/*
* B1: verify whether r' in [1,n-1], verification failed if not
- * B2: vefify whether s' in [1,n-1], verification failed if not
+ * B2: verify whether s' in [1,n-1], verification failed if not
* B3: set M'~=ZA || M'
* B4: calculate e'=Hv(M'~)
* B5: calculate t = (r' + s') modn, verification failed if t=0
* B6: calculate the point (x1', y1')=[s']G + [t]PA
- * B7: calculate R=(e'+x1') modn, verfication pass if yes, otherwise failed
+ * B7: calculate R=(e'+x1') modn, verification pass if yes, otherwise failed
*/
ECDSA_SIG_get0(sig, &r, &s);