PBC Library Manual 0.5.11 - Stanford Crypto Group

int element_length_in_bytes_x_only(element_t e)
Chapter 4. Element functions
Assumes e is a point on an elliptic curve. Returns the length in bytes needed to hold the x-coordinate of e.
int element_to_bytes_compressed(unsigned char *data, element_t e)
If possible, outputs a compressed form of the element e to the buffer of bytes data. Currently only implemented
for points on an elliptic curve.
int element_from_bytes_compressed(element_t e, unsigned char *data)
Sets element e to the element in compressed form in the buffer of bytes data. Currently only implemented for
points on an elliptic curve.
int element_length_in_bytes_compressed(element_t e)
Returns the number of bytes needed to hold e in compressed form. Currently only implemented for points on
an elliptic curve.
int element_item_count(element_t e)
For points, returns the number of coordinates. For polynomials, returns the number of coefficients. Otherwise
returns zero.
element_t element_item(element_t e, int i)
For points, returns nth coordinate. For polynomials, returns coefficient of x n . Otherwise returns NULL. The
element the return value points to may be modified.
element_t element_x(element_t a)
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