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Make initialization of sprout validation key optional

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This makes the C interface behave like `zcash_proofs` and allows to
init the library without downloading the heavy sprout parameters.
In the special case where `librustzcash_init_zksnark_params` is called
with the sprout arguments path set to NULL and length set to 0, the
arguments are passed as None to `load_parameters`.
This commit is contained in:
Marco Stronati 2019-08-06 23:41:33 +02:00
parent 4255b44b21
commit 3891fe57d4
1 changed files with 28 additions and 13 deletions
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41
librustzcash/src/rustzcash.rs
View File

@ -143,9 +143,13 @@ pub extern "system" fn librustzcash_init_zksnark_params(
let output_path = Path::new(OsStr::from_bytes(unsafe {
slice::from_raw_parts(output_path, output_path_len)
}));
let sprout_path = Path::new(OsStr::from_bytes(unsafe {
slice::from_raw_parts(sprout_path, sprout_path_len)
}));
let sprout_path = if sprout_path.is_null() && sprout_path_len == 0 {
None
} else {
Some(Path::new(OsStr::from_bytes(unsafe {
slice::from_raw_parts(sprout_path, sprout_path_len)
})))
};
init_zksnark_params(
spend_path,
@ -174,8 +178,13 @@ pub extern "system" fn librustzcash_init_zksnark_params(
OsString::from_wide(unsafe { slice::from_raw_parts(spend_path, spend_path_len) });
let output_path =
OsString::from_wide(unsafe { slice::from_raw_parts(output_path, output_path_len) });
let sprout_path =
OsString::from_wide(unsafe { slice::from_raw_parts(sprout_path, sprout_path_len) });
let sprout_path = if sprout_path.is_null() && sprout_path_len == 0 {
None
} else {
Some(OsStr::from_wide(unsafe {
slice::from_raw_parts(sprout_path, sprout_path_len)
}))
};
init_zksnark_params(
Path::new(&spend_path),
@ -192,7 +201,7 @@ fn init_zksnark_params(
spend_hash: *const c_char,
output_path: &Path,
output_hash: *const c_char,
sprout_path: &Path,
sprout_path: Option<&Path>,
sprout_hash: *const c_char,
) {
// Initialize jubjub parameters here
@ -206,9 +215,15 @@ fn init_zksnark_params(
.to_str()
.expect("hash should be a valid string");
let sprout_hash = unsafe { CStr::from_ptr(sprout_hash) }
.to_str()
.expect("hash should be a valid string");
let sprout_hash_option = if sprout_path.is_none() {
None
} else {
Some(
unsafe { CStr::from_ptr(sprout_hash) }
.to_str()
.expect("hash should be a valid string"),
)
};
// Load params
let (spend_params, spend_vk, output_params, output_vk, sprout_vk) = load_parameters(
@ -216,8 +231,8 @@ fn init_zksnark_params(
spend_hash,
output_path,
output_hash,
Some(sprout_path),
Some(sprout_hash),
sprout_path,
sprout_hash_option,
);
// Caller is responsible for calling this function once, so
@ -225,11 +240,11 @@ fn init_zksnark_params(
unsafe {
SAPLING_SPEND_PARAMS = Some(spend_params);
SAPLING_OUTPUT_PARAMS = Some(output_params);
SPROUT_GROTH16_PARAMS_PATH = Some(sprout_path.to_owned());
SPROUT_GROTH16_PARAMS_PATH = sprout_path.map(|p| p.to_owned());
SAPLING_SPEND_VK = Some(spend_vk);
SAPLING_OUTPUT_VK = Some(output_vk);
SPROUT_GROTH16_VK = Some(sprout_vk.unwrap());
SPROUT_GROTH16_VK = sprout_vk;
}
}