diff --git a/src/exchange/taler-exchange-httpd_keys.c b/src/exchange/taler-exchange-httpd_keys.c
index 3fa1007ce..81ebf291b 100644
--- a/src/exchange/taler-exchange-httpd_keys.c
+++ b/src/exchange/taler-exchange-httpd_keys.c
@@ -2415,7 +2415,7 @@ TEH_keys_denomination_by_hash2 (
 
 struct TALER_BlindedDenominationSignature
 TEH_keys_denomination_sign (const struct TALER_DenominationHash *h_denom_pub,
-                            const struct TEH_SignDetails *msg,
+                            const struct TALER_BlindedPlanchet *bp,
                             enum TALER_ErrorCode *ec)
 {
   struct TEH_KeyStateHandle *ksh;
@@ -2438,7 +2438,7 @@ TEH_keys_denomination_sign (const struct TALER_DenominationHash *h_denom_pub,
     *ec = TALER_EC_EXCHANGE_GENERIC_DENOMINATION_KEY_UNKNOWN;
     return none;
   }
-  if (msg->cipher != hd->denom_pub.cipher)
+  if (bp->cipher != hd->denom_pub.cipher)
   {
     *ec = TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
     return none;
@@ -2448,13 +2448,15 @@ TEH_keys_denomination_sign (const struct TALER_DenominationHash *h_denom_pub,
   case TALER_DENOMINATION_RSA:
     return TALER_CRYPTO_helper_rsa_sign (ksh->helpers->rsadh,
                                          &hd->h_details.h_rsa,
-                                         msg->details.rsa_message.msg,
-                                         msg->details.rsa_message.msg_size,
+                                         bp->details.rsa_blinded_planchet.
+                                         blinded_msg,
+                                         bp->details.rsa_blinded_planchet.
+                                         blinded_msg_size,
                                          ec);
   case TALER_DENOMINATION_CS:
     return TALER_CRYPTO_helper_cs_sign (ksh->helpers->csdh,
                                         &hd->h_details.h_cs,
-                                        &msg->details.cs_message,
+                                        &bp->details.cs_blinded_planchet,
                                         ec);
   default:
     *ec = TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
diff --git a/src/exchange/taler-exchange-httpd_keys.h b/src/exchange/taler-exchange-httpd_keys.h
index 0cab75070..6dbd0d195 100644
--- a/src/exchange/taler-exchange-httpd_keys.h
+++ b/src/exchange/taler-exchange-httpd_keys.h
@@ -82,42 +82,6 @@ struct TEH_DenominationKey
 };
 
 
-struct TEH_SignDetails_RSA
-{
-  /**
-   * message to sign
-   */
-  const void *msg;
-
-  /**
-   * number of bytes in msg
-   */
-  size_t msg_size;
-};
-
-
-struct TEH_SignDetails
-{
-  /**
-   * Cipher type of the message
-   */
-  enum TALER_DenominationCipher cipher;
-
-  union
-  {
-    /**
-     * If we use #TALER_DENOMINATION_RSA in @a cipher.
-     */
-    struct TEH_SignDetails_RSA rsa_message;
-
-    /**
-     * If we use #TALER_DENOMINATION_CS in @a cipher.
-     */
-    struct TALER_BlindedCsPlanchet cs_message;
-  } details;
-};
-
-
 /**
  * Snapshot of the (coin and signing) keys (including private keys) of
  * the exchange.  There can be multiple instances of this struct, as it is
@@ -207,15 +171,14 @@ TEH_keys_denomination_by_hash2 (struct TEH_KeyStateHandle *ksh,
  * @a h_denom_pub.
  *
  * @param h_denom_pub hash of the public key to use to sign
- * @param msg message to sign
- * @param msg_size number of bytes in @a msg
+ * @param bp blinded planchet to sign
  * @param[out] ec set to the error code (or #TALER_EC_NONE on success)
  * @return signature, the value inside the structure will be NULL on failure,
  *         see @a ec for details about the failure
  */
 struct TALER_BlindedDenominationSignature
 TEH_keys_denomination_sign (const struct TALER_DenominationHash *h_denom_pub,
-                            const struct TEH_SignDetails *msg,
+                            const struct TALER_BlindedPlanchet *bp,
                             enum TALER_ErrorCode *ec);
 
 
diff --git a/src/exchange/taler-exchange-httpd_refreshes_reveal.c b/src/exchange/taler-exchange-httpd_refreshes_reveal.c
index 646728ecd..568278144 100644
--- a/src/exchange/taler-exchange-httpd_refreshes_reveal.c
+++ b/src/exchange/taler-exchange-httpd_refreshes_reveal.c
@@ -603,18 +603,11 @@ resolve_refreshes_reveal_denominations (struct MHD_Connection *connection,
   for (unsigned int i = 0; i<rctx->num_fresh_coins; i++)
   {
     enum TALER_ErrorCode ec = TALER_EC_NONE;
-    struct TEH_SignDetails sign_details;
-    const struct TALER_BlindedRsaPlanchet *rp;
 
-    // FIXME: implement cipher handling
-    rp = &rcds[i].blinded_planchet.details.rsa_blinded_planchet;
-    sign_details.cipher = TALER_DENOMINATION_RSA;
-    sign_details.details.rsa_message.msg = rp->blinded_msg;
-    sign_details.details.rsa_message.msg_size = rp->blinded_msg_size;
     rrcs[i].coin_sig
       = TEH_keys_denomination_sign (
           &rrcs[i].h_denom_pub,
-          &sign_details,
+          &rcds[i].blinded_planchet,
           &ec);
     if (TALER_EC_NONE != ec)
     {
diff --git a/src/exchange/taler-exchange-httpd_withdraw.c b/src/exchange/taler-exchange-httpd_withdraw.c
index 5cae883e2..adac25659 100644
--- a/src/exchange/taler-exchange-httpd_withdraw.c
+++ b/src/exchange/taler-exchange-httpd_withdraw.c
@@ -502,34 +502,10 @@ TEH_handler_withdraw (struct TEH_RequestContext *rc,
 
   /* Sign before transaction! */
   ec = TALER_EC_NONE;
-  {
-    struct TEH_SignDetails sign_details;
-    sign_details.cipher = wc.blinded_planchet.cipher;
-    switch (wc.blinded_planchet.cipher)
-    {
-    case TALER_DENOMINATION_RSA:
-      sign_details.details.rsa_message.msg =
-        wc.blinded_planchet.details.rsa_blinded_planchet.blinded_msg;
-      sign_details.details.rsa_message.msg_size =
-        wc.blinded_planchet.details.rsa_blinded_planchet.blinded_msg_size;
-      break;
-    case TALER_DENOMINATION_CS:
-      sign_details.details.cs_message =
-        wc.blinded_planchet.details.cs_blinded_planchet;
-      break;
-    default:
-      GNUNET_break (0);
-      GNUNET_JSON_parse_free (spec);
-      return TALER_MHD_reply_with_error (rc->connection,
-                                         MHD_HTTP_FORBIDDEN,
-                                         TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE,
-                                         NULL);
-    }
-    wc.collectable.sig = TEH_keys_denomination_sign (
-      &wc.collectable.denom_pub_hash,
-      &sign_details,
-      &ec);
-  }
+  wc.collectable.sig = TEH_keys_denomination_sign (
+    &wc.collectable.denom_pub_hash,
+    &wc.blinded_planchet,
+    &ec);
   if (TALER_EC_NONE != ec)
   {
     GNUNET_break (0);