[age restriction] progress 14/n - withdraw and deposit

Age restriction support for
  - withdraw is done and tested
  - deposit is done and tested

TODOs:
  - melt/refresh/reveal
  - link

------

Added functions
 - TALER_age_restriction_commit
 - TALER_age_commitment_derive
 - TALER_age_commitment_hash
 - TALER_age_restriction_commitment_free_inside
 - Hash of age commitment passed around API boundaries

Exchangedb adjustments for denominations
 - all prepared statements re: denominations now handle age_mask
 - signature parameters adjusted

Hash and signature verification of /keys adjusted
 - Hashes of (normal) denominations and age-restricted denominations are
   calculated seperately
 - The hash of the age-restricted ones will then be added to the other
   hash
 - The total hash is signed/verified

Tests for withdraw with age restriction added
 - TALER_EXCHANGE_DenomPublickey now carries age_mask
 - TALER_TESTING_cmd_withdraw_amount* takes age parameter
 - TALER_TESTING_find_pk takes boolean age_restricted
 - WithdrawState carries age_commitment and its hash
 - withdraw_run derives new age commitment, if applicable
 - Added age parameter to testing (13 as example)

Various Fixes and changes
 - Fixes of post handler for /management/extensions
 - Fixes for offline tool extensions signing
 - Slight refactoring of extensions
 - Age restriction extension simplified
   - config is now global to extension
   - added global TEH_age_restriction_enabled and TEH_age_mask in
     taler-exchange-httpd
   - helper functions and macros introduced

1 files changed, 4 insertions, 0 deletions

diff --git a/src/auditor/taler-helper-auditor-coins.c b/src/auditor/taler-helper-auditor-coins.c
index d425b9ead..2ed8e5a15 100644
--- a/src/auditor/taler-helper-auditor-coins.c
+++ b/src/auditor/taler-helper-auditor-coins.c
@@ -1224,6 +1224,7 @@ static int
 refresh_session_cb (void *cls,
                     uint64_t rowid,
                     const struct TALER_DenominationPublicKey *denom_pub,
+                    const struct TALER_AgeCommitmentHash *h_age_commitment,
                     const struct TALER_CoinSpendPublicKeyP *coin_pub,
                     const struct TALER_CoinSpendSignatureP *coin_sig,
                     const struct TALER_Amount *amount_with_fee,
@@ -1286,6 +1287,7 @@ refresh_session_cb (void *cls,
                                   &fee_refresh,
                                   rc,
                                   &h_denom_pub,
+                                  h_age_commitment,
                                   coin_pub,
                                   coin_sig))
     {
@@ -1612,6 +1614,7 @@ deposit_cb (void *cls,
     struct TALER_MerchantWireHash h_wire;
     struct TALER_DenominationHash h_denom_pub;
     struct TALER_Amount deposit_fee;
+    struct TALER_AgeCommitmentHash *h_age_commitment = NULL; /* FIXME-oec */
 
     TALER_denom_pub_hash (denom_pub,
                           &h_denom_pub);
@@ -1628,6 +1631,7 @@ deposit_cb (void *cls,
                                      &deposit_fee,
                                      &h_wire,
                                      &deposit->h_contract_terms,
+                                     h_age_commitment, /* FIXME-oec */
                                      NULL /* h_extensions! */,
                                      &h_denom_pub,
                                      deposit->timestamp,