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complete implementation of TALER_MINT_refresh_prepare

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This commit is contained in:
Christian Grothoff 2015-08-08 16:09:25 +02:00
parent 669e3fcdf2
commit 495fab44f1
1 changed files with 82 additions and 27 deletions
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109
src/mint-lib/mint_api_refresh.c
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@ -97,12 +97,6 @@ struct FreshCoinP
*/
struct TALER_CoinSpendPrivateKeyP coin_priv;
/**
* Link secret used to encrypt the @a coin_priv and the blinding
* key in the linkage data.
*/
struct TALER_LinkSecretP link_secret;
/**
* Size of the encoded blinding key that follows.
*/
@ -128,9 +122,10 @@ struct MeltDataP
struct GNUNET_HashCode melt_session_hash;
/**
* Transfer secrets for each cut-and-choose dimension.
* Link secret used to encrypt the @a coin_priv and the blinding
* key in the linkage data for the respective cut-and-choose dimension.
*/
struct TALER_TransferSecretP transfer_secrets[TALER_CNC_KAPPA];
struct TALER_LinkSecretP link_secrets[TALER_CNC_KAPPA];
/**
* Number of coins we are melting, in NBO
@ -209,12 +204,6 @@ struct FreshCoin
*/
struct TALER_CoinSpendPrivateKeyP coin_priv;
/**
* Link secret used to encrypt the @a coin_priv and the blinding
* key in the linkage data.
*/
struct TALER_LinkSecretP link_secret;
/**
* Blinding key used for blinding during blind signing.
*/
@ -235,9 +224,9 @@ struct MeltData
struct GNUNET_HashCode melt_session_hash;
/**
* Transfer secrets for each cut-and-choose dimension.
* Link secrets for each cut-and-choose dimension.
*/
struct TALER_TransferSecretP transfer_secrets[TALER_CNC_KAPPA];
struct TALER_LinkSecretP link_secrets[TALER_CNC_KAPPA];
/**
* Number of coins we are melting
@ -595,7 +584,6 @@ serialize_fresh_coin (const struct FreshCoin *fc,
return sizeof (struct FreshCoinP) + bbuf_size;
}
fcp.coin_priv = fc->coin_priv;
fcp.link_secret = fc->link_secret;
fcp.bbuf_size = htonl ((uint32_t) bbuf_size);
memcpy (&buf[off],
&fcp,
@ -652,7 +640,6 @@ deserialize_fresh_coin (struct FreshCoin *fc,
return 0;
}
fc->coin_priv = fcp.coin_priv;
fc->link_secret = fcp.link_secret;
return sizeof (struct FreshCoinP) + bbuf_size;
}
@ -693,7 +680,7 @@ serialize_melt_data (const struct MeltData *md,
mdp = (struct MeltDataP *) buf;
mdp->melt_session_hash = md->melt_session_hash;
for (i=0;i<TALER_CNC_KAPPA;i++)
mdp->transfer_secrets[i] = md->transfer_secrets[i];
mdp->link_secrets[i] = md->link_secrets[i];
mdp->num_melted_coins = htons (md->num_melted_coins);
mdp->num_fresh_coins = htons (md->num_fresh_coins);
}
@ -743,7 +730,7 @@ deserialize_melt_data (const char *buf,
md = GNUNET_new (struct MeltData);
md->melt_session_hash = mdp.melt_session_hash;
for (i=0;i<TALER_CNC_KAPPA;i++)
md->transfer_secrets[i] = mdp.transfer_secrets[i];
md->link_secrets[i] = mdp.link_secrets[i];
md->num_melted_coins = ntohs (mdp.num_melted_coins);
md->num_fresh_coins = ntohs (mdp.num_fresh_coins);
md->melted_coins = GNUNET_new_array (md->num_melted_coins,
@ -803,9 +790,6 @@ setup_fresh_coin (struct FreshCoin *fc,
epk = GNUNET_CRYPTO_eddsa_key_create ();
fc->coin_priv.eddsa_priv = *epk;
GNUNET_free (epk);
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_STRONG,
&fc->link_secret,
sizeof (struct TALER_LinkSecretP));
len = GNUNET_CRYPTO_rsa_public_key_len (pk->key.rsa_public_key);
fc->blinding_key.rsa_blinding_key
= GNUNET_CRYPTO_rsa_blinding_key_create (len);
@ -869,11 +853,12 @@ TALER_MINT_refresh_prepare (unsigned int num_melts,
char *buf;
unsigned int i;
unsigned int j;
struct GNUNET_HashContext *hash_context;
for (i=0;i<TALER_CNC_KAPPA;i++)
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_STRONG,
&md.transfer_secrets[i],
sizeof (struct TALER_TransferSecretP));
&md.link_secrets[i],
sizeof (struct TALER_LinkSecretP));
md.num_melted_coins = num_melts;
md.num_fresh_coins = fresh_pks_len;
md.melted_coins = GNUNET_new_array (num_melts,
@ -911,10 +896,80 @@ TALER_MINT_refresh_prepare (unsigned int num_melts,
setup_fresh_coin (&md.fresh_coins[i][j],
&fresh_pks[j]);
}
// FIXME: compute melt_session_hash!
GNUNET_break (0); // FIXME: not implemented
/* now compute melt session hash */
hash_context = GNUNET_CRYPTO_hash_context_start ();
for (i=0;i<fresh_pks_len;i++)
{
char *buf;
size_t buf_size;
buf_size = GNUNET_CRYPTO_rsa_public_key_encode (fresh_pks[i].key.rsa_public_key,
&buf);
GNUNET_CRYPTO_hash_context_read (hash_context,
buf,
buf_size);
GNUNET_free (buf);
}
for (i=0;i<num_melts;i++)
{
struct TALER_CoinSpendPublicKeyP coin_pub;
struct TALER_AmountNBO melt_amount;
GNUNET_CRYPTO_eddsa_key_get_public (&melt_privs[i].eddsa_priv,
&coin_pub.eddsa_pub);
GNUNET_CRYPTO_hash_context_read (hash_context,
&coin_pub,
sizeof (struct TALER_CoinSpendPublicKeyP));
TALER_amount_hton (&melt_amount,
&melt_amounts[i]);
GNUNET_CRYPTO_hash_context_read (hash_context,
&melt_amount,
sizeof (struct TALER_AmountNBO));
}
for (i = 0; i < TALER_CNC_KAPPA; i++)
{
for (j = 0; j < fresh_pks_len; j++)
{
const struct FreshCoin *fc; /* coin this is about */
struct TALER_CoinSpendPublicKeyP coin_pub;
struct GNUNET_HashCode coin_hash;
char *coin_ev; /* blinded message to be signed (in envelope) for each coin */
size_t coin_ev_size;
struct TALER_RefreshLinkDecrypted rld;
struct TALER_RefreshLinkEncrypted *rle;
char *link_enc; /* encrypted link data */
size_t link_enc_size;
fc = &md.fresh_coins[i][j];
GNUNET_CRYPTO_eddsa_key_get_public (&fc->coin_priv.eddsa_priv,
&coin_pub.eddsa_pub);
GNUNET_CRYPTO_hash (&coin_pub.eddsa_pub,
sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
&coin_hash);
coin_ev_size = GNUNET_CRYPTO_rsa_blind (&coin_hash,
fc->blinding_key.rsa_blinding_key,
md.fresh_pks[j].rsa_public_key,
&coin_ev);
GNUNET_CRYPTO_hash_context_read (hash_context,
coin_ev,
coin_ev_size);
GNUNET_free (coin_ev);
rld.coin_priv = fc->coin_priv;
rld.blinding_key = fc->blinding_key;
rle = TALER_refresh_encrypt (&rld,
&md.link_secrets[i]);
link_enc = TALER_refresh_link_encrypted_encode (rle,
&link_enc_size);
GNUNET_CRYPTO_hash_context_read (hash_context,
link_enc,
link_enc_size);
GNUNET_free (link_enc);
}
}
buf = serialize_melt_data (&md,
res_size);
free_melt_data (&md);