2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
4 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <crypto/internal/hash.h>
12 #include <crypto/sha.h>
13 #include <linux/crypto.h>
14 #include <linux/module.h>
16 #include <asm/hwcap.h>
19 #include <asm/unaligned.h>
21 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
22 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
23 MODULE_LICENSE("GPL v2");
25 asmlinkage void sha2_ce_transform(int blocks, u8 const *src, u32 *state,
28 static int sha224_init(struct shash_desc *desc)
30 struct sha256_state *sctx = shash_desc_ctx(desc);
32 *sctx = (struct sha256_state){
34 SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
35 SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
41 static int sha256_init(struct shash_desc *desc)
43 struct sha256_state *sctx = shash_desc_ctx(desc);
45 *sctx = (struct sha256_state){
47 SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
48 SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
54 static int sha2_update(struct shash_desc *desc, const u8 *data,
57 struct sha256_state *sctx = shash_desc_ctx(desc);
61 return crypto_sha256_update(desc, data, len);
63 partial = sctx->count % SHA256_BLOCK_SIZE;
66 if ((partial + len) >= SHA256_BLOCK_SIZE) {
70 int p = SHA256_BLOCK_SIZE - partial;
72 memcpy(sctx->buf + partial, data, p);
77 blocks = len / SHA256_BLOCK_SIZE;
78 len %= SHA256_BLOCK_SIZE;
81 sha2_ce_transform(blocks, data, sctx->state,
82 partial ? sctx->buf : NULL);
85 data += blocks * SHA256_BLOCK_SIZE;
89 memcpy(sctx->buf + partial, data, len);
93 static void sha2_final(struct shash_desc *desc)
95 static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
97 struct sha256_state *sctx = shash_desc_ctx(desc);
98 __be64 bits = cpu_to_be64(sctx->count << 3);
99 u32 padlen = SHA256_BLOCK_SIZE
100 - ((sctx->count + sizeof(bits)) % SHA256_BLOCK_SIZE);
102 sha2_update(desc, padding, padlen);
103 sha2_update(desc, (const u8 *)&bits, sizeof(bits));
106 static int sha224_final(struct shash_desc *desc, u8 *out)
108 struct sha256_state *sctx = shash_desc_ctx(desc);
109 __be32 *dst = (__be32 *)out;
114 for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
115 put_unaligned_be32(sctx->state[i], dst++);
117 *sctx = (struct sha256_state){};
121 static int sha256_final(struct shash_desc *desc, u8 *out)
123 struct sha256_state *sctx = shash_desc_ctx(desc);
124 __be32 *dst = (__be32 *)out;
129 for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
130 put_unaligned_be32(sctx->state[i], dst++);
132 *sctx = (struct sha256_state){};
136 static int sha2_export(struct shash_desc *desc, void *out)
138 struct sha256_state *sctx = shash_desc_ctx(desc);
139 struct sha256_state *dst = out;
145 static int sha2_import(struct shash_desc *desc, const void *in)
147 struct sha256_state *sctx = shash_desc_ctx(desc);
148 struct sha256_state const *src = in;
154 static struct shash_alg algs[] = { {
156 .update = sha2_update,
157 .final = sha224_final,
158 .export = sha2_export,
159 .import = sha2_import,
160 .descsize = sizeof(struct sha256_state),
161 .digestsize = SHA224_DIGEST_SIZE,
162 .statesize = sizeof(struct sha256_state),
164 .cra_name = "sha224",
165 .cra_driver_name = "sha224-ce",
167 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
168 .cra_blocksize = SHA256_BLOCK_SIZE,
169 .cra_module = THIS_MODULE,
173 .update = sha2_update,
174 .final = sha256_final,
175 .export = sha2_export,
176 .import = sha2_import,
177 .descsize = sizeof(struct sha256_state),
178 .digestsize = SHA256_DIGEST_SIZE,
179 .statesize = sizeof(struct sha256_state),
181 .cra_name = "sha256",
182 .cra_driver_name = "sha256-ce",
184 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
185 .cra_blocksize = SHA256_BLOCK_SIZE,
186 .cra_module = THIS_MODULE,
190 static int __init sha2_ce_mod_init(void)
192 if (!(elf_hwcap2 & HWCAP2_SHA2))
194 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
197 static void __exit sha2_ce_mod_fini(void)
199 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
202 module_init(sha2_ce_mod_init);
203 module_exit(sha2_ce_mod_fini);