unsigned char random_u8(unsigned int seed)
{
rand_t *r;
int rv;
unsigned char rand;
r = rand_open();
if (r == NULL) return -1;
rv = rand_set(r,&seed,4);
if (r == NULL) return -1;
rand = rand_uint8(r);
r = rand_close(r);
return rand;
}
static unsigned int Rand_GenRand(unsigned char *pRand, unsigned long ulRandLen)
{
rand_t *r;
int rv;
// time_t seed;
r = rand_open();
if (r == NULL) return -1;
if(g_ulSendlen != 0)
{
rv = rand_set(r,&g_Seed,g_ulSendlen);
if (r == NULL) return -1;
}
rv = rand_get(r,pRand,ulRandLen);
if (r == NULL) return -1;
r = rand_close(r);
memcpy(g_Seed,pRand,g_ulSendlen);
return 0;
}
/*lint -e525 -e438*/
int GeneratePublicKey(DH_KEY *params, unsigned char *publicValue, unsigned int pubValueLen)
{
rand_t *rd;
int rv;
time_t seed;
unsigned int bytesNeeded;
unsigned char seedByte[20] = {0};
R_RANDOM_STRUCT randomStruct;
bytesNeeded = pubValueLen;
randomStruct.bytesNeeded = bytesNeeded;
memset ((POINTER)randomStruct.state, 0, sizeof (randomStruct.state));
randomStruct.outputAvailable = 0;
time(&seed);
rd = rand_open();
if (rd == NULL) return -1;
rand_set(rd,&seed,4);
if (rd == NULL) return -1;
while (1)
{
bytesNeeded = randomStruct.bytesNeeded;
if (bytesNeeded == 0)
break;
rand_get(rd,seedByte,16);
if (rd == NULL) return -1;
RandomUpdate(&randomStruct, seedByte, 16);
}
rd = rand_close(rd);
params->priVallen = pubValueLen;
rv = SetupDHAgreement(publicValue,params->privateValue,pubValueLen, params,&randomStruct);
return rv;
}
int random_generate(unsigned int seed_ext,unsigned char *buf,unsigned len)
{
#define SEEDBYTE_NUM 128
unsigned int seed=seed_ext;
rand_t *r;
int rv;
unsigned pos,cnt;
unsigned char seedByte[SEEDBYTE_NUM] = {0};
r = rand_open();
if (r == NULL) return -1;
rv = rand_set(r,&seed,4);
if (r == NULL) return -1;
rv = rand_get(r,seedByte,SEEDBYTE_NUM);
r = rand_close(r);
if(len <= SEEDBYTE_NUM){
memcpy(buf,seedByte,len);
}
else{
pos = 0;
while(len>0){
if(len>=SEEDBYTE_NUM){
cnt = SEEDBYTE_NUM;
}
else{
cnt = len;
}
memcpy(&buf[pos],seedByte,cnt);
len -= cnt;
pos += cnt;
//printf("len:%d\n",len);
}
}
#undef SEEDBYTE_NUM
return 0;
}