Add support for AES algorithm in ECB Mode. Data encryption modes
are supported via MCE engine (programmable mode control engine).
ECB (Electronic code book) is a mode of operation for a block cipher,
with the characteristic that each possible block of plaintext has a
defined corresponding ciphertext value and vice versa. In other words,
the same plaintext value will always result in the same ciphertext value.
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
---
drivers/crypto/sa2ul.c | 76 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/drivers/crypto/sa2ul.c b/drivers/crypto/sa2ul.c
index 64bdf6b2b879..a17c1f66c5c1 100644
--- a/drivers/crypto/sa2ul.c
+++ b/drivers/crypto/sa2ul.c
@@ -178,6 +178,38 @@ static u8 mci_cbc_dec_array[3][MODE_CONTROL_BYTES] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
};
+/*
+ * Mode Control Instructions for various Key lengths 128, 192, 256
+ * For ECB (Electronic Code Book) mode for encryption
+ */
+static u8 mci_ecb_enc_array[3][27] = {
+ { 0x21, 0x00, 0x00, 0x80, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+ { 0x21, 0x00, 0x00, 0x84, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+ { 0x21, 0x00, 0x00, 0x88, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+};
+
+/*
+ * Mode Control Instructions for various Key lengths 128, 192, 256
+ * For ECB (Electronic Code Book) mode for decryption
+ */
+static u8 mci_ecb_dec_array[3][27] = {
+ { 0x31, 0x00, 0x00, 0x80, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+ { 0x31, 0x00, 0x00, 0x84, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+ { 0x31, 0x00, 0x00, 0x88, 0x8a, 0x04, 0xb7, 0x90, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
+};
+
/*
* Perform 16 byte or 128 bit swizzling
* The SA2UL Expects the security context to
@@ -746,6 +778,26 @@ static int sa_aes_cbc_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
return sa_aes_setkey(tfm, key, keylen, ad);
}
+static int sa_aes_ecb_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct algo_data *ad = kzalloc(sizeof(*ad), GFP_KERNEL);
+ /* Convert the key size (16/24/32) to the key size index (0/1/2) */
+ int key_idx = (keylen >> 3) - 2;
+
+ ad->enc_eng.eng_id = SA_ENG_ID_EM1;
+ ad->enc_eng.sc_size = SA_CTX_ENC_TYPE1_SZ;
+ ad->auth_eng.eng_id = SA_ENG_ID_NONE;
+ ad->auth_eng.sc_size = 0;
+ ad->mci_enc = mci_ecb_enc_array[key_idx];
+ ad->mci_dec = mci_ecb_dec_array[key_idx];
+ ad->inv_key = true;
+ ad->ealg_id = SA_EALG_ID_AES_ECB;
+ ad->aalg_id = SA_AALG_ID_NONE;
+
+ return sa_aes_setkey(tfm, key, keylen, ad);
+}
+
static void sa_aes_dma_in_callback(void *data)
{
struct sa_rx_data *rxd = (struct sa_rx_data *)data;
@@ -940,6 +992,30 @@ static struct sa_alg_tmpl sa_algs[] = {
}
}
},
+ { .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
+ .alg.crypto = {
+ .cra_name = "ecb(aes)",
+ .cra_driver_name = "ecb-aes-sa2ul",
+ .cra_priority = 30000,
+ .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = AES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct sa_tfm_ctx),
+ .cra_alignmask = 0,
+ .cra_type = &crypto_ablkcipher_type,
+ .cra_module = THIS_MODULE,
+ .cra_init = sa_aes_cra_init,
+ .cra_exit = sa_aes_cra_exit,
+ .cra_u.ablkcipher = {
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .setkey = sa_aes_ecb_setkey,
+ .encrypt = sa_aes_cbc_encrypt,
+ .decrypt = sa_aes_cbc_decrypt,
+ }
+ }
+ },
};
/* Register the algorithms in crypto framework */
--
2.17.1
