/* SPDX-License-Identifier: GPL-2.0 OR MIT *//* * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */ #ifndef _CRYPTO_BLAKE2S_H#define _CRYPTO_BLAKE2S_H #include <linux/bug.h>#include <linux/kconfig.h>#include <linux/types.h>#include <linux/string.h> enum blake2s_lengths {	BLAKE2S_BLOCK_SIZE = 64,	BLAKE2S_HASH_SIZE = 32,	BLAKE2S_KEY_SIZE = 32, 	BLAKE2S_128_HASH_SIZE = 16,	BLAKE2S_160_HASH_SIZE = 20,	BLAKE2S_224_HASH_SIZE = 28,	BLAKE2S_256_HASH_SIZE = 32,}; /** * struct blake2s_ctx - Context for hashing a message with BLAKE2s * @h: compression function state * @t: block counter * @f: finalization indicator * @buf: partial block buffer; 'buflen' bytes are valid * @buflen: number of bytes buffered in @buf * @outlen: length of output hash value in bytes, at most BLAKE2S_HASH_SIZE */struct blake2s_ctx {	/* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */	u32 h[8];	u32 t[2];	u32 f[2];	u8 buf[BLAKE2S_BLOCK_SIZE];	unsigned int buflen;	unsigned int outlen;}; enum blake2s_iv {	BLAKE2S_IV0 = 0x6A09E667UL,	BLAKE2S_IV1 = 0xBB67AE85UL,	BLAKE2S_IV2 = 0x3C6EF372UL,	BLAKE2S_IV3 = 0xA54FF53AUL,	BLAKE2S_IV4 = 0x510E527FUL,	BLAKE2S_IV5 = 0x9B05688CUL,	BLAKE2S_IV6 = 0x1F83D9ABUL,	BLAKE2S_IV7 = 0x5BE0CD19UL,}; static inline void __blake2s_init(struct blake2s_ctx *ctx, size_t outlen,				  const void *key, size_t keylen){	ctx->h[0] = BLAKE2S_IV0 ^ (0x01010000 | keylen << 8 | outlen);	ctx->h[1] = BLAKE2S_IV1;	ctx->h[2] = BLAKE2S_IV2;	ctx->h[3] = BLAKE2S_IV3;	ctx->h[4] = BLAKE2S_IV4;	ctx->h[5] = BLAKE2S_IV5;	ctx->h[6] = BLAKE2S_IV6;	ctx->h[7] = BLAKE2S_IV7;	ctx->t[0] = 0;	ctx->t[1] = 0;	ctx->f[0] = 0;	ctx->f[1] = 0;	ctx->buflen = 0;	ctx->outlen = outlen;	if (keylen) {		memcpy(ctx->buf, key, keylen);		memset(&ctx->buf[keylen], 0, BLAKE2S_BLOCK_SIZE - keylen);		ctx->buflen = BLAKE2S_BLOCK_SIZE;	}} /** * blake2s_init() - Initialize a BLAKE2s context for a new message (unkeyed) * @ctx: the context to initialize * @outlen: length of output hash value in bytes, at most BLAKE2S_HASH_SIZE * * Context: Any context. */static inline void blake2s_init(struct blake2s_ctx *ctx, size_t outlen){	__blake2s_init(ctx, outlen, NULL, 0);} /** * blake2s_init_key() - Initialize a BLAKE2s context for a new message (keyed) * @ctx: the context to initialize * @outlen: length of output hash value in bytes, at most BLAKE2S_HASH_SIZE * @key: the key * @keylen: the key length in bytes, at most BLAKE2S_KEY_SIZE * * Context: Any context. */static inline void blake2s_init_key(struct blake2s_ctx *ctx, size_t outlen,				    const void *key, size_t keylen){	WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||		!key || !keylen || keylen > BLAKE2S_KEY_SIZE)); 	__blake2s_init(ctx, outlen, key, keylen);} /** * blake2s_update() - Update a BLAKE2s context with message data * @ctx: the context to update; must have been initialized * @in: the message data * @inlen: the data length in bytes * * This can be called any number of times. * * Context: Any context. */void blake2s_update(struct blake2s_ctx *ctx, const u8 *in, size_t inlen); /** * blake2s_final() - Finish computing a BLAKE2s hash * @ctx: the context to finalize; must have been initialized * @out: (output) the resulting BLAKE2s hash.  Its length will be equal to the *	 @outlen that was passed to blake2s_init() or blake2s_init_key(). * * After finishing, this zeroizes @ctx.  So the caller does not need to do it. * * Context: Any context. */void blake2s_final(struct blake2s_ctx *ctx, u8 *out); /** * blake2s() - Compute BLAKE2s hash in one shot * @key: the key, or NULL for an unkeyed hash * @keylen: the key length in bytes (at most BLAKE2S_KEY_SIZE), or 0 for an *	    unkeyed hash * @in: the message data * @inlen: the data length in bytes * @out: (output) the resulting BLAKE2s hash, with length @outlen * @outlen: length of output hash value in bytes, at most BLAKE2S_HASH_SIZE * * Context: Any context. */static inline void blake2s(const u8 *key, size_t keylen,			   const u8 *in, size_t inlen,			   u8 *out, size_t outlen){	struct blake2s_ctx ctx; 	WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||		outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||		(!key && keylen))); 	__blake2s_init(&ctx, outlen, key, keylen);	blake2s_update(&ctx, in, inlen);	blake2s_final(&ctx, out);} #endif /* _CRYPTO_BLAKE2S_H */