linux-kernel - [PATCH 3/3] crypto: omap-des: Add triple DES (des3

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Date:	Thu, 29 Aug 2013 18:27:53 -0500
From:	Joel Fernandes <joelf@...com>
To:	Herbert Xu <herbert@...dor.hengli.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	Mark Greer <mgreer@...malcreek.com>,
	Tony Lindgren <tony@...mide.com>,
	Lokesh Vutla <lokeshvutla@...com>
CC:	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
	Joel Fernandes <joelf@...com>
Subject: [PATCH 3/3] crypto: omap-des: Add triple DES (des3_ede) support to driver

OMAP DES module supports 3DES operation where 3 64-bit keys are used to
perform a DES encrypt-decrypt-encrypt (ede) operation on a buffer.

Signed-off-by: Joel Fernandes <joelf@...com>
---
 drivers/crypto/omap-des.c | 53 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 50 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
index 6a9a25f..0df60cb 100644
--- a/drivers/crypto/omap-des.c
+++ b/drivers/crypto/omap-des.c
@@ -83,7 +83,7 @@ struct omap_des_ctx {
 	struct omap_des_dev *dd;
 
 	int		keylen;
-	u32		key[DES_KEY_SIZE / sizeof(u32)];
+	u32		key[(3 * DES_KEY_SIZE) / sizeof(u32)];
 	unsigned long	flags;
 };
 
@@ -265,8 +265,10 @@ static int omap_des_write_ctrl(struct omap_des_dev *dd)
 		val |= DES_REG_CTRL_CBC;
 	if (dd->flags & FLAGS_ENCRYPT)
 		val |= DES_REG_CTRL_DIRECTION;
+	if (key32 == 6)
+		val |= DES_REG_CTRL_TDES;
 
-	mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION;
+	mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION | DES_REG_CTRL_TDES;
 
 	omap_des_write_mask(dd, DES_REG_CTRL(dd), val, mask);
 
@@ -725,7 +727,7 @@ static int omap_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
 {
 	struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(tfm);
 
-	if (keylen != DES_KEY_SIZE)
+	if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE))
 		return -EINVAL;
 
 	pr_debug("enter, keylen: %d\n", keylen);
@@ -817,6 +819,51 @@ static struct crypto_alg algs_ecb_cbc[] = {
 		.encrypt	= omap_des_cbc_encrypt,
 		.decrypt	= omap_des_cbc_decrypt,
 	}
+},
+{
+	.cra_name		= "ecb(des3_ede)",
+	.cra_driver_name	= "ecb-des3-omap",
+	.cra_priority		= 100,
+	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER |
+				  CRYPTO_ALG_KERN_DRIVER_ONLY |
+				  CRYPTO_ALG_ASYNC,
+	.cra_blocksize		= DES_BLOCK_SIZE,
+	.cra_ctxsize		= sizeof(struct omap_des_ctx),
+	.cra_alignmask		= 0,
+	.cra_type		= &crypto_ablkcipher_type,
+	.cra_module		= THIS_MODULE,
+	.cra_init		= omap_des_cra_init,
+	.cra_exit		= omap_des_cra_exit,
+	.cra_u.ablkcipher = {
+		.min_keysize	= 3*DES_KEY_SIZE,
+		.max_keysize	= 3*DES_KEY_SIZE,
+		.setkey		= omap_des_setkey,
+		.encrypt	= omap_des_ecb_encrypt,
+		.decrypt	= omap_des_ecb_decrypt,
+	}
+},
+{
+	.cra_name		= "cbc(des3_ede)",
+	.cra_driver_name	= "cbc-des3-omap",
+	.cra_priority		= 100,
+	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER |
+				  CRYPTO_ALG_KERN_DRIVER_ONLY |
+				  CRYPTO_ALG_ASYNC,
+	.cra_blocksize		= DES_BLOCK_SIZE,
+	.cra_ctxsize		= sizeof(struct omap_des_ctx),
+	.cra_alignmask		= 0,
+	.cra_type		= &crypto_ablkcipher_type,
+	.cra_module		= THIS_MODULE,
+	.cra_init		= omap_des_cra_init,
+	.cra_exit		= omap_des_cra_exit,
+	.cra_u.ablkcipher = {
+		.min_keysize	= 3*DES_KEY_SIZE,
+		.max_keysize	= 3*DES_KEY_SIZE,
+		.ivsize		= DES_BLOCK_SIZE,
+		.setkey		= omap_des_setkey,
+		.encrypt	= omap_des_cbc_encrypt,
+		.decrypt	= omap_des_cbc_decrypt,
+	}
 }
 };
 
-- 
1.8.1.2

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