mirror of
https://github.com/andwati/telecom-platform.git
synced 2026-10-18 11:02:54 +00:00
nutcas3
a335c6754e
- Move IMSI allocation logic to subscriber_imsi.go - Move authentication key generation (generateAuthKeys, getOperatorVariant, generateOPc) to subscriber_auth.go - Move eSIM profile operations (provisionESIMProfile, deactivateESIMProfile) to subscriber_esim.go - Keep core subscriber CRUD operations and session management in subscriber.go - Remove unused crypto/aes, crypto/rand, encoding/hex, and os imports from main
82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
package services
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/rand"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"os"
|
|
)
|
|
|
|
// generateAuthKeys generates authentication keys for the subscriber
|
|
func (s *SubscriberService) generateAuthKeys() (string, string, error) {
|
|
// Generate 128-bit random key (K)
|
|
key := make([]byte, 16)
|
|
if _, err := rand.Read(key); err != nil {
|
|
return "", "", err
|
|
}
|
|
|
|
// Get OP (Operator variant) from operator configuration
|
|
// This should be consistent across all subscribers for the same operator
|
|
op := s.getOperatorVariant()
|
|
if op == nil {
|
|
return "", "", fmt.Errorf("operator variant not configured")
|
|
}
|
|
|
|
// Generate OPc (derived from OP and K) using AES-128 encryption
|
|
// OPc = AES-128(K, OP) where OP is encrypted with K
|
|
opc, err := s.generateOPc(key, op)
|
|
if err != nil {
|
|
return "", "", err
|
|
}
|
|
|
|
return hex.EncodeToString(key), hex.EncodeToString(opc), nil
|
|
}
|
|
|
|
// getOperatorVariant returns the operator variant (OP) from configuration
|
|
func (s *SubscriberService) getOperatorVariant() []byte {
|
|
// Get operator variant from environment variable or secure configuration
|
|
// This should be the same across all subscribers for the same operator
|
|
opStr := os.Getenv("OPERATOR_VARIANT")
|
|
if opStr == "" {
|
|
// Fallback to default for development
|
|
opStr = "TelecomOP1234567" // 16-byte operator variant
|
|
}
|
|
|
|
// Ensure exactly 16 bytes for AES-128
|
|
op := make([]byte, 16)
|
|
copy(op, []byte(opStr))
|
|
|
|
// If shorter than 16 bytes, pad with zeros
|
|
if len(opStr) < 16 {
|
|
for i := len(opStr); i < 16; i++ {
|
|
op[i] = 0
|
|
}
|
|
}
|
|
|
|
return op
|
|
}
|
|
|
|
// generateOPc derives OPc from OP and K using AES-128 encryption
|
|
func (s *SubscriberService) generateOPc(k, op []byte) ([]byte, error) {
|
|
// Create AES-128 cipher block with key K
|
|
block, err := aes.NewCipher(k)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to create AES cipher: %w", err)
|
|
}
|
|
|
|
// OPc = AES-128(K, OP) - encrypt OP with key K
|
|
opc := make([]byte, aes.BlockSize) // AES block size is 16 bytes
|
|
|
|
// Create ECB mode cipher (as per 3GPP specification for OPc derivation)
|
|
// In 3GPP, OPc is derived using AES-128 ECB mode
|
|
if len(op) != aes.BlockSize {
|
|
return nil, fmt.Errorf("OP must be 16 bytes for AES-128")
|
|
}
|
|
|
|
// Encrypt OP using ECB mode (single block)
|
|
block.Encrypt(opc, op)
|
|
|
|
return opc, nil
|
|
}
|