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Use constant-time conditional moves instead of byte slicing

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Pieter Wuille
2014-12-02 20:20:13 +01:00
parent d220062ac2
commit efb7d4b299
7 changed files with 55 additions and 10 deletions
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4
src/field.h
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@@ -110,11 +110,13 @@ static void secp256k1_fe_inv_all(size_t len, secp256k1_fe_t r[len], const secp25
/** Potentially faster version of secp256k1_fe_inv_all, without constant-time guarantee. */
static void secp256k1_fe_inv_all_var(size_t len, secp256k1_fe_t r[len], const secp256k1_fe_t a[len]);
/** Convert a field element to a hexadecimal string. */
static void secp256k1_fe_get_hex(char *r, int *rlen, const secp256k1_fe_t *a);
/** Convert a hexadecimal string to a field element. */
static int secp256k1_fe_set_hex(secp256k1_fe_t *r, const char *a, int alen);
/** If flag is true, set *r equal to *a; otherwise leave it. Constant-time. */
static void secp256k1_fe_cmov(secp256k1_fe_t *r, const secp256k1_fe_t *a, int flag);
#endif