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authorMartin Willi <martin@strongswan.org>2015-07-16 19:14:00 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2015-07-17 21:20:21 +0800
commit31d7247da57226e847f0f102a10c27c0722c429b (patch)
tree3ca25c75fc443d974213e845d5999fd41b578091 /include/crypto/chacha20.h
parentcrypto: tcrypt - Add ChaCha20/Poly1305 speed tests (diff)
downloadlinux-dev-31d7247da57226e847f0f102a10c27c0722c429b.tar.xz
linux-dev-31d7247da57226e847f0f102a10c27c0722c429b.zip
crypto: chacha20 - Export common ChaCha20 helpers
As architecture specific drivers need a software fallback, export a ChaCha20 en-/decryption function 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>
Diffstat (limited to 'include/crypto/chacha20.h')
-rw-r--r--include/crypto/chacha20.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/crypto/chacha20.h b/include/crypto/chacha20.h
new file mode 100644
index 000000000000..274bbaeeed0f
--- /dev/null
+++ b/include/crypto/chacha20.h
@@ -0,0 +1,25 @@
+/*
+ * Common values for the ChaCha20 algorithm
+ */
+
+#ifndef _CRYPTO_CHACHA20_H
+#define _CRYPTO_CHACHA20_H
+
+#include <linux/types.h>
+#include <linux/crypto.h>
+
+#define CHACHA20_IV_SIZE 16
+#define CHACHA20_KEY_SIZE 32
+#define CHACHA20_BLOCK_SIZE 64
+
+struct chacha20_ctx {
+ u32 key[8];
+};
+
+void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv);
+int crypto_chacha20_setkey(struct crypto_tfm *tfm, const u8 *key,
+ unsigned int keysize);
+int crypto_chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
+ struct scatterlist *src, unsigned int nbytes);
+
+#endif