diff options
Diffstat (limited to 'c_src/linux/crypto/poly1305_generic.c')
-rw-r--r-- | c_src/linux/crypto/poly1305_generic.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/c_src/linux/crypto/poly1305_generic.c b/c_src/linux/crypto/poly1305_generic.c new file mode 100644 index 00000000..acb554c0 --- /dev/null +++ b/c_src/linux/crypto/poly1305_generic.c @@ -0,0 +1,88 @@ +/* + * Poly1305 authenticator algorithm, RFC7539 + * + * Copyright (C) 2015 Martin Willi + * + * Based on public domain code by Andrew Moon and Daniel J. Bernstein. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/byteorder.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <asm/unaligned.h> + +#include <linux/crypto.h> +#include <crypto/algapi.h> +#include <crypto/hash.h> +#include <crypto/poly1305.h> + +static struct shash_alg poly1305_alg; + +struct poly1305_desc_ctx { + bool key_done; + crypto_onetimeauth_poly1305_state s; +}; + +static int poly1305_init(struct shash_desc *desc) +{ + struct poly1305_desc_ctx *state = (void *) desc->ctx; + + state->key_done = false; + return 0; +} + +static int poly1305_update(struct shash_desc *desc, + const u8 *src, unsigned len) +{ + struct poly1305_desc_ctx *state = (void *) desc->ctx; + + if (!state->key_done) { + BUG_ON(len != crypto_onetimeauth_poly1305_KEYBYTES); + + state->key_done = true; + return crypto_onetimeauth_poly1305_init(&state->s, src); + } + + return crypto_onetimeauth_poly1305_update(&state->s, src, len); +} + +static int poly1305_final(struct shash_desc *desc, u8 *out) +{ + struct poly1305_desc_ctx *state = (void *) desc->ctx; + + return crypto_onetimeauth_poly1305_final(&state->s, out); +} + +static void *poly1305_alloc_tfm(void) +{ + struct crypto_shash *tfm = kzalloc(sizeof(*tfm), GFP_KERNEL); + + if (!tfm) + return NULL; + + tfm->base.alg = &poly1305_alg.base; + tfm->descsize = sizeof(struct poly1305_desc_ctx); + return tfm; +} + +static struct shash_alg poly1305_alg = { + .digestsize = crypto_onetimeauth_poly1305_BYTES, + .init = poly1305_init, + .update = poly1305_update, + .final = poly1305_final, + .descsize = sizeof(struct poly1305_desc_ctx), + + .base.cra_name = "poly1305", + .base.alloc_tfm = poly1305_alloc_tfm, +}; + +__attribute__((constructor(110))) +static int poly1305_mod_init(void) +{ + return crypto_register_shash(&poly1305_alg); +} |