1 /*
2  * SHA-384 hash implementation and interface functions
3  * Copyright (c) 2015, Pali Rohár <pali.rohar@gmail.com>
4  *
5  * This software may be distributed under the terms of the BSD license.
6  * See README for more details.
7  */
8 
9 #include "includes.h"
10 
11 #include "common.h"
12 #include "sha384_i.h"
13 #include "crypto.h"
14 
15 
16 /**
17  * sha384_vector - SHA384 hash for data vector
18  * @num_elem: Number of elements in the data vector
19  * @addr: Pointers to the data areas
20  * @len: Lengths of the data blocks
21  * @mac: Buffer for the hash
22  * Returns: 0 on success, -1 of failure
23  */
sha384_vector(size_t num_elem,const u8 * addr[],const size_t * len,u8 * mac)24 int sha384_vector(size_t num_elem, const u8 *addr[], const size_t *len,
25 		  u8 *mac)
26 {
27 	struct sha384_state ctx;
28 	size_t i;
29 
30 	sha384_init(&ctx);
31 	for (i = 0; i < num_elem; i++)
32 		if (sha384_process(&ctx, addr[i], len[i]))
33 			return -1;
34 	if (sha384_done(&ctx, mac))
35 		return -1;
36 	return 0;
37 }
38 
39 
40 /* ===== start - public domain SHA384 implementation ===== */
41 
42 /* This is based on SHA384 implementation in LibTomCrypt that was released into
43  * public domain by Tom St Denis. */
44 
45 #define CONST64(n) n ## ULL
46 
47 /**
48    Initialize the hash state
49    @param md   The hash state you wish to initialize
50    @return CRYPT_OK if successful
51 */
sha384_init(struct sha384_state * md)52 void sha384_init(struct sha384_state *md)
53 {
54 	md->curlen = 0;
55 	md->length = 0;
56 	md->state[0] = CONST64(0xcbbb9d5dc1059ed8);
57 	md->state[1] = CONST64(0x629a292a367cd507);
58 	md->state[2] = CONST64(0x9159015a3070dd17);
59 	md->state[3] = CONST64(0x152fecd8f70e5939);
60 	md->state[4] = CONST64(0x67332667ffc00b31);
61 	md->state[5] = CONST64(0x8eb44a8768581511);
62 	md->state[6] = CONST64(0xdb0c2e0d64f98fa7);
63 	md->state[7] = CONST64(0x47b5481dbefa4fa4);
64 }
65 
sha384_process(struct sha384_state * md,const unsigned char * in,unsigned long inlen)66 int sha384_process(struct sha384_state *md, const unsigned char *in,
67 		   unsigned long inlen)
68 {
69 	return sha512_process(md, in, inlen);
70 }
71 
72 /**
73    Terminate the hash to get the digest
74    @param md  The hash state
75    @param out [out] The destination of the hash (48 bytes)
76    @return CRYPT_OK if successful
77 */
sha384_done(struct sha384_state * md,unsigned char * out)78 int sha384_done(struct sha384_state *md, unsigned char *out)
79 {
80 	unsigned char buf[64];
81 
82 	if (md->curlen >= sizeof(md->buf))
83 		return -1;
84 
85 	if (sha512_done(md, buf) != 0)
86 		return -1;
87 
88 	os_memcpy(out, buf, 48);
89 	return 0;
90 }
91 
92 /* ===== end - public domain SHA384 implementation ===== */
93