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crypto: powerpc/md5 - glue
Glue code for crypto infrastructure. Call the assembler code where required. Take a little care about small input data. Kick out early for input chunks < 64 bytes and replace memset for context cleanup with simple loop. Signed-off-by: Markus Stockhausen <stockhausen@collogia.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Markus Stockhausen
Herbert Xu
parent
209232d025
commit
e90508d3b0
165
arch/powerpc/crypto/md5_glue.c
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165
arch/powerpc/crypto/md5_glue.c
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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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/cryptohash.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] = 0x67452301;
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sctx->hash[1] = 0xefcdab89;
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sctx->hash[2] = 0x98badcfe;
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sctx->hash[3] = 0x10325476;
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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_flags = CRYPTO_ALG_TYPE_SHASH,
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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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