From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- include/crypto/sha256_base.h | 113 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 include/crypto/sha256_base.h (limited to 'include/crypto/sha256_base.h') diff --git a/include/crypto/sha256_base.h b/include/crypto/sha256_base.h new file mode 100644 index 000000000..76173c613 --- /dev/null +++ b/include/crypto/sha256_base.h @@ -0,0 +1,113 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * sha256_base.h - core logic for SHA-256 implementations + * + * Copyright (C) 2015 Linaro Ltd + */ + +#ifndef _CRYPTO_SHA256_BASE_H +#define _CRYPTO_SHA256_BASE_H + +#include +#include +#include +#include +#include + +#include + +typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src, + int blocks); + +static inline int sha224_base_init(struct shash_desc *desc) +{ + struct sha256_state *sctx = shash_desc_ctx(desc); + + sha224_init(sctx); + return 0; +} + +static inline int sha256_base_init(struct shash_desc *desc) +{ + struct sha256_state *sctx = shash_desc_ctx(desc); + + sha256_init(sctx); + return 0; +} + +static inline int sha256_base_do_update(struct shash_desc *desc, + const u8 *data, + unsigned int len, + sha256_block_fn *block_fn) +{ + struct sha256_state *sctx = shash_desc_ctx(desc); + unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; + + sctx->count += len; + + if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) { + int blocks; + + if (partial) { + int p = SHA256_BLOCK_SIZE - partial; + + memcpy(sctx->buf + partial, data, p); + data += p; + len -= p; + + block_fn(sctx, sctx->buf, 1); + } + + blocks = len / SHA256_BLOCK_SIZE; + len %= SHA256_BLOCK_SIZE; + + if (blocks) { + block_fn(sctx, data, blocks); + data += blocks * SHA256_BLOCK_SIZE; + } + partial = 0; + } + if (len) + memcpy(sctx->buf + partial, data, len); + + return 0; +} + +static inline int sha256_base_do_finalize(struct shash_desc *desc, + sha256_block_fn *block_fn) +{ + const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64); + struct sha256_state *sctx = shash_desc_ctx(desc); + __be64 *bits = (__be64 *)(sctx->buf + bit_offset); + unsigned int partial = sctx->count % SHA256_BLOCK_SIZE; + + sctx->buf[partial++] = 0x80; + if (partial > bit_offset) { + memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial); + partial = 0; + + block_fn(sctx, sctx->buf, 1); + } + + memset(sctx->buf + partial, 0x0, bit_offset - partial); + *bits = cpu_to_be64(sctx->count << 3); + block_fn(sctx, sctx->buf, 1); + + return 0; +} + +static inline int sha256_base_finish(struct shash_desc *desc, u8 *out) +{ + unsigned int digest_size = crypto_shash_digestsize(desc->tfm); + struct sha256_state *sctx = shash_desc_ctx(desc); + __be32 *digest = (__be32 *)out; + int i; + + for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32)) + put_unaligned_be32(sctx->state[i], digest++); + + memzero_explicit(sctx, sizeof(*sctx)); + return 0; +} + +#endif /* _CRYPTO_SHA256_BASE_H */ -- cgit v1.2.3