1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/staging/skein/threefish_api.c b/drivers/staging/skein/threefish_api.c
new file mode 100644
index 000000000..2b649abb7
--- /dev/null
+++ b/drivers/staging/skein/threefish_api.c
@@ -0,0 +1,77 @@
+#include <linux/string.h>
+#include "threefish_api.h"
+
+void threefish_set_key(struct threefish_key *key_ctx,
+		       enum threefish_size state_size,
+		       u64 *key_data, u64 *tweak)
+{
+	int key_words = state_size / 64;
+	int i;
+	u64 parity = KEY_SCHEDULE_CONST;
+
+	key_ctx->tweak[0] = tweak[0];
+	key_ctx->tweak[1] = tweak[1];
+	key_ctx->tweak[2] = tweak[0] ^ tweak[1];
+
+	for (i = 0; i < key_words; i++) {
+		key_ctx->key[i] = key_data[i];
+		parity ^= key_data[i];
+	}
+	key_ctx->key[i] = parity;
+	key_ctx->state_size = state_size;
+}
+
+void threefish_encrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
+				   u8 *out)
+{
+	u64 plain[SKEIN_MAX_STATE_WORDS];        /* max number of words*/
+	u64 cipher[SKEIN_MAX_STATE_WORDS];
+
+	skein_get64_lsb_first(plain, in, key_ctx->state_size / 64);
+	threefish_encrypt_block_words(key_ctx, plain, cipher);
+	skein_put64_lsb_first(out, cipher, key_ctx->state_size / 8);
+}
+
+void threefish_encrypt_block_words(struct threefish_key *key_ctx, u64 *in,
+				   u64 *out)
+{
+	switch (key_ctx->state_size) {
+	case THREEFISH_256:
+		threefish_encrypt_256(key_ctx, in, out);
+		break;
+	case THREEFISH_512:
+		threefish_encrypt_512(key_ctx, in, out);
+		break;
+	case THREEFISH_1024:
+		threefish_encrypt_1024(key_ctx, in, out);
+		break;
+	}
+}
+
+void threefish_decrypt_block_bytes(struct threefish_key *key_ctx, u8 *in,
+				   u8 *out)
+{
+	u64 plain[SKEIN_MAX_STATE_WORDS];        /* max number of words*/
+	u64 cipher[SKEIN_MAX_STATE_WORDS];
+
+	skein_get64_lsb_first(cipher, in, key_ctx->state_size / 64);
+	threefish_decrypt_block_words(key_ctx, cipher, plain);
+	skein_put64_lsb_first(out, plain, key_ctx->state_size / 8);
+}
+
+void threefish_decrypt_block_words(struct threefish_key *key_ctx, u64 *in,
+				   u64 *out)
+{
+	switch (key_ctx->state_size) {
+	case THREEFISH_256:
+		threefish_decrypt_256(key_ctx, in, out);
+		break;
+	case THREEFISH_512:
+		threefish_decrypt_512(key_ctx, in, out);
+		break;
+	case THREEFISH_1024:
+		threefish_decrypt_1024(key_ctx, in, out);
+		break;
+	}
+}
+