int sc_is_zero(const void *value);
int sc_is_negative(const void *value);
int sc_had_carry(void);
+
+/**
+ * Return the bits of a tarval at a given byte-offset.
+ *
+ * @param value the value
+ * @param len number of valid bits in the value
+ * @param byte_ofs the byte offset
+ */
unsigned char sc_sub_bits(const void *value, int len, unsigned byte_ofs);
/**