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[taler-exchange] branch master updated: crypto implementation
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From: |
gnunet |
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Subject: |
[taler-exchange] branch master updated: crypto implementation |
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Date: |
Sat, 05 Feb 2022 00:33:24 +0100 |
This is an automated email from the git hooks/post-receive script.
gian-demarmels pushed a commit to branch master
in repository exchange.
The following commit(s) were added to refs/heads/master by this push:
new c42376cf crypto implementation
new f46dc9ea Merge branch 'master' of ssh://git.taler.net/exchange
c42376cf is described below
commit c42376cf400b59006fa9ed0a195c014d10c7eca1
Author: Gian Demarmels <gian@demarmels.org>
AuthorDate: Sat Feb 5 00:32:53 2022 +0100
crypto implementation
---
src/include/taler_crypto_lib.h | 101 ++++++++++++++++++----------------
src/lib/exchange_api_withdraw.c | 6 ++
src/util/crypto.c | 119 ++++++++++++++++++++++------------------
3 files changed, 126 insertions(+), 100 deletions(-)
diff --git a/src/include/taler_crypto_lib.h b/src/include/taler_crypto_lib.h
index 62c9191a..0783b1e8 100644
--- a/src/include/taler_crypto_lib.h
+++ b/src/include/taler_crypto_lib.h
@@ -455,6 +455,25 @@ struct TALER_RsaPubHashP
struct GNUNET_HashCode hash;
};
+GNUNET_NETWORK_STRUCT_BEGIN
+
+/**
+ * Master key material for the deriviation of
+ * private coins and blinding factors.
+ */
+struct TALER_PlanchetSecretsP
+{
+
+ /**
+ * Key material.
+ */
+ uint32_t key_data[8];
+
+};
+
+
+GNUNET_NETWORK_STRUCT_END
+
/**
* Hash @a rsa.
@@ -990,11 +1009,14 @@ TALER_denom_pub_free (struct TALER_DenominationPublicKey
*denom_pub);
/**
* Create private key for a Taler coin.
- *
+ * @param ps planchet secret to derive coin priv key
+ * @param alg_values includes algorithm specific values
* @param[out] coin_priv private key to initialize
*/
void
TALER_planchet_setup_coin_priv (
+ const struct TALER_PlanchetSecretsP *ps,
+ const struct TALER_ExchangeWithdrawValues *alg_values,
struct TALER_CoinSpendPrivateKeyP *coin_priv);
@@ -1302,27 +1324,6 @@ void
TALER_payto_hash (const char *payto,
struct TALER_PaytoHash *h_payto);
-
-GNUNET_NETWORK_STRUCT_BEGIN
-
-/**
- * Master key material for the deriviation of
- * private coins and blinding factors.
- */
-struct TALER_PlanchetSecretsP
-{
-
- /**
- * Key material.
- */
- uint32_t key_data[8];
-
-};
-
-
-GNUNET_NETWORK_STRUCT_END
-
-
/**
* Details about a planchet that the customer wants to obtain
* a withdrawal authorization. This is the information that
@@ -1465,10 +1466,10 @@ GNUNET_NETWORK_STRUCT_END
* @param[out] ps value to initialize
*/
void
-XXXTALER_planchet_setup_refresh (const struct
- TALER_TransferSecretP *secret_seed,
- uint32_t coin_num_salt,
- struct TALER_PlanchetSecretsP *ps);
+TALER_planchet_setup_refresh (const struct TALER_TransferSecretP *secret_seed,
+ uint32_t coin_num_salt,
+ struct TALER_CoinSpendPrivateKeyP *coin_priv,
+ union TALER_DenominationBlindingKeyP *bks);
/**
@@ -1485,21 +1486,25 @@ TALER_planchet_setup_random (
/**
* Create a blinding secret @a bs for @a cipher.
*
- * @param[out] ps planchet with blinding secret to initialize
+ * @param ps secret to derive blindings from
* @param alg_values withdraw values containing cipher and additional CS values
+ * @param bks blinding secrets
*/
void
-XXXTALER_planchet_blinding_secret_create (struct TALER_PlanchetSecretsP *ps,
- const struct
- TALER_ExchangeWithdrawValues *
- alg_values);
+TALER_planchet_blinding_secret_create (const struct TALER_PlanchetSecretsP *ps,
+
+ const struct
+ TALER_ExchangeWithdrawValues
*alg_values,
+ union TALER_DenominationBlindingKeyP
*bks);
/**
* Prepare a planchet for tipping. Creates and blinds a coin.
*
* @param dk denomination key for the coin to be created
- * @param ps secret planchet internals (for #TALER_planchet_to_coin)
+ * @param alg_values algorithm specific values
+ * @param bks blinding secrets
+ * @param coin_priv coin private key
* @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, pd->blinded_planchet.cipher will
be set
@@ -1507,12 +1512,13 @@ XXXTALER_planchet_blinding_secret_create (struct
TALER_PlanchetSecretsP *ps,
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
-XXXTALER_planchet_prepare (const struct TALER_DenominationPublicKey *dk,
- const struct
- TALER_ExchangeWithdrawValues *alg_values,
- struct TALER_PlanchetSecretsP *ps,
- struct TALER_CoinPubHash *c_hash,
- struct TALER_PlanchetDetail *pd);
+TALER_planchet_prepare (const struct TALER_DenominationPublicKey *dk,
+ const struct TALER_ExchangeWithdrawValues *alg_values,
+ const union TALER_DenominationBlindingKeyP *bks,
+ const struct TALER_CoinSpendPrivateKeyP *coin_priv,
+ struct TALER_CoinPubHash *c_hash,
+ struct TALER_PlanchetDetail *pd
+ );
/**
@@ -1531,20 +1537,21 @@ TALER_blinded_planchet_free (struct
TALER_BlindedPlanchet *blinded_planchet);
*
* @param dk denomination key, must match what was given to
#TALER_planchet_prepare()
* @param blind_sig blind signature from the exchange
- * @param ps secrets from #TALER_planchet_prepare()
+ * @param bks blinding key secret
+ * @param coin_priv private key of the coin
* @param c_hash hash of the coin's public key for verification of the
signature
* @param[out] coin set to the details of the fresh coin
* @return #GNUNET_OK on success
*/
enum GNUNET_GenericReturnValue
-XXXTALER_planchet_to_coin (const struct TALER_DenominationPublicKey *dk,
- const struct
- TALER_BlindedDenominationSignature *blind_sig,
- const struct TALER_PlanchetSecretsP *ps,
- const struct TALER_CoinPubHash *c_hash,
- const struct
- TALER_ExchangeWithdrawValues *alg_values,
- struct TALER_FreshCoin *coin);
+TALER_planchet_to_coin (const struct TALER_DenominationPublicKey *dk,
+ const struct
+ TALER_BlindedDenominationSignature *blind_sig,
+ const union TALER_DenominationBlindingKeyP *bks,
+ const struct TALER_CoinSpendPrivateKeyP *coin_priv,
+ const struct TALER_CoinPubHash *c_hash,
+ const struct TALER_ExchangeWithdrawValues *alg_values,
+ struct TALER_FreshCoin *coin);
/* ****************** Refresh crypto primitives ************* */
diff --git a/src/lib/exchange_api_withdraw.c b/src/lib/exchange_api_withdraw.c
index 7b851b49..477af544 100644
--- a/src/lib/exchange_api_withdraw.c
+++ b/src/lib/exchange_api_withdraw.c
@@ -242,9 +242,15 @@ TALER_EXCHANGE_withdraw (
TALER_denom_pub_deep_copy (&wh->pk.key,
&pk->key);
+
switch (pk->key.cipher)
{
case TALER_DENOMINATION_RSA:
+ struct TALER_CoinSpendPrivateKeyP priv;
+ alg_values.cipher = TALER_DENOMINATION_RSA;
+
+ TALER_planchet_setup_coin_priv (ps, &wh->alg_values, &priv);
+
if (GNUNET_OK !=
TALER_planchet_prepare (&pk->key,
&wh->alg_values,
diff --git a/src/util/crypto.c b/src/util/crypto.c
index 18f809e3..4363c561 100644
--- a/src/util/crypto.c
+++ b/src/util/crypto.c
@@ -149,13 +149,19 @@ TALER_link_recover_transfer_secret (
void
TALER_planchet_setup_refresh (const struct TALER_TransferSecretP *secret_seed,
uint32_t coin_num_salt,
- struct TALER_PlanchetSecretsP *ps)
+ struct TALER_CoinSpendPrivateKeyP *coin_priv,
+ union TALER_DenominationBlindingKeyP *bks)
{
uint32_t be_salt = htonl (coin_num_salt);
+ struct
+ {
+ struct TALER_CoinSpendPrivateKeyP coin_priv;
+ union TALER_DenominationBlindingKeyP bks;
+ } out;
GNUNET_assert (GNUNET_OK ==
- GNUNET_CRYPTO_kdf (ps,
- sizeof (*ps),
+ GNUNET_CRYPTO_kdf (&out,
+ sizeof (out),
&be_salt,
sizeof (be_salt),
secret_seed,
@@ -163,12 +169,14 @@ TALER_planchet_setup_refresh (const struct
TALER_TransferSecretP *secret_seed,
"taler-coin-derivation",
strlen ("taler-coin-derivation"),
NULL, 0));
+ *coin_priv = out.coin_priv;
+ *bks = out.bks;
}
void
cs_blinding_seed_derive (const struct
- TALER_CoinSpendPrivateKeyP *coin_priv,
+ TALER_PlanchetSecretsP *ps,
const struct GNUNET_CRYPTO_CsRPublic r_pub[2],
struct GNUNET_CRYPTO_CsNonce *blind_seed)
{
@@ -179,8 +187,8 @@ cs_blinding_seed_derive (const struct
GCRY_MD_SHA256,
"bseed",
strlen ("bseed"),
- coin_priv,
- sizeof(*coin_priv),
+ ps,
+ sizeof(*ps),
r_pub,
sizeof(struct GNUNET_CRYPTO_CsRPublic) *
2,
NULL,
@@ -217,9 +225,11 @@ TALER_cs_withdraw_nonce_generate (struct TALER_CsNonce
*nonce)
void
-TALER_planchet_blinding_secret_create (struct TALER_PlanchetSecretsP *ps,
+TALER_planchet_blinding_secret_create (const struct TALER_PlanchetSecretsP *ps,
+
const struct
- TALER_ExchangeWithdrawValues
*alg_values)
+ TALER_ExchangeWithdrawValues
*alg_values,
+ union TALER_DenominationBlindingKeyP
*bks)
{
switch (alg_values->cipher)
{
@@ -227,16 +237,26 @@ TALER_planchet_blinding_secret_create (struct
TALER_PlanchetSecretsP *ps,
GNUNET_break (0);
return;
case TALER_DENOMINATION_RSA:
- GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_STRONG,
- &ps->blinding_key.rsa_bks,
- sizeof (struct
- GNUNET_CRYPTO_RsaBlindingKeySecret));
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CRYPTO_hkdf (&bks->rsa_bks,
+ sizeof (struct
+
GNUNET_CRYPTO_RsaBlindingKeySecret),
+ GCRY_MD_SHA512,
+ GCRY_MD_SHA256,
+ "bks",
+ strlen ("bks"),
+ ps,
+ sizeof(*ps),
+ &alg_values->details, /* Could be null
on RSA case*/
+ sizeof(alg_values->details),
+ NULL,
+ 0));
return;
case TALER_DENOMINATION_CS:
{
- cs_blinding_seed_derive (&ps->coin_priv,
+ cs_blinding_seed_derive (ps,
alg_values->details.cs_values.r_pub.r_pub,
- &ps->blinding_key.nonce);
+ &bks->nonce);
return;
}
default:
@@ -247,51 +267,43 @@ TALER_planchet_blinding_secret_create (struct
TALER_PlanchetSecretsP *ps,
void
TALER_planchet_setup_coin_priv (
+ const struct TALER_PlanchetSecretsP *ps,
+ const struct TALER_ExchangeWithdrawValues *alg_values,
struct TALER_CoinSpendPrivateKeyP *coin_priv)
{
- GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_STRONG,
- coin_priv,
- sizeof (*coin_priv));
- // FIXME-jeff/dold: Clamping?
-}
-
-
-void
-TALER_planchet_setup_random (
- struct TALER_PlanchetSecretsP *ps,
- const struct TALER_ExchangeWithdrawValues *alg_values)
-{
- TALER_planchet_setup_coin_priv (&ps->coin_priv);
- switch (alg_values->cipher)
- {
- case TALER_DENOMINATION_INVALID:
- GNUNET_break (0);
- return;
- case TALER_DENOMINATION_RSA:
- TALER_planchet_blinding_secret_create (ps,
- alg_values);
- return;
- case TALER_DENOMINATION_CS:
- // Will be set in a later stage for Clause Blind Schnorr Scheme
- return;
- default:
- GNUNET_break (0);
- }
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CRYPTO_hkdf (coin_priv,
+ sizeof (*coin_priv),
+ GCRY_MD_SHA512,
+ GCRY_MD_SHA256,
+ "coin",
+ strlen ("coin"),
+ ps,
+ sizeof(*ps),
+ &alg_values->details, /* Could be null on
RSA case*/
+ sizeof(alg_values->details),
+ NULL,
+ 0));
+ coin_priv->eddsa_priv.d[0] &= 248;
+ coin_priv->eddsa_priv.d[31] &= 127;
+ coin_priv->eddsa_priv.d[31] |= 64;
}
enum GNUNET_GenericReturnValue
TALER_planchet_prepare (const struct TALER_DenominationPublicKey *dk,
const struct TALER_ExchangeWithdrawValues *alg_values,
- struct TALER_PlanchetSecretsP *ps,
+ const union TALER_DenominationBlindingKeyP *bks,
+ const struct TALER_CoinSpendPrivateKeyP *coin_priv,
struct TALER_CoinPubHash *c_hash,
- struct TALER_PlanchetDetail *pd)
+ struct TALER_PlanchetDetail *pd
+ )
{
struct TALER_CoinSpendPublicKeyP coin_pub;
GNUNET_assert (alg_values->cipher == dk->cipher);
- GNUNET_CRYPTO_eddsa_key_get_public (&ps->coin_priv.eddsa_priv,
+ GNUNET_CRYPTO_eddsa_key_get_public (&coin_priv->eddsa_priv,
&coin_pub.eddsa_pub);
switch (dk->cipher)
@@ -299,7 +311,7 @@ TALER_planchet_prepare (const struct
TALER_DenominationPublicKey *dk,
case TALER_DENOMINATION_RSA:
if (GNUNET_OK !=
TALER_denom_blind (dk,
- &ps->blinding_key,
+ bks,
NULL, /* FIXME-Oec */
&coin_pub,
alg_values,
@@ -313,8 +325,8 @@ TALER_planchet_prepare (const struct
TALER_DenominationPublicKey *dk,
case TALER_DENOMINATION_CS:
if (GNUNET_OK !=
TALER_denom_blind (dk,
- &ps->blinding_key,
- NULL, /* FIXME-Oec */
+ bks,
+ NULL, /* FIXME-Oec */
&coin_pub,
alg_values,
c_hash,
@@ -357,7 +369,8 @@ enum GNUNET_GenericReturnValue
TALER_planchet_to_coin (const struct TALER_DenominationPublicKey *dk,
const struct
TALER_BlindedDenominationSignature *blind_sig,
- const struct TALER_PlanchetSecretsP *ps,
+ const union TALER_DenominationBlindingKeyP *bks,
+ const struct TALER_CoinSpendPrivateKeyP *coin_priv,
const struct TALER_CoinPubHash *c_hash,
const struct TALER_ExchangeWithdrawValues *alg_values,
struct TALER_FreshCoin *coin)
@@ -377,7 +390,7 @@ TALER_planchet_to_coin (const struct
TALER_DenominationPublicKey *dk,
if (GNUNET_OK !=
TALER_denom_sig_unblind (&sig,
blind_sig,
- &ps->blinding_key,
+ bks,
dk))
{
GNUNET_break_op (0);
@@ -390,7 +403,7 @@ TALER_planchet_to_coin (const struct
TALER_DenominationPublicKey *dk,
struct GNUNET_CRYPTO_CsBlindingSecret bs[2];
struct TALER_DenominationCsPublicR r_pub_blind;
- GNUNET_CRYPTO_cs_blinding_secrets_derive (&ps->blinding_key.nonce, bs);
+ GNUNET_CRYPTO_cs_blinding_secrets_derive (&bks->nonce, bs);
GNUNET_CRYPTO_cs_calc_blinded_c (bs,
alg_values->details.cs_values.r_pub.r_pub,
@@ -406,7 +419,7 @@ TALER_planchet_to_coin (const struct
TALER_DenominationPublicKey *dk,
if (GNUNET_OK !=
TALER_denom_sig_unblind (&sig,
blind_sig,
- &ps->blinding_key,
+ bks,
dk))
{
GNUNET_break_op (0);
@@ -430,7 +443,7 @@ TALER_planchet_to_coin (const struct
TALER_DenominationPublicKey *dk,
}
coin->sig = sig;
- coin->coin_priv = ps->coin_priv;
+ coin->coin_priv = *coin_priv;
return GNUNET_OK;
}
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