322 lines
9.9 KiB
C
322 lines
9.9 KiB
C
/*
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* Copyright (C) 2015-2018 Alibaba Group Holding Limited
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*/
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#include "infra_config.h"
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#ifdef INFRA_SHA256
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#define INFRA_SHA256_SMALLER
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#include <stdlib.h>
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#include <string.h>
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#include "infra_sha256.h"
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#define SHA256_KEY_IOPAD_SIZE (64)
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#define SHA256_DIGEST_SIZE (32)
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/*
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* 32-bit integer manipulation macros (big endian)
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*/
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#ifndef GET_UINT32_BE
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#define GET_UINT32_BE(n,b,i) \
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do { \
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(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
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| ( (uint32_t) (b)[(i) + 1] << 16 ) \
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| ( (uint32_t) (b)[(i) + 2] << 8 ) \
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| ( (uint32_t) (b)[(i) + 3] ); \
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} while( 0 )
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#endif
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#ifndef PUT_UINT32_BE
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#define PUT_UINT32_BE(n,b,i) \
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do { \
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(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
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(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
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(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
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(b)[(i) + 3] = (unsigned char) ( (n) ); \
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} while( 0 )
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#endif
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static void utils_sha256_zeroize(void *v, uint32_t n)
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{
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volatile unsigned char *p = v;
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while (n--) {
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*p++ = 0;
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}
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}
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void utils_sha256_init(iot_sha256_context *ctx)
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{
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memset(ctx, 0, sizeof(iot_sha256_context));
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}
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void utils_sha256_free(iot_sha256_context *ctx)
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{
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if (NULL == ctx) {
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return;
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}
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utils_sha256_zeroize(ctx, sizeof(iot_sha256_context));
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}
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void utils_sha256_starts(iot_sha256_context *ctx)
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{
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int is224 = 0;
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ctx->total[0] = 0;
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ctx->total[1] = 0;
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if (is224 == 0) {
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/* SHA-256 */
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ctx->state[0] = 0x6A09E667;
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ctx->state[1] = 0xBB67AE85;
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ctx->state[2] = 0x3C6EF372;
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ctx->state[3] = 0xA54FF53A;
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ctx->state[4] = 0x510E527F;
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ctx->state[5] = 0x9B05688C;
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ctx->state[6] = 0x1F83D9AB;
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ctx->state[7] = 0x5BE0CD19;
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}
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ctx->is224 = is224;
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}
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static const uint32_t K[] = {
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0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5,
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0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
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0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3,
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0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
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0xE49B69C1, 0xEFBE4786, 0x0FC19DC6, 0x240CA1CC,
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0x2DE92C6F, 0x4A7484AA, 0x5CB0A9DC, 0x76F988DA,
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0x983E5152, 0xA831C66D, 0xB00327C8, 0xBF597FC7,
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0xC6E00BF3, 0xD5A79147, 0x06CA6351, 0x14292967,
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0x27B70A85, 0x2E1B2138, 0x4D2C6DFC, 0x53380D13,
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0x650A7354, 0x766A0ABB, 0x81C2C92E, 0x92722C85,
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0xA2BFE8A1, 0xA81A664B, 0xC24B8B70, 0xC76C51A3,
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0xD192E819, 0xD6990624, 0xF40E3585, 0x106AA070,
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0x19A4C116, 0x1E376C08, 0x2748774C, 0x34B0BCB5,
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0x391C0CB3, 0x4ED8AA4A, 0x5B9CCA4F, 0x682E6FF3,
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0x748F82EE, 0x78A5636F, 0x84C87814, 0x8CC70208,
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0x90BEFFFA, 0xA4506CEB, 0xBEF9A3F7, 0xC67178F2,
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};
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#define SHR(x,n) ((x & 0xFFFFFFFF) >> n)
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#define ROTR(x,n) (SHR(x,n) | (x << (32 - n)))
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#define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3))
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#define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10))
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#define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22))
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#define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25))
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#define F0(x,y,z) ((x & y) | (z & (x | y)))
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#define F1(x,y,z) (z ^ (x & (y ^ z)))
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#define R(t) \
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( \
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W[t] = S1(W[t - 2]) + W[t - 7] + \
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S0(W[t - 15]) + W[t - 16] \
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)
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#define P(a,b,c,d,e,f,g,h,x,K) \
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{ \
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temp1 = h + S3(e) + F1(e,f,g) + K + x; \
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temp2 = S2(a) + F0(a,b,c); \
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d += temp1; h = temp1 + temp2; \
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}
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void utils_sha256_process(iot_sha256_context *ctx, const unsigned char data[64])
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{
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uint32_t temp1, temp2, W[64];
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uint32_t A[8];
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unsigned int i;
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for (i = 0; i < 8; i++) {
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A[i] = ctx->state[i];
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}
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#if defined(INFRA_SHA256_SMALLER)
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for (i = 0; i < 64; i++) {
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if (i < 16) {
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GET_UINT32_BE(W[i], data, 4 * i);
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} else {
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R(i);
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}
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P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i], K[i]);
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temp1 = A[7];
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A[7] = A[6];
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A[6] = A[5];
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A[5] = A[4];
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A[4] = A[3];
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A[3] = A[2];
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A[2] = A[1];
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A[1] = A[0];
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A[0] = temp1;
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}
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#else /* INFRA_SHA256_SMALLER */
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for (i = 0; i < 16; i++) {
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GET_UINT32_BE(W[i], data, 4 * i);
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}
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for (i = 0; i < 16; i += 8) {
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P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], W[i + 0], K[i + 0]);
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P(A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], W[i + 1], K[i + 1]);
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P(A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], W[i + 2], K[i + 2]);
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P(A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], W[i + 3], K[i + 3]);
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P(A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], W[i + 4], K[i + 4]);
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P(A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], W[i + 5], K[i + 5]);
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P(A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], W[i + 6], K[i + 6]);
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P(A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], W[i + 7], K[i + 7]);
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}
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for (i = 16; i < 64; i += 8) {
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P(A[0], A[1], A[2], A[3], A[4], A[5], A[6], A[7], R(i + 0), K[i + 0]);
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P(A[7], A[0], A[1], A[2], A[3], A[4], A[5], A[6], R(i + 1), K[i + 1]);
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P(A[6], A[7], A[0], A[1], A[2], A[3], A[4], A[5], R(i + 2), K[i + 2]);
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P(A[5], A[6], A[7], A[0], A[1], A[2], A[3], A[4], R(i + 3), K[i + 3]);
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P(A[4], A[5], A[6], A[7], A[0], A[1], A[2], A[3], R(i + 4), K[i + 4]);
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P(A[3], A[4], A[5], A[6], A[7], A[0], A[1], A[2], R(i + 5), K[i + 5]);
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P(A[2], A[3], A[4], A[5], A[6], A[7], A[0], A[1], R(i + 6), K[i + 6]);
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P(A[1], A[2], A[3], A[4], A[5], A[6], A[7], A[0], R(i + 7), K[i + 7]);
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}
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#endif /* INFRA_SHA256_SMALLER */
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for (i = 0; i < 8; i++) {
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ctx->state[i] += A[i];
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}
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}
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void utils_sha256_update(iot_sha256_context *ctx, const unsigned char *input, uint32_t ilen)
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{
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size_t fill;
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uint32_t left;
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if (ilen == 0) {
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return;
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}
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left = ctx->total[0] & 0x3F;
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fill = 64 - left;
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ctx->total[0] += (uint32_t) ilen;
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ctx->total[0] &= 0xFFFFFFFF;
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if (ctx->total[0] < (uint32_t) ilen) {
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ctx->total[1]++;
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}
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if (left && ilen >= fill) {
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memcpy((void *)(ctx->buffer + left), input, fill);
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utils_sha256_process(ctx, ctx->buffer);
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input += fill;
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ilen -= fill;
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left = 0;
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}
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while (ilen >= 64) {
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utils_sha256_process(ctx, input);
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input += 64;
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ilen -= 64;
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}
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if (ilen > 0) {
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memcpy((void *)(ctx->buffer + left), input, ilen);
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}
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}
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static const unsigned char sha256_padding[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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void utils_sha256_finish(iot_sha256_context *ctx, uint8_t output[32])
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{
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uint32_t last, padn;
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uint32_t high, low;
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unsigned char msglen[8];
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high = (ctx->total[0] >> 29)
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| (ctx->total[1] << 3);
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low = (ctx->total[0] << 3);
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PUT_UINT32_BE(high, msglen, 0);
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PUT_UINT32_BE(low, msglen, 4);
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last = ctx->total[0] & 0x3F;
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padn = (last < 56) ? (56 - last) : (120 - last);
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utils_sha256_update(ctx, sha256_padding, padn);
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utils_sha256_update(ctx, msglen, 8);
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PUT_UINT32_BE(ctx->state[0], output, 0);
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PUT_UINT32_BE(ctx->state[1], output, 4);
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PUT_UINT32_BE(ctx->state[2], output, 8);
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PUT_UINT32_BE(ctx->state[3], output, 12);
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PUT_UINT32_BE(ctx->state[4], output, 16);
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PUT_UINT32_BE(ctx->state[5], output, 20);
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PUT_UINT32_BE(ctx->state[6], output, 24);
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if (ctx->is224 == 0) {
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PUT_UINT32_BE(ctx->state[7], output, 28);
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}
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}
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void utils_sha256(const uint8_t *input, uint32_t ilen, uint8_t output[32])
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{
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iot_sha256_context ctx;
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utils_sha256_init(&ctx);
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utils_sha256_starts(&ctx);
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utils_sha256_update(&ctx, input, ilen);
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utils_sha256_finish(&ctx, output);
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utils_sha256_free(&ctx);
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}
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void utils_hmac_sha256(const uint8_t *msg, uint32_t msg_len, const uint8_t *key, uint32_t key_len, uint8_t output[32])
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{
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iot_sha256_context context;
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uint8_t k_ipad[SHA256_KEY_IOPAD_SIZE]; /* inner padding - key XORd with ipad */
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uint8_t k_opad[SHA256_KEY_IOPAD_SIZE]; /* outer padding - key XORd with opad */
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int32_t i;
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if ((NULL == msg) || (NULL == key) || (NULL == output)) {
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return;
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}
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if (key_len > SHA256_KEY_IOPAD_SIZE) {
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return;
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}
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/* start out by storing key in pads */
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memset(k_ipad, 0, sizeof(k_ipad));
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memset(k_opad, 0, sizeof(k_opad));
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memcpy(k_ipad, key, key_len);
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memcpy(k_opad, key, key_len);
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/* XOR key with ipad and opad values */
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for (i = 0; i < SHA256_KEY_IOPAD_SIZE; i++) {
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k_ipad[i] ^= 0x36;
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k_opad[i] ^= 0x5c;
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}
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/* perform inner SHA */
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utils_sha256_init(&context); /* init context for 1st pass */
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utils_sha256_starts(&context); /* setup context for 1st pass */
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utils_sha256_update(&context, k_ipad, SHA256_KEY_IOPAD_SIZE); /* start with inner pad */
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utils_sha256_update(&context, msg, msg_len); /* then text of datagram */
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utils_sha256_finish(&context, output); /* finish up 1st pass */
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/* perform outer SHA */
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utils_sha256_init(&context); /* init context for 2nd pass */
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utils_sha256_starts(&context); /* setup context for 2nd pass */
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utils_sha256_update(&context, k_opad, SHA256_KEY_IOPAD_SIZE); /* start with outer pad */
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utils_sha256_update(&context, output, SHA256_DIGEST_SIZE); /* then results of 1st hash */
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utils_sha256_finish(&context, output); /* finish up 2nd pass */
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}
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#endif
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