[taler-anastasis] 01/03: worked on eddsa priv/pub key derivation

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dennis-neufeld pushed a commit to branch master
in repository anastasis.

commit fc8f7362a2d7c75a8851b7bde6322cf83860e7ca
Author: Dennis Neufeld <address@hidden>
AuthorDate: Mon Mar 30 06:11:14 2020 +0000

    worked on eddsa priv/pub key derivation
---
 src/include/anastasis_crypto_lib.h |  4 ++--
 src/util/anastasis_crypto.c        | 37 +++++++++++++++++++++++++++++++++----
 2 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/src/include/anastasis_crypto_lib.h 
b/src/include/anastasis_crypto_lib.h
index 18bde96..9baf96f 100644
--- a/src/include/anastasis_crypto_lib.h
+++ b/src/include/anastasis_crypto_lib.h
@@ -133,8 +133,8 @@ ANASTASIS_CRYPTO_user_identifier_derive (
  */
 void
 ANASTASIS_CRYPTO_account_public_key_derive (
-  struct ANASTASIS_CRYPTO_AccountPublicKey *pub_key,
-  const struct ANASTASIS_CRYPTO_UserIdentifier *id);
+  const struct ANASTASIS_CRYPTO_UserIdentifier *id,
+  struct ANASTASIS_CRYPTO_AccountPublicKey *pub_key);
 
 /**
  * Encrypt and signs the recovery document with AES256, the recovery document 
is
diff --git a/src/util/anastasis_crypto.c b/src/util/anastasis_crypto.c
index 59a3861..7ea4a7d 100644
--- a/src/util/anastasis_crypto.c
+++ b/src/util/anastasis_crypto.c
@@ -226,6 +226,31 @@ ANASTASIS_CRYPTO_user_identifier_derive (
 }
 
 
+/**
+ * Generates the eddsa private key used to authorize operations on policy
+ * @param id holds a hashed user secret which is used as entropy source for 
the public key generation
+ * @param priv_key handle for the generated private key
+ */
+static void
+ANASTASIS_CRYPTO_account_private_key_derive (
+  const struct ANASTASIS_CRYPTO_UserIdentifier *id,
+  struct GNUNET_CRYPTO_EddsaPrivateKey *priv_key)
+{
+  void *ver_secret;
+  GNUNET_CRYPTO_hkdf (&ver_secret,
+                      sizeof (ver_secret),
+                      GCRY_MD_SHA512,
+                      GCRY_MD_SHA256,
+                      id,
+                      sizeof (struct ANASTASIS_CRYPTO_UserIdentifier),
+                      "ver",
+                      strlen ("ver"),
+                      NULL,
+                      0);
+  // *priv_key = eddsa_d_to_a (id);
+}
+
+
 /**
  * Generates the eddsa public Key used as the account identifier on the 
providers
  * @param id holds a hashed user secret which is used as entropy source for 
the public key generation
@@ -233,10 +258,12 @@ ANASTASIS_CRYPTO_user_identifier_derive (
  */
 void
 ANASTASIS_CRYPTO_account_public_key_derive (
-  struct ANASTASIS_CRYPTO_AccountPublicKey *pub_key,
-  const struct ANASTASIS_CRYPTO_UserIdentifier *id)
+  const struct ANASTASIS_CRYPTO_UserIdentifier *id,
+  struct ANASTASIS_CRYPTO_AccountPublicKey *pub_key)
 {
-
+  struct GNUNET_CRYPTO_EddsaPrivateKey *priv;
+  ANASTASIS_CRYPTO_account_private_key_derive (id, priv);
+  GNUNET_CRYPTO_eddsa_key_get_public (priv, &pub_key->pub);
 }
 
 
@@ -415,7 +442,9 @@ void
 ANASTASIS_CRYPTO_key_share_create (
   struct ANASTASIS_CRYPTO_KeyShare *key_share)
 {
-
+  GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_STRONG,
+                              key_share,
+                              sizeof (struct ANASTASIS_CRYPTO_KeyShare));
 }
 
 

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