rsa-mod-exp.h
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/*
* Copyright (c) 2014, Ruchika Gupta.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _RSA_MOD_EXP_H
#define _RSA_MOD_EXP_H
#include <errno.h>
#include <image.h>
/**
* struct key_prop - holder for a public key properties
*
* The struct has pointers to modulus (Typically called N),
* The inverse, R^2, exponent. These can be typecasted and
* used as byte arrays or converted to the required format
* as per requirement of RSA implementation.
*/
struct key_prop {
const void *rr; /* R^2 can be treated as byte array */
const void *modulus; /* modulus as byte array */
const void *public_exponent; /* public exponent as byte array */
uint32_t n0inv; /* -1 / modulus[0] mod 2^32 */
int num_bits; /* Key length in bits */
uint32_t exp_len; /* Exponent length in number of uint8_t */
};
/**
* rsa_mod_exp_sw() - Perform RSA Modular Exponentiation in sw
*
* Operation: out[] = sig ^ exponent % modulus
*
* @sig: RSA PKCS1.5 signature
* @sig_len: Length of signature in number of bytes
* @node: Node with RSA key elements like modulus, exponent, R^2, n0inv
* @out: Result in form of byte array of len equal to sig_len
*/
int rsa_mod_exp_sw(const uint8_t *sig, uint32_t sig_len,
struct key_prop *node, uint8_t *out);
int rsa_mod_exp(struct udevice *dev, const uint8_t *sig, uint32_t sig_len,
struct key_prop *node, uint8_t *out);
/**
* struct struct mod_exp_ops - Driver model for RSA Modular Exponentiation
* operations
*
* The uclass interface is implemented by all crypto devices which use
* driver model.
*/
struct mod_exp_ops {
/**
* Perform Modular Exponentiation
*
* Operation: out[] = sig ^ exponent % modulus
*
* @dev: RSA Device
* @sig: RSA PKCS1.5 signature
* @sig_len: Length of signature in number of bytes
* @node: Node with RSA key elements like modulus, exponent,
* R^2, n0inv
* @out: Result in form of byte array of len equal to sig_len
*
* This function computes exponentiation over the signature.
* Returns: 0 if exponentiation is successful, or a negative value
* if it wasn't.
*/
int (*mod_exp)(struct udevice *dev, const uint8_t *sig,
uint32_t sig_len, struct key_prop *node,
uint8_t *outp);
};
#endif