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902a07b5c8
For accessories without software-sync mechanism, add the option to do a RSA-based signature verification of the Read-Write firmware. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=samus BUG=chrome-os-partner:31192 TEST=enable the configuration on Fruitpie and see the RW firmware validated and jump to. Tried with good and bad RW images. Change-Id: I3c886c2cbe17ca9543e19bf8599061c3f9751d4f Reviewed-on: https://chromium-review.googlesource.com/229594 Reviewed-by: Todd Broch <tbroch@chromium.org> Commit-Queue: Todd Broch <tbroch@chromium.org> Tested-by: Todd Broch <tbroch@chromium.org>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef _INCLUDE_RSA_H
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#define _INCLUDE_RSA_H
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#include "config.h"
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#ifndef CONFIG_RSA_KEY_SIZE
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#define CONFIG_RSA_KEY_SIZE 2048 /* default to 2048-bit key length */
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#endif
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#define RSANUMBYTES ((CONFIG_RSA_KEY_SIZE)/8)
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#define RSANUMWORDS (RSANUMBYTES / sizeof(uint32_t))
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#ifdef CONFIG_RSA /* reserve space for public key only if used */
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/*
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* The size of the public key structure is
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* 2 x RSANUMBYTES for n and rr fields
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* plus 4 for n0inv, aligned on a multiple of 16
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* Put numerical constants here to please the linker script.
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*/
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#if CONFIG_RSA_KEY_SIZE == 2048
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#define RSA_PUBLIC_KEY_SIZE 528
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#elif CONFIG_RSA_KEY_SIZE == 4096
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#define RSA_PUBLIC_KEY_SIZE 1040
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#elif CONFIG_RSA_KEY_SIZE == 8192
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#define RSA_PUBLIC_KEY_SIZE 2064
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#else
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#error Unsupported RSA key size
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#endif
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#endif /* CONFIG_RSA */
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#ifndef __ASSEMBLER__
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#include "common.h"
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/* RSA public key definition */
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struct rsa_public_key {
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uint32_t n[RSANUMWORDS]; /* modulus as little endian array */
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uint32_t rr[RSANUMWORDS]; /* R^2 as little endian array */
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uint32_t n0inv; /* -1 / n[0] mod 2^32 */
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};
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int rsa_verify(const struct rsa_public_key *key,
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const uint8_t *signature,
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const uint8_t *sha,
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uint32_t *workbuf32);
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void check_rw_signature(void);
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#endif /* !__ASSEMBLER__ */
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#endif /* _INCLUDE_RSA_H */
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