npm

commit c5ef611854a707845139c01abf89d5a31182415c
parent bf32715b6fefc3b2850477dc47432ae160cb030d
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Mon, 15 Mar 2021 19:30:57 -0500

add sha1.* from sbase

Diffstat:
A
sha1.c
 | 
144
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
sha1.h
 | 
18
++++++++++++++++++

2 files changed, 162 insertions(+), 0 deletions(-)
diff --git a/sha1.c b/sha1.c
@@ -0,0 +1,144 @@
+/* public domain sha1 implementation based on rfc3174 and libtomcrypt */
+#include <stdint.h>
+#include <string.h>
+
+#include "../sha1.h"
+
+static uint32_t rol(uint32_t n, int k) { return (n << k) | (n >> (32-k)); }
+#define F0(b,c,d) (d ^ (b & (c ^ d)))
+#define F1(b,c,d) (b ^ c ^ d)
+#define F2(b,c,d) ((b & c) | (d & (b | c)))
+#define F3(b,c,d) (b ^ c ^ d)
+#define G0(a,b,c,d,e,i) e += rol(a,5)+F0(b,c,d)+W[i]+0x5A827999; b = rol(b,30)
+#define G1(a,b,c,d,e,i) e += rol(a,5)+F1(b,c,d)+W[i]+0x6ED9EBA1; b = rol(b,30)
+#define G2(a,b,c,d,e,i) e += rol(a,5)+F2(b,c,d)+W[i]+0x8F1BBCDC; b = rol(b,30)
+#define G3(a,b,c,d,e,i) e += rol(a,5)+F3(b,c,d)+W[i]+0xCA62C1D6; b = rol(b,30)
+
+static void
+processblock(struct sha1 *s, const uint8_t *buf)
+{
+	uint32_t W[80], a, b, c, d, e;
+	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 < 80; i++)
+		W[i] = rol(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
+	a = s->h[0];
+	b = s->h[1];
+	c = s->h[2];
+	d = s->h[3];
+	e = s->h[4];
+	for (i = 0; i < 20; ) {
+		G0(a,b,c,d,e,i++);
+		G0(e,a,b,c,d,i++);
+		G0(d,e,a,b,c,i++);
+		G0(c,d,e,a,b,i++);
+		G0(b,c,d,e,a,i++);
+	}
+	while (i < 40) {
+		G1(a,b,c,d,e,i++);
+		G1(e,a,b,c,d,i++);
+		G1(d,e,a,b,c,i++);
+		G1(c,d,e,a,b,i++);
+		G1(b,c,d,e,a,i++);
+	}
+	while (i < 60) {
+		G2(a,b,c,d,e,i++);
+		G2(e,a,b,c,d,i++);
+		G2(d,e,a,b,c,i++);
+		G2(c,d,e,a,b,i++);
+		G2(b,c,d,e,a,i++);
+	}
+	while (i < 80) {
+		G3(a,b,c,d,e,i++);
+		G3(e,a,b,c,d,i++);
+		G3(d,e,a,b,c,i++);
+		G3(c,d,e,a,b,i++);
+		G3(b,c,d,e,a,i++);
+	}
+	s->h[0] += a;
+	s->h[1] += b;
+	s->h[2] += c;
+	s->h[3] += d;
+	s->h[4] += e;
+}
+
+static void
+pad(struct sha1 *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
+sha1_init(void *ctx)
+{
+	struct sha1 *s = ctx;
+
+	s->len = 0;
+	s->h[0] = 0x67452301;
+	s->h[1] = 0xEFCDAB89;
+	s->h[2] = 0x98BADCFE;
+	s->h[3] = 0x10325476;
+	s->h[4] = 0xC3D2E1F0;
+}
+
+void
+sha1_sum(void *ctx, uint8_t md[SHA1_DIGEST_LENGTH])
+{
+	struct sha1 *s = ctx;
+	int i;
+
+	pad(s);
+	for (i = 0; i < 5; 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
+sha1_update(void *ctx, const void *m, unsigned long len)
+{
+	struct sha1 *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/sha1.h b/sha1.h
@@ -0,0 +1,18 @@
+/* public domain sha1 implementation based on rfc3174 and libtomcrypt */
+
+struct sha1 {
+	uint64_t len;    /* processed message length */
+	uint32_t h[5];   /* hash state */
+	uint8_t buf[64]; /* message block buffer */
+};
+
+enum { SHA1_DIGEST_LENGTH = 20 };
+
+/* reset state */
+void sha1_init(void *ctx);
+/* process message */
+void sha1_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 sha1_sum(void *ctx, uint8_t md[SHA1_DIGEST_LENGTH]);