ECNTT
ECNTT Method​
The ECNtt[T any]()
function performs the Elliptic Curve Number Theoretic Transform (EC-NTT) on the input points slice, using the provided dir (direction), cfg (configuration), and stores the results in the results slice.
func ECNtt[T any](points core.HostOrDeviceSlice, dir core.NTTDir, cfg *core.NTTConfig[T], results core.HostOrDeviceSlice) runtime.EIcicleError
Parameters​
points
: A slice of elliptic curve points (in projective coordinates) that will be transformed. The slice can be stored on the host or the device, as indicated by thecore.HostOrDeviceSlice
type.dir
: The direction of the EC-NTT transform, eithercore.KForward
orcore.KInverse
.cfg
: A pointer to anNTTConfig
object, containing configuration options for the NTT operation.results
: A slice that will store the transformed elliptic curve points (in projective coordinates). The slice can be stored on the host or the device, as indicated by thecore.HostOrDeviceSlice
type.
Return Value​
EIcicleError
: Aruntime.EIcicleError
value, which will beruntime.Success
if the EC-NTT operation was successful, or an error if something went wrong.
NTT Configuration (NTTConfig)​
The NTTConfig
structure holds configuration parameters for the NTT operation, allowing customization of its behavior to optimize performance based on the specifics of your protocol.
type NTTConfig[T any] struct {
StreamHandle runtime.Stream
CosetGen T
BatchSize int32
ColumnsBatch bool
Ordering Ordering
areInputsOnDevice bool
areOutputsOnDevice bool
IsAsync bool
Ext config_extension.ConfigExtensionHandler
}
Fields​
StreamHandle
: Specifies the stream (queue) to use for async execution.CosetGen
: Coset generator. Used to perform coset (i)NTTs.BatchSize
: The number of NTTs to compute in one operation, defaulting to 1.ColumnsBatch
: If true the function will compute the NTTs over the columns of the input matrix and not over the rows.Ordering
: Ordering of inputs and outputs (KNN
,KNR
,KRN
,KRR
), affecting how data is arranged.areInputsOnDevice
: Indicates if input scalars are located on the device.areOutputsOnDevice
: Indicates if results are stored on the device.IsAsync
: Controls whether the NTT operation runs asynchronously.Ext
: Extended configuration for backend.
Default Configuration​
Use GetDefaultNTTConfig
to obtain a default configuration, customizable as needed.
func GetDefaultNTTConfig[T any](cosetGen T) NTTConfig[T]
ECNTT Example​
package main
import (
"github.com/ingonyama-zk/icicle/v3/wrappers/golang/core"
"github.com/ingonyama-zk/icicle/v3/wrappers/golang/curves/bn254"
"github.com/ingonyama-zk/icicle/v3/wrappers/golang/curves/bn254/ecntt"
"github.com/ingonyama-zk/icicle/v3/wrappers/golang/curves/bn254/ntt"
"github.com/ingonyama-zk/icicle/v3/wrappers/golang/runtime"
)
func Main() {
// Load backend using env path
runtime.LoadBackendFromEnvOrDefault()
// Set Cuda device to perform
device := runtime.CreateDevice("CUDA", 0)
runtime.SetDevice(&device)
// Obtain the default NTT configuration with a predefined coset generator.
cfg := ntt.GetDefaultNttConfig()
// Define the size of the input scalars.
size := 1 << 18
// Generate Points for the ECNTT operation.
points := bn254.GenerateProjectivePoints(size)
// Set the direction of the NTT (forward or inverse).
dir := core.KForward
// Allocate memory for the results of the NTT operation.
results := make(core.HostSlice[bn254.Projective], size)
// Perform the NTT operation.
err := ecntt.ECNtt(points, dir, &cfg, results)
if err != runtime.Success {
panic("ECNTT operation failed")
}
}