1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Glue code for MD5 implementation for PPC assembler
4 *
5 * Based on generic implementation.
6 *
7 * Copyright (c) 2015 Markus Stockhausen <stockhausen@collogia.de>
8 */
9
10 #include <crypto/internal/hash.h>
11 #include <crypto/md5.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/string.h>
15
16 extern void ppc_md5_transform(u32 *state, const u8 *src, u32 blocks);
17
ppc_md5_init(struct shash_desc * desc)18 static int ppc_md5_init(struct shash_desc *desc)
19 {
20 struct md5_state *sctx = shash_desc_ctx(desc);
21
22 sctx->hash[0] = MD5_H0;
23 sctx->hash[1] = MD5_H1;
24 sctx->hash[2] = MD5_H2;
25 sctx->hash[3] = MD5_H3;
26 sctx->byte_count = 0;
27
28 return 0;
29 }
30
ppc_md5_update(struct shash_desc * desc,const u8 * data,unsigned int len)31 static int ppc_md5_update(struct shash_desc *desc, const u8 *data,
32 unsigned int len)
33 {
34 struct md5_state *sctx = shash_desc_ctx(desc);
35
36 sctx->byte_count += round_down(len, MD5_HMAC_BLOCK_SIZE);
37 ppc_md5_transform(sctx->hash, data, len >> 6);
38 return len - round_down(len, MD5_HMAC_BLOCK_SIZE);
39 }
40
ppc_md5_finup(struct shash_desc * desc,const u8 * src,unsigned int offset,u8 * out)41 static int ppc_md5_finup(struct shash_desc *desc, const u8 *src,
42 unsigned int offset, u8 *out)
43 {
44 struct md5_state *sctx = shash_desc_ctx(desc);
45 __le64 block[MD5_BLOCK_WORDS] = {};
46 u8 *p = memcpy(block, src, offset);
47 __le32 *dst = (__le32 *)out;
48 __le64 *pbits;
49
50 src = p;
51 p += offset;
52 *p++ = 0x80;
53 sctx->byte_count += offset;
54 pbits = &block[(MD5_BLOCK_WORDS / (offset > 55 ? 1 : 2)) - 1];
55 *pbits = cpu_to_le64(sctx->byte_count << 3);
56 ppc_md5_transform(sctx->hash, src, (pbits - block + 1) / 8);
57 memzero_explicit(block, sizeof(block));
58
59 dst[0] = cpu_to_le32(sctx->hash[0]);
60 dst[1] = cpu_to_le32(sctx->hash[1]);
61 dst[2] = cpu_to_le32(sctx->hash[2]);
62 dst[3] = cpu_to_le32(sctx->hash[3]);
63 return 0;
64 }
65
66 static struct shash_alg alg = {
67 .digestsize = MD5_DIGEST_SIZE,
68 .init = ppc_md5_init,
69 .update = ppc_md5_update,
70 .finup = ppc_md5_finup,
71 .descsize = MD5_STATE_SIZE,
72 .base = {
73 .cra_name = "md5",
74 .cra_driver_name= "md5-ppc",
75 .cra_priority = 200,
76 .cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY,
77 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
78 .cra_module = THIS_MODULE,
79 }
80 };
81
ppc_md5_mod_init(void)82 static int __init ppc_md5_mod_init(void)
83 {
84 return crypto_register_shash(&alg);
85 }
86
ppc_md5_mod_fini(void)87 static void __exit ppc_md5_mod_fini(void)
88 {
89 crypto_unregister_shash(&alg);
90 }
91
92 module_init(ppc_md5_mod_init);
93 module_exit(ppc_md5_mod_fini);
94
95 MODULE_LICENSE("GPL");
96 MODULE_DESCRIPTION("MD5 Secure Hash Algorithm, PPC assembler");
97
98 MODULE_ALIAS_CRYPTO("md5");
99 MODULE_ALIAS_CRYPTO("md5-ppc");
100