mirror of
https://github.com/tillitis/tillitis-key1.git
synced 2024-12-12 09:24:26 -05:00
352 lines
9.8 KiB
C
352 lines
9.8 KiB
C
//======================================================================
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//
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// blake2s.c
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// ---------
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//
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// A simple blake2s Reference Implementation.
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//======================================================================
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#include "../types.h"
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#include "../lib.h"
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#include "blake2s.h"
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// Dummy printf() for verbose mode
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static void printf(const char *format, ...)
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{
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}
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#define VERBOSE 0
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#define SHOW_V 0
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#define SHOW_M_WORDS 0
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// Cyclic right rotation.
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#ifndef ROTR32
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#define ROTR32(x, y) (((x) >> (y)) ^ ((x) << (32 - (y))))
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#endif
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// Little-endian byte access.
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#define B2S_GET32(p) \
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(((uint32_t) ((uint8_t *) (p))[0]) ^ \
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(((uint32_t) ((uint8_t *) (p))[1]) << 8) ^ \
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(((uint32_t) ((uint8_t *) (p))[2]) << 16) ^ \
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(((uint32_t) ((uint8_t *) (p))[3]) << 24))
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// Initialization Vector.
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static const uint32_t blake2s_iv[8] = {
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0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
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0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
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};
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//------------------------------------------------------------------
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//------------------------------------------------------------------
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void print_v(uint32_t *v) {
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", v[0], v[1], v[2], v[3]);
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", v[4], v[5], v[6], v[7]);
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", v[8], v[9], v[10], v[11]);
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x\n", v[12], v[13], v[14], v[15]);
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printf("\n");
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}
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//------------------------------------------------------------------
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// print_ctx()
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// Print the contents of the context data structure.
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//------------------------------------------------------------------
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void print_ctx(blake2s_ctx *ctx) {
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printf("Chained state (h):\n");
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x, ",
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ctx->h[0], ctx->h[1], ctx->h[2], ctx->h[3]);
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printf("0x%08x, 0x%08x, 0x%08x, 0x%08x",
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ctx->h[4], ctx->h[5], ctx->h[6], ctx->h[7]);
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printf("\n");
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printf("Byte counter (t):\n");
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printf("0x%08x, 0x%08x", ctx->t[0], ctx->t[1]);
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printf("\n");
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printf("\n");
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}
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//------------------------------------------------------------------
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// B2S_G macro redefined as a G function.
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// Allows us to output intermediate values for debugging.
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//------------------------------------------------------------------
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void G(uint32_t *v, uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t x, uint32_t y) {
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if (VERBOSE) {
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printf("G started.\n");
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}
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if (SHOW_V) {
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printf("v before processing:\n");
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print_v(&v[0]);
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}
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if (SHOW_M_WORDS) {
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printf("x: 0x%08x, y: 0x%08x\n", x, y);
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}
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v[a] = v[a] + v[b] + x;
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v[d] = ROTR32(v[d] ^ v[a], 16);
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v[c] = v[c] + v[d];
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v[b] = ROTR32(v[b] ^ v[c], 12);
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v[a] = v[a] + v[b] + y;
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v[d] = ROTR32(v[d] ^ v[a], 8);
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v[c] = v[c] + v[d];
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v[b] = ROTR32(v[b] ^ v[c], 7);
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if (SHOW_V) {
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printf("v after processing:\n");
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print_v(&v[0]);
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}
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if (VERBOSE) {
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printf("G completed.\n\n");
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}
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}
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//------------------------------------------------------------------
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// Compression function. "last" flag indicates last block.
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//------------------------------------------------------------------
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static void blake2s_compress(blake2s_ctx *ctx, int last)
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{
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const uint8_t sigma[10][16] = {
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{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
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{14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3},
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{11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4},
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{7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8},
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{9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13},
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{2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9},
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{12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11},
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{13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10},
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{6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5},
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{10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0}
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};
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int i;
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uint32_t v[16], m[16];
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if (VERBOSE) {
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printf("blake2s_compress started.\n");
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}
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// init work variables
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for (i = 0; i < 8; i++) {
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v[i] = ctx->h[i];
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v[i + 8] = blake2s_iv[i];
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}
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// low 32 bits of offset
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// high 32 bits
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if (VERBOSE) {
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printf("t[0]: 0x%08x, t[1]: 0x%08x\n", ctx->t[0], ctx->t[1]);
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}
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v[12] ^= ctx->t[0];
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v[13] ^= ctx->t[1];
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// last block flag set ?
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if (last) {
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v[14] = ~v[14];
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}
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// get little-endian words
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for (i = 0; i < 16; i++) {
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m[i] = B2S_GET32(&ctx->b[4 * i]);
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}
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if (VERBOSE) {
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printf("v before G processing:\n");
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print_v(&v[0]);
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}
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// Ten rounds of the G function applied on rows, diagonal.
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for (i = 0; i < 10; i++) {
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if (VERBOSE) {
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printf("Round %02d:\n", (i + 1));
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printf("Row processing started.\n");
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}
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G(&v[0], 0, 4, 8, 12, m[sigma[i][ 0]], m[sigma[i][ 1]]);
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G(&v[0], 1, 5, 9, 13, m[sigma[i][ 2]], m[sigma[i][ 3]]);
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G(&v[0], 2, 6, 10, 14, m[sigma[i][ 4]], m[sigma[i][ 5]]);
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G(&v[0], 3, 7, 11, 15, m[sigma[i][ 6]], m[sigma[i][ 7]]);
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if (VERBOSE) {
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printf("Row processing completed.\n");
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printf("Diagonal processing started.\n");
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}
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G(&v[0], 0, 5, 10, 15, m[sigma[i][ 8]], m[sigma[i][ 9]]);
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G(&v[0], 1, 6, 11, 12, m[sigma[i][10]], m[sigma[i][11]]);
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G(&v[0], 2, 7, 8, 13, m[sigma[i][12]], m[sigma[i][13]]);
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G(&v[0], 3, 4, 9, 14, m[sigma[i][14]], m[sigma[i][15]]);
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if (VERBOSE) {
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printf("Diagonal processing completed.\n");
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printf("\n");
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}
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}
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if (VERBOSE) {
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printf("v after G processing:\n");
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print_v(&v[0]);
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}
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// Update the hash state.
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for (i = 0; i < 8; ++i) {
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ctx->h[i] ^= v[i] ^ v[i + 8];
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}
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if (VERBOSE) {
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printf("blake2s_compress completed.\n");
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}
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}
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//------------------------------------------------------------------
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// Initialize the hashing context "ctx" with optional key "key".
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// 1 <= outlen <= 32 gives the digest size in bytes.
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// Secret key (also <= 32 bytes) is optional (keylen = 0).
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//------------------------------------------------------------------
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int blake2s_init(blake2s_ctx *ctx, size_t outlen,
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const void *key, size_t keylen) // (keylen=0: no key)
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{
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size_t i;
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if (VERBOSE) {
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printf("blake2s_init started.\n");
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printf("Context before blake2s_init processing:\n");
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print_ctx(ctx);
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}
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if (outlen == 0 || outlen > 32 || keylen > 32)
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return -1; // illegal parameters
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for (i = 0; i < 8; i++) // state, "param block"
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ctx->h[i] = blake2s_iv[i];
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ctx->h[0] ^= 0x01010000 ^ (keylen << 8) ^ outlen;
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ctx->t[0] = 0; // input count low word
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ctx->t[1] = 0; // input count high word
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ctx->c = 0; // pointer within buffer
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ctx->outlen = outlen;
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for (i = keylen; i < 64; i++) // zero input block
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ctx->b[i] = 0;
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if (keylen > 0) {
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blake2s_update(ctx, key, keylen);
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ctx->c = 64; // at the end
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}
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if (VERBOSE) {
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printf("Context after blake2s_init processing:\n");
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print_ctx(ctx);
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printf("blake2s_init completed.\n");
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}
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return 0;
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}
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//------------------------------------------------------------------
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// Add "inlen" bytes from "in" into the hash.
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//------------------------------------------------------------------
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void blake2s_update(blake2s_ctx *ctx,
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const void *in, size_t inlen) // data bytes
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{
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size_t i;
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if (VERBOSE) {
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printf("blake2s_update started.\n");
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printf("Context before blake2s_update processing:\n");
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print_ctx(ctx);
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}
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for (i = 0; i < inlen; i++) {
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if (ctx->c == 64) { // buffer full ?
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ctx->t[0] += ctx->c; // add counters
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if (ctx->t[0] < ctx->c) // carry overflow ?
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ctx->t[1]++; // high word
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blake2s_compress(ctx, 0); // compress (not last)
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ctx->c = 0; // counter to zero
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}
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ctx->b[ctx->c++] = ((const uint8_t *) in)[i];
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}
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if (VERBOSE) {
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printf("Context after blake2s_update processing:\n");
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print_ctx(ctx);
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printf("blake2s_update completed.\n");
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}
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}
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//------------------------------------------------------------------
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// Generate the message digest (size given in init).
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// Result placed in "out".
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//------------------------------------------------------------------
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void blake2s_final(blake2s_ctx *ctx, void *out)
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{
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size_t i;
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if (VERBOSE) {
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printf("blake2s_final started.\n");
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printf("Context before blake2s_final processing:\n");
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print_ctx(ctx);
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}
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ctx->t[0] += ctx->c; // mark last block offset
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// carry overflow
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// high word
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if (ctx->t[0] < ctx->c) {
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ctx->t[1]++;
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}
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// fill up with zeros
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// final block flag = 1
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while (ctx->c < 64) {
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ctx->b[ctx->c++] = 0;
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}
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blake2s_compress(ctx, 1);
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// little endian convert and store
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for (i = 0; i < ctx->outlen; i++) {
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((uint8_t *) out)[i] =
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(ctx->h[i >> 2] >> (8 * (i & 3))) & 0xFF;
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}
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if (VERBOSE) {
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printf("Context after blake2s_final processing:\n");
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print_ctx(ctx);
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printf("blake2s_final completed.\n");
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}
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}
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//------------------------------------------------------------------
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// Convenience function for all-in-one computation.
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//------------------------------------------------------------------
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int blake2s(void *out, size_t outlen,
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const void *key, size_t keylen,
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const void *in, size_t inlen,
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blake2s_ctx *ctx)
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{
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if (blake2s_init(ctx, outlen, key, keylen))
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return -1;
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blake2s_update(ctx, in, inlen);
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blake2s_final(ctx, out);
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return 0;
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}
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//======================================================================
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//======================================================================
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