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- #include <crypto/algapi.h>
- #ifndef __HAVE_ARCH_CRYPTO_MEMNEQ
- static inline unsigned long
- __crypto_memneq_generic(const void *a, const void *b, size_t size)
- {
- unsigned long neq = 0;
- #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
- while (size >= sizeof(unsigned long)) {
- neq |= *(unsigned long *)a ^ *(unsigned long *)b;
- OPTIMIZER_HIDE_VAR(neq);
- a += sizeof(unsigned long);
- b += sizeof(unsigned long);
- size -= sizeof(unsigned long);
- }
- #endif
- while (size > 0) {
- neq |= *(unsigned char *)a ^ *(unsigned char *)b;
- OPTIMIZER_HIDE_VAR(neq);
- a += 1;
- b += 1;
- size -= 1;
- }
- return neq;
- }
- static inline unsigned long __crypto_memneq_16(const void *a, const void *b)
- {
- unsigned long neq = 0;
- #ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
- if (sizeof(unsigned long) == 8) {
- neq |= *(unsigned long *)(a) ^ *(unsigned long *)(b);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned long *)(a+8) ^ *(unsigned long *)(b+8);
- OPTIMIZER_HIDE_VAR(neq);
- } else if (sizeof(unsigned int) == 4) {
- neq |= *(unsigned int *)(a) ^ *(unsigned int *)(b);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned int *)(a+4) ^ *(unsigned int *)(b+4);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned int *)(a+8) ^ *(unsigned int *)(b+8);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned int *)(a+12) ^ *(unsigned int *)(b+12);
- OPTIMIZER_HIDE_VAR(neq);
- } else
- #endif
- {
- neq |= *(unsigned char *)(a) ^ *(unsigned char *)(b);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+1) ^ *(unsigned char *)(b+1);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+2) ^ *(unsigned char *)(b+2);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+3) ^ *(unsigned char *)(b+3);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+4) ^ *(unsigned char *)(b+4);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+5) ^ *(unsigned char *)(b+5);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+6) ^ *(unsigned char *)(b+6);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+7) ^ *(unsigned char *)(b+7);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+8) ^ *(unsigned char *)(b+8);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+9) ^ *(unsigned char *)(b+9);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+10) ^ *(unsigned char *)(b+10);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+11) ^ *(unsigned char *)(b+11);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+12) ^ *(unsigned char *)(b+12);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+13) ^ *(unsigned char *)(b+13);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+14) ^ *(unsigned char *)(b+14);
- OPTIMIZER_HIDE_VAR(neq);
- neq |= *(unsigned char *)(a+15) ^ *(unsigned char *)(b+15);
- OPTIMIZER_HIDE_VAR(neq);
- }
- return neq;
- }
- noinline unsigned long __crypto_memneq(const void *a, const void *b,
- size_t size)
- {
- switch (size) {
- case 16:
- return __crypto_memneq_16(a, b);
- default:
- return __crypto_memneq_generic(a, b, size);
- }
- }
- EXPORT_SYMBOL(__crypto_memneq);
- #endif
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