1 files changed, 331 insertions, 0 deletions

diff --git a/src/lib/libc/crypt/bcrypt.c b/src/lib/libc/crypt/bcrypt.c
new file mode 100644
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+++ b/src/lib/libc/crypt/bcrypt.c
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+/*      $OpenBSD: bcrypt.c,v 1.25 2012/09/04 22:16:17 tedu Exp $        */
+
+/*
+ * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Niels Provos.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/* This password hashing algorithm was designed by David Mazieres
+ * <dm@lcs.mit.edu> and works as follows:
+ *
+ * 1. state := InitState ()
+ * 2. state := ExpandKey (state, salt, password) 3.
+ * REPEAT rounds:
+ *      state := ExpandKey (state, 0, salt)
+ *      state := ExpandKey(state, 0, password)
+ * 4. ctext := "OrpheanBeholderScryDoubt"
+ * 5. REPEAT 64:
+ *      ctext := Encrypt_ECB (state, ctext);
+ * 6. RETURN Concatenate (salt, ctext);
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <string.h>
+#include <pwd.h>
+#include <blf.h>
+
+/* This implementation is adaptable to current computing power.
+ * You can have up to 2^31 rounds which should be enough for some
+ * time to come.
+ */
+
+#define BCRYPT_VERSION '2'
+#define BCRYPT_MAXSALT 16       /* Precomputation is just so nice */
+#define BCRYPT_BLOCKS 6         /* Ciphertext blocks */
+#define BCRYPT_MINROUNDS 16     /* we have log2(rounds) in salt */
+
+char   *bcrypt_gensalt(u_int8_t);
+
+static void encode_salt(char *, u_int8_t *, u_int16_t, u_int8_t);
+static void encode_base64(u_int8_t *, u_int8_t *, u_int16_t);
+static void decode_base64(u_int8_t *, u_int16_t, u_int8_t *);
+
+static char    encrypted[_PASSWORD_LEN];
+static char    gsalt[7 + (BCRYPT_MAXSALT * 4 + 2) / 3 + 1];
+static char    error[] = ":";
+
+const static u_int8_t Base64Code[] =
+"./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+
+const static u_int8_t index_64[128] = {
+        255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
+        255, 255, 255, 255, 255, 255, 0, 1, 54, 55,
+        56, 57, 58, 59, 60, 61, 62, 63, 255, 255,
+        255, 255, 255, 255, 255, 2, 3, 4, 5, 6,
+        7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
+        17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
+        255, 255, 255, 255, 255, 255, 28, 29, 30,
+        31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+        41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
+        51, 52, 53, 255, 255, 255, 255, 255
+};
+#define CHAR64(c)  ( (c) > 127 ? 255 : index_64[(c)])
+
+static void
+decode_base64(u_int8_t *buffer, u_int16_t len, u_int8_t *data)
+{
+        u_int8_t *bp = buffer;
+        u_int8_t *p = data;
+        u_int8_t c1, c2, c3, c4;
+        while (bp < buffer + len) {
+                c1 = CHAR64(*p);
+                c2 = CHAR64(*(p + 1));
+
+                /* Invalid data */
+                if (c1 == 255 || c2 == 255)
+                        break;
+
+                *bp++ = (c1 << 2) | ((c2 & 0x30) >> 4);
+                if (bp >= buffer + len)
+                        break;
+
+                c3 = CHAR64(*(p + 2));
+                if (c3 == 255)
+                        break;
+
+                *bp++ = ((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2);
+                if (bp >= buffer + len)
+                        break;
+
+                c4 = CHAR64(*(p + 3));
+                if (c4 == 255)
+                        break;
+                *bp++ = ((c3 & 0x03) << 6) | c4;
+
+                p += 4;
+        }
+}
+
+static void
+encode_salt(char *salt, u_int8_t *csalt, u_int16_t clen, u_int8_t logr)
+{
+        salt[0] = '$';
+        salt[1] = BCRYPT_VERSION;
+        salt[2] = 'a';
+        salt[3] = '$';
+
+        snprintf(salt + 4, 4, "%2.2u$", logr);
+
+        encode_base64((u_int8_t *) salt + 7, csalt, clen);
+}
+/* Generates a salt for this version of crypt.
+   Since versions may change. Keeping this here
+   seems sensible.
+ */
+
+char *
+bcrypt_gensalt(u_int8_t log_rounds)
+{
+        u_int8_t csalt[BCRYPT_MAXSALT];
+
+        arc4random_buf(csalt, sizeof(csalt));
+
+        if (log_rounds < 4)
+                log_rounds = 4;
+        else if (log_rounds > 31)
+                log_rounds = 31;
+
+        encode_salt(gsalt, csalt, BCRYPT_MAXSALT, log_rounds);
+        return gsalt;
+}
+/* We handle $Vers$log2(NumRounds)$salt+passwd$
+   i.e. $2$04$iwouldntknowwhattosayetKdJ6iFtacBqJdKe6aW7ou */
+
+char   *
+bcrypt(const char *key, const char *salt)
+{
+        blf_ctx state;
+        u_int32_t rounds, i, k;
+        u_int16_t j;
+        u_int8_t key_len, salt_len, logr, minor;
+        u_int8_t ciphertext[4 * BCRYPT_BLOCKS] = "OrpheanBeholderScryDoubt";
+        u_int8_t csalt[BCRYPT_MAXSALT];
+        u_int32_t cdata[BCRYPT_BLOCKS];
+        int n;
+
+        /* Discard "$" identifier */
+        salt++;
+
+        if (*salt > BCRYPT_VERSION) {
+                /* How do I handle errors ? Return ':' */
+                return error;
+        }
+
+        /* Check for minor versions */
+        if (salt[1] != '$') {
+                 switch (salt[1]) {
+                 case 'a':
+                         /* 'ab' should not yield the same as 'abab' */
+                         minor = salt[1];
+                         salt++;
+                         break;
+                 default:
+                         return error;
+                 }
+        } else
+                 minor = 0;
+
+        /* Discard version + "$" identifier */
+        salt += 2;
+
+        if (salt[2] != '$')
+                /* Out of sync with passwd entry */
+                return error;
+
+        /* Computer power doesn't increase linear, 2^x should be fine */
+        n = atoi(salt);
+        if (n > 31 || n < 0)
+                return error;
+        logr = (u_int8_t)n;
+        if ((rounds = (u_int32_t) 1 << logr) < BCRYPT_MINROUNDS)
+                return error;
+
+        /* Discard num rounds + "$" identifier */
+        salt += 3;
+
+        if (strlen(salt) * 3 / 4 < BCRYPT_MAXSALT)
+                return error;
+
+        /* We dont want the base64 salt but the raw data */
+        decode_base64(csalt, BCRYPT_MAXSALT, (u_int8_t *) salt);
+        salt_len = BCRYPT_MAXSALT;
+        key_len = strlen(key) + (minor >= 'a' ? 1 : 0);
+
+        /* Setting up S-Boxes and Subkeys */
+        Blowfish_initstate(&state);
+        Blowfish_expandstate(&state, csalt, salt_len,
+            (u_int8_t *) key, key_len);
+        for (k = 0; k < rounds; k++) {
+                Blowfish_expand0state(&state, (u_int8_t *) key, key_len);
+                Blowfish_expand0state(&state, csalt, salt_len);
+        }
+
+        /* This can be precomputed later */
+        j = 0;
+        for (i = 0; i < BCRYPT_BLOCKS; i++)
+                cdata[i] = Blowfish_stream2word(ciphertext, 4 * BCRYPT_BLOCKS, &j);
+
+        /* Now do the encryption */
+        for (k = 0; k < 64; k++)
+                blf_enc(&state, cdata, BCRYPT_BLOCKS / 2);
+
+        for (i = 0; i < BCRYPT_BLOCKS; i++) {
+                ciphertext[4 * i + 3] = cdata[i] & 0xff;
+                cdata[i] = cdata[i] >> 8;
+                ciphertext[4 * i + 2] = cdata[i] & 0xff;
+                cdata[i] = cdata[i] >> 8;
+                ciphertext[4 * i + 1] = cdata[i] & 0xff;
+                cdata[i] = cdata[i] >> 8;
+                ciphertext[4 * i + 0] = cdata[i] & 0xff;
+        }
+
+
+        i = 0;
+        encrypted[i++] = '$';
+        encrypted[i++] = BCRYPT_VERSION;
+        if (minor)
+                encrypted[i++] = minor;
+        encrypted[i++] = '$';
+
+        snprintf(encrypted + i, 4, "%2.2u$", logr);
+
+        encode_base64((u_int8_t *) encrypted + i + 3, csalt, BCRYPT_MAXSALT);
+        encode_base64((u_int8_t *) encrypted + strlen(encrypted), ciphertext,
+            4 * BCRYPT_BLOCKS - 1);
+        memset(&state, 0, sizeof(state));
+        memset(ciphertext, 0, sizeof(ciphertext));
+        memset(csalt, 0, sizeof(csalt));
+        memset(cdata, 0, sizeof(cdata));
+        return encrypted;
+}
+
+static void
+encode_base64(u_int8_t *buffer, u_int8_t *data, u_int16_t len)
+{
+        u_int8_t *bp = buffer;
+        u_int8_t *p = data;
+        u_int8_t c1, c2;
+        while (p < data + len) {
+                c1 = *p++;
+                *bp++ = Base64Code[(c1 >> 2)];
+                c1 = (c1 & 0x03) << 4;
+                if (p >= data + len) {
+                        *bp++ = Base64Code[c1];
+                        break;
+                }
+                c2 = *p++;
+                c1 |= (c2 >> 4) & 0x0f;
+                *bp++ = Base64Code[c1];
+                c1 = (c2 & 0x0f) << 2;
+                if (p >= data + len) {
+                        *bp++ = Base64Code[c1];
+                        break;
+                }
+                c2 = *p++;
+                c1 |= (c2 >> 6) & 0x03;
+                *bp++ = Base64Code[c1];
+                *bp++ = Base64Code[c2 & 0x3f];
+        }
+        *bp = '\0';
+}
+#if 0
+void
+main()
+{
+        char    blubber[73];
+        char    salt[100];
+        char   *p;
+        salt[0] = '$';
+        salt[1] = BCRYPT_VERSION;
+        salt[2] = '$';
+
+        snprintf(salt + 3, 4, "%2.2u$", 5);
+
+        printf("24 bytes of salt: ");
+        fgets(salt + 6, sizeof(salt) - 6, stdin);
+        salt[99] = 0;
+        printf("72 bytes of password: ");
+        fpurge(stdin);
+        fgets(blubber, sizeof(blubber), stdin);
+        blubber[72] = 0;
+
+        p = crypt(blubber, salt);
+        printf("Passwd entry: %s\n\n", p);
+
+        p = bcrypt_gensalt(5);
+        printf("Generated salt: %s\n", p);
+        p = crypt(blubber, p);
+        printf("Passwd entry: %s\n", p);
+}
+#endif