From patchwork Thu Aug 29 23:27:53 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [3/3] crypto: omap-des: Add triple DES (des3_ede) support to driver From: Joel Fernandes X-Patchwork-Id: 2851679 Message-Id: <1377818873-21174-4-git-send-email-joelf@ti.com> To: Herbert Xu , "David S. Miller" , Mark Greer , Tony Lindgren , Lokesh Vutla Cc: Joel Fernandes , Linux OMAP List , Linux Kernel Mailing List , Linux ARM Kernel List , Linux Crypto Mailing List Date: Thu, 29 Aug 2013 18:27:53 -0500 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 --- 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, + } } };