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/* SPDX-License-Identifier: GPL-2.0 */
/*
* caam - Freescale FSL CAAM support for Public Key Cryptography descriptors
*
* Copyright 2016 Freescale Semiconductor, Inc.
*
* There is no Shared Descriptor for PKC so that the Job Descriptor must carry
* all the desired key parameters, input and output pointers.
*/
#ifndef _PKC_DESC_H_
#define _PKC_DESC_H_
#include "compat.h"
#include "pdb.h"
/**
* caam_priv_key_form - CAAM RSA private key representation
* CAAM RSA private key may have either of three 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
*
* 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.
*/
enum caam_priv_key_form {
FORM1,
FORM2,
FORM3
};
/**
* 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
* @dp : RSA CRT exponent of p
* @dp : RSA CRT exponent of q
* @qinv : RSA CRT coefficient
* @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 *dp;
u8 *dq;
u8 *qinv;
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;
};
/**
* caam_rsa_ctx - per session context.
* @key : RSA key in DMA zone
* @dev : device structure
* @padding_dma : dma address of padding, for adding it to the input
*/
struct caam_rsa_ctx {
struct caam_rsa_key key;
struct device *dev;
dma_addr_t padding_dma;
};
/**
* caam_rsa_req_ctx - per request context.
* @src : input scatterlist (stripped of leading zeros)
* @fixup_src : input scatterlist (that might be stripped of leading zeros)
* @fixup_src_len : length of the fixup_src input scatterlist
*/
struct caam_rsa_req_ctx {
struct scatterlist src[2];
struct scatterlist *fixup_src;
unsigned int fixup_src_len;
};
/**
* rsa_edesc - s/w-extended rsa descriptor
* @src_nents : number of segments in input s/w scatterlist
* @dst_nents : number of segments in output s/w scatterlist
* @mapped_src_nents: number of segments in input h/w link table
* @mapped_dst_nents: number of segments in output h/w link table
* @sec4_sg_bytes : length of h/w link table
* @sec4_sg_dma : dma address of h/w link table
* @sec4_sg : pointer to h/w link table
* @pdb : specific RSA Protocol Data Block (PDB)
* @hw_desc : descriptor followed by link tables if any
*/
struct rsa_edesc {
int src_nents;
int dst_nents;
int mapped_src_nents;
int mapped_dst_nents;
int sec4_sg_bytes;
dma_addr_t sec4_sg_dma;
struct sec4_sg_entry *sec4_sg;
union {
struct rsa_pub_pdb pub;
struct rsa_priv_f1_pdb priv_f1;
struct rsa_priv_f2_pdb priv_f2;
struct rsa_priv_f3_pdb priv_f3;
} pdb;
u32 hw_desc[];
};
/* 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);
void init_rsa_priv_f3_desc(u32 *desc, struct rsa_priv_f3_pdb *pdb);
#endif
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