### 12.5 Comparisons ¶

The next 2 functions are used to compare MPIs:

Function: `int` gcry_mpi_cmp `(const gcry_mpi_t u, const gcry_mpi_t v)` ¶

  Compare the multi-precision-integers number u and v, returning 0 for equality, a positive value for u > v and a negative for u < v. If both numbers are opaque values (cf. `gcry_mpi_set_opaque`), the comparison is done by checking the bit sizes using memcmp. If only one number is an opaque value, the opaque value is less than the other number.

Function: `int` gcry_mpi_cmp_ui `(const gcry_mpi_t u, unsigned long v)` ¶

  Compare the multi-precision-integers number u with the unsigned integer v, returning 0 for equality, a positive value for u > v and a negative for u < v.

Function: `int` gcry_mpi_is_neg `(const gcry_mpi_t a)` ¶

  Return 1 if a is less than zero; return 0 if zero or positive.