README.md
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/*
* sha512.c - mbed TLS (formerly known as PolarSSL) implementation of SHA512
*
* Modifications Copyright 2017 Google Inc.
* Modifications Author: Joe Richey ([email protected])
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
/*
* FIPS-180-2 compliant SHA-512 implementation
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
/*
* The SHA-512 Secure Hash Standard was published by NIST in 2002.
*
* http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
*/
#include "sha512.h"
#include <string.h> // (memset_s or explicit_bzero if available)
#if defined(_MSC_VER) || defined(__WATCOMC__)
#define UL64(x) x##ui64
#else
#define UL64(x) x##ULL
#endif
/* We either use dedicated memory clearing functions or volatile dereference. */
void secure_wipe(uint8_t *v, uint32_t n) {
#if defined memset_s
memset_s(v, n, 0, n);
#elif defined explicit_bzero
explicit_bzero(v, n);
#else
volatile uint8_t *p = v;
while (n--) *p++ = 0;
#endif
}
/*
* SHA-512 context structure
*/
typedef struct {
uint64_t total[2]; /*!< number of bytes processed */
uint64_t state[8]; /*!< intermediate digest state */
unsigned char buffer[128]; /*!< data block being processed */
} mbedtls_sha512_context;
/*
* 64-bit integer manipulation macros (big endian)
*/
#ifndef GET_UINT64_BE
#define GET_UINT64_BE(n, b, i) \
{ \
(n) = ((uint64_t)(b)[(i)] << 56) | ((uint64_t)(b)[(i) + 1] << 48) | \
((uint64_t)(b)[(i) + 2] << 40) | ((uint64_t)(b)[(i) + 3] << 32) | \
((uint64_t)(b)[(i) + 4] << 24) | ((uint64_t)(b)[(i) + 5] << 16) | \
((uint64_t)(b)[(i) + 6] << 8) | ((uint64_t)(b)[(i) + 7]); \
}
#endif /* GET_UINT64_BE */
#ifndef PUT_UINT64_BE
#define PUT_UINT64_BE(n, b, i) \
{ \
(b)[(i)] = (unsigned char)((n) >> 56); \
(b)[(i) + 1] = (unsigned char)((n) >> 48); \
(b)[(i) + 2] = (unsigned char)((n) >> 40); \
(b)[(i) + 3] = (unsigned char)((n) >> 32); \
(b)[(i) + 4] = (unsigned char)((n) >> 24); \
(b)[(i) + 5] = (unsigned char)((n) >> 16); \
(b)[(i) + 6] = (unsigned char)((n) >> 8); \
(b)[(i) + 7] = (unsigned char)((n)); \
}
#endif /* PUT_UINT64_BE */
static void mbedtls_sha512_init(mbedtls_sha512_context *ctx) {
memset(ctx, 0, sizeof(mbedtls_sha512_context));
}
/*
* SHA-512 context setup
*/
static void mbedtls_sha512_starts(mbedtls_sha512_context *ctx) {
ctx->total[0] = 0;
ctx->total[1] = 0;
ctx->state[0] = UL64(0x6A09E667F3BCC908);
ctx->state[1] = UL64(0xBB67AE8584CAA73B);
ctx->state[2] = UL64(0x3C6EF372FE94F82B);
ctx->state[3] = UL64(0xA54FF53A5F1D36F1);
ctx->state[4] = UL64(0x510E527FADE682D1);
ctx->state[5] = UL64(0x9B05688C2B3E6C1F);
ctx->state[6] = UL64(0x1F83D9ABFB41BD6B);
ctx->state[7] = UL64(0x5BE0CD19137E2179);
}
/*
* Round constants
*/
static const uint64_t K[80] = {
UL64(0x428A2F98D728AE22), UL64(0x7137449123EF65CD),
UL64(0xB5C0FBCFEC4D3B2F), UL64(0xE9B5DBA58189DBBC),
UL64(0x3956C25BF348B538), UL64(0x59F111F1B605D019),
UL64(0x923F82A4AF194F9B), UL64(0xAB1C5ED5DA6D8118),
UL64(0xD807AA98A3030242), UL64(0x12835B0145706FBE),
UL64(0x243185BE4EE4B28C), UL64(0x550C7DC3D5FFB4E2),
UL64(0x72BE5D74F27B896F), UL64(0x80DEB1FE3B1696B1),
UL64(0x9BDC06A725C71235), UL64(0xC19BF174CF692694),
UL64(0xE49B69C19EF14AD2), UL64(0xEFBE4786384F25E3),
UL64(0x0FC19DC68B8CD5B5), UL64(0x240CA1CC77AC9C65),
UL64(0x2DE92C6F592B0275), UL64(0x4A7484AA6EA6E483),
UL64(0x5CB0A9DCBD41FBD4), UL64(0x76F988DA831153B5),
UL64(0x983E5152EE66DFAB), UL64(0xA831C66D2DB43210),
UL64(0xB00327C898FB213F), UL64(0xBF597FC7BEEF0EE4),
UL64(0xC6E00BF33DA88FC2), UL64(0xD5A79147930AA725),
UL64(0x06CA6351E003826F), UL64(0x142929670A0E6E70),
UL64(0x27B70A8546D22FFC), UL64(0x2E1B21385C26C926),
UL64(0x4D2C6DFC5AC42AED), UL64(0x53380D139D95B3DF),
UL64(0x650A73548BAF63DE), UL64(0x766A0ABB3C77B2A8),
UL64(0x81C2C92E47EDAEE6), UL64(0x92722C851482353B),
UL64(0xA2BFE8A14CF10364), UL64(0xA81A664BBC423001),
UL64(0xC24B8B70D0F89791), UL64(0xC76C51A30654BE30),
UL64(0xD192E819D6EF5218), UL64(0xD69906245565A910),
UL64(0xF40E35855771202A), UL64(0x106AA07032BBD1B8),
UL64(0x19A4C116B8D2D0C8), UL64(0x1E376C085141AB53),
UL64(0x2748774CDF8EEB99), UL64(0x34B0BCB5E19B48A8),
UL64(0x391C0CB3C5C95A63), UL64(0x4ED8AA4AE3418ACB),
UL64(0x5B9CCA4F7763E373), UL64(0x682E6FF3D6B2B8A3),
UL64(0x748F82EE5DEFB2FC), UL64(0x78A5636F43172F60),
UL64(0x84C87814A1F0AB72), UL64(0x8CC702081A6439EC),
UL64(0x90BEFFFA23631E28), UL64(0xA4506CEBDE82BDE9),
UL64(0xBEF9A3F7B2C67915), UL64(0xC67178F2E372532B),
UL64(0xCA273ECEEA26619C), UL64(0xD186B8C721C0C207),
UL64(0xEADA7DD6CDE0EB1E), UL64(0xF57D4F7FEE6ED178),
UL64(0x06F067AA72176FBA), UL64(0x0A637DC5A2C898A6),
UL64(0x113F9804BEF90DAE), UL64(0x1B710B35131C471B),
UL64(0x28DB77F523047D84), UL64(0x32CAAB7B40C72493),
UL64(0x3C9EBE0A15C9BEBC), UL64(0x431D67C49C100D4C),
UL64(0x4CC5D4BECB3E42B6), UL64(0x597F299CFC657E2A),
UL64(0x5FCB6FAB3AD6FAEC), UL64(0x6C44198C4A475817)};
static void mbedtls_sha512_process(mbedtls_sha512_context *ctx,
const unsigned char data[128]) {
int i;
uint64_t temp1, temp2, W[80];
uint64_t A, B, C, D, E, F, G, H;
#define SHR(x, n) (x >> n)
#define ROTR(x, n) (SHR(x, n) | (x << (64 - n)))
#define S0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHR(x, 7))
#define S1(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHR(x, 6))
#define S2(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
#define S3(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
#define F0(x, y, z) ((x & y) | (z & (x | y)))
#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define P(a, b, c, d, e, f, g, h, x, K) \
{ \
temp1 = h + S3(e) + F1(e, f, g) + K + x; \
temp2 = S2(a) + F0(a, b, c); \
d += temp1; \
h = temp1 + temp2; \
}
for (i = 0; i < 16; i++) {
GET_UINT64_BE(W[i], data, i << 3);
}
for (; i < 80; i++) {
W[i] = S1(W[i - 2]) + W[i - 7] + S0(W[i - 15]) + W[i - 16];
}
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
E = ctx->state[4];
F = ctx->state[5];
G = ctx->state[6];
H = ctx->state[7];
i = 0;
do {
P(A, B, C, D, E, F, G, H, W[i], K[i]);
i++;
P(H, A, B, C, D, E, F, G, W[i], K[i]);
i++;
P(G, H, A, B, C, D, E, F, W[i], K[i]);
i++;
P(F, G, H, A, B, C, D, E, W[i], K[i]);
i++;
P(E, F, G, H, A, B, C, D, W[i], K[i]);
i++;
P(D, E, F, G, H, A, B, C, W[i], K[i]);
i++;
P(C, D, E, F, G, H, A, B, W[i], K[i]);
i++;
P(B, C, D, E, F, G, H, A, W[i], K[i]);
i++;
} while (i < 80);
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D;
ctx->state[4] += E;
ctx->state[5] += F;
ctx->state[6] += G;
ctx->state[7] += H;
}
/*
* SHA-512 process buffer
*/
static void mbedtls_sha512_update(mbedtls_sha512_context *ctx,
const unsigned char *input, size_t ilen) {
size_t fill;
unsigned int left;
if (ilen == 0) return;
left = (unsigned int)(ctx->total[0] & 0x7F);
fill = 128 - left;
ctx->total[0] += (uint64_t)ilen;
if (ctx->total[0] < (uint64_t)ilen) ctx->total[1]++;
if (left && ilen >= fill) {
memcpy((void *)(ctx->buffer + left), input, fill);
mbedtls_sha512_process(ctx, ctx->buffer);
input += fill;
ilen -= fill;
left = 0;
}
while (ilen >= 128) {
mbedtls_sha512_process(ctx, input);
input += 128;
ilen -= 128;
}
if (ilen > 0) memcpy((void *)(ctx->buffer + left), input, ilen);
}
static const unsigned char sha512_padding[128] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
/*
* SHA-512 final digest
*/
static void mbedtls_sha512_finish(mbedtls_sha512_context *ctx,
unsigned char output[64]) {
size_t last, padn;
uint64_t high, low;
unsigned char msglen[16];
high = (ctx->total[0] >> 61) | (ctx->total[1] << 3);
low = (ctx->total[0] << 3);
PUT_UINT64_BE(high, msglen, 0);
PUT_UINT64_BE(low, msglen, 8);
last = (size_t)(ctx->total[0] & 0x7F);
padn = (last < 112) ? (112 - last) : (240 - last);
mbedtls_sha512_update(ctx, sha512_padding, padn);
mbedtls_sha512_update(ctx, msglen, 16);
PUT_UINT64_BE(ctx->state[0], output, 0);
PUT_UINT64_BE(ctx->state[1], output, 8);
PUT_UINT64_BE(ctx->state[2], output, 16);
PUT_UINT64_BE(ctx->state[3], output, 24);
PUT_UINT64_BE(ctx->state[4], output, 32);
PUT_UINT64_BE(ctx->state[5], output, 40);
PUT_UINT64_BE(ctx->state[6], output, 48);
PUT_UINT64_BE(ctx->state[7], output, 56);
}
/*
* output = SHA-512( input buffer )
*/
void SHA512(const uint8_t *in, size_t n, uint8_t out[SHA512_DIGEST_LENGTH]) {
mbedtls_sha512_context ctx;
mbedtls_sha512_init(&ctx);
mbedtls_sha512_starts(&ctx);
mbedtls_sha512_update(&ctx, in, n);
mbedtls_sha512_finish(&ctx, out);
secure_wipe((uint8_t *)&ctx, sizeof(ctx));
}