72fd4a35a8
A variety of (mostly) innocuous fixes to the embedded kernel-doc content in source files, including: * make multi-line initial descriptions single line * denote some function names, constants and structs as such * change erroneous opening '/*' to '/**' in a few places * reword some text for clarity Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
|
|
* SHA transform algorithm, originally taken from code written by
|
|
* Peter Gutmann, and placed in the public domain.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/cryptohash.h>
|
|
|
|
/* The SHA f()-functions. */
|
|
|
|
#define f1(x,y,z) (z ^ (x & (y ^ z))) /* x ? y : z */
|
|
#define f2(x,y,z) (x ^ y ^ z) /* XOR */
|
|
#define f3(x,y,z) ((x & y) + (z & (x ^ y))) /* majority */
|
|
|
|
/* The SHA Mysterious Constants */
|
|
|
|
#define K1 0x5A827999L /* Rounds 0-19: sqrt(2) * 2^30 */
|
|
#define K2 0x6ED9EBA1L /* Rounds 20-39: sqrt(3) * 2^30 */
|
|
#define K3 0x8F1BBCDCL /* Rounds 40-59: sqrt(5) * 2^30 */
|
|
#define K4 0xCA62C1D6L /* Rounds 60-79: sqrt(10) * 2^30 */
|
|
|
|
/**
|
|
* sha_transform - single block SHA1 transform
|
|
*
|
|
* @digest: 160 bit digest to update
|
|
* @data: 512 bits of data to hash
|
|
* @W: 80 words of workspace (see note)
|
|
*
|
|
* This function generates a SHA1 digest for a single 512-bit block.
|
|
* Be warned, it does not handle padding and message digest, do not
|
|
* confuse it with the full FIPS 180-1 digest algorithm for variable
|
|
* length messages.
|
|
*
|
|
* Note: If the hash is security sensitive, the caller should be sure
|
|
* to clear the workspace. This is left to the caller to avoid
|
|
* unnecessary clears between chained hashing operations.
|
|
*/
|
|
void sha_transform(__u32 *digest, const char *in, __u32 *W)
|
|
{
|
|
__u32 a, b, c, d, e, t, i;
|
|
|
|
for (i = 0; i < 16; i++)
|
|
W[i] = be32_to_cpu(((const __be32 *)in)[i]);
|
|
|
|
for (i = 0; i < 64; i++)
|
|
W[i+16] = rol32(W[i+13] ^ W[i+8] ^ W[i+2] ^ W[i], 1);
|
|
|
|
a = digest[0];
|
|
b = digest[1];
|
|
c = digest[2];
|
|
d = digest[3];
|
|
e = digest[4];
|
|
|
|
for (i = 0; i < 20; i++) {
|
|
t = f1(b, c, d) + K1 + rol32(a, 5) + e + W[i];
|
|
e = d; d = c; c = rol32(b, 30); b = a; a = t;
|
|
}
|
|
|
|
for (; i < 40; i ++) {
|
|
t = f2(b, c, d) + K2 + rol32(a, 5) + e + W[i];
|
|
e = d; d = c; c = rol32(b, 30); b = a; a = t;
|
|
}
|
|
|
|
for (; i < 60; i ++) {
|
|
t = f3(b, c, d) + K3 + rol32(a, 5) + e + W[i];
|
|
e = d; d = c; c = rol32(b, 30); b = a; a = t;
|
|
}
|
|
|
|
for (; i < 80; i ++) {
|
|
t = f2(b, c, d) + K4 + rol32(a, 5) + e + W[i];
|
|
e = d; d = c; c = rol32(b, 30); b = a; a = t;
|
|
}
|
|
|
|
digest[0] += a;
|
|
digest[1] += b;
|
|
digest[2] += c;
|
|
digest[3] += d;
|
|
digest[4] += e;
|
|
}
|
|
EXPORT_SYMBOL(sha_transform);
|
|
|
|
/**
|
|
* sha_init - initialize the vectors for a SHA1 digest
|
|
* @buf: vector to initialize
|
|
*/
|
|
void sha_init(__u32 *buf)
|
|
{
|
|
buf[0] = 0x67452301;
|
|
buf[1] = 0xefcdab89;
|
|
buf[2] = 0x98badcfe;
|
|
buf[3] = 0x10325476;
|
|
buf[4] = 0xc3d2e1f0;
|
|
}
|
|
|