/* 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
* @ edesc : s / w - extended rsa descriptor
* @ akcipher_op_done : callback used when operation is done
*/
struct caam_rsa_req_ctx {
struct scatterlist src[2 ];
struct scatterlist *fixup_src;
unsigned int fixup_src_len;
struct rsa_edesc *edesc;
void (*akcipher_op_done)(struct device *jrdev, u32 *desc, u32 err,
void *context);
};
/**
* 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
* @ bklog : stored to determine if the request needs backlog
* @ 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;
bool bklog;
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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