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authorPeter Eisentraut <peter@eisentraut.org>2021-11-05 13:59:42 +0100
committerPeter Eisentraut <peter@eisentraut.org>2021-11-05 14:06:59 +0100
commitdb7d1a7b0530e8cbd045744e1c75b0e63fb6916f (patch)
treea03045045b1bd83cabc6bd2994c156c93c5b65a7 /contrib/pgcrypto/pgp-mpi-internal.c
parenta5b336b8b9e04a93e7c8526302504d2e5201eb80 (diff)
downloadpostgresql-db7d1a7b0530e8cbd045744e1c75b0e63fb6916f.tar.gz
postgresql-db7d1a7b0530e8cbd045744e1c75b0e63fb6916f.zip
pgcrypto: Remove non-OpenSSL support
pgcrypto had internal implementations of some encryption algorithms, as an alternative to calling out to OpenSSL. These were rarely used, since most production installations are built with OpenSSL. Moreover, maintaining parallel code paths makes the code more complex and difficult to maintain. This patch removes these internal implementations. Now, pgcrypto is only built if OpenSSL support is configured. Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://www.postgresql.org/message-id/flat/0b42f1df-8cba-6a30-77d7-acc241cc88c1%40enterprisedb.com
Diffstat (limited to 'contrib/pgcrypto/pgp-mpi-internal.c')
-rw-r--r--contrib/pgcrypto/pgp-mpi-internal.c304
1 files changed, 0 insertions, 304 deletions
diff --git a/contrib/pgcrypto/pgp-mpi-internal.c b/contrib/pgcrypto/pgp-mpi-internal.c
deleted file mode 100644
index 5b94e654521..00000000000
--- a/contrib/pgcrypto/pgp-mpi-internal.c
+++ /dev/null
@@ -1,304 +0,0 @@
-/*
- * pgp-mpi-internal.c
- * OpenPGP MPI 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-internal.c
- */
-#include "postgres.h"
-
-#include "imath.h"
-#include "pgp.h"
-#include "px.h"
-
-static mpz_t *
-mp_new(void)
-{
- mpz_t *mp = mp_int_alloc();
-
- mp_int_init_size(mp, 256);
- return mp;
-}
-
-static void
-mp_clear_free(mpz_t *a)
-{
- if (!a)
- return;
- /* fixme: no clear? */
- mp_int_free(a);
-}
-
-
-static int
-mp_px_rand(uint32 bits, mpz_t *res)
-{
- unsigned bytes = (bits + 7) / 8;
- int last_bits = bits & 7;
- uint8 *buf;
-
- buf = palloc(bytes);
- if (!pg_strong_random(buf, bytes))
- {
- pfree(buf);
- return PXE_NO_RANDOM;
- }
-
- /* clear unnecessary bits and set last bit to one */
- if (last_bits)
- {
- buf[0] >>= 8 - last_bits;
- buf[0] |= 1 << (last_bits - 1);
- }
- else
- buf[0] |= 1 << 7;
-
- mp_int_read_unsigned(res, buf, bytes);
-
- pfree(buf);
-
- return 0;
-}
-
-static void
-mp_modmul(mpz_t *a, mpz_t *b, mpz_t *p, mpz_t *res)
-{
- mpz_t *tmp = mp_new();
-
- mp_int_mul(a, b, tmp);
- mp_int_mod(tmp, p, res);
- mp_clear_free(tmp);
-}
-
-static mpz_t *
-mpi_to_bn(PGP_MPI *n)
-{
- mpz_t *bn = mp_new();
-
- mp_int_read_unsigned(bn, n->data, n->bytes);
-
- if (!bn)
- return NULL;
- if (mp_int_count_bits(bn) != n->bits)
- {
- px_debug("mpi_to_bn: bignum conversion failed: mpi=%d, bn=%d",
- n->bits, mp_int_count_bits(bn));
- mp_clear_free(bn);
- return NULL;
- }
- return bn;
-}
-
-static PGP_MPI *
-bn_to_mpi(mpz_t *bn)
-{
- int res;
- PGP_MPI *n;
- int bytes;
-
- res = pgp_mpi_alloc(mp_int_count_bits(bn), &n);
- if (res < 0)
- return NULL;
-
- bytes = (mp_int_count_bits(bn) + 7) / 8;
- if (bytes != n->bytes)
- {
- px_debug("bn_to_mpi: bignum conversion failed: bn=%d, mpi=%d",
- bytes, n->bytes);
- pgp_mpi_free(n);
- return NULL;
- }
- mp_int_to_unsigned(bn, n->data, n->bytes);
- return n;
-}
-
-/*
- * Decide the number of bits in the random component k
- *
- * It should be in the same range as p for signing (which
- * is deprecated), but can be much smaller for encrypting.
- *
- * Until I research it further, I just mimic gpg behaviour.
- * It has a special mapping table, for values <= 5120,
- * above that it uses 'arbitrary high number'. Following
- * algorithm hovers 10-70 bits above gpg values. And for
- * larger p, it uses gpg's algorithm.
- *
- * The point is - if k gets large, encryption will be
- * really slow. It does not matter for decryption.
- */
-static int
-decide_k_bits(int p_bits)
-{
- if (p_bits <= 5120)
- return p_bits / 10 + 160;
- else
- return (p_bits / 8 + 200) * 3 / 2;
-}
-
-int
-pgp_elgamal_encrypt(PGP_PubKey *pk, PGP_MPI *_m,
- PGP_MPI **c1_p, PGP_MPI **c2_p)
-{
- int res = PXE_PGP_MATH_FAILED;
- int k_bits;
- mpz_t *m = mpi_to_bn(_m);
- mpz_t *p = mpi_to_bn(pk->pub.elg.p);
- mpz_t *g = mpi_to_bn(pk->pub.elg.g);
- mpz_t *y = mpi_to_bn(pk->pub.elg.y);
- mpz_t *k = mp_new();
- mpz_t *yk = mp_new();
- mpz_t *c1 = mp_new();
- mpz_t *c2 = mp_new();
-
- if (!m || !p || !g || !y || !k || !yk || !c1 || !c2)
- goto err;
-
- /*
- * generate k
- */
- k_bits = decide_k_bits(mp_int_count_bits(p));
- res = mp_px_rand(k_bits, k);
- if (res < 0)
- return res;
-
- /*
- * c1 = g^k c2 = m * y^k
- */
- mp_int_exptmod(g, k, p, c1);
- mp_int_exptmod(y, k, p, yk);
- mp_modmul(m, yk, p, c2);
-
- /* result */
- *c1_p = bn_to_mpi(c1);
- *c2_p = bn_to_mpi(c2);
- if (*c1_p && *c2_p)
- res = 0;
-err:
- mp_clear_free(c2);
- mp_clear_free(c1);
- mp_clear_free(yk);
- mp_clear_free(k);
- mp_clear_free(y);
- mp_clear_free(g);
- mp_clear_free(p);
- mp_clear_free(m);
- return res;
-}
-
-int
-pgp_elgamal_decrypt(PGP_PubKey *pk, PGP_MPI *_c1, PGP_MPI *_c2,
- PGP_MPI **msg_p)
-{
- int res = PXE_PGP_MATH_FAILED;
- mpz_t *c1 = mpi_to_bn(_c1);
- mpz_t *c2 = mpi_to_bn(_c2);
- mpz_t *p = mpi_to_bn(pk->pub.elg.p);
- mpz_t *x = mpi_to_bn(pk->sec.elg.x);
- mpz_t *c1x = mp_new();
- mpz_t *div = mp_new();
- mpz_t *m = mp_new();
-
- if (!c1 || !c2 || !p || !x || !c1x || !div || !m)
- goto err;
-
- /*
- * m = c2 / (c1^x)
- */
- mp_int_exptmod(c1, x, p, c1x);
- mp_int_invmod(c1x, p, div);
- mp_modmul(c2, div, p, m);
-
- /* result */
- *msg_p = bn_to_mpi(m);
- if (*msg_p)
- res = 0;
-err:
- mp_clear_free(m);
- mp_clear_free(div);
- mp_clear_free(c1x);
- mp_clear_free(x);
- mp_clear_free(p);
- mp_clear_free(c2);
- mp_clear_free(c1);
- return res;
-}
-
-int
-pgp_rsa_encrypt(PGP_PubKey *pk, PGP_MPI *_m, PGP_MPI **c_p)
-{
- int res = PXE_PGP_MATH_FAILED;
- mpz_t *m = mpi_to_bn(_m);
- mpz_t *e = mpi_to_bn(pk->pub.rsa.e);
- mpz_t *n = mpi_to_bn(pk->pub.rsa.n);
- mpz_t *c = mp_new();
-
- if (!m || !e || !n || !c)
- goto err;
-
- /*
- * c = m ^ e
- */
- mp_int_exptmod(m, e, n, c);
-
- *c_p = bn_to_mpi(c);
- if (*c_p)
- res = 0;
-err:
- mp_clear_free(c);
- mp_clear_free(n);
- mp_clear_free(e);
- mp_clear_free(m);
- return res;
-}
-
-int
-pgp_rsa_decrypt(PGP_PubKey *pk, PGP_MPI *_c, PGP_MPI **m_p)
-{
- int res = PXE_PGP_MATH_FAILED;
- mpz_t *c = mpi_to_bn(_c);
- mpz_t *d = mpi_to_bn(pk->sec.rsa.d);
- mpz_t *n = mpi_to_bn(pk->pub.rsa.n);
- mpz_t *m = mp_new();
-
- if (!m || !d || !n || !c)
- goto err;
-
- /*
- * m = c ^ d
- */
- mp_int_exptmod(c, d, n, m);
-
- *m_p = bn_to_mpi(m);
- if (*m_p)
- res = 0;
-err:
- mp_clear_free(m);
- mp_clear_free(n);
- mp_clear_free(d);
- mp_clear_free(c);
- return res;
-}