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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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2aaba014b5
<linux/cryptohash.h> sounds very generic and important, like it's the header to include if you're doing cryptographic hashing in the kernel. But actually it only includes the library implementation of the SHA-1 compression function (not even the full SHA-1). This should basically never be used anymore; SHA-1 is no longer considered secure, and there are much better ways to do cryptographic hashing in the kernel. Most files that include this header don't actually need it. So in preparation for removing it, remove all these unneeded includes of it. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
158 lines
3.5 KiB
C
158 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Glue code for MD5 implementation for PPC assembler
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*
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* Based on generic implementation.
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*
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* Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
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*/
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#include <crypto/internal/hash.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/types.h>
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#include <crypto/md5.h>
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#include <asm/byteorder.h>
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extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks);
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static inline void ppc_md5_clear_context(struct md5_state *sctx)
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{
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int count = sizeof(struct md5_state) >> 2;
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u32 *ptr = (u32 *)sctx;
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/* make sure we can clear the fast way */
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BUILD_BUG_ON(sizeof(struct md5_state) % 4);
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do { *ptr++ = 0; } while (--count);
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}
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static int ppc_md5_init(struct shash_desc *desc)
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{
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struct md5_state *sctx = shash_desc_ctx(desc);
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sctx->hash[0] = MD5_H0;
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sctx->hash[1] = MD5_H1;
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sctx->hash[2] = MD5_H2;
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sctx->hash[3] = MD5_H3;
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sctx->byte_count = 0;
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return 0;
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}
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static int ppc_md5_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct md5_state *sctx = shash_desc_ctx(desc);
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const unsigned int offset = sctx->byte_count & 0x3f;
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unsigned int avail = 64 - offset;
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const u8 *src = data;
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sctx->byte_count += len;
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if (avail > len) {
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memcpy((char *)sctx->block + offset, src, len);
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return 0;
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}
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if (offset) {
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memcpy((char *)sctx->block + offset, src, avail);
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ppc_md5_transform(sctx->hash, (const u8 *)sctx->block, 1);
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len -= avail;
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src += avail;
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}
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if (len > 63) {
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ppc_md5_transform(sctx->hash, src, len >> 6);
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src += len & ~0x3f;
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len &= 0x3f;
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}
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memcpy((char *)sctx->block, src, len);
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return 0;
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}
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static int ppc_md5_final(struct shash_desc *desc, u8 *out)
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{
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struct md5_state *sctx = shash_desc_ctx(desc);
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const unsigned int offset = sctx->byte_count & 0x3f;
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const u8 *src = (const u8 *)sctx->block;
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u8 *p = (u8 *)src + offset;
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int padlen = 55 - offset;
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__le64 *pbits = (__le64 *)((char *)sctx->block + 56);
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__le32 *dst = (__le32 *)out;
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*p++ = 0x80;
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if (padlen < 0) {
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memset(p, 0x00, padlen + sizeof (u64));
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ppc_md5_transform(sctx->hash, src, 1);
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p = (char *)sctx->block;
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padlen = 56;
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}
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memset(p, 0, padlen);
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*pbits = cpu_to_le64(sctx->byte_count << 3);
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ppc_md5_transform(sctx->hash, src, 1);
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dst[0] = cpu_to_le32(sctx->hash[0]);
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dst[1] = cpu_to_le32(sctx->hash[1]);
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dst[2] = cpu_to_le32(sctx->hash[2]);
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dst[3] = cpu_to_le32(sctx->hash[3]);
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ppc_md5_clear_context(sctx);
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return 0;
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}
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static int ppc_md5_export(struct shash_desc *desc, void *out)
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{
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struct md5_state *sctx = shash_desc_ctx(desc);
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memcpy(out, sctx, sizeof(*sctx));
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return 0;
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}
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static int ppc_md5_import(struct shash_desc *desc, const void *in)
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{
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struct md5_state *sctx = shash_desc_ctx(desc);
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memcpy(sctx, in, sizeof(*sctx));
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return 0;
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}
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static struct shash_alg alg = {
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.digestsize = MD5_DIGEST_SIZE,
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.init = ppc_md5_init,
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.update = ppc_md5_update,
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.final = ppc_md5_final,
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.export = ppc_md5_export,
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.import = ppc_md5_import,
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.descsize = sizeof(struct md5_state),
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.statesize = sizeof(struct md5_state),
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.base = {
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.cra_name = "md5",
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.cra_driver_name= "md5-ppc",
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.cra_priority = 200,
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.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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static int __init ppc_md5_mod_init(void)
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{
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return crypto_register_shash(&alg);
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}
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static void __exit ppc_md5_mod_fini(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(ppc_md5_mod_init);
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module_exit(ppc_md5_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, PPC assembler");
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MODULE_ALIAS_CRYPTO("md5");
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MODULE_ALIAS_CRYPTO("md5-ppc");
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