2  * siphash.h - SipHash-2-4 in a single header file
45  *   - Address lack of stdint.h for Visual Studio 2003 to 2008
99 #include "../../lv_conf_internal.h"
104 #include <stddef.h> /* size_t */
105 #include <stdint.h> /* uint64_t uint32_t uint8_t */
169 sip_round(struct siphash *H, const int rounds) {  in sip_round()  argument
173     H->v0 += H->v1;  in sip_round()
174     H->v1 = SIP_ROTL(H->v1, 13);  in sip_round()
175     H->v1 ^= H->v0;  in sip_round()
176     H->v0 = SIP_ROTL(H->v0, 32);  in sip_round()
178     H->v2 += H->v3;  in sip_round()
179     H->v3 = SIP_ROTL(H->v3, 16);  in sip_round()
180     H->v3 ^= H->v2;  in sip_round()
182     H->v0 += H->v3;  in sip_round()
183     H->v3 = SIP_ROTL(H->v3, 21);  in sip_round()
184     H->v3 ^= H->v0;  in sip_round()
186     H->v2 += H->v1;  in sip_round()
187     H->v1 = SIP_ROTL(H->v1, 17);  in sip_round()
188     H->v1 ^= H->v2;  in sip_round()
189     H->v2 = SIP_ROTL(H->v2, 32);  in sip_round()
194 sip24_init(struct siphash *H, const struct sipkey *key) {  in sip24_init()  argument
195   H->v0 = SIP_ULL(0x736f6d65U, 0x70736575U) ^ key->k[0];  in sip24_init()
196   H->v1 = SIP_ULL(0x646f7261U, 0x6e646f6dU) ^ key->k[1];  in sip24_init()
197   H->v2 = SIP_ULL(0x6c796765U, 0x6e657261U) ^ key->k[0];  in sip24_init()
198   H->v3 = SIP_ULL(0x74656462U, 0x79746573U) ^ key->k[1];  in sip24_init()
200   H->p = H->buf;  in sip24_init()
201   H->c = 0;  in sip24_init()
203   return H;  in sip24_init()
209 sip24_update(struct siphash *H, const void *src, size_t len) {  in sip24_update()  argument
214     while (p < pe && H->p < sip_endof(H->buf))  in sip24_update()
215       *H->p++ = *p++;  in sip24_update()
217     if (H->p < sip_endof(H->buf))  in sip24_update()
220     m = SIP_U8TO64_LE(H->buf);  in sip24_update()
221     H->v3 ^= m;  in sip24_update()
222     sip_round(H, 2);  in sip24_update()
223     H->v0 ^= m;  in sip24_update()
225     H->p = H->buf;  in sip24_update()
226     H->c += 8;  in sip24_update()
229   return H;  in sip24_update()
233 sip24_final(struct siphash *H) {  in sip24_final()  argument
234   const char left = (char)(H->p - H->buf);  in sip24_final()
235   uint64_t b = (H->c + left) << 56;  in sip24_final()
239     b |= (uint64_t)H->buf[6] << 48;  in sip24_final()
242     b |= (uint64_t)H->buf[5] << 40;  in sip24_final()
245     b |= (uint64_t)H->buf[4] << 32;  in sip24_final()
248     b |= (uint64_t)H->buf[3] << 24;  in sip24_final()
251     b |= (uint64_t)H->buf[2] << 16;  in sip24_final()
254     b |= (uint64_t)H->buf[1] << 8;  in sip24_final()
257     b |= (uint64_t)H->buf[0] << 0;  in sip24_final()
263   H->v3 ^= b;  in sip24_final()
264   sip_round(H, 2);  in sip24_final()
265   H->v0 ^= b;  in sip24_final()
266   H->v2 ^= 0xff;  in sip24_final()
267   sip_round(H, 4);  in sip24_final()
269   return H->v0 ^ H->v1 ^ H->v2 ^ H->v3;  in sip24_final()
379 #  include <stdio.h>