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/**
* \file pkwrite.h
*
* \brief Internal defines shared by the PK write module
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#ifndef MBEDTLS_PK_WRITE_H
#define MBEDTLS_PK_WRITE_H
#include "mbedtls/build_info.h"
#include "mbedtls/pk.h"
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa/crypto.h"
#endif /* MBEDTLS_USE_PSA_CRYPTO */
/*
* Max sizes of key per types. Shown as tag + len (+ content).
*/
#if defined(MBEDTLS_RSA_C)
/*
* RSA public keys:
* SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
* algorithm AlgorithmIdentifier, 1 + 1 (sequence)
* + 1 + 1 + 9 (rsa oid)
* + 1 + 1 (params null)
* subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
* RSAPublicKey ::= SEQUENCE { 1 + 3
* modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
* publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
* }
*/
#define MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES (38 + 2 * MBEDTLS_MPI_MAX_SIZE)
/*
* RSA private keys:
* RSAPrivateKey ::= SEQUENCE { 1 + 3
* version Version, 1 + 1 + 1
* modulus INTEGER, 1 + 3 + MPI_MAX + 1
* publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
* privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
* prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
* prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
* exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
* exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
* coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
* otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
* }
*/
#define MBEDTLS_MPI_MAX_SIZE_2 (MBEDTLS_MPI_MAX_SIZE / 2 + \
MBEDTLS_MPI_MAX_SIZE % 2)
#define MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES (47 + 3 * MBEDTLS_MPI_MAX_SIZE \
+ 5 * MBEDTLS_MPI_MAX_SIZE_2)
#else /* MBEDTLS_RSA_C */
#define MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES 0
#define MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES 0
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
/* Find the maximum number of bytes necessary to store an EC point. When USE_PSA
* is defined this means looking for the maximum between PSA and built-in
* supported curves. */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#define MBEDTLS_PK_MAX_ECC_BYTES (PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS) > \
MBEDTLS_ECP_MAX_BYTES ? \
PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS) : \
MBEDTLS_ECP_MAX_BYTES)
#else /* MBEDTLS_USE_PSA_CRYPTO */
#define MBEDTLS_PK_MAX_ECC_BYTES MBEDTLS_ECP_MAX_BYTES
#endif /* MBEDTLS_USE_PSA_CRYPTO */
/*
* EC public keys:
* SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
* algorithm AlgorithmIdentifier, 1 + 1 (sequence)
* + 1 + 1 + 7 (ec oid)
* + 1 + 1 + 9 (namedCurve oid)
* subjectPublicKey BIT STRING 1 + 2 + 1 [1]
* + 1 (point format) [1]
* + 2 * ECP_MAX (coords) [1]
* }
*/
#define MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES (30 + 2 * MBEDTLS_PK_MAX_ECC_BYTES)
/*
* EC private keys:
* ECPrivateKey ::= SEQUENCE { 1 + 2
* version INTEGER , 1 + 1 + 1
* privateKey OCTET STRING, 1 + 1 + ECP_MAX
* parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
* publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
* }
*/
#define MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES (29 + 3 * MBEDTLS_PK_MAX_ECC_BYTES)
#else /* MBEDTLS_PK_HAVE_ECC_KEYS */
#define MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES 0
#define MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES 0
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
#endif /* MBEDTLS_PK_WRITE_H */
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