mirror of
https://github.com/DarkMatterCore/nxdumptool.git
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f526d4e6f4
* Implemented RSA-2048-PSS + SHA256 signature verification. * Refactored RSA-2048-OAEP decryption steps to use mbedtls function calls. * Implemented NCA header main signature verification. * Replaced Björn Samuelsson's CRC32 algorithm with the hardware accelerated CRC32 checksum calculation from libnx (latest commit with support for calculation in blocks).
63 lines
2.7 KiB
C
63 lines
2.7 KiB
C
/*
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* rsa.c
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*
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* Copyright (c) 2018-2019, SciresM.
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* Copyright (c) 2018-2019, The-4n.
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* Copyright (c) 2020-2021, DarkMatterCore <pabloacurielz@gmail.com>.
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*
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* This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool).
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*
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* nxdumptool is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* nxdumptool is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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#ifndef __RSA_H__
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#define __RSA_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RSA2048_BYTES 0x100
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#define RSA2048_BITS (RSA2048_BYTES * 8)
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#define RSA2048_SIG_SIZE RSA2048_BYTES
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#define RSA2048_PUBKEY_SIZE RSA2048_BYTES
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/// Returns a pointer to the RSA-2048 public key that can be used to verify signatures generated by rsa2048GenerateSha256BasedPssSignature().
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/// Suitable to replace the ACID public key in a NPDM.
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const u8 *rsa2048GetCustomPublicKey(void);
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/// Verifies a RSA-2048-PSS with SHA-256 signature.
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/// The provided signature and modulus should have sizes of at least RSA2048_SIG_SIZE and RSA2048_PUBKEY_SIZE, respectively.
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bool rsa2048VerifySha256BasedPssSignature(const void *data, size_t data_size, const void *signature, const void *modulus, const void *public_exponent, size_t public_exponent_size);
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/// Generates a RSA-2048-PSS with SHA-256 signature using a custom RSA-2048 private key.
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/// Suitable to replace the ACID signature in a Program NCA header.
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/// Destination buffer size should be at least RSA2048_SIG_SIZE.
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bool rsa2048GenerateSha256BasedPssSignature(void *dst, const void *src, size_t size);
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/// Performs RSA-2048-OAEP decryption.
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/// Suitable to decrypt the titlekey block from tickets with personalized crypto.
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/// The provided signature and modulus should have sizes of at least RSA2048_SIG_SIZE and RSA2048_PUBKEY_SIZE, respectively.
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/// The label and label_size arguments are optional - these may be set to NULL and 0 if not needed, respectively.
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bool rsa2048OaepDecrypt(void *dst, size_t dst_size, const void *signature, const void *modulus, const void *public_exponent, size_t public_exponent_size, const void *private_exponent, \
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size_t private_exponent_size, const void *label, size_t label_size, size_t *out_size);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __RSA_H__ */
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