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-rw-r--r--crypto/algapi.c68
1 files changed, 50 insertions, 18 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c
index 1fad2a6b3bbb..6b52e8f0b95f 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -962,34 +962,66 @@ void crypto_inc(u8 *a, unsigned int size)
__be32 *b = (__be32 *)(a + size);
u32 c;
- for (; size >= 4; size -= 4) {
- c = be32_to_cpu(*--b) + 1;
- *b = cpu_to_be32(c);
- if (c)
- return;
- }
+ if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
+ !((unsigned long)b & (__alignof__(*b) - 1)))
+ for (; size >= 4; size -= 4) {
+ c = be32_to_cpu(*--b) + 1;
+ *b = cpu_to_be32(c);
+ if (c)
+ return;
+ }
crypto_inc_byte(a, size);
}
EXPORT_SYMBOL_GPL(crypto_inc);
-static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
+void __crypto_xor(u8 *dst, const u8 *src, unsigned int len)
{
- for (; size; size--)
- *a++ ^= *b++;
-}
+ int relalign = 0;
+
+ if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
+ int size = sizeof(unsigned long);
+ int d = ((unsigned long)dst ^ (unsigned long)src) & (size - 1);
+
+ relalign = d ? 1 << __ffs(d) : size;
+
+ /*
+ * If we care about alignment, process as many bytes as
+ * needed to advance dst and src to values whose alignments
+ * equal their relative alignment. This will allow us to
+ * process the remainder of the input using optimal strides.
+ */
+ while (((unsigned long)dst & (relalign - 1)) && len > 0) {
+ *dst++ ^= *src++;
+ len--;
+ }
+ }
-void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
-{
- u32 *a = (u32 *)dst;
- u32 *b = (u32 *)src;
+ while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
+ *(u64 *)dst ^= *(u64 *)src;
+ dst += 8;
+ src += 8;
+ len -= 8;
+ }
- for (; size >= 4; size -= 4)
- *a++ ^= *b++;
+ while (len >= 4 && !(relalign & 3)) {
+ *(u32 *)dst ^= *(u32 *)src;
+ dst += 4;
+ src += 4;
+ len -= 4;
+ }
+
+ while (len >= 2 && !(relalign & 1)) {
+ *(u16 *)dst ^= *(u16 *)src;
+ dst += 2;
+ src += 2;
+ len -= 2;
+ }
- crypto_xor_byte((u8 *)a, (u8 *)b, size);
+ while (len--)
+ *dst++ ^= *src++;
}
-EXPORT_SYMBOL_GPL(crypto_xor);
+EXPORT_SYMBOL_GPL(__crypto_xor);
unsigned int crypto_alg_extsize(struct crypto_alg *alg)
{