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Improve from digest comment #711

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Jul 29, 2024
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Improve from digest comment #711

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6 changes: 4 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -66,12 +66,14 @@
//! ```rust
//! # #[cfg(feature = "alloc")] {
//! use secp256k1::{Secp256k1, Message, SecretKey, PublicKey};
//! # fn compute_hash(_: &[u8]) -> [u8; 32] { [0xab; 32] }
//!
//! let secp = Secp256k1::new();
//! let secret_key = SecretKey::from_slice(&[0xcd; 32]).expect("32 bytes, within curve order");
//! let public_key = PublicKey::from_secret_key(&secp, &secret_key);
//! // This is unsafe unless the supplied byte slice is the output of a cryptographic hash function.
//! let message = Message::from_digest([0xab; 32]);
//! // If the supplied byte slice was *not* the output of a cryptographic hash function this would
//! // be cryptographically broken. It has been trivially used in the past to execute attacks.
//! let message = Message::from_digest(compute_hash(b"CSW is not Satoshi"));
//!
//! let sig = secp.sign_ecdsa(&message, &secret_key);
//! assert!(secp.verify_ecdsa(&message, &sig, &public_key).is_ok());
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