# info > EVP_CIPHER-SEED

---
type: CommandReference
command: EVP_CIPHER-SEED
mode: man
section: 7SSL
source: man-pages
---

## Quick Reference

- `SEED-CBC` or `SEED` — SEED cipher in CBC mode
- `SEED-ECB` — SEED cipher in ECB mode
- `SEED-OFB` or `SEED-OFB128` — SEED cipher in OFB mode
- `SEED-CFB` or `SEED-CFB128` — SEED cipher in CFB mode

## Name

The SEED EVP_CIPHER implementations

## Synopsis

SEED symmetric encryption via EVP_CIPHER API. Available only in the legacy provider.

EVP_CIPHER_fetch(NULL, "SEED-CBC", NULL)
EVP_CIPHER_fetch(NULL, "SEED-ECB", NULL)
EVP_CIPHER_fetch(NULL, "SEED-OFB", NULL)
EVP_CIPHER_fetch(NULL, "SEED-CFB", NULL)
## Options

### Algorithm names (legacy provider)

- `SEED-CBC` or `SEED` — SEED in CBC mode
- `SEED-ECB` — SEED in ECB mode
- `SEED-OFB` or `SEED-OFB128` — SEED in OFB mode (128-bit feedback)
- `SEED-CFB` or `SEED-CFB128` — SEED in CFB mode (128-bit feedback)

### Parameters

This implementation supports the parameters described in `EVP_EncryptInit(3)`, section "PARAMETERS".

## See Also

- [provider-cipher(7)](http://localhost/phpMan.php/man/provider-cipher/7/markdown)
- [OSSL_PROVIDER-legacy(7)](http://localhost/phpMan.php/man/OSSLPROVIDER-legacy/7/markdown)
- [EVP_EncryptInit(3)](http://localhost/phpMan.php/man/EVPEncryptInit/3/markdown)