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Added uECC_generate_random_int(), and made uECC_vli_cmp() constant-time.

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Ken MacKay
2015-10-12 21:29:56 -07:00
parent 41207c563a
commit 69744ae539
4 changed files with 69 additions and 38 deletions
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uECC_vli.h
+9 -5
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@@ -29,15 +29,16 @@ bitcount_t uECC_vli_numBits(const uECC_word_t *vli, const wordcount_t max_words)
/* Sets dest = src. */
void uECC_vli_set(uECC_word_t *dest, const uECC_word_t *src, wordcount_t num_words);
/* Returns sign of left - right. */
cmpresult_t uECC_vli_cmp(const uECC_word_t *left, const uECC_word_t *right, wordcount_t num_words);
/* Constant-time comparison function - secure way to compare long integers */
/* Returns one if left == right, zero otherwise */
uECC_word_t uECC_vli_equal(const uECC_word_t *left,
const uECC_word_t *right,
wordcount_t num_words);
/* Constant-time comparison function - secure way to compare long integers */
/* Returns sign of left - right, in constant time. */
cmpresult_t uECC_vli_cmp(const uECC_word_t *left, const uECC_word_t *right, wordcount_t num_words);
/* Computes vli = vli >> 1. */
void uECC_vli_rshift1(uECC_word_t *vli, wordcount_t num_words);
@@ -134,14 +135,17 @@ const uECC_word_t *uECC_curve_n(uECC_Curve curve);
const uECC_word_t *uECC_curve_G(uECC_Curve curve);
const uECC_word_t *uECC_curve_b(uECC_Curve curve);
/* Multiply a point by a scalar. Points are represented by the X coordinate followed by
/* Multiplies a point by a scalar. Points are represented by the X coordinate followed by
the Y coordinate in the same array, both coordinates are curve->num_words long. Note
that scalar must be curve->num_n_words long (NOT curve->num_words). */
void uECC_point_mult(uECC_word_t *result,
const uECC_word_t *point,
const uECC_word_t *scalar,
uECC_Curve curve);
/* Generates a random integer r in the range 0 < r < curve->n */
int uECC_generate_random_int(uECC_word_t *random, uECC_Curve curve);
#ifdef __cplusplus
} /* end of extern "C" */
#endif