(gcrypt.info.gz) Bit manipulations

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 11.6 Bit manipulations
 ======================
 
 There are a couple of functions to get information on arbitrary bits in
 an MPI and to set or clear them:
 
  -- Function: unsigned int gcry_mpi_get_nbits (gcry_mpi_t A)
      Return the number of bits required to represent A.
 
  -- Function: int gcry_mpi_test_bit (gcry_mpi_t A, unsigned int N)
      Return true if bit number N (counting from 0) is set in A.
 
  -- Function: void gcry_mpi_set_bit (gcry_mpi_t A, unsigned int N)
      Set bit number N in A.
 
  -- Function: void gcry_mpi_clear_bit (gcry_mpi_t A, unsigned int N)
      Clear bit number N in A.
 
  -- Function: void gcry_mpi_set_highbit (gcry_mpi_t A, unsigned int N)
      Set bit number N in A and clear all bits greater than N.
 
  -- Function: void gcry_mpi_clear_highbit (gcry_mpi_t A, unsigned int N)
      Clear bit number N in A and all bits greater than N.
 
  -- Function: void gcry_mpi_rshift (gcry_mpi_t X, gcry_mpi_t A,
           unsigned int N)
      Shift the value of A by N bits to the right and store the result
      in X.
 

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