use goroutines to accelerate encryption

[JohnJimAir]

`func Encrypt_Parallel(params hefloat.Parameters, encoder *hefloat.Encoder, encryptor *rlwe.Encryptor, values []float64, ) (values_ct []*rlwe.Ciphertext) {

length := len(values)
values_ct = make([]*rlwe.Ciphertext, length)

var wg sync.WaitGroup
for i:=0;i<length;i++ {
	wg.Add(1)
	go func(i int) {
		defer wg.Done()
		longvalues := make([]float64, params.MaxSlots())
		for j:=0;j<len(longvalues);j++ {
			longvalues[j] = values[i]
		}
		value_pt := hefloat.NewPlaintext(params, params.MaxLevel())
		if err := encoder.Encode(longvalues, value_pt); err != nil {
			panic(err)
		}
		value_ct, err := encryptor.EncryptNew(value_pt)
		if err != nil {
			panic(err)
		}
		values_ct[i] = value_ct
	}(i)
}
wg.Wait()
return

}`
this func is meant to use goroutines to get multiple ciphertexts in parallel, but the result is odd. The ciphertextxs returned are some vary large numbers, where is wrong？

[ChristianMct]

The Lattigo API is not concurrency-safe. Consequently, you cannot use the same 'Encryptor' struct in multiple goroutines.

Instead, you need to have a separate encryptor per goroutine. Note that you can obtain new encryptors efficiently by using the 'Encryptor.ShallowCopy()' method.

Hope this helps

[JohnJimAir]

thank you vary much