feat(passkey-crypto): add @bitgo/passkey-crypto package - #8596
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Pure cryptographic primitives for WebAuthn PRF-based key derivation: - derivePassword: converts ArrayBuffer PRF result to hex walletPassphrase - deriveEnterpriseSalt: HMAC-SHA256 via SJCL matching retail implementation exactly TICKET: WCN-186
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Summary
modules/passkey-crypto/package (@bitgo/passkey-crypto) as the cryptographic foundation for the passkey feature (Ticket 1 of 9)derivePassword(prfResult: ArrayBuffer): string— converts WebAuthn PRF output to a hexwalletPassphrasefor SJCL encryptionderiveEnterpriseSalt(baseSalt: string, enterpriseId: string): string— HMAC-SHA256 enterprise-scoped salt to prevent cross-enterprise key reuseTest plan
yarn unit-testinmodules/passkey-crypto/— 11 tests passing (known vectors for both functions)anytypesyarn buildin the module