Creat Service BPJS

internal/services/bpjs/response.go

@@ -0,0 +1,59 @@
+package services
+
+import (
+	helper "api-service/internal/helpers/bpjs"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/sha256"
+	"encoding/base64"
+	"errors"
+	"fmt"
+)
+
+// ResponseVclaim decrypts the encrypted response from VClaim API
+func ResponseVclaim(encrypted string, key string) (string, error) {
+	if encrypted == "" {
+		return "", errors.New("encrypted response is empty")
+	}
+	
+	if key == "" {
+		return "", errors.New("decryption key is empty")
+	}
+
+	cipherText, err := base64.StdEncoding.DecodeString(encrypted)
+	if err != nil {
+		return "", fmt.Errorf("failed to decode base64: %w", err)
+	}
+
+	hash := sha256.Sum256([]byte(key))
+	block, err := aes.NewCipher(hash[:])
+	if err != nil {
+		return "", fmt.Errorf("failed to create cipher: %w", err)
+	}
+
+	if len(cipherText) < aes.BlockSize {
+		return "", errors.New("cipherText too short")
+	}
+
+	iv := hash[:aes.BlockSize]
+	if len(cipherText)%aes.BlockSize != 0 {
+		return "", errors.New("cipherText is not a multiple of the block size")
+	}
+
+	mode := cipher.NewCBCDecrypter(block, iv)
+	mode.CryptBlocks(cipherText, cipherText)
+	
+	// Unpad the decrypted data
+	cipherText, err = helper.Unpad(cipherText, aes.BlockSize)
+	if err != nil {
+		return "", fmt.Errorf("failed to unpad: %w", err)
+	}
+
+	// Decompress the data
+	data, err := helper.DecompressFromEncodedUriComponent(string(cipherText))
+	if err != nil {
+		return "", fmt.Errorf("failed to decompress: %w", err)
+	}
+
+	return data, nil
+}