sha256 algs
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phixxy
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2 changed files with 248 additions and 0 deletions
132
sha256.c
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132
sha256.c
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdbool.h>
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#include <stdint.h>
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uint32_t BIT_32_MASK = 0xFFFFFFFF;
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uint32_t right_rotate(uint32_t word, uint32_t amount){
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amount = amount % 32;
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return ((word >> amount) | (word << (32 - amount))) & BIT_32_MASK;
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}
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int main()
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{
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char message[151] = "";
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scanf("%[^\n]", message);
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// init hash values
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uint32_t h0 = 0x6a09e667;
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uint32_t h1 = 0xbb67ae85;
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uint32_t h2 = 0x3c6ef372;
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uint32_t h3 = 0xa54ff53a;
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uint32_t h4 = 0x510e527f;
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uint32_t h5 = 0x9b05688c;
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uint32_t h6 = 0x1f83d9ab;
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uint32_t h7 = 0x5be0cd19;
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uint32_t k[64] = {0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
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// Convert message to bytes and append "1 bit"
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int input_len = strlen(message);
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int base = input_len + 1 + 8;
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int zero_bytes_needed = 64 - ( base % 64);
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int total_bytes_msg_size = base + zero_bytes_needed;
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uint8_t byte_msg[total_bytes_msg_size];
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uint64_t L = strlen(message) * 8;
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for (int i = 0; i < total_bytes_msg_size; i++){
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if (i < input_len){
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byte_msg[i] = message[i];
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} else if (i == input_len){
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byte_msg[i] = 0b10000000;
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} else {
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byte_msg[i] = 0;
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}
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}
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// append L to end of byte_msg
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uint8_t L_bytes[8];
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for (int i = 0; i < 8; i++){
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int shift = 64 - ((i+1)*8);
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L_bytes[i] = (L >> shift) & 0xFF;
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}
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int start = total_bytes_msg_size - 8;
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for (int i = 0; i < 8; i++){
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byte_msg[start + i] = L_bytes[i];
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}
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// build chunks
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int NUM_CHUNKS = sizeof(byte_msg)/64;
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uint32_t chunks[NUM_CHUNKS][64];
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for (int chunk_num = 0; chunk_num < NUM_CHUNKS; chunk_num++){
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for (int i = 0; i < 16; i++){
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//every 4 bytes is 1 word
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int j = i + chunk_num * 16;
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uint32_t word = (byte_msg[j*4] << 24) | (byte_msg[j*4+1] << 16) | (byte_msg[j*4+2] << 8) | byte_msg[j*4+3];
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chunks[chunk_num][i] = word;
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}
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}
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// process hash
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for(int chunk_num = 0; chunk_num < NUM_CHUNKS; chunk_num++){
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for(int i = 16; i < 64; i++){
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uint32_t s0 = (right_rotate(chunks[chunk_num][i-15],
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(uint32_t)7) ^ right_rotate(chunks[chunk_num][i-15],
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(uint32_t)18) ^ (chunks[chunk_num][i-15] >> (uint32_t)3)) & BIT_32_MASK;
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uint32_t s1 = ((right_rotate(chunks[chunk_num][i-2],
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(uint32_t)17) ^ right_rotate(chunks[chunk_num][i-2],
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(uint32_t)19) ^ chunks[chunk_num][i-2] >> (uint32_t)10)) & BIT_32_MASK;
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chunks[chunk_num][i] = (chunks[chunk_num][i-16] + s0 + chunks[chunk_num][i-7] + s1) & BIT_32_MASK;
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}
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uint32_t a = h0;
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uint32_t b = h1;
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uint32_t c = h2;
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uint32_t d = h3;
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uint32_t e = h4;
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uint32_t f = h5;
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uint32_t g = h6;
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uint32_t h = h7;
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for (int i = 0; i < 64; i++){
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uint32_t s1 = (right_rotate(e,6) ^ right_rotate(e,11) ^ right_rotate(e,25)) & BIT_32_MASK;
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uint32_t ch = ((e & f) ^ ((~e) & g)) & BIT_32_MASK;
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uint32_t temp1 = (h + s1 + ch + k[i] + chunks[chunk_num][i]) & BIT_32_MASK;
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uint32_t s0 = (right_rotate(a,2) ^ right_rotate(a,13) ^ right_rotate(a,22)) & BIT_32_MASK;
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uint32_t maj = ((a & b) ^ (a & c) ^ (b & c)) & BIT_32_MASK;
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uint32_t temp2 = (s0 + maj) & BIT_32_MASK;
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h = g;
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g = f;
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f = e;
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e = (d + temp1) & BIT_32_MASK;
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d = c;
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c = b;
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b = a;
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a = (temp1 + temp2) & BIT_32_MASK;
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}
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h0 = (h0 + a) & BIT_32_MASK;
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h1 = (h1 + b) & BIT_32_MASK;
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h2 = (h2 + c) & BIT_32_MASK;
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h3 = (h3 + d) & BIT_32_MASK;
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h4 = (h4 + e) & BIT_32_MASK;
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h5 = (h5 + f) & BIT_32_MASK;
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h6 = (h6 + g) & BIT_32_MASK;
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h7 = (h7 + h) & BIT_32_MASK;
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}
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// print digest
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printf("%08x%08x%08x%08x%08x%08x%08x%08x", h0,h1,h2,h3,h4,h5,h6,h7);
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return 0;
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}
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116
sha256.py
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116
sha256.py
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@ -0,0 +1,116 @@
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message = input()
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BIT_32_MASK = 0xFFFFFFFF
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def convert_msg_to_bytes(message):
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byte_msg = []
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for letter in message:
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b = ord(letter)
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byte_msg.append(b)
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return byte_msg
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def right_rotate(word, amount):
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amount = amount % 32
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return ((word >> amount) | (word << (32 - amount))) & 0xFFFFFFFF
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# init hash values
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h0 = 0x6a09e667
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h1 = 0xbb67ae85
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h2 = 0x3c6ef372
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h3 = 0xa54ff53a
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h4 = 0x510e527f
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h5 = 0x9b05688c
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h6 = 0x1f83d9ab
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h7 = 0x5be0cd19
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# round of constants
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k = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2]
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# pre-processing
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byte_msg = convert_msg_to_bytes(message)
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L = len(byte_msg) * 8
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# append 1 bit to message (actually 8 bits)
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byte_msg.append(128) #appends 10000000, which is always safe
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# append K 0 bits to message where K is (L + 8 + K + 64) is lowest multiple of 512
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size = L + 8 + 64
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new_len = 512
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while new_len <= size:
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new_len += 512
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byte_msg.extend([0] * ((new_len - size)//8))
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# append L as a 64 bit big-endian int making the total post processed len a mult of 512 bits
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L_bytes = L.to_bytes(8, byteorder='big')
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byte_msg.extend(L_bytes)
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#<original message of len L> 1 <K zeros> <L as 64 bit int>, (the number of bits will be a mult of 512)
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# break into 512 bit chunks
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chunks = []
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for x in range(0,int(new_len/512)):
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tmp = byte_msg[x*64:(x+1)*64]
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word = []
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tmp_word = 0
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for y in range(0,int(256/4)):
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for item in tmp[y*4:(y+1)*4]:
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tmp_word = (tmp_word << 8) | item
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word.append(tmp_word)
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tmp_word = 0
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chunks.append(word)
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# process words
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for w in chunks:
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for i in range(16,64):
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s0 = ((right_rotate(w[i-15],7) ^ right_rotate(w[i-15], 18) ^ w[i-15] >> 3)) & BIT_32_MASK
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s1 = ((right_rotate(w[i-2], 17) ^ right_rotate(w[i-2], 19) ^ w[i-2] >> 10)) & BIT_32_MASK
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w[i] = (w[i-16] + s0 + w[i-7] + s1) & BIT_32_MASK
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# compression time!
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a = h0
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b = h1
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c = h2
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d = h3
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e = h4
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f = h5
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g = h6
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h = h7
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for i in range(0,64):
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s1 = right_rotate(e,6) ^ right_rotate(e,11) ^ right_rotate(e,25) & BIT_32_MASK
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ch = ((e & f) ^ ((~e) & g)) & BIT_32_MASK
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temp1 = (h + s1 + ch + k[i] + w[i]) & BIT_32_MASK
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s0 = (right_rotate(a,2) ^ right_rotate(a,13) ^ right_rotate(a,22)) & BIT_32_MASK
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maj = ((a & b) ^ (a & c) ^ (b & c)) & BIT_32_MASK
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temp2 = (s0 + maj) & BIT_32_MASK
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h = g
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g = f
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f = e
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e = (d + temp1) & BIT_32_MASK
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d = c
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c = b
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b = a
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a = (temp1 + temp2) & BIT_32_MASK
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# add compressed chunk
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h0 = (h0 + a) & BIT_32_MASK
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h1 = (h1 + b) & BIT_32_MASK
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h2 = (h2 + c) & BIT_32_MASK
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h3 = (h3 + d) & BIT_32_MASK
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h4 = (h4 + e) & BIT_32_MASK
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h5 = (h5 + f) & BIT_32_MASK
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h6 = (h6 + g) & BIT_32_MASK
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h7 = (h7 + h) & BIT_32_MASK
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# create digest
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digest = 0
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for i in [h0, h1, h2, h3, h4, h5, h6, h7]:
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digest = (digest << 32) | i
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print(hex(digest)[2:].zfill(64))
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