summaryrefslogtreecommitdiffstats
path: root/contrib/pgcrypto/pgp-mpi.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--contrib/pgcrypto/pgp-mpi.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/contrib/pgcrypto/pgp-mpi.c b/contrib/pgcrypto/pgp-mpi.c
new file mode 100644
index 0000000..36a6d36
--- /dev/null
+++ b/contrib/pgcrypto/pgp-mpi.c
@@ -0,0 +1,142 @@
+/*
+ * pgp-mpi.c
+ * OpenPGP MPI helper functions.
+ *
+ * Copyright (c) 2005 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/pgp-mpi.c
+ */
+#include "postgres.h"
+
+#include "pgp.h"
+#include "px.h"
+
+int
+pgp_mpi_alloc(int bits, PGP_MPI **mpi)
+{
+ PGP_MPI *n;
+ int len = (bits + 7) / 8;
+
+ if (bits < 0 || bits > 0xFFFF)
+ {
+ px_debug("pgp_mpi_alloc: unreasonable request: bits=%d", bits);
+ return PXE_PGP_CORRUPT_DATA;
+ }
+ n = px_alloc(sizeof(*n) + len);
+ n->bits = bits;
+ n->bytes = len;
+ n->data = (uint8 *) (n) + sizeof(*n);
+ *mpi = n;
+ return 0;
+}
+
+int
+pgp_mpi_create(uint8 *data, int bits, PGP_MPI **mpi)
+{
+ int res;
+ PGP_MPI *n;
+
+ res = pgp_mpi_alloc(bits, &n);
+ if (res < 0)
+ return res;
+ memcpy(n->data, data, n->bytes);
+ *mpi = n;
+ return 0;
+}
+
+int
+pgp_mpi_free(PGP_MPI *mpi)
+{
+ if (mpi == NULL)
+ return 0;
+ px_memset(mpi, 0, sizeof(*mpi) + mpi->bytes);
+ px_free(mpi);
+ return 0;
+}
+
+int
+pgp_mpi_read(PullFilter *src, PGP_MPI **mpi)
+{
+ int res;
+ uint8 hdr[2];
+ int bits;
+ PGP_MPI *n;
+
+ res = pullf_read_fixed(src, 2, hdr);
+ if (res < 0)
+ return res;
+ bits = ((unsigned) hdr[0] << 8) + hdr[1];
+
+ res = pgp_mpi_alloc(bits, &n);
+ if (res < 0)
+ return res;
+
+ res = pullf_read_fixed(src, n->bytes, n->data);
+ if (res < 0)
+ pgp_mpi_free(n);
+ else
+ *mpi = n;
+ return res;
+}
+
+int
+pgp_mpi_write(PushFilter *dst, PGP_MPI *n)
+{
+ int res;
+ uint8 buf[2];
+
+ buf[0] = n->bits >> 8;
+ buf[1] = n->bits & 0xFF;
+ res = pushf_write(dst, buf, 2);
+ if (res >= 0)
+ res = pushf_write(dst, n->data, n->bytes);
+ return res;
+}
+
+int
+pgp_mpi_hash(PX_MD *md, PGP_MPI *n)
+{
+ uint8 buf[2];
+
+ buf[0] = n->bits >> 8;
+ buf[1] = n->bits & 0xFF;
+ px_md_update(md, buf, 2);
+ px_md_update(md, n->data, n->bytes);
+
+ return 0;
+}
+
+unsigned
+pgp_mpi_cksum(unsigned cksum, PGP_MPI *n)
+{
+ int i;
+
+ cksum += n->bits >> 8;
+ cksum += n->bits & 0xFF;
+ for (i = 0; i < n->bytes; i++)
+ cksum += n->data[i];
+
+ return cksum & 0xFFFF;
+}