mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-29 22:24:16 +01:00
Apply feedback to ECP internal interface documentation
This commit is contained in:
Janos Follath
Simon Butcher
parent
aab9efb4ce
commit
5634b8609b
@ -25,12 +25,8 @@
|
||||
/*
|
||||
* References:
|
||||
*
|
||||
* SEC1 http://www.secg.org/index.php?action=secg,docs_secg
|
||||
* GECC = Guide to Elliptic Curve Cryptography - Hankerson, Menezes, Vanstone
|
||||
* FIPS 186-3 http://csrc.nist.gov/publications/fips/fips186-3/fips_186-3.pdf
|
||||
* RFC 4492 for the related TLS structures and constants
|
||||
*
|
||||
* [Curve25519] http://cr.yp.to/ecdh/curve25519-20060209.pdf
|
||||
* [1] BERNSTEIN, Daniel J. Curve25519: new Diffie-Hellman speed records.
|
||||
* <http://cr.yp.to/ecdh/curve25519-20060209.pdf>
|
||||
*
|
||||
* [2] CORON, Jean-S'ebastien. Resistance against differential power analysis
|
||||
* for elliptic curve cryptosystems. In : Cryptographic Hardware and
|
||||
@ -41,6 +37,24 @@
|
||||
* render ECC resistant against Side Channel Attacks. IACR Cryptology
|
||||
* ePrint Archive, 2004, vol. 2004, p. 342.
|
||||
* <http://eprint.iacr.org/2004/342.pdf>
|
||||
*
|
||||
* [4] Certicom Research. SEC 2: Recommended Elliptic Curve Domain Parameters.
|
||||
* <http://www.secg.org/sec2-v2.pdf>
|
||||
*
|
||||
* [5] HANKERSON, Darrel, MENEZES, Alfred J., VANSTONE, Scott. Guide to Elliptic
|
||||
* Curve Cryptography.
|
||||
*
|
||||
* [6] Digital Signature Standard (DSS), FIPS 186-4.
|
||||
* <http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf>
|
||||
*
|
||||
* [7] Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer
|
||||
* Security (TLS), RFC 4492.
|
||||
* <https://tools.ietf.org/search/rfc4492>
|
||||
*
|
||||
* [8] <http://www.hyperelliptic.org/EFD/g1p/auto-shortw-jacobian.html>
|
||||
*
|
||||
* [9] COHEN, Henri. A Course in Computational Algebraic Number Theory.
|
||||
* Springer Science & Business Media, 1 Aug 2000
|
||||
*/
|
||||
|
||||
#ifndef MBEDTLS_ECP_INTERNAL_H
|
||||
@ -49,22 +63,27 @@
|
||||
#if defined(MBEDTLS_ECP_INTERNAL_ALT)
|
||||
|
||||
/**
|
||||
* \brief Tell if the cryptographic hardware can handle the group.
|
||||
* \brief Indicate if the Elliptic Curve Point module extension can
|
||||
* handle the group.
|
||||
*
|
||||
* \param grp The pointer to the group.
|
||||
* \param grp The pointer to the elliptic curve group that will be the
|
||||
* basis of the cryptographic computations.
|
||||
*
|
||||
* \return Non-zero if successful.
|
||||
*/
|
||||
unsigned char mbedtls_internal_ecp_grp_capable( const mbedtls_ecp_group *grp );
|
||||
|
||||
/**
|
||||
* \brief Initialise the crypto hardware accelerator.
|
||||
* \brief Initialise the Elliptic Curve Point module extension.
|
||||
*
|
||||
* If mbedtls_internal_ecp_grp_capable returns true for a
|
||||
* group, this function has to be able to initialise the
|
||||
* hardware for it.
|
||||
* module for it.
|
||||
*
|
||||
* \param grp The pointer to the group the hardware needs to be
|
||||
* This module can be a driver to a crypto hardware
|
||||
* accelerator, for which this could be an initialise function.
|
||||
*
|
||||
* \param grp The pointer to the group the module needs to be
|
||||
* initialised for.
|
||||
*
|
||||
* \return 0 if successful.
|
||||
@ -72,10 +91,10 @@ unsigned char mbedtls_internal_ecp_grp_capable( const mbedtls_ecp_group *grp );
|
||||
int mbedtls_internal_ecp_init( const mbedtls_ecp_group *grp );
|
||||
|
||||
/**
|
||||
* \brief Reset the crypto hardware accelerator to an uninitialised
|
||||
* state.
|
||||
* \brief Frees and deallocates the Elliptic Curve Point module
|
||||
* extension.
|
||||
*
|
||||
* \param grp The pointer to the group the hardware was initialised for.
|
||||
* \param grp The pointer to the group the module was initialised for.
|
||||
*/
|
||||
void mbedtls_internal_ecp_free( const mbedtls_ecp_group *grp );
|
||||
|
||||
@ -86,9 +105,6 @@ void mbedtls_internal_ecp_free( const mbedtls_ecp_group *grp );
|
||||
* \brief Randomize jacobian coordinates:
|
||||
* (X, Y, Z) -> (l^2 X, l^3 Y, l Z) for random l.
|
||||
*
|
||||
* This is sort of the reverse operation of
|
||||
* ecp_normalize_jac().
|
||||
*
|
||||
* \param grp Pointer to the group representing the curve.
|
||||
*
|
||||
* \param pt The point on the curve to be randomised, given with Jacobian
|
||||
@ -112,6 +128,9 @@ int mbedtls_internal_ecp_randomize_jac( const mbedtls_ecp_group *grp,
|
||||
* The coordinates of Q must be normalized (= affine),
|
||||
* but those of P don't need to. R is not normalized.
|
||||
*
|
||||
* This function is used only as a subrutine of
|
||||
* ecp_mul_comb().
|
||||
*
|
||||
* Special cases: (1) P or Q is zero, (2) R is zero,
|
||||
* (3) P == Q.
|
||||
* None of these cases can happen as intermediate step in
|
||||
@ -127,7 +146,7 @@ int mbedtls_internal_ecp_randomize_jac( const mbedtls_ecp_group *grp,
|
||||
* We accept Q->Z being unset (saving memory in tables) as
|
||||
* meaning 1.
|
||||
*
|
||||
* Cost in field operations if done by GECC 3.22:
|
||||
* Cost in field operations if done by [5] 3.22:
|
||||
* 1A := 8M + 3S
|
||||
*
|
||||
* \param grp Pointer to the group representing the curve.
|
||||
@ -153,11 +172,9 @@ int mbedtls_internal_ecp_add_mixed( const mbedtls_ecp_group *grp,
|
||||
* Cost: 1D := 3M + 4S (A == 0)
|
||||
* 4M + 4S (A == -3)
|
||||
* 3M + 6S + 1a otherwise
|
||||
* when the implementation is based on
|
||||
* http://www.hyperelliptic.org/EFD/g1p/
|
||||
* auto-shortw-jacobian.html#doubling-dbl-1998-cmo-2
|
||||
* and standard optimizations are applied when curve parameter
|
||||
* A is one of { 0, -3 }.
|
||||
* when the implementation is based on the "dbl-1998-cmo-2"
|
||||
* doubling formulas in [8] and standard optimizations are
|
||||
* applied when curve parameter A is one of { 0, -3 }.
|
||||
*
|
||||
* \param grp Pointer to the group representing the curve.
|
||||
*
|
||||
@ -180,8 +197,10 @@ int mbedtls_internal_ecp_double_jac( const mbedtls_ecp_group *grp,
|
||||
* Using Montgomery's trick to perform only one inversion mod P
|
||||
* the cost is:
|
||||
* 1N(t) := 1I + (6t - 3)M + 1S
|
||||
* (See for example Cohen's "A Course in Computational
|
||||
* Algebraic Number Theory", Algorithm 10.3.4.)
|
||||
* (See for example Algorithm 10.3.4. in [9])
|
||||
*
|
||||
* This function is used only as a subrutine of
|
||||
* ecp_mul_comb().
|
||||
*
|
||||
* Warning: fails (returning an error) if one of the points is
|
||||
* zero!
|
||||
@ -204,7 +223,7 @@ int mbedtls_internal_ecp_normalize_jac_many( const mbedtls_ecp_group *grp,
|
||||
/**
|
||||
* \brief Normalize jacobian coordinates so that Z == 0 || Z == 1.
|
||||
*
|
||||
* Cost in field operations if done by GECC 3.2.1:
|
||||
* Cost in field operations if done by [5] 3.2.1:
|
||||
* 1N := 1I + 3M + 1S
|
||||
*
|
||||
* \param grp Pointer to the group representing the curve.
|
||||
@ -232,7 +251,6 @@ int mbedtls_internal_ecp_double_add_mxz( const mbedtls_ecp_group *grp,
|
||||
/**
|
||||
* \brief Randomize projective x/z coordinates:
|
||||
* (X, Z) -> (l X, l Z) for random l
|
||||
* This is sort of the reverse operation of ecp_normalize_mxz().
|
||||
*
|
||||
* \param grp pointer to the group representing the curve
|
||||
*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user