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interop: add interop API for MODMUL, MODPOW opcodes

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This commit is contained in:
Anna Shaleva 2022-05-12 14:23:22 +03:00
parent e66e82278c
commit e31f4ca331
2 changed files with 51 additions and 0 deletions
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40
pkg/compiler/syscall_test.go
View file

@ -334,4 +334,44 @@ func TestOpcode(t *testing.T) {
stackitem.Make(false), stackitem.Make(false),
}) })
}) })
t.Run("MODMUL", func(t *testing.T) {
src := `package foo
import "github.com/nspcc-dev/neo-go/pkg/interop/math"
func Main() []int {
r := make([]int, 5)
r[0] = math.ModMul(3, 4, 5)
r[1] = math.ModMul(-3, 4, 5)
r[2] = math.ModMul(3, 4, -5)
r[3] = math.ModMul(-3, 4, -5)
r[4] = math.ModMul(0, 4, 5)
return r
}`
eval(t, src, []stackitem.Item{
stackitem.Make(2),
stackitem.Make(3),
stackitem.Make(2),
stackitem.Make(3),
stackitem.Make(0),
})
})
t.Run("MODPOW", func(t *testing.T) {
src := `package foo
import "github.com/nspcc-dev/neo-go/pkg/interop/math"
func Main() []int {
r := make([]int, 5)
r[0] = math.ModPow(3, 4, 5)
r[1] = math.ModPow(-3, 5, 5)
r[2] = math.ModPow(3, 4, -5)
r[3] = math.ModPow(-3, 5, -5)
r[4] = math.ModPow(19, -1, 141)
return r
}`
eval(t, src, []stackitem.Item{
stackitem.Make(1),
stackitem.Make(2),
stackitem.Make(1),
stackitem.Make(2),
stackitem.Make(52),
})
})
} }

11
pkg/interop/math/math.go
View file

@ -44,3 +44,14 @@ func Min(a, b int) int {
func Within(x, a, b int) bool { func Within(x, a, b int) bool {
return neogointernal.Opcode3("WITHIN", x, a, b).(bool) return neogointernal.Opcode3("WITHIN", x, a, b).(bool)
} }
// ModMul returns the result of modulus division on a*b.
func ModMul(a, b, mod int) int {
return neogointernal.Opcode3("MODMUL", a, b, mod).(int)
}
// ModPow returns the result of modulus division on a^b. If b is -1,
// it returns the modular inverse of a.
func ModPow(a, b, mod int) int {
return neogointernal.Opcode3("MODPOW", a, b, mod).(int)
}