/* * 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 __u32 *)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; }