brine-ed25519

A fast, low-overhead, Ed25519 signature verification library for the Solana SVM.

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⚡ Performance

Operation	CU (Approx.)
sig_verify	~30,000

These value was measured inside the Solana SVM (via test programs), it depends on the size of the data (32 bytes in this case).

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✨ Features

• Verifies Ed25519 signatures within the program, at run-time
• Fully supports dynamically generated messages
• No extra lamports required

Signature verification roughly follows RFC 8032

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🧱 Use Cases

• Signed content or metadata validation
• Meta-transactions & gasless relays
• Custom auth with off-chain signatures
• Cross-chain validator proof verification
• Oracle data integrity checks
• Decentralized identity & DID claims

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🚀 Quick Start

use brine_ed25519::sig_verify;

let pubkey: [u8; 32] = [...];
let sig: [u8; 64] = [...];
let message = b"hello world";

sig_verify(&pubkey, &sig, message)?;

Returns Ok(()) if valid, or Err(SignatureError) if the signature is invalid.

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🧠 But why?

Q: Why not use the native Ed25519 program?

A: Solana does provide a Ed25519 pre-compile program for signature verification—but it comes with several downsides:

• Charges an extra 5000 lamports per signature
• Requires the instruction_sysvar to be passed into your program
• Only verifies signatures on data hardcoded into the transaction
• Cannot be used with dynamically generated data inside your program
• Has cumbersome devex

This crate, brine-ed25519, solves all of that.

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🔐 Security

This implementation is pulled from code-vm (MIT-licensed), which was written and maintained by the author of this crate.

• ✅ Reviewed as part of the code-vm audit by OtterSec
• ✅ Peer reviewed by @stegaBOB and @deanmlittle

Big thanks to both reviewers for helpful suggestions and CU reductions!

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🙌 Contributing

Contributions are welcome! Please open issues or PRs on the GitHub repo.