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.
15 #include <crypto/engine.h>
18 * caam_priv_key_form - CAAM RSA private key representation
19 * CAAM RSA private key may have either of three forms.
21 * 1. The first representation consists of the pair (n, d), where the
22 * components have the following meanings:
24 * d the RSA private exponent
26 * 2. The second representation consists of the triplet (p, q, d), where the
27 * components have the following meanings:
28 * p the first prime factor of the RSA modulus n
29 * q the second prime factor of the RSA modulus n
30 * d the RSA private exponent
32 * 3. The third representation consists of the quintuple (p, q, dP, dQ, qInv),
33 * where the components have the following meanings:
34 * p the first prime factor of the RSA modulus n
35 * q the second prime factor of the RSA modulus n
36 * dP the first factors's CRT exponent
37 * dQ the second factors's CRT exponent
38 * qInv the (first) CRT coefficient
40 * The benefit of using the third or the second key form is lower computational
41 * cost for the decryption and signature operations.
43 enum caam_priv_key_form {
50 * caam_rsa_key - CAAM RSA key structure. Keys are allocated in DMA zone.
51 * @n : RSA modulus raw byte stream
52 * @e : RSA public exponent raw byte stream
53 * @d : RSA private exponent raw byte stream
54 * @p : RSA prime factor p of RSA modulus n
55 * @q : RSA prime factor q of RSA modulus n
56 * @dp : RSA CRT exponent of p
57 * @dp : RSA CRT exponent of q
58 * @qinv : RSA CRT coefficient
59 * @tmp1 : CAAM uses this temporary buffer as internal state buffer.
60 * It is assumed to be as long as p.
61 * @tmp2 : CAAM uses this temporary buffer as internal state buffer.
62 * It is assumed to be as long as q.
63 * @n_sz : length in bytes of RSA modulus n
64 * @e_sz : length in bytes of RSA public exponent
65 * @d_sz : length in bytes of RSA private exponent
66 * @p_sz : length in bytes of RSA prime factor p of RSA modulus n
67 * @q_sz : length in bytes of RSA prime factor q of RSA modulus n
68 * @priv_form : CAAM RSA private key representation
86 enum caam_priv_key_form priv_form;
90 * caam_rsa_ctx - per session context.
91 * @enginectx : crypto engine context
92 * @key : RSA key in DMA zone
93 * @dev : device structure
94 * @padding_dma : dma address of padding, for adding it to the input
97 struct crypto_engine_ctx enginectx;
98 struct caam_rsa_key key;
100 dma_addr_t padding_dma;
105 * caam_rsa_req_ctx - per request context.
106 * @src : input scatterlist (stripped of leading zeros)
107 * @fixup_src : input scatterlist (that might be stripped of leading zeros)
108 * @fixup_src_len : length of the fixup_src input scatterlist
109 * @edesc : s/w-extended rsa descriptor
110 * @akcipher_op_done : callback used when operation is done
112 struct caam_rsa_req_ctx {
113 struct scatterlist src[2];
114 struct scatterlist *fixup_src;
115 unsigned int fixup_src_len;
116 struct rsa_edesc *edesc;
117 void (*akcipher_op_done)(struct device *jrdev, u32 *desc, u32 err,
122 * rsa_edesc - s/w-extended rsa descriptor
123 * @src_nents : number of segments in input s/w scatterlist
124 * @dst_nents : number of segments in output s/w scatterlist
125 * @mapped_src_nents: number of segments in input h/w link table
126 * @mapped_dst_nents: number of segments in output h/w link table
127 * @sec4_sg_bytes : length of h/w link table
128 * @bklog : stored to determine if the request needs backlog
129 * @sec4_sg_dma : dma address of h/w link table
130 * @sec4_sg : pointer to h/w link table
131 * @pdb : specific RSA Protocol Data Block (PDB)
132 * @hw_desc : descriptor followed by link tables if any
137 int mapped_src_nents;
138 int mapped_dst_nents;
141 dma_addr_t sec4_sg_dma;
142 struct sec4_sg_entry *sec4_sg;
144 struct rsa_pub_pdb pub;
145 struct rsa_priv_f1_pdb priv_f1;
146 struct rsa_priv_f2_pdb priv_f2;
147 struct rsa_priv_f3_pdb priv_f3;
152 /* Descriptor construction primitives. */
153 void init_rsa_pub_desc(u32 *desc, struct rsa_pub_pdb *pdb);
154 void init_rsa_priv_f1_desc(u32 *desc, struct rsa_priv_f1_pdb *pdb);
155 void init_rsa_priv_f2_desc(u32 *desc, struct rsa_priv_f2_pdb *pdb);
156 void init_rsa_priv_f3_desc(u32 *desc, struct rsa_priv_f3_pdb *pdb);