crypto: poly1305 - Export common Poly1305 helpers
As architecture specific drivers need a software fallback, export Poly1305
init/update/final functions together with some helpers in a header file.
Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/crypto/poly1305.h b/include/crypto/poly1305.h
new file mode 100644
index 0000000..894df59
--- /dev/null
+++ b/include/crypto/poly1305.h
@@ -0,0 +1,41 @@
+/*
+ * Common values for the Poly1305 algorithm
+ */
+
+#ifndef _CRYPTO_POLY1305_H
+#define _CRYPTO_POLY1305_H
+
+#include <linux/types.h>
+#include <linux/crypto.h>
+
+#define POLY1305_BLOCK_SIZE 16
+#define POLY1305_KEY_SIZE 32
+#define POLY1305_DIGEST_SIZE 16
+
+struct poly1305_desc_ctx {
+ /* key */
+ u32 r[5];
+ /* finalize key */
+ u32 s[4];
+ /* accumulator */
+ u32 h[5];
+ /* partial buffer */
+ u8 buf[POLY1305_BLOCK_SIZE];
+ /* bytes used in partial buffer */
+ unsigned int buflen;
+ /* r key has been set */
+ bool rset;
+ /* s key has been set */
+ bool sset;
+};
+
+int crypto_poly1305_init(struct shash_desc *desc);
+int crypto_poly1305_setkey(struct crypto_shash *tfm,
+ const u8 *key, unsigned int keylen);
+unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
+ const u8 *src, unsigned int srclen);
+int crypto_poly1305_update(struct shash_desc *desc,
+ const u8 *src, unsigned int srclen);
+int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);
+
+#endif