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-rw-r--r--contrib/pgcrypto/px-crypt.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/contrib/pgcrypto/px-crypt.c b/contrib/pgcrypto/px-crypt.c
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+/*
+ * px-crypt.c
+ * Wrapper for various crypt algorithms.
+ *
+ * Copyright (c) 2001 Marko Kreen
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * contrib/pgcrypto/px-crypt.c
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "px-crypt.h"
+
+
+static char *
+run_crypt_des(const char *psw, const char *salt,
+ char *buf, unsigned len)
+{
+ char *res;
+
+ res = px_crypt_des(psw, salt);
+ if (res == NULL || strlen(res) > len - 1)
+ return NULL;
+ strcpy(buf, res);
+ return buf;
+}
+
+static char *
+run_crypt_md5(const char *psw, const char *salt,
+ char *buf, unsigned len)
+{
+ char *res;
+
+ res = px_crypt_md5(psw, salt, buf, len);
+ return res;
+}
+
+static char *
+run_crypt_bf(const char *psw, const char *salt,
+ char *buf, unsigned len)
+{
+ char *res;
+
+ res = _crypt_blowfish_rn(psw, salt, buf, len);
+ return res;
+}
+
+struct px_crypt_algo
+{
+ char *id;
+ unsigned id_len;
+ char *(*crypt) (const char *psw, const char *salt,
+ char *buf, unsigned len);
+};
+
+static const struct px_crypt_algo
+ px_crypt_list[] = {
+ {"$2a$", 4, run_crypt_bf},
+ {"$2x$", 4, run_crypt_bf},
+ {"$2$", 3, NULL}, /* N/A */
+ {"$1$", 3, run_crypt_md5},
+ {"_", 1, run_crypt_des},
+ {"", 0, run_crypt_des},
+ {NULL, 0, NULL}
+};
+
+char *
+px_crypt(const char *psw, const char *salt, char *buf, unsigned len)
+{
+ const struct px_crypt_algo *c;
+
+ for (c = px_crypt_list; c->id; c++)
+ {
+ if (!c->id_len)
+ break;
+ if (strncmp(salt, c->id, c->id_len) == 0)
+ break;
+ }
+
+ if (c->crypt == NULL)
+ return NULL;
+
+ return c->crypt(psw, salt, buf, len);
+}
+
+/*
+ * salt generators
+ */
+
+struct generator
+{
+ char *name;
+ char *(*gen) (unsigned long count, const char *input, int size,
+ char *output, int output_size);
+ int input_len;
+ int def_rounds;
+ int min_rounds;
+ int max_rounds;
+};
+
+static struct generator gen_list[] = {
+ {"des", _crypt_gensalt_traditional_rn, 2, 0, 0, 0},
+ {"md5", _crypt_gensalt_md5_rn, 6, 0, 0, 0},
+ {"xdes", _crypt_gensalt_extended_rn, 3, PX_XDES_ROUNDS, 1, 0xFFFFFF},
+ {"bf", _crypt_gensalt_blowfish_rn, 16, PX_BF_ROUNDS, 4, 31},
+ {NULL, NULL, 0, 0, 0, 0}
+};
+
+int
+px_gen_salt(const char *salt_type, char *buf, int rounds)
+{
+ struct generator *g;
+ char *p;
+ char rbuf[16];
+
+ for (g = gen_list; g->name; g++)
+ if (pg_strcasecmp(g->name, salt_type) == 0)
+ break;
+
+ if (g->name == NULL)
+ return PXE_UNKNOWN_SALT_ALGO;
+
+ if (g->def_rounds)
+ {
+ if (rounds == 0)
+ rounds = g->def_rounds;
+
+ if (rounds < g->min_rounds || rounds > g->max_rounds)
+ return PXE_BAD_SALT_ROUNDS;
+ }
+
+ if (!pg_strong_random(rbuf, g->input_len))
+ return PXE_NO_RANDOM;
+
+ p = g->gen(rounds, rbuf, g->input_len, buf, PX_MAX_SALT_LEN);
+ px_memset(rbuf, 0, sizeof(rbuf));
+
+ if (p == NULL)
+ return PXE_BAD_SALT_ROUNDS;
+
+ return strlen(p);
+}