| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| #ifndef _SECRNG_H_ |
| #define _SECRNG_H_ |
| /* |
| * secrng.h - public data structures and prototypes for the secure random |
| * number generator |
| */ |
| |
| /******************************************/ |
| /* |
| ** Random number generation. A cryptographically strong random number |
| ** generator. |
| */ |
| |
| #include "blapi.h" |
| |
| /* the number of bytes to read from the system random number generator */ |
| #define SYSTEM_RNG_SEED_COUNT 1024 |
| |
| SEC_BEGIN_PROTOS |
| |
| /* |
| ** The following functions are provided by the security library |
| ** but are differently implemented for the UNIX, Win, and OS/2 |
| ** versions |
| */ |
| |
| /* |
| ** Get the "noisiest" information available on the system. |
| ** The amount of data returned depends on the system implementation. |
| ** It will not exceed maxbytes, but may be (much) less. |
| ** Returns number of noise bytes copied into buf, or zero if error. |
| */ |
| extern size_t RNG_GetNoise(void *buf, size_t maxbytes); |
| |
| /* |
| ** RNG_SystemInfoForRNG should be called before any use of SSL. It |
| ** gathers up the system specific information to help seed the |
| ** state of the global random number generator. |
| */ |
| extern void RNG_SystemInfoForRNG(void); |
| |
| /* |
| ** Use the contents (and stat) of a file to help seed the |
| ** global random number generator. |
| */ |
| extern void RNG_FileForRNG(const char *filename); |
| |
| /* |
| ** Get maxbytes bytes of random data from the system random number |
| ** generator. |
| ** Returns the number of bytes copied into buf -- maxbytes if success |
| ** or zero if error. |
| ** Errors: |
| ** PR_NOT_IMPLEMENTED_ERROR There is no system RNG on the platform. |
| ** SEC_ERROR_NEED_RANDOM The system RNG failed. |
| */ |
| extern size_t RNG_SystemRNG(void *buf, size_t maxbytes); |
| |
| SEC_END_PROTOS |
| |
| #endif /* _SECRNG_H_ */ |