[taler-exchange] 19/37: set planchet detail cipher, add cipher checks

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gian-demarmels pushed a commit to branch master
in repository exchange.

commit 36f551ff33ac0974788aff28d4b19390ca484f4b
Author: Lucien Heuzeveldt <lucienclaude.heuzeveldt@students.bfh.ch>
AuthorDate: Tue Jan 4 17:46:36 2022 +0100

    set planchet detail cipher, add cipher checks
---
 src/include/taler_crypto_lib.h | 3 ++-
 src/util/crypto.c              | 7 +++++++
 src/util/denom.c               | 8 ++++++++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index a20e5120..295d0e7b 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -1444,7 +1444,8 @@ TALER_planchet_setup_random (struct 
TALER_PlanchetSecretsP *ps,
  * @param ps secret planchet internals (for #TALER_planchet_to_coin)
  * @param[out] c_hash set to the hash of the public key of the coin (needed 
later)
  * @param[out] pd set to the planchet detail for TALER_MERCHANT_tip_pickup() 
and
- *               other withdraw operations
+ *               other withdraw operations, pd->blinded_planchet.cipher will 
be set
+ *               to cipher from dk
  * @return #GNUNET_OK on success
  */
 enum GNUNET_GenericReturnValue
diff --git a/src/util/crypto.c b/src/util/crypto.c
index 84d20d6b..445b820a 100644
--- a/src/util/crypto.c
+++ b/src/util/crypto.c
@@ -319,6 +319,7 @@ TALER_planchet_prepare (const struct 
TALER_DenominationPublicKey *dk,
     return GNUNET_SYSERR;
   }
 
+  pd->blinded_planchet.cipher = dk->cipher;
   TALER_denom_pub_hash (dk,
                         &pd->denom_pub_hash);
   return GNUNET_OK;
@@ -335,6 +336,12 @@ TALER_planchet_to_coin (const struct 
TALER_DenominationPublicKey *dk,
 {
   struct TALER_DenominationSignature sig;
 
+  if (dk->cipher != blind_sig->cipher)
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+
   switch (dk->cipher)
   {
   case TALER_DENOMINATION_RSA:
diff --git a/src/util/denom.c b/src/util/denom.c
index 90830260..a4965c05 100644
--- a/src/util/denom.c
+++ b/src/util/denom.c
@@ -112,6 +112,13 @@ TALER_denom_sign_blinded (struct 
TALER_BlindedDenominationSignature *denom_sig,
   memset (denom_sig,
           0,
           sizeof (*denom_sig));
+
+  if (blinded_planchet->cipher != denom_priv->cipher)
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+
   switch (denom_priv->cipher)
   {
   case TALER_DENOMINATION_INVALID:
@@ -394,6 +401,7 @@ TALER_denom_pub_verify (const struct 
TALER_DenominationPublicKey *denom_pub,
     GNUNET_break (0);
     return GNUNET_SYSERR;
   }
+
   switch (denom_pub->cipher)
   {
   case TALER_DENOMINATION_INVALID:

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