diff options
Diffstat (limited to 'include/crypto/chacha.h')
| -rw-r--r-- | include/crypto/chacha.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/crypto/chacha.h b/include/crypto/chacha.h index b722a23e54bb..1fc70a69d550 100644 --- a/include/crypto/chacha.h +++ b/include/crypto/chacha.h @@ -5,6 +5,11 @@ * XChaCha extends ChaCha's nonce to 192 bits, while provably retaining ChaCha's * security. Here they share the same key size, tfm context, and setkey * function; only their IV size and encrypt/decrypt function differ. + * + * The ChaCha paper specifies 20, 12, and 8-round variants. In general, it is + * recommended to use the 20-round variant ChaCha20. However, the other + * variants can be needed in some performance-sensitive scenarios. The generic + * ChaCha code currently allows only the 20 and 12-round variants. */ #ifndef _CRYPTO_CHACHA_H @@ -40,6 +45,8 @@ void crypto_chacha_init(u32 *state, struct chacha_ctx *ctx, u8 *iv); int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key, unsigned int keysize); +int crypto_chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keysize); int crypto_chacha_crypt(struct skcipher_request *req); int crypto_xchacha_crypt(struct skcipher_request *req); |