crypto: inside-secure - Added AES-CFB support

This patch adds support for AES in 128 bit cipher feedback mode (AES-CFB).

Signed-off-by: Pascal van Leeuwen <pvanleeuwen@verimatrix.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 39 insertions, 0 deletions

diff --git a/drivers/crypto/inside-secure/safexcel.c b/drivers/crypto/inside-secure/safexcel.c
index 46cdcbeb122b..3196cb30e1b5 100644
--- a/drivers/crypto/inside-secure/safexcel.c
+++ b/drivers/crypto/inside-secure/safexcel.c
@@ -981,6 +981,7 @@ static struct safexcel_alg_template *safexcel_algs[] = {
         &safexcel_alg_cbc_des3_ede,
         &safexcel_alg_ecb_aes,
         &safexcel_alg_cbc_aes,
+        &safexcel_alg_cfb_aes,
         &safexcel_alg_ctr_aes,
         &safexcel_alg_md5,
         &safexcel_alg_sha1,
diff --git a/drivers/crypto/inside-secure/safexcel.h b/drivers/crypto/inside-secure/safexcel.h
index c6f93ec88c84..6f781ed1f0a5 100644
--- a/drivers/crypto/inside-secure/safexcel.h
+++ b/drivers/crypto/inside-secure/safexcel.h
@@ -336,6 +336,7 @@ struct safexcel_context_record {
 /* control1 */
 #define CONTEXT_CONTROL_CRYPTO_MODE_ECB         (0 << 0)
 #define CONTEXT_CONTROL_CRYPTO_MODE_CBC         (1 << 0)
+#define CONTEXT_CONTROL_CRYPTO_MODE_CFB         (5 << 0)
 #define CONTEXT_CONTROL_CRYPTO_MODE_CTR_LOAD    (6 << 0)
 #define CONTEXT_CONTROL_CRYPTO_MODE_XTS         (7 << 0)
 #define CONTEXT_CONTROL_CRYPTO_MODE_XCM         ((6 << 0) | BIT(17))
@@ -767,6 +768,7 @@ extern struct safexcel_alg_template safexcel_alg_ecb_des3_ede;
 extern struct safexcel_alg_template safexcel_alg_cbc_des3_ede;
 extern struct safexcel_alg_template safexcel_alg_ecb_aes;
 extern struct safexcel_alg_template safexcel_alg_cbc_aes;
+extern struct safexcel_alg_template safexcel_alg_cfb_aes;
 extern struct safexcel_alg_template safexcel_alg_ctr_aes;
 extern struct safexcel_alg_template safexcel_alg_md5;
 extern struct safexcel_alg_template safexcel_alg_sha1;
diff --git a/drivers/crypto/inside-secure/safexcel_cipher.c b/drivers/crypto/inside-secure/safexcel_cipher.c
index 7091b6086e2e..4e06c61f9ff9 100644
--- a/drivers/crypto/inside-secure/safexcel_cipher.c
+++ b/drivers/crypto/inside-secure/safexcel_cipher.c
@@ -1136,6 +1136,42 @@ struct safexcel_alg_template safexcel_alg_cbc_aes = {
         },
 };
 
+static int safexcel_skcipher_aes_cfb_cra_init(struct crypto_tfm *tfm)
+{
+        struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
+
+        safexcel_skcipher_cra_init(tfm);
+        ctx->alg  = SAFEXCEL_AES;
+        ctx->mode = CONTEXT_CONTROL_CRYPTO_MODE_CFB;
+        return 0;
+}
+
+struct safexcel_alg_template safexcel_alg_cfb_aes = {
+        .type = SAFEXCEL_ALG_TYPE_SKCIPHER,
+        .algo_mask = SAFEXCEL_ALG_AES | SAFEXCEL_ALG_AES_XFB,
+        .alg.skcipher = {
+                .setkey = safexcel_skcipher_aes_setkey,
+                .encrypt = safexcel_encrypt,
+                .decrypt = safexcel_decrypt,
+                .min_keysize = AES_MIN_KEY_SIZE,
+                .max_keysize = AES_MAX_KEY_SIZE,
+                .ivsize = AES_BLOCK_SIZE,
+                .base = {
+                        .cra_name = "cfb(aes)",
+                        .cra_driver_name = "safexcel-cfb-aes",
+                        .cra_priority = SAFEXCEL_CRA_PRIORITY,
+                        .cra_flags = CRYPTO_ALG_ASYNC |
+                                     CRYPTO_ALG_KERN_DRIVER_ONLY,
+                        .cra_blocksize = 1,
+                        .cra_ctxsize = sizeof(struct safexcel_cipher_ctx),
+                        .cra_alignmask = 0,
+                        .cra_init = safexcel_skcipher_aes_cfb_cra_init,
+                        .cra_exit = safexcel_skcipher_cra_exit,
+                        .cra_module = THIS_MODULE,
+                },
+        },
+};
+
 static int safexcel_skcipher_aesctr_setkey(struct crypto_skcipher *ctfm,
                                            const u8 *key, unsigned int len)
 {