commit: 7b875dcbdae6e2d7f91c50f787195f88fef27e90
parent f953da60aab6fdc6c05a764001e84f68cd65fbed
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date: Sat, 14 Sep 2024 05:14:38 +0200
lib/sha256.*: import from suckless sbase
Diffstat:
| A | lib/sha256.c | 164 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | lib/sha256.h | 24 | ++++++++++++++++++++++++ |
2 files changed, 188 insertions(+), 0 deletions(-)
diff --git a/lib/sha256.c b/lib/sha256.c
@@ -0,0 +1,164 @@
+// public domain sha256 implementation based on fips180-3
+// SPDX-License-Identifier: 0BSD
+#include "sha256.h"
+
+#include <ctype.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static uint32_t
+ror(uint32_t n, int k)
+{
+ return (n >> k) | (n << (32 - k));
+}
+#define Ch(x, y, z) (z ^ (x & (y ^ z)))
+#define Maj(x, y, z) ((x & y) | (z & (x | y)))
+#define S0(x) (ror(x, 2) ^ ror(x, 13) ^ ror(x, 22))
+#define S1(x) (ror(x, 6) ^ ror(x, 11) ^ ror(x, 25))
+#define R0(x) (ror(x, 7) ^ ror(x, 18) ^ (x >> 3))
+#define R1(x) (ror(x, 17) ^ ror(x, 19) ^ (x >> 10))
+
+static const uint32_t K[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};
+
+static void
+processblock(struct sha256 *s, const uint8_t *buf)
+{
+ uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h;
+ int i;
+
+ for(i = 0; i < 16; i++)
+ {
+ W[i] = (uint32_t)buf[4 * i] << 24;
+ W[i] |= (uint32_t)buf[4 * i + 1] << 16;
+ W[i] |= (uint32_t)buf[4 * i + 2] << 8;
+ W[i] |= buf[4 * i + 3];
+ }
+ for(; i < 64; i++)
+ W[i] = R1(W[i - 2]) + W[i - 7] + R0(W[i - 15]) + W[i - 16];
+ a = s->h[0];
+ b = s->h[1];
+ c = s->h[2];
+ d = s->h[3];
+ e = s->h[4];
+ f = s->h[5];
+ g = s->h[6];
+ h = s->h[7];
+ for(i = 0; i < 64; i++)
+ {
+ t1 = h + S1(e) + Ch(e, f, g) + K[i] + W[i];
+ t2 = S0(a) + Maj(a, b, c);
+ h = g;
+ g = f;
+ f = e;
+ e = d + t1;
+ d = c;
+ c = b;
+ b = a;
+ a = t1 + t2;
+ }
+ s->h[0] += a;
+ s->h[1] += b;
+ s->h[2] += c;
+ s->h[3] += d;
+ s->h[4] += e;
+ s->h[5] += f;
+ s->h[6] += g;
+ s->h[7] += h;
+}
+
+static void
+pad(struct sha256 *s)
+{
+ unsigned r = s->len % 64;
+
+ s->buf[r++] = 0x80;
+ if(r > 56)
+ {
+ memset(s->buf + r, 0, 64 - r);
+ r = 0;
+ processblock(s, s->buf);
+ }
+ memset(s->buf + r, 0, 56 - r);
+ s->len *= 8;
+ s->buf[56] = s->len >> 56;
+ s->buf[57] = s->len >> 48;
+ s->buf[58] = s->len >> 40;
+ s->buf[59] = s->len >> 32;
+ s->buf[60] = s->len >> 24;
+ s->buf[61] = s->len >> 16;
+ s->buf[62] = s->len >> 8;
+ s->buf[63] = s->len;
+ processblock(s, s->buf);
+}
+
+void
+sha256_init(void *ctx)
+{
+ struct sha256 *s = ctx;
+ s->len = 0;
+ s->h[0] = 0x6a09e667;
+ s->h[1] = 0xbb67ae85;
+ s->h[2] = 0x3c6ef372;
+ s->h[3] = 0xa54ff53a;
+ s->h[4] = 0x510e527f;
+ s->h[5] = 0x9b05688c;
+ s->h[6] = 0x1f83d9ab;
+ s->h[7] = 0x5be0cd19;
+}
+
+void
+sha256_sum_n(void *ctx, uint8_t *md, int n)
+{
+ struct sha256 *s = ctx;
+ int i;
+
+ pad(s);
+ for(i = 0; i < n; i++)
+ {
+ md[4 * i] = s->h[i] >> 24;
+ md[4 * i + 1] = s->h[i] >> 16;
+ md[4 * i + 2] = s->h[i] >> 8;
+ md[4 * i + 3] = s->h[i];
+ }
+}
+
+void
+sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH])
+{
+ sha256_sum_n(ctx, md, 8);
+}
+
+void
+sha256_update(void *ctx, const void *m, unsigned long len)
+{
+ struct sha256 *s = ctx;
+ const uint8_t *p = m;
+ unsigned r = s->len % 64;
+
+ s->len += len;
+ if(r)
+ {
+ if(len < 64 - r)
+ {
+ memcpy(s->buf + r, p, len);
+ return;
+ }
+ memcpy(s->buf + r, p, 64 - r);
+ len -= 64 - r;
+ p += 64 - r;
+ processblock(s, s->buf);
+ }
+ for(; len >= 64; len -= 64, p += 64)
+ processblock(s, p);
+ memcpy(s->buf, p, len);
+}
diff --git a/lib/sha256.h b/lib/sha256.h
@@ -0,0 +1,24 @@
+// public domain sha256 implementation based on fips180-3
+// SPDX-License-Identifier: 0BSD
+#include <stdint.h>
+
+struct sha256
+{
+ uint64_t len; /* processed message length */
+ uint32_t h[8]; /* hash state */
+ uint8_t buf[64]; /* message block buffer */
+};
+
+enum
+{
+ SHA256_DIGEST_LENGTH = 32
+};
+
+/* reset state */
+void sha256_init(void *ctx);
+/* process message */
+void sha256_update(void *ctx, const void *m, unsigned long len);
+/* get message digest */
+/* state is ruined after sum, keep a copy if multiple sum is needed */
+/* part of the message might be left in s, zero it if secrecy is needed */
+void sha256_sum(void *ctx, uint8_t md[SHA256_DIGEST_LENGTH]);
