crypto: lib - move __crypto_xor into utils

CRYPTO_LIB_CHACHA depends on CRYPTO for __crypto_xor, defined in
crypto/algapi.c.  This is a layering violation because the dependencies
should only go in the other direction (crypto/ => lib/crypto/).  Also
the correct dependency would be CRYPTO_ALGAPI, not CRYPTO.  Fix this by
moving __crypto_xor into the utils module in lib/crypto/.

Note that CRYPTO_LIB_CHACHA_GENERIC selected XOR_BLOCKS, which is
unrelated and unnecessary.  It was perhaps thought that XOR_BLOCKS was
needed for __crypto_xor, but that's not the case.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 0 insertions, 71 deletions

diff --git a/crypto/algapi.c b/crypto/algapi.c
index d1c99288af3e..5c69ff8e8fa5 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -997,77 +997,6 @@ void crypto_inc(u8 *a, unsigned int size)
 }
 EXPORT_SYMBOL_GPL(crypto_inc);
 
-void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
-{
-	int relalign = 0;
-
-	if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
-		int size = sizeof(unsigned long);
-		int d = (((unsigned long)dst ^ (unsigned long)src1) |
-			 ((unsigned long)dst ^ (unsigned long)src2)) &
-			(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++ = *src1++ ^ *src2++;
-			len--;
-		}
-	}
-
-	while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
-		if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
-			u64 l = get_unaligned((u64 *)src1) ^
-				get_unaligned((u64 *)src2);
-			put_unaligned(l, (u64 *)dst);
-		} else {
-			*(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
-		}
-		dst += 8;
-		src1 += 8;
-		src2 += 8;
-		len -= 8;
-	}
-
-	while (len >= 4 && !(relalign & 3)) {
-		if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
-			u32 l = get_unaligned((u32 *)src1) ^
-				get_unaligned((u32 *)src2);
-			put_unaligned(l, (u32 *)dst);
-		} else {
-			*(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
-		}
-		dst += 4;
-		src1 += 4;
-		src2 += 4;
-		len -= 4;
-	}
-
-	while (len >= 2 && !(relalign & 1)) {
-		if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
-			u16 l = get_unaligned((u16 *)src1) ^
-				get_unaligned((u16 *)src2);
-			put_unaligned(l, (u16 *)dst);
-		} else {
-			*(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
-		}
-		dst += 2;
-		src1 += 2;
-		src2 += 2;
-		len -= 2;
-	}
-
-	while (len--)
-		*dst++ = *src1++ ^ *src2++;
-}
-EXPORT_SYMBOL_GPL(__crypto_xor);
-
 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 {
 	return alg->cra_ctxsize +