1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * caam - Freescale FSL CAAM support for Public Key Cryptography descriptors 4 * 5 * Copyright 2016 Freescale Semiconductor, Inc. 6 * 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. 9 */ 10 11 #ifndef _PKC_DESC_H_ 12 #define _PKC_DESC_H_ 13 #include "compat.h" 14 #include "pdb.h" 15 16 /** 17 * caam_priv_key_form - CAAM RSA private key representation 18 * CAAM RSA private key may have either of three forms. 19 * 20 * 1. The first representation consists of the pair (n, d), where the 21 * components have the following meanings: 22 * n the RSA modulus 23 * d the RSA private exponent 24 * 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 30 * 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 38 * 39 * The benefit of using the third or the second key form is lower computational 40 * cost for the decryption and signature operations. 41 */ 42 enum caam_priv_key_form { 43 FORM1, 44 FORM2, 45 FORM3 46 }; 47 48 /** 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 68 */ 69 struct caam_rsa_key { 70 u8 *n; 71 u8 *e; 72 u8 *d; 73 u8 *p; 74 u8 *q; 75 u8 *dp; 76 u8 *dq; 77 u8 *qinv; 78 u8 *tmp1; 79 u8 *tmp2; 80 size_t n_sz; 81 size_t e_sz; 82 size_t d_sz; 83 size_t p_sz; 84 size_t q_sz; 85 enum caam_priv_key_form priv_form; 86 }; 87 88 /** 89 * caam_rsa_ctx - per session context. 90 * @key : RSA key in DMA zone 91 * @dev : device structure 92 * @padding_dma : dma address of padding, for adding it to the input 93 */ 94 struct caam_rsa_ctx { 95 struct caam_rsa_key key; 96 struct device *dev; 97 dma_addr_t padding_dma; 98 99 }; 100 101 /** 102 * caam_rsa_req_ctx - per request context. 103 * @src : input scatterlist (stripped of leading zeros) 104 * @fixup_src : input scatterlist (that might be stripped of leading zeros) 105 * @fixup_src_len : length of the fixup_src input scatterlist 106 */ 107 struct caam_rsa_req_ctx { 108 struct scatterlist src[2]; 109 struct scatterlist *fixup_src; 110 unsigned int fixup_src_len; 111 }; 112 113 /** 114 * rsa_edesc - s/w-extended rsa descriptor 115 * @src_nents : number of segments in input scatterlist 116 * @dst_nents : number of segments in output scatterlist 117 * @sec4_sg_bytes : length of h/w link table 118 * @sec4_sg_dma : dma address of h/w link table 119 * @sec4_sg : pointer to h/w link table 120 * @pdb : specific RSA Protocol Data Block (PDB) 121 * @hw_desc : descriptor followed by link tables if any 122 */ 123 struct rsa_edesc { 124 int src_nents; 125 int dst_nents; 126 int sec4_sg_bytes; 127 dma_addr_t sec4_sg_dma; 128 struct sec4_sg_entry *sec4_sg; 129 union { 130 struct rsa_pub_pdb pub; 131 struct rsa_priv_f1_pdb priv_f1; 132 struct rsa_priv_f2_pdb priv_f2; 133 struct rsa_priv_f3_pdb priv_f3; 134 } pdb; 135 u32 hw_desc[]; 136 }; 137 138 /* Descriptor construction primitives. */ 139 void init_rsa_pub_desc(u32 *desc, struct rsa_pub_pdb *pdb); 140 void init_rsa_priv_f1_desc(u32 *desc, struct rsa_priv_f1_pdb *pdb); 141 void init_rsa_priv_f2_desc(u32 *desc, struct rsa_priv_f2_pdb *pdb); 142 void init_rsa_priv_f3_desc(u32 *desc, struct rsa_priv_f3_pdb *pdb); 143 144 #endif 145