| /* |
| * SHA-256, as specified in |
| * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf |
| * |
| * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>. |
| * |
| * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> |
| * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> |
| * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
| * Copyright (c) 2014 Red Hat Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| */ |
| |
| #include <linux/bitops.h> |
| #include <linux/sha256.h> |
| #include <linux/string.h> |
| #include <asm/byteorder.h> |
| |
| static inline u32 Ch(u32 x, u32 y, u32 z) |
| { |
| return z ^ (x & (y ^ z)); |
| } |
| |
| static inline u32 Maj(u32 x, u32 y, u32 z) |
| { |
| return (x & y) | (z & (x | y)); |
| } |
| |
| #define e0(x) (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22)) |
| #define e1(x) (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25)) |
| #define s0(x) (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3)) |
| #define s1(x) (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10)) |
| |
| static inline void LOAD_OP(int I, u32 *W, const u8 *input) |
| { |
| W[I] = __be32_to_cpu(((__be32 *)(input))[I]); |
| } |
| |
| static inline void BLEND_OP(int I, u32 *W) |
| { |
| W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; |
| } |
| |
| static void sha256_transform(u32 *state, const u8 *input) |
| { |
| u32 a, b, c, d, e, f, g, h, t1, t2; |
| u32 W[64]; |
| int i; |
| |
| /* load the input */ |
| for (i = 0; i < 16; i++) |
| LOAD_OP(i, W, input); |
| |
| /* now blend */ |
| for (i = 16; i < 64; i++) |
| BLEND_OP(i, W); |
| |
| /* load the state into our registers */ |
| a = state[0]; b = state[1]; c = state[2]; d = state[3]; |
| e = state[4]; f = state[5]; g = state[6]; h = state[7]; |
| |
| /* now iterate */ |
| t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0]; |
| t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; |
| t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1]; |
| t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; |
| t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2]; |
| t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; |
| t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3]; |
| t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; |
| t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4]; |
| t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; |
| t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5]; |
| t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; |
| t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6]; |
| t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; |
| t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7]; |
| t2 = e0(b) + Maj(b, c, d); e += t1; a = t1 + t2; |
| |
| t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8]; |
| t2 = e0(a) + Maj(a, b, c); d += t1; h = t1 + t2; |
| t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9]; |
| t2 = e0(h) + Maj(h, a, b); c += t1; g = t1 + t2; |
| t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10]; |
| t2 = e0(g) + Maj(g, h, a); b += t1; f = t1 + t2; |
| t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11]; |
| t2 = e0(f) + Maj(f, g, h); a += t1; e = t1 + t2; |
| t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12]; |
| t2 = e0(e) + Maj(e, f, g); h += t1; d = t1 + t2; |
| t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13]; |
| t2 = e0(d) + Maj(d, e, f); g += t1; c = t1 + t2; |
| t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14]; |
| t2 = e0(c) + Maj(c, d, e); f += t1; b = t1 + t2; |
| t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15]; |
| t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2; |
| |
| t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16]; |
| t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2; |
| t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17]; |
| t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2; |
| t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18]; |
| t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2; |
| t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19]; |
| t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2; |
| t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20]; |
| t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2; |
| t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21]; |
| t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2; |
| t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22]; |
| t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2; |
| t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23]; |
| t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2; |
| |
| t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24]; |
| t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2; |
| t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25]; |
| t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2; |
| t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26]; |
| t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2; |
| t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27]; |
| t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2; |
| t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28]; |
| t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2; |
| t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29]; |
| t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2; |
| t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30]; |
| t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2; |
| t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31]; |
| t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2; |
| |
| t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32]; |
| t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2; |
| t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33]; |
| t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2; |
| t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34]; |
| t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2; |
| t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35]; |
| t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2; |
| t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36]; |
| t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2; |
| t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37]; |
| t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2; |
| t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38]; |
| t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2; |
| t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39]; |
| t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2; |
| |
| t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40]; |
| t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2; |
| t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41]; |
| t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2; |
| t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42]; |
| t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2; |
| t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43]; |
| t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2; |
| t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44]; |
| t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2; |
| t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45]; |
| t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2; |
| t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46]; |
| t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2; |
| t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47]; |
| t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2; |
| |
| t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48]; |
| t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2; |
| t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49]; |
| t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2; |
| t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50]; |
| t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2; |
| t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51]; |
| t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2; |
| t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52]; |
| t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2; |
| t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53]; |
| t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2; |
| t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54]; |
| t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2; |
| t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55]; |
| t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2; |
| |
| t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56]; |
| t2 = e0(a) + Maj(a, b, c); d += t1; h = t1+t2; |
| t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57]; |
| t2 = e0(h) + Maj(h, a, b); c += t1; g = t1+t2; |
| t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58]; |
| t2 = e0(g) + Maj(g, h, a); b += t1; f = t1+t2; |
| t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59]; |
| t2 = e0(f) + Maj(f, g, h); a += t1; e = t1+t2; |
| t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60]; |
| t2 = e0(e) + Maj(e, f, g); h += t1; d = t1+t2; |
| t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61]; |
| t2 = e0(d) + Maj(d, e, f); g += t1; c = t1+t2; |
| t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62]; |
| t2 = e0(c) + Maj(c, d, e); f += t1; b = t1+t2; |
| t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63]; |
| t2 = e0(b) + Maj(b, c, d); e += t1; a = t1+t2; |
| |
| state[0] += a; state[1] += b; state[2] += c; state[3] += d; |
| state[4] += e; state[5] += f; state[6] += g; state[7] += h; |
| |
| /* clear any sensitive info... */ |
| a = b = c = d = e = f = g = h = t1 = t2 = 0; |
| memset(W, 0, 64 * sizeof(u32)); |
| } |
| |
| int sha256_init(struct sha256_state *sctx) |
| { |
| sctx->state[0] = SHA256_H0; |
| sctx->state[1] = SHA256_H1; |
| sctx->state[2] = SHA256_H2; |
| sctx->state[3] = SHA256_H3; |
| sctx->state[4] = SHA256_H4; |
| sctx->state[5] = SHA256_H5; |
| sctx->state[6] = SHA256_H6; |
| sctx->state[7] = SHA256_H7; |
| sctx->count = 0; |
| |
| return 0; |
| } |
| |
| int sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len) |
| { |
| unsigned int partial, done; |
| const u8 *src; |
| |
| partial = sctx->count & 0x3f; |
| sctx->count += len; |
| done = 0; |
| src = data; |
| |
| if ((partial + len) > 63) { |
| if (partial) { |
| done = -partial; |
| memcpy(sctx->buf + partial, data, done + 64); |
| src = sctx->buf; |
| } |
| |
| do { |
| sha256_transform(sctx->state, src); |
| done += 64; |
| src = data + done; |
| } while (done + 63 < len); |
| |
| partial = 0; |
| } |
| memcpy(sctx->buf + partial, src, len - done); |
| |
| return 0; |
| } |
| |
| int sha256_final(struct sha256_state *sctx, u8 *out) |
| { |
| __be32 *dst = (__be32 *)out; |
| __be64 bits; |
| unsigned int index, pad_len; |
| int i; |
| static const u8 padding[64] = { 0x80, }; |
| |
| /* Save number of bits */ |
| bits = cpu_to_be64(sctx->count << 3); |
| |
| /* Pad out to 56 mod 64. */ |
| index = sctx->count & 0x3f; |
| pad_len = (index < 56) ? (56 - index) : ((64+56) - index); |
| sha256_update(sctx, padding, pad_len); |
| |
| /* Append length (before padding) */ |
| sha256_update(sctx, (const u8 *)&bits, sizeof(bits)); |
| |
| /* Store state in digest */ |
| for (i = 0; i < 8; i++) |
| dst[i] = cpu_to_be32(sctx->state[i]); |
| |
| /* Zeroize sensitive information. */ |
| memset(sctx, 0, sizeof(*sctx)); |
| |
| return 0; |
| } |
