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Panic if spending_key is given a seed shorter than 32 bytes

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This enforces the MUST requirement in ZIP 32. A panic is used instead of
an error because this should be considered an implementation error.
Ideally the type system would prevent this from occurring at all.

Closes #125.
This commit is contained in:
Jack Grigg 2019-09-17 18:03:58 +01:00
parent 2b6fbfd2d1
commit 9377b78b35
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1 changed files with 8 additions and 0 deletions
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8
zcash_client_backend/src/keys.rs
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@ -5,6 +5,10 @@ use zcash_primitives::zip32::{ChildIndex, ExtendedSpendingKey};
/// Derives the ZIP 32 [`ExtendedSpendingKey`] for a given coin type and account from the
/// given seed.
///
/// # Panics
///
/// Panics if `seed` is shorter than 32 bytes.
///
/// # Examples
///
/// ```
@ -13,6 +17,10 @@ use zcash_primitives::zip32::{ChildIndex, ExtendedSpendingKey};
/// let extsk = spending_key(&[0; 32][..], COIN_TYPE, 0);
/// ```
pub fn spending_key(seed: &[u8], coin_type: u32, account: u32) -> ExtendedSpendingKey {
if seed.len() < 32 {
panic!("ZIP 32 seeds MUST be at least 32 bytes");
}
ExtendedSpendingKey::from_path(
&ExtendedSpendingKey::master(&seed),
&[