diff options
Diffstat (limited to 'arch/s390/crypto/chacha-glue.c')
| -rw-r--r-- | arch/s390/crypto/chacha-glue.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/arch/s390/crypto/chacha-glue.c b/arch/s390/crypto/chacha-glue.c index ccfff73e2c93..2ec51f339cec 100644 --- a/arch/s390/crypto/chacha-glue.c +++ b/arch/s390/crypto/chacha-glue.c @@ -62,6 +62,34 @@ static int chacha20_s390(struct skcipher_request *req) return rc; } +void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds) +{ + /* TODO: implement hchacha_block_arch() in assembly */ + hchacha_block_generic(state, stream, nrounds); +} +EXPORT_SYMBOL(hchacha_block_arch); + +void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv) +{ + chacha_init_generic(state, key, iv); +} +EXPORT_SYMBOL(chacha_init_arch); + +void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, + unsigned int bytes, int nrounds) +{ + /* s390 chacha20 implementation has 20 rounds hard-coded, + * it cannot handle a block of data or less, but otherwise + * it can handle data of arbitrary size + */ + if (bytes <= CHACHA_BLOCK_SIZE || nrounds != 20) + chacha_crypt_generic(state, dst, src, bytes, nrounds); + else + chacha20_crypt_s390(state, dst, src, bytes, + &state[4], &state[12]); +} +EXPORT_SYMBOL(chacha_crypt_arch); + static struct skcipher_alg chacha_algs[] = { { .base.cra_name = "chacha20", @@ -83,12 +111,14 @@ static struct skcipher_alg chacha_algs[] = { static int __init chacha_mod_init(void) { - return crypto_register_skciphers(chacha_algs, ARRAY_SIZE(chacha_algs)); + return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ? + crypto_register_skciphers(chacha_algs, ARRAY_SIZE(chacha_algs)) : 0; } static void __exit chacha_mod_fini(void) { - crypto_unregister_skciphers(chacha_algs, ARRAY_SIZE(chacha_algs)); + if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER)) + crypto_unregister_skciphers(chacha_algs, ARRAY_SIZE(chacha_algs)); } module_cpu_feature_match(VXRS, chacha_mod_init); |