summaryrefslogtreecommitdiffstats
path: root/contrib/pgcrypto/crypt-md5.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--contrib/pgcrypto/crypt-md5.c169
1 files changed, 169 insertions, 0 deletions
diff --git a/contrib/pgcrypto/crypt-md5.c b/contrib/pgcrypto/crypt-md5.c
new file mode 100644
index 0000000..d38721a
--- /dev/null
+++ b/contrib/pgcrypto/crypt-md5.c
@@ -0,0 +1,169 @@
+/*
+ * File imported from FreeBSD, original by Poul-Henning Kamp.
+ *
+ * $FreeBSD: src/lib/libcrypt/crypt-md5.c,v 1.5 1999/12/17 20:21:45 peter Exp $
+ *
+ * contrib/pgcrypto/crypt-md5.c
+ */
+
+#include "postgres.h"
+
+#include "px-crypt.h"
+#include "px.h"
+
+#define MD5_SIZE 16
+
+static const char _crypt_a64[] =
+"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+static void
+_crypt_to64(char *s, unsigned long v, int n)
+{
+ while (--n >= 0)
+ {
+ *s++ = _crypt_a64[v & 0x3f];
+ v >>= 6;
+ }
+}
+
+/*
+ * UNIX password
+ */
+
+char *
+px_crypt_md5(const char *pw, const char *salt, char *passwd, unsigned dstlen)
+{
+ static char *magic = "$1$"; /* This string is magic for this algorithm.
+ * Having it this way, we can get better later
+ * on */
+ static char *p;
+ static const char *sp,
+ *ep;
+ unsigned char final[MD5_SIZE];
+ int sl,
+ pl,
+ i;
+ PX_MD *ctx,
+ *ctx1;
+ int err;
+ unsigned long l;
+
+ if (!passwd || dstlen < 120)
+ return NULL;
+
+ /* Refine the Salt first */
+ sp = salt;
+
+ /* If it starts with the magic string, then skip that */
+ if (strncmp(sp, magic, strlen(magic)) == 0)
+ sp += strlen(magic);
+
+ /* It stops at the first '$', max 8 chars */
+ for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
+ continue;
+
+ /* get the length of the true salt */
+ sl = ep - sp;
+
+ /* we need two PX_MD objects */
+ err = px_find_digest("md5", &ctx);
+ if (err)
+ return NULL;
+ err = px_find_digest("md5", &ctx1);
+ if (err)
+ {
+ /* this path is possible under low-memory circumstances */
+ px_md_free(ctx);
+ return NULL;
+ }
+
+ /* The password first, since that is what is most unknown */
+ px_md_update(ctx, (const uint8 *) pw, strlen(pw));
+
+ /* Then our magic string */
+ px_md_update(ctx, (uint8 *) magic, strlen(magic));
+
+ /* Then the raw salt */
+ px_md_update(ctx, (const uint8 *) sp, sl);
+
+ /* Then just as many characters of the MD5(pw,salt,pw) */
+ px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
+ px_md_update(ctx1, (const uint8 *) sp, sl);
+ px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
+ px_md_finish(ctx1, final);
+ for (pl = strlen(pw); pl > 0; pl -= MD5_SIZE)
+ px_md_update(ctx, final, pl > MD5_SIZE ? MD5_SIZE : pl);
+
+ /* Don't leave anything around in vm they could use. */
+ px_memset(final, 0, sizeof final);
+
+ /* Then something really weird... */
+ for (i = strlen(pw); i; i >>= 1)
+ if (i & 1)
+ px_md_update(ctx, final, 1);
+ else
+ px_md_update(ctx, (const uint8 *) pw, 1);
+
+ /* Now make the output string */
+ strcpy(passwd, magic);
+ strncat(passwd, sp, sl);
+ strcat(passwd, "$");
+
+ px_md_finish(ctx, final);
+
+ /*
+ * and now, just to make sure things don't run too fast On a 60 Mhz
+ * Pentium this takes 34 msec, so you would need 30 seconds to build a
+ * 1000 entry dictionary...
+ */
+ for (i = 0; i < 1000; i++)
+ {
+ px_md_reset(ctx1);
+ if (i & 1)
+ px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
+ else
+ px_md_update(ctx1, final, MD5_SIZE);
+
+ if (i % 3)
+ px_md_update(ctx1, (const uint8 *) sp, sl);
+
+ if (i % 7)
+ px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
+
+ if (i & 1)
+ px_md_update(ctx1, final, MD5_SIZE);
+ else
+ px_md_update(ctx1, (const uint8 *) pw, strlen(pw));
+ px_md_finish(ctx1, final);
+ }
+
+ p = passwd + strlen(passwd);
+
+ l = (final[0] << 16) | (final[6] << 8) | final[12];
+ _crypt_to64(p, l, 4);
+ p += 4;
+ l = (final[1] << 16) | (final[7] << 8) | final[13];
+ _crypt_to64(p, l, 4);
+ p += 4;
+ l = (final[2] << 16) | (final[8] << 8) | final[14];
+ _crypt_to64(p, l, 4);
+ p += 4;
+ l = (final[3] << 16) | (final[9] << 8) | final[15];
+ _crypt_to64(p, l, 4);
+ p += 4;
+ l = (final[4] << 16) | (final[10] << 8) | final[5];
+ _crypt_to64(p, l, 4);
+ p += 4;
+ l = final[11];
+ _crypt_to64(p, l, 2);
+ p += 2;
+ *p = '\0';
+
+ /* Don't leave anything around in vm they could use. */
+ px_memset(final, 0, sizeof final);
+
+ px_md_free(ctx1);
+ px_md_free(ctx);
+
+ return passwd;
+}