From 4241694252c5d05391ca441ecffdbb1c4054b1fe Mon Sep 17 00:00:00 2001
From: "F. Duncanh" <fduncanh@gmail.com>
Date: Thu, 23 Nov 2023 21:30:46 -0500
Subject: [PATCH] facility fopr getting ED25519 private key for srp

---
 lib/crypto.c  | 6 +++++-
 lib/crypto.h  | 1 +
 lib/pairing.c | 5 +++++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/crypto.c b/lib/crypto.c
index 09344ad..b63d582 100644
--- a/lib/crypto.c
+++ b/lib/crypto.c
@@ -350,8 +350,12 @@ struct ed25519_key_s {
     unsigned char ed_secret[ED25519_KEY_SIZE];
 };
 
-int extract_evp_private_key(unsigned char *privkey, int keylen, EVP_PKEY *key) {
+const unsigned char* ed25519_secret_key(const ed25519_key_t *key) {
+    assert(key);
+    return (const unsigned char *) key->ed_secret;
+}
 
+int extract_evp_private_key(unsigned char *privkey, int keylen, EVP_PKEY *key) {
     int count = 0;
     unsigned int val;
     unsigned int part1 = 0;
diff --git a/lib/crypto.h b/lib/crypto.h
index d00b3dd..c0cf221 100644
--- a/lib/crypto.h
+++ b/lib/crypto.h
@@ -82,6 +82,7 @@ int gcm_decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *pl
 
 typedef struct ed25519_key_s ed25519_key_t;
 
+const unsigned char* ed25519_secret_key(const ed25519_key_t *key);
 ed25519_key_t *ed25519_key_generate(void);
 ed25519_key_t *ed25519_key_from_raw(const unsigned char data[ED25519_KEY_SIZE]);
 void ed25519_key_get_raw(unsigned char data[ED25519_KEY_SIZE], const ed25519_key_t *key);
diff --git a/lib/pairing.c b/lib/pairing.c
index 848a7bc..1448f0f 100644
--- a/lib/pairing.c
+++ b/lib/pairing.c
@@ -90,6 +90,11 @@ pairing_get_public_key(pairing_t *pairing, unsigned char public_key[ED25519_KEY_
     ed25519_key_get_raw(public_key, pairing->ed);
 }
 
+const unsigned char *srp_private_key(pairing_t *pairing) {
+    assert(pairing);
+    return ed25519_secret_key(pairing->ed);  
+}
+
 int
 pairing_get_ecdh_secret_key(pairing_session_t *session, unsigned char ecdh_secret[X25519_KEY_SIZE])
 {