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8a2a0dd35f
Sometimes the provided RSA input buffer provided is not stripped
of leading zeros. This could cause its size to be bigger than that
of the modulus, making the HW complain:
caam_jr 2142000.jr1: 40000789: DECO: desc idx 7:
Protocol Size Error - A protocol has seen an error in size. When
running RSA, pdb size N < (size of F) when no formatting is used; or
pdb size N < (F + 11) when formatting is used.
Fix the problem by stripping off the leading zero from input data
before feeding it to the CAAM accelerator.
Fixes: 8c419778ab ("crypto: caam - add support for RSA algorithm")
Cc: <stable@vger.kernel.org> # 4.8+
Reported-by: Martin Townsend <mtownsend1973@gmail.com>
Link: https://lkml.kernel.org/r/CABatt_ytYORYKtApcB4izhNanEKkGFi9XAQMjHi_n-8YWoCRiw@mail.gmail.com
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Tested-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* caam - Freescale FSL CAAM support for Public Key Cryptography descriptors
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*
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* Copyright 2016 Freescale Semiconductor, Inc.
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*
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* There is no Shared Descriptor for PKC so that the Job Descriptor must carry
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* all the desired key parameters, input and output pointers.
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*/
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#ifndef _PKC_DESC_H_
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#define _PKC_DESC_H_
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#include "compat.h"
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#include "pdb.h"
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/**
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* caam_priv_key_form - CAAM RSA private key representation
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* CAAM RSA private key may have either of three forms.
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*
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* 1. The first representation consists of the pair (n, d), where the
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* components have the following meanings:
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* n the RSA modulus
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* d the RSA private exponent
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*
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* 2. The second representation consists of the triplet (p, q, d), where the
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* components have the following meanings:
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* p the first prime factor of the RSA modulus n
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* q the second prime factor of the RSA modulus n
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* d the RSA private exponent
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*
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* 3. The third representation consists of the quintuple (p, q, dP, dQ, qInv),
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* where the components have the following meanings:
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* p the first prime factor of the RSA modulus n
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* q the second prime factor of the RSA modulus n
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* dP the first factors's CRT exponent
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* dQ the second factors's CRT exponent
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* qInv the (first) CRT coefficient
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*
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* The benefit of using the third or the second key form is lower computational
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* cost for the decryption and signature operations.
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*/
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enum caam_priv_key_form {
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FORM1,
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FORM2,
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FORM3
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};
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/**
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* caam_rsa_key - CAAM RSA key structure. Keys are allocated in DMA zone.
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* @n : RSA modulus raw byte stream
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* @e : RSA public exponent raw byte stream
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* @d : RSA private exponent raw byte stream
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* @p : RSA prime factor p of RSA modulus n
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* @q : RSA prime factor q of RSA modulus n
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* @dp : RSA CRT exponent of p
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* @dp : RSA CRT exponent of q
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* @qinv : RSA CRT coefficient
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* @tmp1 : CAAM uses this temporary buffer as internal state buffer.
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* It is assumed to be as long as p.
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* @tmp2 : CAAM uses this temporary buffer as internal state buffer.
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* It is assumed to be as long as q.
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* @n_sz : length in bytes of RSA modulus n
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* @e_sz : length in bytes of RSA public exponent
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* @d_sz : length in bytes of RSA private exponent
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* @p_sz : length in bytes of RSA prime factor p of RSA modulus n
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* @q_sz : length in bytes of RSA prime factor q of RSA modulus n
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* @priv_form : CAAM RSA private key representation
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*/
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struct caam_rsa_key {
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u8 *n;
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u8 *e;
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u8 *d;
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u8 *p;
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u8 *q;
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u8 *dp;
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u8 *dq;
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u8 *qinv;
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u8 *tmp1;
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u8 *tmp2;
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size_t n_sz;
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size_t e_sz;
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size_t d_sz;
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size_t p_sz;
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size_t q_sz;
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enum caam_priv_key_form priv_form;
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};
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/**
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* caam_rsa_ctx - per session context.
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* @key : RSA key in DMA zone
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* @dev : device structure
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*/
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struct caam_rsa_ctx {
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struct caam_rsa_key key;
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struct device *dev;
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};
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/**
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* caam_rsa_req_ctx - per request context.
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* @src: input scatterlist (stripped of leading zeros)
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*/
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struct caam_rsa_req_ctx {
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struct scatterlist src[2];
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};
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/**
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* rsa_edesc - s/w-extended rsa descriptor
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* @src_nents : number of segments in input scatterlist
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* @dst_nents : number of segments in output scatterlist
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* @sec4_sg_bytes : length of h/w link table
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* @sec4_sg_dma : dma address of h/w link table
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* @sec4_sg : pointer to h/w link table
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* @pdb : specific RSA Protocol Data Block (PDB)
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* @hw_desc : descriptor followed by link tables if any
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*/
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struct rsa_edesc {
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int src_nents;
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int dst_nents;
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int sec4_sg_bytes;
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dma_addr_t sec4_sg_dma;
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struct sec4_sg_entry *sec4_sg;
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union {
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struct rsa_pub_pdb pub;
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struct rsa_priv_f1_pdb priv_f1;
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struct rsa_priv_f2_pdb priv_f2;
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struct rsa_priv_f3_pdb priv_f3;
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} pdb;
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u32 hw_desc[];
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};
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/* Descriptor construction primitives. */
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void init_rsa_pub_desc(u32 *desc, struct rsa_pub_pdb *pdb);
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void init_rsa_priv_f1_desc(u32 *desc, struct rsa_priv_f1_pdb *pdb);
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void init_rsa_priv_f2_desc(u32 *desc, struct rsa_priv_f2_pdb *pdb);
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void init_rsa_priv_f3_desc(u32 *desc, struct rsa_priv_f3_pdb *pdb);
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#endif
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