1 /* SPDX-License-Identifier: GPL-2.0 */
3 * caam - Freescale FSL CAAM support for Public Key Cryptography descriptors
5 * Copyright 2016 Freescale Semiconductor, Inc.
7 * There is no Shared Descriptor for PKC so that the Job Descriptor must carry
8 * all the desired key parameters, input and output pointers.
17 * caam_priv_key_form - CAAM RSA private key representation
18 * CAAM RSA private key may have either of three forms.
20 * 1. The first representation consists of the pair (n, d), where the
21 * components have the following meanings:
23 * d the RSA private exponent
25 * 2. The second representation consists of the triplet (p, q, d), where the
26 * components have the following meanings:
27 * p the first prime factor of the RSA modulus n
28 * q the second prime factor of the RSA modulus n
29 * d the RSA private exponent
31 * 3. The third representation consists of the quintuple (p, q, dP, dQ, qInv),
32 * where the components have the following meanings:
33 * p the first prime factor of the RSA modulus n
34 * q the second prime factor of the RSA modulus n
35 * dP the first factors's CRT exponent
36 * dQ the second factors's CRT exponent
37 * qInv the (first) CRT coefficient
39 * The benefit of using the third or the second key form is lower computational
40 * cost for the decryption and signature operations.
42 enum caam_priv_key_form {
49 * caam_rsa_key - CAAM RSA key structure. Keys are allocated in DMA zone.
50 * @n : RSA modulus raw byte stream
51 * @e : RSA public exponent raw byte stream
52 * @d : RSA private exponent raw byte stream
53 * @p : RSA prime factor p of RSA modulus n
54 * @q : RSA prime factor q of RSA modulus n
55 * @dp : RSA CRT exponent of p
56 * @dp : RSA CRT exponent of q
57 * @qinv : RSA CRT coefficient
58 * @tmp1 : CAAM uses this temporary buffer as internal state buffer.
59 * It is assumed to be as long as p.
60 * @tmp2 : CAAM uses this temporary buffer as internal state buffer.
61 * It is assumed to be as long as q.
62 * @n_sz : length in bytes of RSA modulus n
63 * @e_sz : length in bytes of RSA public exponent
64 * @d_sz : length in bytes of RSA private exponent
65 * @p_sz : length in bytes of RSA prime factor p of RSA modulus n
66 * @q_sz : length in bytes of RSA prime factor q of RSA modulus n
67 * @priv_form : CAAM RSA private key representation
85 enum caam_priv_key_form priv_form;
89 * caam_rsa_ctx - per session context.
90 * @key : RSA key in DMA zone
91 * @dev : device structure
94 struct caam_rsa_key key;
99 * caam_rsa_req_ctx - per request context.
100 * @src: input scatterlist (stripped of leading zeros)
102 struct caam_rsa_req_ctx {
103 struct scatterlist src[2];
107 * rsa_edesc - s/w-extended rsa descriptor
108 * @src_nents : number of segments in input scatterlist
109 * @dst_nents : number of segments in output scatterlist
110 * @sec4_sg_bytes : length of h/w link table
111 * @sec4_sg_dma : dma address of h/w link table
112 * @sec4_sg : pointer to h/w link table
113 * @pdb : specific RSA Protocol Data Block (PDB)
114 * @hw_desc : descriptor followed by link tables if any
120 dma_addr_t sec4_sg_dma;
121 struct sec4_sg_entry *sec4_sg;
123 struct rsa_pub_pdb pub;
124 struct rsa_priv_f1_pdb priv_f1;
125 struct rsa_priv_f2_pdb priv_f2;
126 struct rsa_priv_f3_pdb priv_f3;
131 /* Descriptor construction primitives. */
132 void init_rsa_pub_desc(u32 *desc, struct rsa_pub_pdb *pdb);
133 void init_rsa_priv_f1_desc(u32 *desc, struct rsa_priv_f1_pdb *pdb);
134 void init_rsa_priv_f2_desc(u32 *desc, struct rsa_priv_f2_pdb *pdb);
135 void init_rsa_priv_f3_desc(u32 *desc, struct rsa_priv_f3_pdb *pdb);