55c46040f6
For Montgomery keys, n_bits is actually the position of the highest bit and not the number of bits, which would be 1 more (fence vs posts). Rename the variable accordingly to lessen the confusion. No semantic change. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
103 lines
4 KiB
C
103 lines
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 "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_SECP224R1_ENABLED) || \
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defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \
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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_SHORT_WEIERSTRASS_ENABLED)
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/** Generate a private key on a short Weierstrass curve.
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*
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* The procedure complies with RFC 6979 §3.3 (deterministic ECDSA)
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* when the RNG is a suitably parametrized instance of HMAC_DRBG.
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*
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* \p N The upper bound of the range.
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* \p n_bits The size of \p N in bits. This value must be correct,
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* otherwise the result is unpredictable.
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* \param d A random number, uniformly generated in the range [1, N-1].
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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_sw( const mbedtls_mpi *N, 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_SHORT_WEIERSTRASS_ENABLED */
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#endif /* MBEDTLS_TEST_HOOKS && MBEDTLS_ECP_C */
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#endif /* MBEDTLS_ECP_INVASIVE_H */
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