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sha256.c
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sha256.c
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/* A super simple SHA-256 implementation by Kevin K. Biju.
Written in standard C89/ANSI-C, with endian agnosticness. */
#ifndef __STDC__
#error "C89/ANSI-C support not complete [missing __STDC__], refusing to compile."
#endif
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#if CHAR_BIT != 8
#error "CHAR_BIT not 8, refusing to compile."
#endif
#define AS_U32(input) ((u32) input)
#define RIGHT_ROTATE(input, dist) ((input >> dist) | (input << (32u - dist)))
#define INVALID_DATA_TYPES_ERROR "Invalid data-types provided. Please recompile with proper typedefs. Aborting.\n"
#define FILE_OPEN_ERROR "File could not be opened. Aborting.\n"
#define FILE_READ_ERROR "Error reading file. Aborting.\n"
typedef unsigned char u8;
typedef unsigned int u32;
u8 working_buffer[256];
u32 hash_values[8] =
{ 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
u32 round_hash_values[8];
const u32 round_constants[64] =
{ 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 };
void assert_processor(void)
{
u8 u8_test = 0u;
u32 u32_test = 0u;
u8_test--;
u32_test--;
if((u8_test < 0) || (u32_test < 0) || (sizeof(u8) != 1) || (sizeof(u32) != 4))
{
fprintf(stderr, INVALID_DATA_TYPES_ERROR);
exit(1);
}
}
u32 construct_u32(u8 index)
{
return ((((u32)working_buffer[(4u * index)]) << 24u) + (((u32)working_buffer[(4u * index) + 1u]) << 16u) + (((u32)working_buffer[(4u * index) + 2u]) << 8u) + ((u32)working_buffer[(4u * index) + 3u]));
}
void u32_to_buffer(u32 number, u8 index)
{
u8 loop_var = 0u;
for(; loop_var < 4u; loop_var++)
{
working_buffer[(4u * index) + loop_var] = (number) >> (8u * (3u - loop_var));
}
}
void processor()
{
u8 loop_var = 16u;
u32 temp_vars[6u];
for(; loop_var < 64u; loop_var++)
{
temp_vars[0u] = RIGHT_ROTATE(construct_u32(loop_var - 15u), 7u) ^ RIGHT_ROTATE(construct_u32(loop_var - 15u), 18u) ^ (construct_u32(loop_var - 15u) >> 3u);
temp_vars[1u] = RIGHT_ROTATE(construct_u32(loop_var - 2u), 17u) ^ RIGHT_ROTATE(construct_u32(loop_var - 2u), 19u) ^ (construct_u32(loop_var - 2u) >> 10u);
u32_to_buffer(construct_u32(loop_var - 16u) + temp_vars[0u] + construct_u32(loop_var - 7u) + temp_vars[1u], loop_var);
}
for(loop_var = 0u; loop_var < 8u; loop_var++)
{
round_hash_values[loop_var] = hash_values[loop_var];
}
for(loop_var = 0u; loop_var < 64u; loop_var++)
{
temp_vars[0u] = RIGHT_ROTATE(round_hash_values[4u], 6u) ^ RIGHT_ROTATE(round_hash_values[4u], 11u) ^ RIGHT_ROTATE(round_hash_values[4u], 25u);
temp_vars[1u] = (round_hash_values[4u] & round_hash_values[5u]) ^ (~(round_hash_values[4u]) & round_hash_values[6u]);
temp_vars[2u] = round_hash_values[7u] + temp_vars[0u] + temp_vars[1u] + round_constants[loop_var] + construct_u32(loop_var);
temp_vars[3u] = RIGHT_ROTATE(round_hash_values[0u], 2u) ^ RIGHT_ROTATE(round_hash_values[0u], 13u) ^ RIGHT_ROTATE(round_hash_values[0u], 22u);
temp_vars[4u] = (round_hash_values[0u] & round_hash_values[1u]) ^ (round_hash_values[0u] & round_hash_values[2u]) ^ (round_hash_values[1u] & round_hash_values[2u]);
temp_vars[5u] = temp_vars[3u] + temp_vars[4u];
round_hash_values[7u] = round_hash_values[6u];
round_hash_values[6u] = round_hash_values[5u];
round_hash_values[5u] = round_hash_values[4u];
round_hash_values[4u] = round_hash_values[3u] + temp_vars[2u];
round_hash_values[3u] = round_hash_values[2u];
round_hash_values[2u] = round_hash_values[1u];
round_hash_values[1u] = round_hash_values[0u];
round_hash_values[0u] = temp_vars[2u] + temp_vars[5u];
}
for(loop_var = 0u; loop_var < 8u; loop_var++)
{
hash_values[loop_var] = hash_values[loop_var] + round_hash_values[loop_var];
}
}
int main(int argc, char** argv)
{
FILE* file_handle;
u32 file_size_low = 0u;
u32 file_size_high = 0u;
u8 read_bytes;
assert_processor();
file_handle = fopen(argv[AS_U32(argc) - 1u], "rb");
if(file_handle == NULL)
{
fprintf(stderr, FILE_OPEN_ERROR);
exit(1);
}
while(!feof(file_handle))
{
read_bytes = fread(working_buffer, 1u, 64u, file_handle);
if(ferror(file_handle))
{
fprintf(stderr, FILE_READ_ERROR);
exit(1);
}
if((0xFFFFFFFFu - (8u * read_bytes)) <= file_size_low)
{
file_size_low = file_size_low - (0xFFFFFFFFu - (8u * read_bytes) + 1u);
file_size_high++;
}
else
{
file_size_low = file_size_low + (8u * read_bytes);
}
if(read_bytes < 64u)
{
if(read_bytes < 56u)
{
working_buffer[read_bytes++] = 0x80u;
for(; read_bytes < 56u; read_bytes++)
{
working_buffer[read_bytes] = 0u;
}
for(; read_bytes < 60u; read_bytes++)
{
working_buffer[read_bytes] = (file_size_high) >> (8u * (59u - read_bytes));
}
for(; read_bytes < 64u; read_bytes++)
{
working_buffer[read_bytes] = (file_size_low) >> (8u * (63u - read_bytes));
}
processor();
}
else
{
working_buffer[read_bytes++] = 0x80u;
for(; read_bytes < 64u; read_bytes++)
{
working_buffer[read_bytes] = 0u;
}
processor();
for(read_bytes = 0u; read_bytes < 56u; read_bytes++)
{
working_buffer[read_bytes] = 0u;
}
for(; read_bytes < 60u; read_bytes++)
{
working_buffer[read_bytes] = (file_size_high) >> (8u * (59u - read_bytes));
}
for(; read_bytes < 64u; read_bytes++)
{
working_buffer[read_bytes] = (file_size_low) >> (8u * (63u - read_bytes));
}
processor();
}
}
else
{
processor();
}
}
printf("%s - ", argv[AS_U32(argc) - 1u]);
for(read_bytes = 0; read_bytes < 8u; read_bytes++)
{
printf("%08x", hash_values[read_bytes]);
}
printf("\n");
fclose(file_handle);
return 0;
}