1 files changed, 101 insertions, 0 deletions
diff --git a/include/crypto/internal/blake2b.h b/include/crypto/internal/blake2b.h
new file mode 100644
index 000000000000..3e09e2485306
--- /dev/null
+++ b/include/crypto/internal/blake2b.h
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/*
+ * Helper functions for BLAKE2b implementations.
+ * Keep this in sync with the corresponding BLAKE2s header.
+ */
+
+#ifndef _CRYPTO_INTERNAL_BLAKE2B_H
+#define _CRYPTO_INTERNAL_BLAKE2B_H
+
+#include <asm/byteorder.h>
+#include <crypto/blake2b.h>
+#include <crypto/internal/hash.h>
+#include <linux/array_size.h>
+#include <linux/compiler.h>
+#include <linux/build_bug.h>
+#include <linux/errno.h>
+#include <linux/math.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+static inline void blake2b_set_lastblock(struct blake2b_state *state)
+{
+	state->f[0] = -1;
+	state->f[1] = 0;
+}
+
+static inline void blake2b_set_nonlast(struct blake2b_state *state)
+{
+	state->f[0] = 0;
+	state->f[1] = 0;
+}
+
+typedef void (*blake2b_compress_t)(struct blake2b_state *state,
+				   const u8 *block, size_t nblocks, u32 inc);
+
+/* Helper functions for shash implementations of BLAKE2b */
+
+struct blake2b_tfm_ctx {
+	u8 key[BLAKE2B_BLOCK_SIZE];
+	unsigned int keylen;
+};
+
+static inline int crypto_blake2b_setkey(struct crypto_shash *tfm,
+					const u8 *key, unsigned int keylen)
+{
+	struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(tfm);
+
+	if (keylen > BLAKE2B_KEY_SIZE)
+		return -EINVAL;
+
+	BUILD_BUG_ON(BLAKE2B_KEY_SIZE > BLAKE2B_BLOCK_SIZE);
+
+	memcpy(tctx->key, key, keylen);
+	memset(tctx->key + keylen, 0, BLAKE2B_BLOCK_SIZE - keylen);
+	tctx->keylen = keylen;
+
+	return 0;
+}
+
+static inline int crypto_blake2b_init(struct shash_desc *desc)
+{
+	const struct blake2b_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
+	struct blake2b_state *state = shash_desc_ctx(desc);
+	unsigned int outlen = crypto_shash_digestsize(desc->tfm);
+
+	__blake2b_init(state, outlen, tctx->keylen);
+	return tctx->keylen ?
+	       crypto_shash_update(desc, tctx->key, BLAKE2B_BLOCK_SIZE) : 0;
+}
+
+static inline int crypto_blake2b_update_bo(struct shash_desc *desc,
+					   const u8 *in, unsigned int inlen,
+					   blake2b_compress_t compress)
+{
+	struct blake2b_state *state = shash_desc_ctx(desc);
+
+	blake2b_set_nonlast(state);
+	compress(state, in, inlen / BLAKE2B_BLOCK_SIZE, BLAKE2B_BLOCK_SIZE);
+	return inlen - round_down(inlen, BLAKE2B_BLOCK_SIZE);
+}
+
+static inline int crypto_blake2b_finup(struct shash_desc *desc, const u8 *in,
+				       unsigned int inlen, u8 *out,
+				       blake2b_compress_t compress)
+{
+	struct blake2b_state *state = shash_desc_ctx(desc);
+	u8 buf[BLAKE2B_BLOCK_SIZE];
+	int i;
+
+	memcpy(buf, in, inlen);
+	memset(buf + inlen, 0, BLAKE2B_BLOCK_SIZE - inlen);
+	blake2b_set_lastblock(state);
+	compress(state, buf, 1, inlen);
+	for (i = 0; i < ARRAY_SIZE(state->h); i++)
+		__cpu_to_le64s(&state->h[i]);
+	memcpy(out, state->h, crypto_shash_digestsize(desc->tfm));
+	memzero_explicit(buf, sizeof(buf));
+	return 0;
+}
+
+#endif /* _CRYPTO_INTERNAL_BLAKE2B_H */