[v2,3/3] crypto: ctr - remove unused crypto_ctr_encrypt_walk()

Commit Message

Ard Biesheuvel April 3, 2025, 7:19 a.m. UTC

From: Ard Biesheuvel <[e-mail]>

crypto_ctr_encrypt_walk() is no longer used so remove it.

Note that some existing drivers currently rely on the transitive
includes of some other crypto headers so retain those for the time
being.

Signed-off-by: Ard Biesheuvel <[e-mail]>
---
 include/crypto/ctr.h | 47 --------------------
 1 file changed, 47 deletions(-)

Patch

diff --git a/include/crypto/ctr.h b/include/crypto/ctr.h
index da1ee73e9ce9..c41685874f00 100644
--- a/include/crypto/ctr.h
+++ b/include/crypto/ctr.h
@@ -10,56 +10,9 @@ 
 
 #include <crypto/algapi.h>
 #include <crypto/internal/skcipher.h>
-#include <linux/string.h>
-#include <linux/types.h>
 
 #define CTR_RFC3686_NONCE_SIZE 4
 #define CTR_RFC3686_IV_SIZE 8
 #define CTR_RFC3686_BLOCK_SIZE 16
 
-static inline int crypto_ctr_encrypt_walk(struct skcipher_request *req,
-					  void (*fn)(struct crypto_skcipher *,
-						     const u8 *, u8 *))
-{
-	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
-	int blocksize = crypto_skcipher_chunksize(tfm);
-	u8 buf[MAX_CIPHER_BLOCKSIZE];
-	struct skcipher_walk walk;
-	int err;
-
-	/* avoid integer division due to variable blocksize parameter */
-	if (WARN_ON_ONCE(!is_power_of_2(blocksize)))
-		return -EINVAL;
-
-	err = skcipher_walk_virt(&walk, req, false);
-
-	while (walk.nbytes > 0) {
-		const u8 *src = walk.src.virt.addr;
-		u8 *dst = walk.dst.virt.addr;
-		int nbytes = walk.nbytes;
-		int tail = 0;
-
-		if (nbytes < walk.total) {
-			tail = walk.nbytes & (blocksize - 1);
-			nbytes -= tail;
-		}
-
-		do {
-			int bsize = min(nbytes, blocksize);
-
-			fn(tfm, walk.iv, buf);
-
-			crypto_xor_cpy(dst, src, buf, bsize);
-			crypto_inc(walk.iv, blocksize);
-
-			dst += bsize;
-			src += bsize;
-			nbytes -= bsize;
-		} while (nbytes > 0);
-
-		err = skcipher_walk_done(&walk, tail);
-	}
-	return err;
-}
-
 #endif  /* _CRYPTO_CTR_H */