2 * SHA transform algorithm, originally taken from code written by
3 * Peter Gutmann, and placed in the public domain.
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/cryptohash.h>
10 /* The SHA f()-functions. */
12 #define f1(x,y,z) (z ^ (x & (y ^ z))) /* x ? y : z */
13 #define f2(x,y,z) (x ^ y ^ z) /* XOR */
14 #define f3(x,y,z) ((x & y) + (z & (x ^ y))) /* majority */
16 /* The SHA Mysterious Constants */
18 #define K1 0x5A827999L /* Rounds 0-19: sqrt(2) * 2^30 */
19 #define K2 0x6ED9EBA1L /* Rounds 20-39: sqrt(3) * 2^30 */
20 #define K3 0x8F1BBCDCL /* Rounds 40-59: sqrt(5) * 2^30 */
21 #define K4 0xCA62C1D6L /* Rounds 60-79: sqrt(10) * 2^30 */
24 * sha_transform - single block SHA1 transform
26 * @digest: 160 bit digest to update
27 * @data: 512 bits of data to hash
28 * @W: 80 words of workspace (see note)
30 * This function generates a SHA1 digest for a single 512-bit block.
31 * Be warned, it does not handle padding and message digest, do not
32 * confuse it with the full FIPS 180-1 digest algorithm for variable
35 * Note: If the hash is security sensitive, the caller should be sure
36 * to clear the workspace. This is left to the caller to avoid
37 * unnecessary clears between chained hashing operations.
39 void sha_transform(__u32 *digest, const char *in, __u32 *W)
41 __u32 a, b, c, d, e, t, i;
43 for (i = 0; i < 16; i++)
44 W[i] = be32_to_cpu(((const __be32 *)in)[i]);
46 for (i = 0; i < 64; i++)
47 W[i+16] = rol32(W[i+13] ^ W[i+8] ^ W[i+2] ^ W[i], 1);
55 for (i = 0; i < 20; i++) {
56 t = f1(b, c, d) + K1 + rol32(a, 5) + e + W[i];
57 e = d; d = c; c = rol32(b, 30); b = a; a = t;
60 for (; i < 40; i ++) {
61 t = f2(b, c, d) + K2 + rol32(a, 5) + e + W[i];
62 e = d; d = c; c = rol32(b, 30); b = a; a = t;
65 for (; i < 60; i ++) {
66 t = f3(b, c, d) + K3 + rol32(a, 5) + e + W[i];
67 e = d; d = c; c = rol32(b, 30); b = a; a = t;
70 for (; i < 80; i ++) {
71 t = f2(b, c, d) + K4 + rol32(a, 5) + e + W[i];
72 e = d; d = c; c = rol32(b, 30); b = a; a = t;
81 EXPORT_SYMBOL(sha_transform);
84 * sha_init - initialize the vectors for a SHA1 digest
85 * @buf: vector to initialize
87 void sha_init(__u32 *buf)