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Use C calling convention for librustzcash

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The Rust-to-C++ interface speaks the C ABI. The "system" ABI happens to
be equivalent to the C ABI on the platforms we currently target (in
particular, we don't target win32 with an x86 architecture, which would
use the stdcall ABI).
This commit is contained in:
Jack Grigg 2019-11-04 17:48:44 +00:00
parent 720ee6476f
commit 0028048800
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GPG Key ID: 9E8255172BBF9898
1 changed files with 33 additions and 45 deletions
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78
librustzcash/src/rustzcash.rs
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@ -115,7 +115,7 @@ fn fixed_scalar_mult(from: &[u8], p_g: FixedGenerators) -> edwards::Point<Bls12,
#[cfg(not(target_os = "windows"))] #[cfg(not(target_os = "windows"))]
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_init_zksnark_params( pub extern "C" fn librustzcash_init_zksnark_params(
spend_path: *const u8, spend_path: *const u8,
spend_path_len: usize, spend_path_len: usize,
spend_hash: *const c_char, spend_hash: *const c_char,
@ -152,7 +152,7 @@ pub extern "system" fn librustzcash_init_zksnark_params(
#[cfg(target_os = "windows")] #[cfg(target_os = "windows")]
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_init_zksnark_params( pub extern "C" fn librustzcash_init_zksnark_params(
spend_path: *const u16, spend_path: *const u16,
spend_path_len: usize, spend_path_len: usize,
spend_hash: *const c_char, spend_hash: *const c_char,
@ -238,7 +238,7 @@ fn init_zksnark_params(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_tree_uncommitted(result: *mut [c_uchar; 32]) { pub extern "C" fn librustzcash_tree_uncommitted(result: *mut [c_uchar; 32]) {
let tmp = Note::<Bls12>::uncommitted().into_repr(); let tmp = Note::<Bls12>::uncommitted().into_repr();
// Should be okay, caller is responsible for ensuring the pointer // Should be okay, caller is responsible for ensuring the pointer
@ -249,7 +249,7 @@ pub extern "system" fn librustzcash_tree_uncommitted(result: *mut [c_uchar; 32])
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_merkle_hash( pub extern "C" fn librustzcash_merkle_hash(
depth: size_t, depth: size_t,
a: *const [c_uchar; 32], a: *const [c_uchar; 32],
b: *const [c_uchar; 32], b: *const [c_uchar; 32],
@ -275,10 +275,7 @@ pub extern "system" fn librustzcash_merkle_hash(
} }
#[no_mangle] // ToScalar #[no_mangle] // ToScalar
pub extern "system" fn librustzcash_to_scalar( pub extern "C" fn librustzcash_to_scalar(input: *const [c_uchar; 64], result: *mut [c_uchar; 32]) {
input: *const [c_uchar; 64],
result: *mut [c_uchar; 32],
) {
// Should be okay, because caller is responsible for ensuring // Should be okay, because caller is responsible for ensuring
// the pointer is a valid pointer to 32 bytes, and that is the // the pointer is a valid pointer to 32 bytes, and that is the
// size of the representation // size of the representation
@ -292,10 +289,7 @@ pub extern "system" fn librustzcash_to_scalar(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_ask_to_ak( pub extern "C" fn librustzcash_ask_to_ak(ask: *const [c_uchar; 32], result: *mut [c_uchar; 32]) {
ask: *const [c_uchar; 32],
result: *mut [c_uchar; 32],
) {
let ask = unsafe { &*ask }; let ask = unsafe { &*ask };
let ak = fixed_scalar_mult(ask, FixedGenerators::SpendingKeyGenerator); let ak = fixed_scalar_mult(ask, FixedGenerators::SpendingKeyGenerator);
@ -305,10 +299,7 @@ pub extern "system" fn librustzcash_ask_to_ak(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_nsk_to_nk( pub extern "C" fn librustzcash_nsk_to_nk(nsk: *const [c_uchar; 32], result: *mut [c_uchar; 32]) {
nsk: *const [c_uchar; 32],
result: *mut [c_uchar; 32],
) {
let nsk = unsafe { &*nsk }; let nsk = unsafe { &*nsk };
let nk = fixed_scalar_mult(nsk, FixedGenerators::ProofGenerationKey); let nk = fixed_scalar_mult(nsk, FixedGenerators::ProofGenerationKey);
@ -318,7 +309,7 @@ pub extern "system" fn librustzcash_nsk_to_nk(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_crh_ivk( pub extern "C" fn librustzcash_crh_ivk(
ak: *const [c_uchar; 32], ak: *const [c_uchar; 32],
nk: *const [c_uchar; 32], nk: *const [c_uchar; 32],
result: *mut [c_uchar; 32], result: *mut [c_uchar; 32],
@ -343,13 +334,13 @@ pub extern "system" fn librustzcash_crh_ivk(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_check_diversifier(diversifier: *const [c_uchar; 11]) -> bool { pub extern "C" fn librustzcash_check_diversifier(diversifier: *const [c_uchar; 11]) -> bool {
let diversifier = Diversifier(unsafe { *diversifier }); let diversifier = Diversifier(unsafe { *diversifier });
diversifier.g_d::<Bls12>(&JUBJUB).is_some() diversifier.g_d::<Bls12>(&JUBJUB).is_some()
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_ivk_to_pkd( pub extern "C" fn librustzcash_ivk_to_pkd(
ivk: *const [c_uchar; 32], ivk: *const [c_uchar; 32],
diversifier: *const [c_uchar; 11], diversifier: *const [c_uchar; 11],
result: *mut [c_uchar; 32], result: *mut [c_uchar; 32],
@ -390,7 +381,7 @@ fn test_gen_r() {
/// Return 32 byte random scalar, uniformly. /// Return 32 byte random scalar, uniformly.
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_generate_r(result: *mut [c_uchar; 32]) { pub extern "C" fn librustzcash_sapling_generate_r(result: *mut [c_uchar; 32]) {
// create random 64 byte buffer // create random 64 byte buffer
let mut rng = OsRng; let mut rng = OsRng;
let mut buffer = [0u8; 64]; let mut buffer = [0u8; 64];
@ -445,7 +436,7 @@ fn priv_get_note(
/// Compute Sapling note nullifier. /// Compute Sapling note nullifier.
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_compute_nf( pub extern "C" fn librustzcash_sapling_compute_nf(
diversifier: *const [c_uchar; 11], diversifier: *const [c_uchar; 11],
pk_d: *const [c_uchar; 32], pk_d: *const [c_uchar; 32],
value: u64, value: u64,
@ -490,7 +481,7 @@ pub extern "system" fn librustzcash_sapling_compute_nf(
/// Compute Sapling note commitment. /// Compute Sapling note commitment.
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_compute_cm( pub extern "C" fn librustzcash_sapling_compute_cm(
diversifier: *const [c_uchar; 11], diversifier: *const [c_uchar; 11],
pk_d: *const [c_uchar; 32], pk_d: *const [c_uchar; 32],
value: u64, value: u64,
@ -509,7 +500,7 @@ pub extern "system" fn librustzcash_sapling_compute_cm(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_ka_agree( pub extern "C" fn librustzcash_sapling_ka_agree(
p: *const [c_uchar; 32], p: *const [c_uchar; 32],
sk: *const [c_uchar; 32], sk: *const [c_uchar; 32],
result: *mut [c_uchar; 32], result: *mut [c_uchar; 32],
@ -537,7 +528,7 @@ pub extern "system" fn librustzcash_sapling_ka_agree(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_ka_derivepublic( pub extern "C" fn librustzcash_sapling_ka_derivepublic(
diversifier: *const [c_uchar; 11], diversifier: *const [c_uchar; 11],
esk: *const [c_uchar; 32], esk: *const [c_uchar; 32],
result: *mut [c_uchar; 32], result: *mut [c_uchar; 32],
@ -565,7 +556,7 @@ pub extern "system" fn librustzcash_sapling_ka_derivepublic(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_eh_isvalid( pub extern "C" fn librustzcash_eh_isvalid(
n: u32, n: u32,
k: u32, k: u32,
input: *const c_uchar, input: *const c_uchar,
@ -585,17 +576,14 @@ pub extern "system" fn librustzcash_eh_isvalid(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_verification_ctx_init( pub extern "C" fn librustzcash_sapling_verification_ctx_init() -> *mut SaplingVerificationContext {
) -> *mut SaplingVerificationContext {
let ctx = Box::new(SaplingVerificationContext::new()); let ctx = Box::new(SaplingVerificationContext::new());
Box::into_raw(ctx) Box::into_raw(ctx)
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_verification_ctx_free( pub extern "C" fn librustzcash_sapling_verification_ctx_free(ctx: *mut SaplingVerificationContext) {
ctx: *mut SaplingVerificationContext,
) {
drop(unsafe { Box::from_raw(ctx) }); drop(unsafe { Box::from_raw(ctx) });
} }
@ -604,7 +592,7 @@ const GROTH_PROOF_SIZE: usize = 48 // π_A
+ 48; // π_C + 48; // π_C
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_check_spend( pub extern "C" fn librustzcash_sapling_check_spend(
ctx: *mut SaplingVerificationContext, ctx: *mut SaplingVerificationContext,
cv: *const [c_uchar; 32], cv: *const [c_uchar; 32],
anchor: *const [c_uchar; 32], anchor: *const [c_uchar; 32],
@ -659,7 +647,7 @@ pub extern "system" fn librustzcash_sapling_check_spend(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_check_output( pub extern "C" fn librustzcash_sapling_check_output(
ctx: *mut SaplingVerificationContext, ctx: *mut SaplingVerificationContext,
cv: *const [c_uchar; 32], cv: *const [c_uchar; 32],
cm: *const [c_uchar; 32], cm: *const [c_uchar; 32],
@ -702,7 +690,7 @@ pub extern "system" fn librustzcash_sapling_check_output(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_final_check( pub extern "C" fn librustzcash_sapling_final_check(
ctx: *mut SaplingVerificationContext, ctx: *mut SaplingVerificationContext,
value_balance: i64, value_balance: i64,
binding_sig: *const [c_uchar; 64], binding_sig: *const [c_uchar; 64],
@ -728,7 +716,7 @@ pub extern "system" fn librustzcash_sapling_final_check(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sprout_prove( pub extern "C" fn librustzcash_sprout_prove(
proof_out: *mut [c_uchar; GROTH_PROOF_SIZE], proof_out: *mut [c_uchar; GROTH_PROOF_SIZE],
phi: *const [c_uchar; 32], phi: *const [c_uchar; 32],
@ -877,7 +865,7 @@ pub extern "system" fn librustzcash_sprout_prove(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sprout_verify( pub extern "C" fn librustzcash_sprout_verify(
proof: *const [c_uchar; GROTH_PROOF_SIZE], proof: *const [c_uchar; GROTH_PROOF_SIZE],
rt: *const [c_uchar; 32], rt: *const [c_uchar; 32],
h_sig: *const [c_uchar; 32], h_sig: *const [c_uchar; 32],
@ -926,7 +914,7 @@ pub extern "system" fn librustzcash_sprout_verify(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_output_proof( pub extern "C" fn librustzcash_sapling_output_proof(
ctx: *mut SaplingProvingContext, ctx: *mut SaplingProvingContext,
esk: *const [c_uchar; 32], esk: *const [c_uchar; 32],
payment_address: *const [c_uchar; 43], payment_address: *const [c_uchar; 43],
@ -978,7 +966,7 @@ pub extern "system" fn librustzcash_sapling_output_proof(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_spend_sig( pub extern "C" fn librustzcash_sapling_spend_sig(
ask: *const [c_uchar; 32], ask: *const [c_uchar; 32],
ar: *const [c_uchar; 32], ar: *const [c_uchar; 32],
sighash: *const [c_uchar; 32], sighash: *const [c_uchar; 32],
@ -1010,7 +998,7 @@ pub extern "system" fn librustzcash_sapling_spend_sig(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_binding_sig( pub extern "C" fn librustzcash_sapling_binding_sig(
ctx: *const SaplingProvingContext, ctx: *const SaplingProvingContext,
value_balance: i64, value_balance: i64,
sighash: *const [c_uchar; 32], sighash: *const [c_uchar; 32],
@ -1035,7 +1023,7 @@ pub extern "system" fn librustzcash_sapling_binding_sig(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_spend_proof( pub extern "C" fn librustzcash_sapling_spend_proof(
ctx: *mut SaplingProvingContext, ctx: *mut SaplingProvingContext,
ak: *const [c_uchar; 32], ak: *const [c_uchar; 32],
nsk: *const [c_uchar; 32], nsk: *const [c_uchar; 32],
@ -1135,19 +1123,19 @@ pub extern "system" fn librustzcash_sapling_spend_proof(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_proving_ctx_init() -> *mut SaplingProvingContext { pub extern "C" fn librustzcash_sapling_proving_ctx_init() -> *mut SaplingProvingContext {
let ctx = Box::new(SaplingProvingContext::new()); let ctx = Box::new(SaplingProvingContext::new());
Box::into_raw(ctx) Box::into_raw(ctx)
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_sapling_proving_ctx_free(ctx: *mut SaplingProvingContext) { pub extern "C" fn librustzcash_sapling_proving_ctx_free(ctx: *mut SaplingProvingContext) {
drop(unsafe { Box::from_raw(ctx) }); drop(unsafe { Box::from_raw(ctx) });
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_zip32_xsk_master( pub extern "C" fn librustzcash_zip32_xsk_master(
seed: *const c_uchar, seed: *const c_uchar,
seedlen: size_t, seedlen: size_t,
xsk_master: *mut [c_uchar; 169], xsk_master: *mut [c_uchar; 169],
@ -1161,7 +1149,7 @@ pub extern "system" fn librustzcash_zip32_xsk_master(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_zip32_xsk_derive( pub extern "C" fn librustzcash_zip32_xsk_derive(
xsk_parent: *const [c_uchar; 169], xsk_parent: *const [c_uchar; 169],
i: u32, i: u32,
xsk_i: *mut [c_uchar; 169], xsk_i: *mut [c_uchar; 169],
@ -1177,7 +1165,7 @@ pub extern "system" fn librustzcash_zip32_xsk_derive(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_zip32_xfvk_derive( pub extern "C" fn librustzcash_zip32_xfvk_derive(
xfvk_parent: *const [c_uchar; 169], xfvk_parent: *const [c_uchar; 169],
i: u32, i: u32,
xfvk_i: *mut [c_uchar; 169], xfvk_i: *mut [c_uchar; 169],
@ -1198,7 +1186,7 @@ pub extern "system" fn librustzcash_zip32_xfvk_derive(
} }
#[no_mangle] #[no_mangle]
pub extern "system" fn librustzcash_zip32_xfvk_address( pub extern "C" fn librustzcash_zip32_xfvk_address(
xfvk: *const [c_uchar; 169], xfvk: *const [c_uchar; 169],
j: *const [c_uchar; 11], j: *const [c_uchar; 11],
j_ret: *mut [c_uchar; 11], j_ret: *mut [c_uchar; 11],