--- /dev/null
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+
+/**
+ @file gcm_mult_h.c
+ GCM implementation, do the GF mult, by Tom St Denis
+*/
+#include "tomcrypt.h"
+
+#if defined(LTC_GCM_MODE)
+/**
+ GCM multiply by H
+ @param gcm The GCM state which holds the H value
+ @param I The value to multiply H by
+ */
+void gcm_mult_h(gcm_state *gcm, unsigned char *I)
+{
+ unsigned char T[16];
+#ifdef LTC_GCM_TABLES
+ int x;
+#ifdef LTC_GCM_TABLES_SSE2
+ asm("movdqa (%0),%%xmm0"::"r"(&gcm->PC[0][I[0]][0]));
+ for (x = 1; x < 16; x++) {
+ asm("pxor (%0),%%xmm0"::"r"(&gcm->PC[x][I[x]][0]));
+ }
+ asm("movdqa %%xmm0,(%0)"::"r"(&T));
+#else
+ int y;
+ XMEMCPY(T, &gcm->PC[0][I[0]][0], 16);
+ for (x = 1; x < 16; x++) {
+#ifdef LTC_FAST
+ for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
+ *(LTC_FAST_TYPE_PTR_CAST(T + y)) ^= *(LTC_FAST_TYPE_PTR_CAST(&gcm->PC[x][I[x]][y]));
+ }
+#else
+ for (y = 0; y < 16; y++) {
+ T[y] ^= gcm->PC[x][I[x]][y];
+ }
+#endif /* LTC_FAST */
+ }
+#endif /* LTC_GCM_TABLES_SSE2 */
+#else
+ gcm_gf_mult(gcm->H, I, T);
+#endif
+ XMEMCPY(I, T, 16);
+}
+#endif
+
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */