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crypto: chacha20poly1305 - Add an IPsec variant for RFC7539 AEAD

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draft-ietf-ipsecme-chacha20-poly1305 defines the use of ChaCha20/Poly1305 in
ESP. It uses additional four byte key material as a salt, which is then used
with an 8 byte IV to form the ChaCha20 nonce as defined in the RFC7539.

Signed-off-by: Martin Willi <martin@strongswan.org>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Martin Willi 2015-06-01 13:44:02 +02:00 committed by Herbert Xu
parent af2b76b53a
commit 4db4ad2609
1 changed files with 25 additions and 1 deletions
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26
crypto/chacha20poly1305.c
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@ -627,6 +627,11 @@ static struct crypto_instance *rfc7539_alloc(struct rtattr **tb)
return chachapoly_alloc(tb, "rfc7539", 12);
}
static struct crypto_instance *rfc7539esp_alloc(struct rtattr **tb)
{
return chachapoly_alloc(tb, "rfc7539esp", 8);
}
static void chachapoly_free(struct crypto_instance *inst)
{
struct chachapoly_instance_ctx *ctx = crypto_instance_ctx(inst);
@ -643,13 +648,31 @@ static struct crypto_template rfc7539_tmpl = {
.module = THIS_MODULE,
};
static struct crypto_template rfc7539esp_tmpl = {
.name = "rfc7539esp",
.alloc = rfc7539esp_alloc,
.free = chachapoly_free,
.module = THIS_MODULE,
};
static int __init chacha20poly1305_module_init(void)
{
return crypto_register_template(&rfc7539_tmpl);
int err;
err = crypto_register_template(&rfc7539_tmpl);
if (err)
return err;
err = crypto_register_template(&rfc7539esp_tmpl);
if (err)
crypto_unregister_template(&rfc7539_tmpl);
return err;
}
static void __exit chacha20poly1305_module_exit(void)
{
crypto_unregister_template(&rfc7539esp_tmpl);
crypto_unregister_template(&rfc7539_tmpl);
}
@ -661,3 +684,4 @@ MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD");
MODULE_ALIAS_CRYPTO("chacha20poly1305");
MODULE_ALIAS_CRYPTO("rfc7539");
MODULE_ALIAS_CRYPTO("rfc7539esp");