1 /* This Source Code Form is subject to the terms of the Mozilla Public 2 * License, v. 2.0. If a copy of the MPL was not distributed with this 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 4 5 #ifndef _SECRNG_H_ 6 #define _SECRNG_H_ 7 /* 8 * secrng.h - public data structures and prototypes for the secure random 9 * number generator 10 */ 11 12 /******************************************/ 13 /* 14 ** Random number generation. A cryptographically strong random number 15 ** generator. 16 */ 17 18 #include "blapi.h" 19 20 /* the number of bytes to read from the system random number generator */ 21 #define SYSTEM_RNG_SEED_COUNT 1024 22 23 SEC_BEGIN_PROTOS 24 25 /* 26 ** The following functions are provided by the security library 27 ** but are differently implemented for the UNIX, Win, and OS/2 28 ** versions 29 */ 30 31 /* 32 ** Get the "noisiest" information available on the system. 33 ** The amount of data returned depends on the system implementation. 34 ** It will not exceed maxbytes, but may be (much) less. 35 ** Returns number of noise bytes copied into buf, or zero if error. 36 */ 37 extern size_t RNG_GetNoise(void *buf, size_t maxbytes); 38 39 /* 40 ** RNG_SystemInfoForRNG should be called before any use of SSL. It 41 ** gathers up the system specific information to help seed the 42 ** state of the global random number generator. 43 */ 44 extern void RNG_SystemInfoForRNG(void); 45 46 /* 47 ** Use the contents (and stat) of a file to help seed the 48 ** global random number generator. 49 */ 50 extern void RNG_FileForRNG(const char *filename); 51 52 /* 53 ** Get maxbytes bytes of random data from the system random number 54 ** generator. 55 ** Returns the number of bytes copied into buf -- maxbytes if success 56 ** or zero if error. 57 ** Errors: 58 ** PR_NOT_IMPLEMENTED_ERROR There is no system RNG on the platform. 59 ** SEC_ERROR_NEED_RANDOM The system RNG failed. 60 */ 61 extern size_t RNG_SystemRNG(void *buf, size_t maxbytes); 62 63 SEC_END_PROTOS 64 65 #endif /* _SECRNG_H_ */ 66