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* [PATCH] crypto: lib/gf128mul - Remove some bbe deadcode
@ 2024-12-11 22:02 linux
  2024-12-22  4:18 ` Herbert Xu
  0 siblings, 1 reply; 5+ messages in thread
From: linux @ 2024-12-11 22:02 UTC (permalink / raw)
  To: herbert, davem; +Cc: linux-crypto, linux-kernel, Dr. David Alan Gilbert

From: "Dr. David Alan Gilbert" <linux@treblig.org>

gf128mul_4k_bbe(), gf128mul_bbe() and gf128mul_init_4k_bbe()
are part of the library originally added in 2006 by
commit c494e0705d67 ("[CRYPTO] lib: table driven multiplications in
GF(2^128)")

but have never been used.

Remove them.
(BBE is Big endian Byte/Big endian bits
Note the 64k table version is used and I've left that in)

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
---
 include/crypto/gf128mul.h |  6 +---
 lib/crypto/gf128mul.c     | 75 ---------------------------------------
 2 files changed, 1 insertion(+), 80 deletions(-)

diff --git a/include/crypto/gf128mul.h b/include/crypto/gf128mul.h
index 81330c6446f6..b0853f7cada0 100644
--- a/include/crypto/gf128mul.h
+++ b/include/crypto/gf128mul.h
@@ -158,12 +158,10 @@
     64...71 72...79 80...87 88...95  96..103 104.111 112.119 120.127
 */
 
-/*	A slow generic version of gf_mul, implemented for lle and bbe
+/*	A slow generic version of gf_mul, implemented for lle
  * 	It multiplies a and b and puts the result in a */
 void gf128mul_lle(be128 *a, const be128 *b);
 
-void gf128mul_bbe(be128 *a, const be128 *b);
-
 /*
  * The following functions multiply a field element by x in
  * the polynomial field representation.  They use 64-bit word operations
@@ -224,9 +222,7 @@ struct gf128mul_4k {
 };
 
 struct gf128mul_4k *gf128mul_init_4k_lle(const be128 *g);
-struct gf128mul_4k *gf128mul_init_4k_bbe(const be128 *g);
 void gf128mul_4k_lle(be128 *a, const struct gf128mul_4k *t);
-void gf128mul_4k_bbe(be128 *a, const struct gf128mul_4k *t);
 void gf128mul_x8_ble(le128 *r, const le128 *x);
 static inline void gf128mul_free_4k(struct gf128mul_4k *t)
 {
diff --git a/lib/crypto/gf128mul.c b/lib/crypto/gf128mul.c
index 8f8c45e0cdcf..fbe72cb3453a 100644
--- a/lib/crypto/gf128mul.c
+++ b/lib/crypto/gf128mul.c
@@ -225,44 +225,6 @@ void gf128mul_lle(be128 *r, const be128 *b)
 }
 EXPORT_SYMBOL(gf128mul_lle);
 
-void gf128mul_bbe(be128 *r, const be128 *b)
-{
-	be128 p[8];
-	int i;
-
-	p[0] = *r;
-	for (i = 0; i < 7; ++i)
-		gf128mul_x_bbe(&p[i + 1], &p[i]);
-
-	memset(r, 0, sizeof(*r));
-	for (i = 0;;) {
-		u8 ch = ((u8 *)b)[i];
-
-		if (ch & 0x80)
-			be128_xor(r, r, &p[7]);
-		if (ch & 0x40)
-			be128_xor(r, r, &p[6]);
-		if (ch & 0x20)
-			be128_xor(r, r, &p[5]);
-		if (ch & 0x10)
-			be128_xor(r, r, &p[4]);
-		if (ch & 0x08)
-			be128_xor(r, r, &p[3]);
-		if (ch & 0x04)
-			be128_xor(r, r, &p[2]);
-		if (ch & 0x02)
-			be128_xor(r, r, &p[1]);
-		if (ch & 0x01)
-			be128_xor(r, r, &p[0]);
-
-		if (++i >= 16)
-			break;
-
-		gf128mul_x8_bbe(r);
-	}
-}
-EXPORT_SYMBOL(gf128mul_bbe);
-
 /*      This version uses 64k bytes of table space.
     A 16 byte buffer has to be multiplied by a 16 byte key
     value in GF(2^128).  If we consider a GF(2^128) value in
@@ -380,28 +342,6 @@ struct gf128mul_4k *gf128mul_init_4k_lle(const be128 *g)
 }
 EXPORT_SYMBOL(gf128mul_init_4k_lle);
 
-struct gf128mul_4k *gf128mul_init_4k_bbe(const be128 *g)
-{
-	struct gf128mul_4k *t;
-	int j, k;
-
-	t = kzalloc(sizeof(*t), GFP_KERNEL);
-	if (!t)
-		goto out;
-
-	t->t[1] = *g;
-	for (j = 1; j <= 64; j <<= 1)
-		gf128mul_x_bbe(&t->t[j + j], &t->t[j]);
-
-	for (j = 2; j < 256; j += j)
-		for (k = 1; k < j; ++k)
-			be128_xor(&t->t[j + k], &t->t[j], &t->t[k]);
-
-out:
-	return t;
-}
-EXPORT_SYMBOL(gf128mul_init_4k_bbe);
-
 void gf128mul_4k_lle(be128 *a, const struct gf128mul_4k *t)
 {
 	u8 *ap = (u8 *)a;
@@ -417,20 +357,5 @@ void gf128mul_4k_lle(be128 *a, const struct gf128mul_4k *t)
 }
 EXPORT_SYMBOL(gf128mul_4k_lle);
 
-void gf128mul_4k_bbe(be128 *a, const struct gf128mul_4k *t)
-{
-	u8 *ap = (u8 *)a;
-	be128 r[1];
-	int i = 0;
-
-	*r = t->t[ap[0]];
-	while (++i < 16) {
-		gf128mul_x8_bbe(r);
-		be128_xor(r, r, &t->t[ap[i]]);
-	}
-	*a = *r;
-}
-EXPORT_SYMBOL(gf128mul_4k_bbe);
-
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Functions for multiplying elements of GF(2^128)");
-- 
2.47.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-12-23 12:21 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2024-12-11 22:02 [PATCH] crypto: lib/gf128mul - Remove some bbe deadcode linux
2024-12-22  4:18 ` Herbert Xu
2024-12-22 11:54   ` Dr. David Alan Gilbert
2024-12-23  2:53     ` Herbert Xu
2024-12-23 12:21       ` Dr. David Alan Gilbert

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