crypto-primitives
Implementation and secure usage of cryptographic primitives including ECDSA, BLS, Schnorr signatures, key derivation, secret sharing, and constant-time operations. Provides guidance for secure cryptographic implementations in blockchain applications.
npx skills add a5c-ai/babysitter --skill crypto-primitives --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Cryptographic Primitives Skill Expert implementation and usage of cryptographic primitives for blockchain and security applications. ## Capabilities - **Digital Signatures**: ECDSA, BLS, Schnorr signature implementation and verification - **Key Derivation**: BIP-32/39/44 hierarchical deterministic key generation - **Threshold Cryptography**: Shamir secret sharing, threshold signatures - **Hash Functions**: Secure usage of Keccak, Poseidon, MiMC, Pedersen - **Commitments**: Pedersen commitments, hash commitments - **Secure Randomness**: CSPRNG usage, VRF integration - **Constant-Time Operations**: Side-channel resistant implementations ## Signature Schemes ### ECDSA (secp256k1) Standard Ethereum signature scheme: ```javascript import { secp256k1 } from '@noble/curves/secp256k1'; import { keccak_256 } from '@noble/hashes/sha3'; // Sign message const messageHash = keccak_256(message); const signature = secp256k1.sign(messageHash, privateKey); // Verify signature const isValid = secp256k1.verify(signature, messageHash, publicKey); // Recover public key from signature (Ethereum style) const recoveredPubKey = signature.recoverPublicKey(messageHash); ``` ### BLS Signatures (BLS12-381) A
- Capabilities
- Signature Schemes
- ECDSA (secp256k1)
- BLS Signatures (BLS12-381)
- Schnorr Signatures
- Key Derivation
- BIP-32 HD Wallet
- BIP-39 Mnemonic
- Secret Sharing
- Shamir's Secret Sharing
- Feldman VSS (Verifiable Secret Sharing)
- Hash Functions
- Ethereum-Specific
- ZK-Friendly Hashes
What does the crypto-primitives skill do?
Implementation and secure usage of cryptographic primitives including ECDSA, BLS, Schnorr signatures, key derivation, secret sharing, and constant-time operations. Provides guidance for secure cryptographic implementations in blockchain applications.
How do I install it?
Run `npx skills add a5c-ai/babysitter --skill crypto-primitives --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From a5c-ai/babysitter, a repository with 1,642 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.