187 lines
7.4 KiB
C
187 lines
7.4 KiB
C
/**
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* \file ecp_invasive.h
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*
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* \brief ECP module: interfaces for invasive testing only.
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*
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* The interfaces in this file are intended for testing purposes only.
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* They SHOULD NOT be made available in library integrations except when
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* building the library for testing.
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_ECP_INVASIVE_H
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#define MBEDTLS_ECP_INVASIVE_H
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#include "common.h"
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#include "mbedtls/bignum.h"
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#include "bignum_mod.h"
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#include "mbedtls/ecp.h"
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#if defined(MBEDTLS_TEST_HOOKS) && defined(MBEDTLS_ECP_C)
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#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
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/* Preconditions:
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* - bits is a multiple of 64 or is 224
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* - c is -1 or -2
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* - 0 <= N < 2^bits
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* - N has room for bits plus one limb
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*
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* Behavior:
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* Set N to c * 2^bits + old_value_of_N.
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*/
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void mbedtls_ecp_fix_negative(mbedtls_mpi *N, signed char c, size_t bits);
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#endif
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#if defined(MBEDTLS_ECP_MONTGOMERY_ENABLED)
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/** Generate a private key on a Montgomery curve (Curve25519 or Curve448).
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*
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* This function implements key generation for the set of secret keys
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* specified in [Curve25519] p. 5 and in [Curve448]. The resulting value
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* has the lower bits masked but is not necessarily canonical.
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*
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* \note - [Curve25519] http://cr.yp.to/ecdh/curve25519-20060209.pdf
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* - [RFC7748] https://tools.ietf.org/html/rfc7748
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*
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* \p high_bit The position of the high-order bit of the key to generate.
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* This is the bit-size of the key minus 1:
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* 254 for Curve25519 or 447 for Curve448.
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* \param d The randomly generated key. This is a number of size
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* exactly \p n_bits + 1 bits, with the least significant bits
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* masked as specified in [Curve25519] and in [RFC7748] §5.
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* \param f_rng The RNG function.
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* \param p_rng The RNG context to be passed to \p f_rng.
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*
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* \return \c 0 on success.
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* \return \c MBEDTLS_ERR_ECP_xxx or MBEDTLS_ERR_MPI_xxx on failure.
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*/
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int mbedtls_ecp_gen_privkey_mx(size_t n_bits,
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mbedtls_mpi *d,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng);
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#endif /* MBEDTLS_ECP_MONTGOMERY_ENABLED */
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#if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
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/** Fast quasi-reduction modulo p192 (FIPS 186-3 D.2.1)
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*
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* This operation expects a 384 bit MPI and the result of the reduction
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* is a 192 bit MPI.
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*
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* \param[in,out] Np The address of the MPI to be converted.
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* Must have twice as many limbs as the modulus.
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* Upon return this holds the reduced value. The bitlength
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* of the reduced value is the same as that of the modulus
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* (192 bits).
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* \param[in] Nn The length of \p Np in limbs.
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*/
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MBEDTLS_STATIC_TESTABLE
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int mbedtls_ecp_mod_p192_raw(mbedtls_mpi_uint *Np, size_t Nn);
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#endif /* MBEDTLS_ECP_DP_SECP192R1_ENABLED */
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#if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED)
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/** Fast quasi-reduction modulo p224 (FIPS 186-3 D.2.2)
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*
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* \param[in,out] X The address of the MPI to be converted.
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* Must have exact limb size that stores a 448-bit MPI
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* (double the bitlength of the modulus).
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* Upon return holds the reduced value which is
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* in range `0 <= X < 2 * N` (where N is the modulus).
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* The bitlength of the reduced value is the same as
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* that of the modulus (224 bits).
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* \param[in] X_limbs The length of \p X in limbs.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if \p X_limbs is not the
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* limb size that sores a 448-bit MPI.
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*/
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MBEDTLS_STATIC_TESTABLE
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int mbedtls_ecp_mod_p224_raw(mbedtls_mpi_uint *X, size_t X_limbs);
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#endif /* MBEDTLS_ECP_DP_SECP224R1_ENABLED */
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#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
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/** Fast quasi-reduction modulo p256 (FIPS 186-3 D.2.3)
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*
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* \param[in,out] X The address of the MPI to be converted.
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* Must have exact limb size that stores a 512-bit MPI
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* (double the bitlength of the modulus).
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* Upon return holds the reduced value which is
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* in range `0 <= X < 2 * N` (where N is the modulus).
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* The bitlength of the reduced value is the same as
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* that of the modulus (256 bits).
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* \param[in] X_limbs The length of \p X in limbs.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if \p X_limbs is not the
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* limb size that sores a 512-bit MPI.
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*/
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MBEDTLS_STATIC_TESTABLE
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int mbedtls_ecp_mod_p256_raw(mbedtls_mpi_uint *X, size_t X_limbs);
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#endif
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#if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
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/** Fast quasi-reduction modulo p521 = 2^521 - 1 (FIPS 186-3 D.2.5)
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*
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* \param[in,out] X The address of the MPI to be converted.
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* Must have twice as many limbs as the modulus
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* (the modulus is 521 bits long). Upon return this
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* holds the reduced value. The reduced value is
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* in range `0 <= X < 2 * N` (where N is the modulus).
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* and its the bitlength is one plus the bitlength
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* of the modulus.
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* \param[in] X_limbs The length of \p X in limbs.
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*
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* \return \c 0 on success.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if \p X_limbs does not have
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* twice as many limbs as the modulus.
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*/
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MBEDTLS_STATIC_TESTABLE
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int mbedtls_ecp_mod_p521_raw(mbedtls_mpi_uint *X, size_t X_limbs);
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#endif /* MBEDTLS_ECP_DP_SECP521R1_ENABLED */
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/** Initialise a modulus with hard-coded const curve data.
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*
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* \note The caller is responsible for the \p N modulus' memory.
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* mbedtls_mpi_mod_modulus_free(&N) should be invoked at the
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* end of its lifecycle.
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*
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* \param[in,out] N The address of the modulus structure to populate.
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* Must be initialized.
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* \param[in] id The mbedtls_ecp_group_id for which to initialise the modulus.
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* \param[in] ctype The mbedtls_ecp_curve_type identifier for a coordinate modulus (P)
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* or a scalar modulus (N).
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*
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* \return \c 0 if successful.
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* \return #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the given MPIs do not
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* have the correct number of limbs.
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*
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*/
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MBEDTLS_STATIC_TESTABLE
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int mbedtls_ecp_modulus_setup(mbedtls_mpi_mod_modulus *N,
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const mbedtls_ecp_group_id id,
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const mbedtls_ecp_curve_type ctype);
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#endif /* MBEDTLS_TEST_HOOKS && MBEDTLS_ECP_C */
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#endif /* MBEDTLS_ECP_INVASIVE_H */
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