1 files changed, 341 insertions, 0 deletions
diff --git a/contrib/pgcrypto/px.c b/contrib/pgcrypto/px.c
new file mode 100644
index 0000000..3b098c6
--- /dev/null
+++ b/contrib/pgcrypto/px.c
@@ -0,0 +1,341 @@
+/*
+ * px.c
+ *		Various cryptographic stuff for PostgreSQL.
+ *
+ * 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.c
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+
+struct error_desc
+{
+	int			err;
+	const char *desc;
+};
+
+static const struct error_desc px_err_list[] = {
+	{PXE_OK, "Everything ok"},
+	{PXE_NO_HASH, "No such hash algorithm"},
+	{PXE_NO_CIPHER, "No such cipher algorithm"},
+	{PXE_BAD_OPTION, "Unknown option"},
+	{PXE_BAD_FORMAT, "Badly formatted type"},
+	{PXE_KEY_TOO_BIG, "Key was too big"},
+	{PXE_CIPHER_INIT, "Cipher cannot be initialized"},
+	{PXE_HASH_UNUSABLE_FOR_HMAC, "This hash algorithm is unusable for HMAC"},
+	{PXE_BUG, "pgcrypto bug"},
+	{PXE_ARGUMENT_ERROR, "Illegal argument to function"},
+	{PXE_UNKNOWN_SALT_ALGO, "Unknown salt algorithm"},
+	{PXE_BAD_SALT_ROUNDS, "Incorrect number of rounds"},
+	{PXE_NO_RANDOM, "Failed to generate strong random bits"},
+	{PXE_DECRYPT_FAILED, "Decryption failed"},
+	{PXE_ENCRYPT_FAILED, "Encryption failed"},
+	{PXE_PGP_CORRUPT_DATA, "Wrong key or corrupt data"},
+	{PXE_PGP_CORRUPT_ARMOR, "Corrupt ascii-armor"},
+	{PXE_PGP_UNSUPPORTED_COMPR, "Unsupported compression algorithm"},
+	{PXE_PGP_UNSUPPORTED_CIPHER, "Unsupported cipher algorithm"},
+	{PXE_PGP_UNSUPPORTED_HASH, "Unsupported digest algorithm"},
+	{PXE_PGP_COMPRESSION_ERROR, "Compression error"},
+	{PXE_PGP_NOT_TEXT, "Not text data"},
+	{PXE_PGP_UNEXPECTED_PKT, "Unexpected packet in key data"},
+	{PXE_PGP_MATH_FAILED, "Math operation failed"},
+	{PXE_PGP_SHORT_ELGAMAL_KEY, "Elgamal keys must be at least 1024 bits long"},
+	{PXE_PGP_UNKNOWN_PUBALGO, "Unknown public-key encryption algorithm"},
+	{PXE_PGP_WRONG_KEY, "Wrong key"},
+	{PXE_PGP_MULTIPLE_KEYS,
+	"Several keys given - pgcrypto does not handle keyring"},
+	{PXE_PGP_EXPECT_PUBLIC_KEY, "Refusing to encrypt with secret key"},
+	{PXE_PGP_EXPECT_SECRET_KEY, "Cannot decrypt with public key"},
+	{PXE_PGP_NOT_V4_KEYPKT, "Only V4 key packets are supported"},
+	{PXE_PGP_KEYPKT_CORRUPT, "Corrupt key packet"},
+	{PXE_PGP_NO_USABLE_KEY, "No encryption key found"},
+	{PXE_PGP_NEED_SECRET_PSW, "Need password for secret key"},
+	{PXE_PGP_BAD_S2K_MODE, "Bad S2K mode"},
+	{PXE_PGP_UNSUPPORTED_PUBALGO, "Unsupported public key algorithm"},
+	{PXE_PGP_MULTIPLE_SUBKEYS, "Several subkeys not supported"},
+
+	{0, NULL},
+};
+
+/*
+ * Call ereport(ERROR, ...), with an error code and message corresponding to
+ * the PXE_* error code given as argument.
+ *
+ * This is similar to px_strerror(err), but for some errors, we fill in the
+ * error code and detail fields more appropriately.
+ */
+void
+px_THROW_ERROR(int err)
+{
+	if (err == PXE_NO_RANDOM)
+	{
+		ereport(ERROR,
+				(errcode(ERRCODE_INTERNAL_ERROR),
+				 errmsg("could not generate a random number")));
+	}
+	else
+	{
+		/* For other errors, use the message from the above list. */
+		ereport(ERROR,
+				(errcode(ERRCODE_EXTERNAL_ROUTINE_INVOCATION_EXCEPTION),
+				 errmsg("%s", px_strerror(err))));
+	}
+}
+
+const char *
+px_strerror(int err)
+{
+	const struct error_desc *e;
+
+	for (e = px_err_list; e->desc; e++)
+		if (e->err == err)
+			return e->desc;
+	return "Bad error code";
+}
+
+/* memset that must not be optimized away */
+void
+px_memset(void *ptr, int c, size_t len)
+{
+	memset(ptr, c, len);
+}
+
+const char *
+px_resolve_alias(const PX_Alias *list, const char *name)
+{
+	while (list->name)
+	{
+		if (pg_strcasecmp(list->alias, name) == 0)
+			return list->name;
+		list++;
+	}
+	return name;
+}
+
+static void (*debug_handler) (const char *) = NULL;
+
+void
+px_set_debug_handler(void (*handler) (const char *))
+{
+	debug_handler = handler;
+}
+
+void
+px_debug(const char *fmt,...)
+{
+	va_list		ap;
+
+	va_start(ap, fmt);
+	if (debug_handler)
+	{
+		char		buf[512];
+
+		vsnprintf(buf, sizeof(buf), fmt, ap);
+		debug_handler(buf);
+	}
+	va_end(ap);
+}
+
+/*
+ * combo - cipher + padding (+ checksum)
+ */
+
+static unsigned
+combo_encrypt_len(PX_Combo *cx, unsigned dlen)
+{
+	return dlen + 512;
+}
+
+static unsigned
+combo_decrypt_len(PX_Combo *cx, unsigned dlen)
+{
+	return dlen;
+}
+
+static int
+combo_init(PX_Combo *cx, const uint8 *key, unsigned klen,
+		   const uint8 *iv, unsigned ivlen)
+{
+	int			err;
+	unsigned	ks,
+				ivs;
+	PX_Cipher  *c = cx->cipher;
+	uint8	   *ivbuf = NULL;
+	uint8	   *keybuf;
+
+	ks = px_cipher_key_size(c);
+
+	ivs = px_cipher_iv_size(c);
+	if (ivs > 0)
+	{
+		ivbuf = palloc0(ivs);
+		if (ivlen > ivs)
+			memcpy(ivbuf, iv, ivs);
+		else if (ivlen > 0)
+			memcpy(ivbuf, iv, ivlen);
+	}
+
+	if (klen > ks)
+		klen = ks;
+	keybuf = palloc0(ks);
+	memset(keybuf, 0, ks);
+	memcpy(keybuf, key, klen);
+
+	err = px_cipher_init(c, keybuf, klen, ivbuf);
+
+	if (ivbuf)
+		pfree(ivbuf);
+	pfree(keybuf);
+
+	return err;
+}
+
+static int
+combo_encrypt(PX_Combo *cx, const uint8 *data, unsigned dlen,
+			  uint8 *res, unsigned *rlen)
+{
+	return px_cipher_encrypt(cx->cipher, cx->padding, data, dlen, res, rlen);
+}
+
+static int
+combo_decrypt(PX_Combo *cx, const uint8 *data, unsigned dlen,
+			  uint8 *res, unsigned *rlen)
+{
+	return px_cipher_decrypt(cx->cipher, cx->padding, data, dlen, res, rlen);
+}
+
+static void
+combo_free(PX_Combo *cx)
+{
+	if (cx->cipher)
+		px_cipher_free(cx->cipher);
+	px_memset(cx, 0, sizeof(*cx));
+	pfree(cx);
+}
+
+/* PARSER */
+
+static int
+parse_cipher_name(char *full, char **cipher, char **pad)
+{
+	char	   *p,
+			   *p2,
+			   *q;
+
+	*cipher = full;
+	*pad = NULL;
+
+	p = strchr(full, '/');
+	if (p != NULL)
+		*p++ = 0;
+	while (p != NULL)
+	{
+		if ((q = strchr(p, '/')) != NULL)
+			*q++ = 0;
+
+		if (!*p)
+		{
+			p = q;
+			continue;
+		}
+		p2 = strchr(p, ':');
+		if (p2 != NULL)
+		{
+			*p2++ = 0;
+			if (strcmp(p, "pad") == 0)
+				*pad = p2;
+			else
+				return PXE_BAD_OPTION;
+		}
+		else
+			return PXE_BAD_FORMAT;
+
+		p = q;
+	}
+	return 0;
+}
+
+/* provider */
+
+int
+px_find_combo(const char *name, PX_Combo **res)
+{
+	int			err;
+	char	   *buf,
+			   *s_cipher,
+			   *s_pad;
+
+	PX_Combo   *cx;
+
+	cx = palloc0(sizeof(*cx));
+	buf = pstrdup(name);
+
+	err = parse_cipher_name(buf, &s_cipher, &s_pad);
+	if (err)
+	{
+		pfree(buf);
+		pfree(cx);
+		return err;
+	}
+
+	err = px_find_cipher(s_cipher, &cx->cipher);
+	if (err)
+		goto err1;
+
+	if (s_pad != NULL)
+	{
+		if (strcmp(s_pad, "pkcs") == 0)
+			cx->padding = 1;
+		else if (strcmp(s_pad, "none") == 0)
+			cx->padding = 0;
+		else
+			goto err1;
+	}
+	else
+		cx->padding = 1;
+
+	cx->init = combo_init;
+	cx->encrypt = combo_encrypt;
+	cx->decrypt = combo_decrypt;
+	cx->encrypt_len = combo_encrypt_len;
+	cx->decrypt_len = combo_decrypt_len;
+	cx->free = combo_free;
+
+	pfree(buf);
+
+	*res = cx;
+
+	return 0;
+
+err1:
+	if (cx->cipher)
+		px_cipher_free(cx->cipher);
+	pfree(cx);
+	pfree(buf);
+	return PXE_NO_CIPHER;
+}