crypto: caam - add support for RSA key form 2

CAAM RSA private key may have either of three representations.

1. The first representation consists of the pair (n, d), where the
   components have the following meanings:
      n      the RSA modulus
      d      the RSA private exponent

2. The second representation consists of the triplet (p, q, d), where
the
   components have the following meanings:
      p      the first prime factor of the RSA modulus n
      q      the second prime factor of the RSA modulus n
      d      the RSA private exponent

3. The third representation consists of the quintuple (p, q, dP, dQ,
qInv),
   where the components have the following meanings:
      p      the first prime factor of the RSA modulus n
      q      the second prime factor of the RSA modulus n
      dP     the first factors's CRT exponent
      dQ     the second factors's CRT exponent
      qInv   the (first) CRT coefficient

The benefit of using the third or the second key form is lower
computational cost for the decryption and signature operations.

This patch adds support for the second RSA private key
representation.

Signed-off-by: Tudor Ambarus <tudor-dan.ambarus@nxp.com>
Signed-off-by: Radu Alexe <radu.alexe@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/crypto/caam/caampkc.h b/drivers/crypto/caam/caampkc.h
index f595d159b112..48e408ceaf75 100644
--- a/drivers/crypto/caam/caampkc.h
+++ b/drivers/crypto/caam/caampkc.h
@@ -13,21 +13,57 @@
 #include "pdb.h"
 
 /**
+ * caam_priv_key_form - CAAM RSA private key representation
+ * CAAM RSA private key may have either of two forms.
+ *
+ * 1. The first representation consists of the pair (n, d), where the
+ *    components have the following meanings:
+ *        n      the RSA modulus
+ *        d      the RSA private exponent
+ *
+ * 2. The second representation consists of the triplet (p, q, d), where the
+ *    components have the following meanings:
+ *        p      the first prime factor of the RSA modulus n
+ *        q      the second prime factor of the RSA modulus n
+ *        d      the RSA private exponent
+ */
+enum caam_priv_key_form {
+	FORM1,
+	FORM2,
+};
+
+/**
  * caam_rsa_key - CAAM RSA key structure. Keys are allocated in DMA zone.
  * @n           : RSA modulus raw byte stream
  * @e           : RSA public exponent raw byte stream
  * @d           : RSA private exponent raw byte stream
+ * @p           : RSA prime factor p of RSA modulus n
+ * @q           : RSA prime factor q of RSA modulus n
+ * @tmp1        : CAAM uses this temporary buffer as internal state buffer.
+ *                It is assumed to be as long as p.
+ * @tmp2        : CAAM uses this temporary buffer as internal state buffer.
+ *                It is assumed to be as long as q.
  * @n_sz        : length in bytes of RSA modulus n
  * @e_sz        : length in bytes of RSA public exponent
  * @d_sz        : length in bytes of RSA private exponent
+ * @p_sz        : length in bytes of RSA prime factor p of RSA modulus n
+ * @q_sz        : length in bytes of RSA prime factor q of RSA modulus n
+ * @priv_form   : CAAM RSA private key representation
  */
 struct caam_rsa_key {
 	u8 *n;
 	u8 *e;
 	u8 *d;
+	u8 *p;
+	u8 *q;
+	u8 *tmp1;
+	u8 *tmp2;
 	size_t n_sz;
 	size_t e_sz;
 	size_t d_sz;
+	size_t p_sz;
+	size_t q_sz;
+	enum caam_priv_key_form priv_form;
 };
 
 /**
@@ -59,6 +95,7 @@ struct rsa_edesc {
 	union {
 		struct rsa_pub_pdb pub;
 		struct rsa_priv_f1_pdb priv_f1;
+		struct rsa_priv_f2_pdb priv_f2;
 	} pdb;
 	u32 hw_desc[];
 };
@@ -66,5 +103,6 @@ struct rsa_edesc {
 /* Descriptor construction primitives. */
 void init_rsa_pub_desc(u32 *desc, struct rsa_pub_pdb *pdb);
 void init_rsa_priv_f1_desc(u32 *desc, struct rsa_priv_f1_pdb *pdb);
+void init_rsa_priv_f2_desc(u32 *desc, struct rsa_priv_f2_pdb *pdb);
 
 #endif