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Remove less-safe mult function from public API

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This doesn't change code size, but makes it easier to remove unneeded
parameters later (less possible entry points).
This commit is contained in:
Manuel Pégourié-Gonnard 2019-11-04 11:26:46 +01:00
parent ef238283d5
commit 27926d63b7
2 changed files with 2 additions and 29 deletions
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27
include/tinycrypt/ecc.h
View file

@ -282,33 +282,6 @@ int uECC_compute_public_key(const uint8_t *private_key,
uECC_word_t EccPoint_compute_public_key(uECC_word_t *result, uECC_word_t EccPoint_compute_public_key(uECC_word_t *result,
uECC_word_t *private_key, uECC_Curve curve); uECC_word_t *private_key, uECC_Curve curve);
/*
* @brief Regularize the bitcount for the private key so that attackers cannot
* use a side channel attack to learn the number of leading zeros.
* @return Regularized k
* @param k IN -- private-key
* @param k0 IN/OUT -- regularized k
* @param k1 IN/OUT -- regularized k
* @param curve IN -- elliptic curve
*/
uECC_word_t regularize_k(const uECC_word_t * const k, uECC_word_t *k0,
uECC_word_t *k1, uECC_Curve curve);
/*
* @brief Point multiplication algorithm using Montgomery's ladder with co-Z
* coordinates. See http://eprint.iacr.org/2011/338.pdf.
* @note Result may overlap point.
* @param result OUT -- returns scalar*point
* @param point IN -- elliptic curve point
* @param scalar IN -- scalar
* @param initial_Z IN -- initial value for z
* @param num_bits IN -- number of bits in scalar
* @param curve IN -- elliptic curve
*/
void EccPoint_mult(uECC_word_t * result, const uECC_word_t * point,
const uECC_word_t * scalar, const uECC_word_t * initial_Z,
bitcount_t num_bits, uECC_Curve curve);
/* /*
* @brief Point multiplication algorithm using Montgomery's ladder with co-Z * @brief Point multiplication algorithm using Montgomery's ladder with co-Z
* coordinates. See http://eprint.iacr.org/2011/338.pdf. * coordinates. See http://eprint.iacr.org/2011/338.pdf.

4
tinycrypt/ecc.c
View file

@ -871,7 +871,7 @@ static void XYcZ_addC_rnd(uECC_word_t * X1, uECC_word_t * Y1,
uECC_vli_set(X1, t7, num_words); uECC_vli_set(X1, t7, num_words);
} }
void EccPoint_mult(uECC_word_t * result, const uECC_word_t * point, static void EccPoint_mult(uECC_word_t * result, const uECC_word_t * point,
const uECC_word_t * scalar, const uECC_word_t * scalar,
const uECC_word_t * initial_Z, const uECC_word_t * initial_Z,
bitcount_t num_bits, uECC_Curve curve) bitcount_t num_bits, uECC_Curve curve)
@ -920,7 +920,7 @@ void EccPoint_mult(uECC_word_t * result, const uECC_word_t * point,
uECC_vli_set(result + num_words, Ry[0], num_words); uECC_vli_set(result + num_words, Ry[0], num_words);
} }
uECC_word_t regularize_k(const uECC_word_t * const k, uECC_word_t *k0, static uECC_word_t regularize_k(const uECC_word_t * const k, uECC_word_t *k0,
uECC_word_t *k1, uECC_Curve curve) uECC_word_t *k1, uECC_Curve curve)
{ {