Add preliminarily DSA functionality
Merge branch 'master' into dsa-api
More compact conditionals
Merge branch 'master' into dsa-api
Change DSAParams to DSAParameters
Added basic DSA backend blueprint
Merge branch 'master' into dsa-api
Use bit_length function from utils
Add binding for DSA_new()
Added conditionals to backend. Removed incompatible values
Merge branch 'master' into dsa-api
Separate generation logic into separate PR
Remove generation methods to separate generation logic completely
Remove repeated validation conditionals
Change lists to tuples
Use the actual argument names in the exception messages
Move shared parameter checking to a module function
Merge branch 'master' into dsa-api
PEP8 fixes
Add validation for the values of x and y