| name | goyacodedevutils-yarsa |
| description | RSA utilities - deterministic key generation, flexible private-key parsing (PEM/DER/base64), and chunked RSA-OAEP encrypt/decrypt for arbitrary-length data. Use instead of hand-rolling crypto/rsa key handling. |
yarsa Skill
Import path: github.com/YaCodeDev/GoYaCodeDevUtils/yarsa.
RSA utilities: deterministic key generation (reproducible from a seed), flexible private-key parsing
(PEM/DER/base64 variants), and chunked RSA-OAEP encrypt/decrypt for arbitrary-length data.
Key API
KeyOpts struct — { Bits, Exponent, Seed []byte }.GenerateDeterministicRSAPrivateKey(opts KeyOpts) (*rsa.PrivateKey, yaerrors.Error) — the same seed + bits + exponent always yields an identical key.ParsePrivateKey(s string) (*rsa.PrivateKey, yaerrors.Error) — accepts PEM (PKCS#1/PKCS#8), base64-of-PEM, or base64-of-raw-DER.DeterministicReader struct + NewDeterministicReader(seed []byte) *DeterministicReader — HMAC-SHA256-based deterministic byte stream, an io.Reader.StripCRLF(s string) string.Encrypt(plaintext []byte, public *rsa.PublicKey) ([]byte, yaerrors.Error) — RSA-OAEP (SHA-256), auto-chunks plaintext (190 bytes/chunk for 2048-bit keys).Decrypt(ciphertext []byte, private *rsa.PrivateKey) ([]byte, yaerrors.Error) — reverses the chunking (ciphertext length must be a multiple of the key's block size).
Usage Notes
GenerateDeterministicRSAPrivateKey requires a high-entropy Seed — a weak seed fully compromises the key. Bits must be even and >= 512.DeterministicReader and GenerateDeterministicRSA* are not concurrency-safe — one instance per goroutine.Encrypt/Decrypt don't handle transport encoding (no base64) — apply that at the edges yourself (see yaginmiddleware for an example combining it with yaencoding.ToString). Depends only on yaerrors.
