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 <jo...@ti.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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