Subject: [RFC PATCH 5/7] crypto: n2 - remove ecb(arc4) support

From: Ard Biesheuvel <[email-masked]>
Date: Thu, 2 Jul 2020 12:19:45 +0200

Signed-off-by: Ard Biesheuvel <[email-masked]>
---
 drivers/crypto/n2_core.c | 46 --------------------
 1 file changed, 46 deletions(-)

diff --git a/drivers/crypto/n2_core.c b/drivers/crypto/n2_core.c
index 6a828bbecea4..c347e58cd9a1 100644
--- a/drivers/crypto/n2_core.c
+++ b/drivers/crypto/n2_core.c
@@ -662,7 +662,6 @@ struct n2_skcipher_context {
 		u8		aes[AES_MAX_KEY_SIZE];
 		u8		des[DES_KEY_SIZE];
 		u8		des3[3 * DES_KEY_SIZE];
-		u8		arc4[258]; /* S-box, X, Y */
 	} key;
 };
 
@@ -789,36 +788,6 @@ static int n2_3des_setkey(struct crypto_skcipher *skcipher, const u8 *key,
 	return 0;
 }
 
-static int n2_arc4_setkey(struct crypto_skcipher *skcipher, const u8 *key,
-			  unsigned int keylen)
-{
-	struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
-	struct n2_skcipher_context *ctx = crypto_tfm_ctx(tfm);
-	struct n2_skcipher_alg *n2alg = n2_skcipher_alg(skcipher);
-	u8 *s = ctx->key.arc4;
-	u8 *x = s + 256;
-	u8 *y = x + 1;
-	int i, j, k;
-
-	ctx->enc_type = n2alg->enc_type;
-
-	j = k = 0;
-	*x = 0;
-	*y = 0;
-	for (i = 0; i < 256; i++)
-		s[i] = i;
-	for (i = 0; i < 256; i++) {
-		u8 a = s[i];
-		j = (j + key[k] + a) & 0xff;
-		s[i] = s[j];
-		s[j] = a;
-		if (++k >= keylen)
-			k = 0;
-	}
-
-	return 0;
-}
-
 static inline int skcipher_descriptor_len(int nbytes, unsigned int block_size)
 {
 	int this_len = nbytes;
@@ -1122,21 +1091,6 @@ struct n2_skcipher_tmpl {
 };
 
 static const struct n2_skcipher_tmpl skcipher_tmpls[] = {
-	/* ARC4: only ECB is supported (chaining bits ignored) */
-	{	.name		= "ecb(arc4)",
-		.drv_name	= "ecb-arc4",
-		.block_size	= 1,
-		.enc_type	= (ENC_TYPE_ALG_RC4_STREAM |
-				   ENC_TYPE_CHAINING_ECB),
-		.skcipher	= {
-			.min_keysize	= 1,
-			.max_keysize	= 256,
-			.setkey		= n2_arc4_setkey,
-			.encrypt	= n2_encrypt_ecb,
-			.decrypt	= n2_decrypt_ecb,
-		},
-	},
-
 	/* DES: ECB CBC and CFB are supported */
 	{	.name		= "ecb(des)",
 		.drv_name	= "ecb-des",
-- 
2.17.1