/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2013, Google Inc.
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*
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* (C) Copyright 2008 Semihalf
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*
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* (C) Copyright 2000-2006
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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#ifndef _RSA_H
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#define _RSA_H
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#include <errno.h>
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#include <image.h>
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/**
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* struct rsa_public_key - holder for a public key
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*
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* An RSA public key consists of a modulus (typically called N), the inverse
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* and R^2, where R is 2^(# key bits).
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*/
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struct rsa_public_key {
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uint len; /* len of modulus[] in number of uint32_t */
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uint32_t n0inv; /* -1 / modulus[0] mod 2^32 */
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uint32_t *modulus; /* modulus as little endian array */
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uint32_t *rr; /* R^2 as little endian array */
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uint64_t exponent; /* public exponent */
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};
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struct image_sign_info;
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#if IMAGE_ENABLE_SIGN
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/**
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* sign() - calculate and return signature for given input data
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*
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* @info: Specifies key and FIT information
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* @data: Pointer to the input data
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* @data_len: Data length
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* @sigp: Set to an allocated buffer holding the signature
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* @sig_len: Set to length of the calculated hash
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*
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* This computes input data signature according to selected algorithm.
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* Resulting signature value is placed in an allocated buffer, the
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* pointer is returned as *sigp. The length of the calculated
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* signature is returned via the sig_len pointer argument. The caller
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* should free *sigp.
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*
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* @return: 0, on success, -ve on error
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*/
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int rsa_sign(struct image_sign_info *info,
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const struct image_region region[],
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int region_count, uint8_t **sigp, uint *sig_len);
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/**
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* add_verify_data() - Add verification information to FDT
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*
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* Add public key information to the FDT node, suitable for
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* verification at run-time. The information added depends on the
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* algorithm being used.
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*
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* @info: Specifies key and FIT information
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* @keydest: Destination FDT blob for public key data
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* @return: 0, on success, -ENOSPC if the keydest FDT blob ran out of space,
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other -ve value on error
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*/
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int rsa_add_verify_data(struct image_sign_info *info, void *keydest);
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#else
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static inline int rsa_sign(struct image_sign_info *info,
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const struct image_region region[], int region_count,
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uint8_t **sigp, uint *sig_len)
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{
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return -ENXIO;
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}
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static inline int rsa_add_verify_data(struct image_sign_info *info,
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void *keydest)
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{
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return -ENXIO;
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}
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#endif
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#if IMAGE_ENABLE_VERIFY
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/**
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* rsa_verify() - Verify a signature against some data
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*
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* Verify a RSA PKCS1.5 signature against an expected hash.
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*
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* @info: Specifies key and FIT information
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* @data: Pointer to the input data
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* @data_len: Data length
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* @sig: Signature
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* @sig_len: Number of bytes in signature
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* @return 0 if verified, -ve on error
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*/
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int rsa_verify(struct image_sign_info *info,
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const struct image_region region[], int region_count,
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uint8_t *sig, uint sig_len);
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#else
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static inline int rsa_verify(struct image_sign_info *info,
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const struct image_region region[], int region_count,
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uint8_t *sig, uint sig_len)
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{
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return -ENXIO;
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}
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#endif
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#define RSA2048_BYTES (2048 / 8)
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#define RSA4096_BYTES (4096 / 8)
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/* This is the minimum/maximum key size we support, in bits */
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#define RSA_MIN_KEY_BITS 2048
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#define RSA_MAX_KEY_BITS 4096
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/* This is the maximum signature length that we support, in bits */
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#define RSA_MAX_SIG_BITS 4096
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#endif
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