lib: add sha256 implementation

Based on src/crypt/crypt_sha256.c from musl  v1.2.3[0]

https://musl.libc.org/releases/musl-1.2.3.tar.gz

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>

diff --git a/include/Makemodule.am b/include/Makemodule.am
index 7e944b2a451005d4d924a6e41ccde82ae1cabc62..cbe5fc83cae6301fd94906b7034b8e5fa15ed83e 100644 (file)
--- a/include/Makemodule.am
+++ b/include/Makemodule.am
@@ -60,6 +60,7 @@ dist_noinst_HEADERS += \
        include/randutils.h \
        include/rpmatch.h \
        include/sha1.h \
+       include/sha256.h \
        include/signames.h \
        include/selinux-utils.h \
        include/statfs_magic.h \

diff --git a/include/sha256.h b/include/sha256.h
new file mode 100644 (file)
index 0000000..dcde8fb
--- /dev/null
+++ b/include/sha256.h
@@ -0,0 +1,10 @@
+#ifndef UTIL_LINUX_SHA256_H
+#define UTIL_LINUX_SHA256_H
+
+#include <stddef.h>
+
+#define UL_SHA256LENGTH                32
+
+extern void ul_SHA256(unsigned char hash_out[UL_SHA256LENGTH], const unsigned char *str, size_t len);
+
+#endif /* UTIL_LINUX_SHA256_H */

diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index 2856f834d213fee356bcb599783a77738c3c66ac..5cf4e87dc3307146384dabb656726b4fa4c7a461 100644 (file)
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -33,6 +33,7 @@ libcommon_la_SOURCES = \
        lib/pwdutils.c \
        lib/randutils.c \
        lib/sha1.c \
+       lib/sha256.c \
        lib/signames.c \
        lib/strutils.c \
        lib/strv.c \

diff --git a/lib/meson.build b/lib/meson.build
index 21165b3c1a1ec26d3050d34c3305db3c43c661ab..b5f11c56815d6042d274dac34b1cd8e8c98477f6 100644 (file)
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -21,6 +21,7 @@ lib_common_sources = '''
        pwdutils.c
        randutils.c
        sha1.c
+       sha256.c
        signames.c
        strutils.c
        strv.c

diff --git a/lib/sha256.c b/lib/sha256.c
new file mode 100644 (file)
index 0000000..934303c
--- /dev/null
+++ b/lib/sha256.c
@@ -0,0 +1,163 @@
+/*
+ * public domain sha256 crypt implementation
+ *
+ * original sha crypt design: http://people.redhat.com/drepper/SHA-crypt.txt
+ * in this implementation at least 32bit int is assumed,
+ * key length is limited, the $5$ prefix is mandatory, '\n' and ':' is rejected
+ * in the salt and rounds= setting must contain a valid iteration count,
+ * on error "*" is returned.
+ */
+#include <ctype.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "sha256.h"
+
+/* public domain sha256 implementation based on fips180-3 */
+
+struct sha256 {
+       uint64_t len;    /* processed message length */
+       uint32_t h[8];   /* hash state */
+       uint8_t buf[64]; /* message block buffer */
+};
+
+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);
+}
+
+static void sha256_init(struct sha256 *s)
+{
+       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;
+}
+
+static void sha256_sum(struct sha256 *s, uint8_t *md)
+{
+       int i;
+
+       pad(s);
+       for (i = 0; i < 8; 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];
+       }
+}
+
+static void sha256_update(struct sha256 *s, const void *m, unsigned long len)
+{
+       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);
+}
+
+void ul_SHA256(unsigned char hash_out[UL_SHA256LENGTH], const unsigned char *str, size_t len) {
+       struct sha256 state = {};
+       sha256_init(&state);
+       sha256_update(&state, str, len);
+       sha256_sum(&state, hash_out);
+}