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sign_blinded implementation

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This commit is contained in:
Gian Demarmels 2021-12-23 10:58:03 +01:00
parent f1ec1e70a0
commit 5d2157a8f6
No known key found for this signature in database
GPG Key ID: 030CEDDCCC92D778
4 changed files with 49 additions and 9 deletions
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3
src/include/taler_crypto_lib.h
View File

@ -1077,7 +1077,8 @@ TALER_denom_blind (const struct TALER_DenominationPublicKey *dk,
enum GNUNET_GenericReturnValue
TALER_denom_sign_blinded (struct TALER_BlindedDenominationSignature *denom_sig,
const struct TALER_DenominationPrivateKey *denom_priv,
const struct TALER_BlindedPlanchet *blinded_planchet);
const struct TALER_BlindedPlanchet *blinded_planchet,
...);
/**

6
src/util/crypto.c
View File

@ -212,8 +212,6 @@ TALER_blinding_secret_create (union TALER_DenominationBlindingKeyP *bs,
enum TALER_DenominationCipher cipher,
...)
{
va_list ap;
va_start (ap, cipher);
switch (cipher)
{
case TALER_DENOMINATION_INVALID:
@ -227,6 +225,8 @@ TALER_blinding_secret_create (union TALER_DenominationBlindingKeyP *bs,
return;
case TALER_DENOMINATION_CS:
{
va_list ap;
va_start (ap, cipher);
struct TALER_CoinSpendPrivateKeyP *coin_priv;
struct TALER_DenominationCsPublicR *r_pub;
coin_priv = va_arg (ap, struct TALER_CoinSpendPrivateKeyP *);
@ -235,12 +235,12 @@ TALER_blinding_secret_create (union TALER_DenominationBlindingKeyP *bs,
cs_blinding_seed_derive (coin_priv,
r_pub->r_pub,
&bs->nonce);
va_end (ap);
return;
}
default:
GNUNET_break (0);
}
va_end (ap);
}

29
src/util/denom.c
View File

@ -125,7 +125,8 @@ TALER_denom_cs_derive_r_public (const struct TALER_WithdrawNonce *nonce,
enum GNUNET_GenericReturnValue
TALER_denom_sign_blinded (struct TALER_BlindedDenominationSignature *denom_sig,
const struct TALER_DenominationPrivateKey *denom_priv,
const struct TALER_BlindedPlanchet *blinded_planchet)
const struct TALER_BlindedPlanchet *blinded_planchet,
...)
{
memset (denom_sig,
0,
@ -148,7 +149,31 @@ TALER_denom_sign_blinded (struct TALER_BlindedDenominationSignature *denom_sig,
}
denom_sig->cipher = TALER_DENOMINATION_RSA;
return GNUNET_OK;
// TODO: add case for Clause-Schnorr
case TALER_DENOMINATION_CS:
{
va_list ap;
va_start (ap, blinded_planchet);
struct TALER_WithdrawNonce *nonce;
nonce = va_arg (ap, struct TALER_WithdrawNonce *);
struct GNUNET_CRYPTO_CsRSecret r[2];
GNUNET_CRYPTO_cs_r_derive (&nonce->nonce,
&denom_priv->details.cs_private_key,
r);
denom_sig->details.blinded_cs_answer.b =
GNUNET_CRYPTO_cs_sign_derive (&denom_priv->details.cs_private_key,
r,
blinded_planchet->details.
cs_blinded_planchet.c,
&nonce->nonce,
&denom_sig->details.blinded_cs_answer.
s_scalar);
denom_sig->cipher = TALER_DENOMINATION_CS;
va_end (ap);
}
return GNUNET_OK;
default:
GNUNET_break (0);
}

20
src/util/test_crypto.c
View File

@ -148,9 +148,10 @@ test_planchets_cs (void)
struct TALER_CoinPubHash c_hash;
struct TALER_WithdrawNonce nonce;
struct TALER_DenominationCsPublicR r_pub;
struct TALER_DenominationCsPublicR r_pub_blind;
struct TALER_DenominationCsPrivateR priv_r;
// struct TALER_BlindedDenominationSignature blind_sig;
// struct TALER_FreshCoin coin;
struct TALER_BlindedDenominationSignature blind_sig;
struct TALER_FreshCoin coin;
GNUNET_assert (GNUNET_OK ==
TALER_denom_priv_create (&dk_priv,
@ -175,12 +176,25 @@ test_planchets_cs (void)
&pd,
&nonce,
&r_pub));
// TODO: Remove r_secret if not needed
GNUNET_assert (GNUNET_OK ==
TALER_denom_cs_derive_r_secret (&nonce,
&dk_priv,
&priv_r));
GNUNET_assert (GNUNET_OK ==
TALER_denom_sign_blinded (&blind_sig,
&dk_priv,
&pd.blinded_planchet,
&nonce));
// TALER_blinded_denom_sig_free (&blind_sig);
// GNUNET_assert (GNUNET_OK ==
// TALER_planchet_to_coin (&dk_pub,
// &blind_sig,
// &ps,
// &c_hash,
// &coin));
TALER_blinded_denom_sig_free (&blind_sig);
// TALER_denom_sig_free (&coin.sig);
TALER_denom_priv_free (&dk_priv);
TALER_denom_pub_free (&dk_pub);