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-rw-r--r--linux/crypto/poly1305_generic.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/linux/crypto/poly1305_generic.c b/linux/crypto/poly1305_generic.c
new file mode 100644
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+++ b/linux/crypto/poly1305_generic.c
@@ -0,0 +1,76 @@
+/*
+ * 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/internal/hash.h>
+#include <crypto/poly1305.h>
+
+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 = shash_desc_ctx(desc);
+
+ state->key_done = false;
+ return 0;
+}
+
+static int poly1305_update(struct shash_desc *desc,
+ const u8 *src, unsigned len)
+{
+ struct poly1305_desc_ctx *state = shash_desc_ctx(desc);
+
+ 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 = shash_desc_ctx(desc);
+
+ return crypto_onetimeauth_poly1305_final(&state->s, out);
+}
+
+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",
+ .cra_flags = CRYPTO_ALG_TYPE_SHASH,
+ },
+};
+
+__attribute__((constructor(110)))
+static int poly1305_mod_init(void)
+{
+ return crypto_register_shash(&poly1305_alg);
+}