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-rw-r--r--lib/libc/src/crypto/sha256.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/lib/libc/src/crypto/sha256.c b/lib/libc/src/crypto/sha256.c
new file mode 100644
index 0000000..c722026
--- /dev/null
+++ b/lib/libc/src/crypto/sha256.c
@@ -0,0 +1,242 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <crypto/sha256.h>
+#include <stdint.h>
+#include <stddef.h>
+
+static inline uint32_t
+rotr(uint32_t x, int n)
+{
+ return (x >> n) | (x << (32 - n));
+}
+
+static inline uint32_t
+step1(uint32_t e, uint32_t f, uint32_t g)
+{
+ return (rotr(e, 6) ^ rotr(e, 11) ^ rotr(e, 25)) + ((e & f) ^ ((~ e) & g));
+}
+
+static inline uint32_t
+step2(uint32_t a, uint32_t b, uint32_t c)
+{
+ return (rotr(a, 2) ^ rotr(a, 13) ^ rotr(a, 22)) + ((a & b) ^ (a & c) ^ (b & c));
+}
+
+static inline void
+update_w(uint32_t *w, int i, const uint8_t *buffer)
+{
+ int j;
+ for (j = 0; j < 16; j++) {
+ if (i < 16){
+ w[j] =
+ ((uint32_t)buffer[0] << 24) |
+ ((uint32_t)buffer[1] << 16) |
+ ((uint32_t)buffer[2] << 8) |
+ ((uint32_t)buffer[3]);
+ buffer += 4;
+ }else {
+ uint32_t a = w[(j + 1) & 15];
+ uint32_t b = w[(j + 14) & 15];
+ uint32_t s0 = (rotr(a, 7) ^ rotr(a, 18) ^ (a >> 3));
+ uint32_t s1 = (rotr(b, 17) ^ rotr(b, 19) ^ (b >> 10));
+ w[j] += w[(j + 9) & 15] + s0 + s1;
+ }
+ }
+}
+
+static void
+sha256_block(struct sha256 *sha)
+{
+ uint32_t *state = sha->state;
+
+ static const uint32_t k[8 * 8] = {
+ 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,
+ };
+
+ uint32_t a = state[0];
+ uint32_t b = state[1];
+ uint32_t c = state[2];
+ uint32_t d = state[3];
+ uint32_t e = state[4];
+ uint32_t f = state[5];
+ uint32_t g = state[6];
+ uint32_t h = state[7];
+
+ uint32_t w[16];
+
+ int i, j;
+ for (i = 0; i < 64; i += 16) {
+ update_w(w, i, sha->buffer);
+
+ for (j = 0; j < 16; j += 4) {
+ uint32_t temp;
+ temp = h + step1(e, f, g) + k[i + j + 0] + w[j + 0];
+ h = temp + d;
+ d = temp + step2(a, b, c);
+ temp = g + step1(h, e, f) + k[i + j + 1] + w[j + 1];
+ g = temp + c;
+ c = temp + step2(d, a, b);
+ temp = f + step1(g, h, e) + k[i + j + 2] + w[j + 2];
+ f = temp + b;
+ b = temp + step2(c, d, a);
+ temp = e + step1(f, g, h) + k[i + j + 3] + w[j + 3];
+ e = temp + a;
+ a = temp + step2(b, c, d);
+ }
+ }
+
+ state[0] += a;
+ state[1] += b;
+ state[2] += c;
+ state[3] += d;
+ state[4] += e;
+ state[5] += f;
+ state[6] += g;
+ state[7] += h;
+}
+
+void
+sha256_init(struct sha256 *sha)
+{
+ sha->state[0] = 0x6a09e667;
+ sha->state[1] = 0xbb67ae85;
+ sha->state[2] = 0x3c6ef372;
+ sha->state[3] = 0xa54ff53a;
+ sha->state[4] = 0x510e527f;
+ sha->state[5] = 0x9b05688c;
+ sha->state[6] = 0x1f83d9ab;
+ sha->state[7] = 0x5be0cd19;
+ sha->n_bits = 0;
+ sha->buffer_counter = 0;
+}
+
+void
+sha256_append_byte(struct sha256 *sha, uint8_t byte)
+{
+ sha->buffer[sha->buffer_counter++] = byte;
+ sha->n_bits += 8;
+
+ if (sha->buffer_counter == 64) {
+ sha->buffer_counter = 0;
+ sha256_block(sha);
+ }
+}
+
+void
+sha256_append(struct sha256 *sha, const void *src, size_t n_bytes)
+{
+ const uint8_t *bytes = (const uint8_t*)src;
+ size_t i;
+
+ for (i = 0; i < n_bytes; i++) {
+ sha256_append_byte(sha, bytes[i]);
+ }
+}
+
+void
+sha256_finalize(struct sha256 *sha)
+{
+ int i;
+ uint64_t n_bits = sha->n_bits;
+
+ sha256_append_byte(sha, 0x80);
+
+ while (sha->buffer_counter != 56) {
+ sha256_append_byte(sha, 0);
+ }
+
+ for (i = 7; i >= 0; i--) {
+ uint8_t byte = (n_bits >> 8 * i) & 0xff;
+ sha256_append_byte(sha, byte);
+ }
+}
+
+void
+sha256_finalize_hex(struct sha256 *sha, char *dst_hex65)
+{
+ int i, j;
+ sha256_finalize(sha);
+
+ for (i = 0; i < 8; i++) {
+ for (j = 7; j >= 0; j--) {
+ uint8_t nibble = (sha->state[i] >> j * 4) & 0xf;
+ *dst_hex65++ = "0123456789abcdef"[nibble];
+ }
+ }
+
+ *dst_hex65 = '\0';
+}
+
+void
+sha256_finalize_bytes(struct sha256 *sha, void *dst_bytes32)
+{
+ uint8_t *ptr = (uint8_t*)dst_bytes32;
+ int i, j;
+ sha256_finalize(sha);
+
+ for (i = 0; i < 8; i++) {
+ for (j = 3; j >= 0; j--) {
+ *ptr++ = (sha->state[i] >> j * 8) & 0xff;
+ }
+ }
+}
+
+void
+sha256_hex(const void *src, size_t n_bytes, char *dst_hex65)
+{
+ struct sha256 sha;
+
+ sha256_init(&sha);
+ sha256_append(&sha, src, n_bytes);
+ sha256_finalize_hex(&sha, dst_hex65);
+}
+
+void sha256_bytes(const void *src, size_t n_bytes, void *dst_bytes32){
+ struct sha256 sha;
+
+ sha256_init(&sha);
+ sha256_append(&sha, src, n_bytes);
+ sha256_finalize_bytes(&sha, dst_bytes32);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-12 13:25:17 +0000