include <openssl/obj_mac.h>
+
+/*
+ * RAND_DRBG  flags
+ *
+ * Note: if new flags are added, the constant `rand_drbg_used_flags`
+ *       in drbg_lib.c needs to be updated accordingly.
+ */
+
+/* In CTR mode, disable derivation function ctr_df */
+# define RAND_DRBG_FLAG_CTR_NO_DF            0x1
+
+
+# if OPENSSL_API_COMPAT < 0x10200000L
+/* This #define was replaced by an internal constant and should not be used. */
+#  define RAND_DRBG_USED_FLAGS  (RAND_DRBG_FLAG_CTR_NO_DF)
+# endif
+
+/*
+ * Default security strength (in the sense of [NIST SP 800-90Ar1])
+ *
+ * NIST SP 800-90Ar1 supports the strength of the DRBG being smaller than that
+ * of the cipher by collecting less entropy. The current DRBG implementation
+ * does not take RAND_DRBG_STRENGTH into account and sets the strength of the
+ * DRBG to that of the cipher.
+ *
+ * RAND_DRBG_STRENGTH is currently only used for the legacy RAND
+ * implementation.
+ *
+ * Currently supported ciphers are: NID_aes_128_ctr, NID_aes_192_ctr and
+ * NID_aes_256_ctr
+ */
+# define RAND_DRBG_STRENGTH             256
+/* Default drbg type */
+# define RAND_DRBG_TYPE                 NID_aes_256_ctr
+/* Default drbg flags */
+# define RAND_DRBG_FLAGS                0
+
+
+# ifdef  __cplusplus
+extern "C" {
+# endif
+
+/*
+ * Object lifetime functions.
+ */
+RAND_DRBG *RAND_DRBG_new(int type, unsigned int flags, RAND_DRBG *parent);
+RAND_DRBG *RAND_DRBG_secure_new(int type, unsigned int flags, RAND_DRBG *parent);
+int RAND_DRBG_set(RAND_DRBG *drbg, int type, unsigned int flags);
+int RAND_DRBG_set_defaults(int type, unsigned int flags);
+int RAND_DRBG_instantiate(RAND_DRBG *drbg,
+                          const unsigned char *pers, size_t perslen);
+int RAND_DRBG_uninstantiate(RAND_DRBG *drbg);
+void RAND_DRBG_free(RAND_DRBG *drbg);
+
+/*
+ * Object "use" functions.
+ */
+int RAND_DRBG_reseed(RAND_DRBG *drbg,
+                     const unsigned char *adin, size_t adinlen,
+                     int prediction_resistance);
+int RAND_DRBG_generate(RAND_DRBG *drbg, unsigned char *out, size_t outlen,
+                       int prediction_resistance,
+                       const unsigned char *adin, size_t adinlen);
+int RAND_DRBG_bytes(RAND_DRBG *drbg, unsigned char *out, size_t outlen);
+
+int RAND_DRBG_set_reseed_interval(RAND_DRBG *drbg, unsigned int interval);
+int RAND_DRBG_set_reseed_time_interval(RAND_DRBG *drbg, time_t interval);
+
+int RAND_DRBG_set_reseed_defaults(
+                                  unsigned int master_reseed_interval,
+                                  unsigned int slave_reseed_interval,
+                                  time_t master_reseed_time_interval,
+                                  time_t slave_reseed_time_interval
+                                  );
+
+RAND_DRBG *RAND_DRBG_get0_master(void);
+RAND_DRBG *RAND_DRBG_get0_public(void);
+RAND_DRBG *RAND_DRBG_get0_private(void);
+
+/*
+ * EXDATA
+ */
+# define RAND_DRBG_get_ex_new_index(l, p, newf, dupf, freef) \
+    CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG, l, p, newf, dupf, freef)
+int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *arg);
+void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx);
+
+/*
+ * Callback function typedefs
+ */
+typedef size_t (*RAND_DRBG_get_entropy_fn)(RAND_DRBG *drbg,
+                                           unsigned char **pout,
+                                           int entropy, size_t min_len,
+                                           size_t max_len,
+                                           int prediction_resistance);
+typedef void (*RAND_DRBG_cleanup_entropy_fn)(RAND_DRBG *ctx,
+                                             unsigned char *out, size_t outlen);
+typedef size_t (*RAND_DRBG_get_nonce_fn)(RAND_DRBG *drbg, unsigned char **pout,
+                                         int entropy, size_t min_len,
+                                         size_t max_len);
+typedef void (*RAND_DRBG_cleanup_nonce_fn)(RAND_DRBG *drbg,
+                                           unsigned char *out, size_t outlen);
+
+int RAND_DRBG_set_callbacks(RAND_DRBG *drbg,
+                            RAND_DRBG_get_entropy_fn get_entropy,
+                            RAND_DRBG_cleanup_entropy_fn cleanup_entropy,
+                            RAND_DRBG_get_nonce_fn get_nonce,
+                            RAND_DRBG_cleanup_nonce_fn cleanup_nonce);
+
+
+# ifdef  __cplusplus
+}
+# endif
+
+#endif