diff options
Diffstat (limited to 'contrib/pgcrypto/pgp-mpi.c')
| -rw-r--r-- | contrib/pgcrypto/pgp-mpi.c | 142 |
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; +} |