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secp256k1_fe_sqrt checks for success

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- secp256k1_fe_sqrt now checks that the value it calculated is actually a square root.
- Add return values to secp256k1_fe_sqrt and secp256k1_ge_set_xo.
- Callers of secp256k1_ge_set_xo can use return value instead of explicit validity checks
- Add random value tests for secp256k1_fe_sqrt
This commit is contained in:
Peter Dettman
2014-05-21 10:22:14 +07:00
parent 78fb796997
commit 09ca4f32e2
6 changed files with 84 additions and 21 deletions
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7
src/field.h
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@@ -82,9 +82,10 @@ void static secp256k1_fe_mul(secp256k1_fe_t *r, const secp256k1_fe_t *a, const s
* The output magnitude is 1 (but not guaranteed to be normalized). */
void static secp256k1_fe_sqr(secp256k1_fe_t *r, const secp256k1_fe_t *a);
/** Sets a field element to be the (modular) square root of another. Requires the inputs' magnitude to
* be at most 8. The output magnitude is 1 (but not guaranteed to be normalized). */
void static secp256k1_fe_sqrt(secp256k1_fe_t *r, const secp256k1_fe_t *a);
/** Sets a field element to be the (modular) square root (if any exist) of another. Requires the
* input's magnitude to be at most 8. The output magnitude is 1 (but not guaranteed to be
* normalized). Return value indicates whether a square root was found. */
int static secp256k1_fe_sqrt(secp256k1_fe_t *r, const secp256k1_fe_t *a);
/** Sets a field element to be the (modular) inverse of another. Requires the input's magnitude to be
* at most 8. The output magnitude is 1 (but not guaranteed to be normalized). */