Header And Logo
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#include "postgres.h"#include "imath.h"#include "px.h"#include "mbuf.h"#include "pgp.h"
Go to the source code of this file.
Functions | |
| static mpz_t * | mp_new () |
| static void | mp_clear_free (mpz_t *a) |
| static int | mp_px_rand (uint32 bits, mpz_t *res) |
| static void | mp_modmul (mpz_t *a, mpz_t *b, mpz_t *p, mpz_t *res) |
| static mpz_t * | mpi_to_bn (PGP_MPI *n) |
| static PGP_MPI * | bn_to_mpi (mpz_t *bn) |
| static int | decide_k_bits (int p_bits) |
| int | pgp_elgamal_encrypt (PGP_PubKey *pk, PGP_MPI *_m, PGP_MPI **c1_p, PGP_MPI **c2_p) |
| int | pgp_elgamal_decrypt (PGP_PubKey *pk, PGP_MPI *_c1, PGP_MPI *_c2, PGP_MPI **msg_p) |
| int | pgp_rsa_encrypt (PGP_PubKey *pk, PGP_MPI *_m, PGP_MPI **c_p) |
| int | pgp_rsa_decrypt (PGP_PubKey *pk, PGP_MPI *_c, PGP_MPI **m_p) |
Definition at line 120 of file pgp-mpi-internal.c.
References PGP_MPI::bytes, PGP_MPI::data, mp_int_count_bits(), mp_int_to_unsigned(), pgp_mpi_alloc(), pgp_mpi_free(), and px_debug().
Referenced by pgp_elgamal_decrypt(), pgp_elgamal_encrypt(), pgp_rsa_decrypt(), and pgp_rsa_encrypt().
{
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;
}
| static int decide_k_bits | ( | int | p_bits | ) | [static] |
Definition at line 158 of file pgp-mpi-internal.c.
Referenced by pgp_elgamal_encrypt().
{
if (p_bits <= 5120)
return p_bits / 10 + 160;
else
return (p_bits / 8 + 200) * 3 / 2;
}
| static void mp_clear_free | ( | mpz_t * | a | ) | [static] |
Definition at line 49 of file pgp-mpi-internal.c.
References mp_int_free().
Referenced by mp_modmul(), mpi_to_bn(), pgp_elgamal_decrypt(), pgp_elgamal_encrypt(), pgp_rsa_decrypt(), and pgp_rsa_encrypt().
{
if (!a)
return;
/* fixme: no clear? */
mp_int_free(a);
}
Definition at line 91 of file pgp-mpi-internal.c.
References mp_clear_free(), mp_int_mod(), mp_int_mul(), and mp_new().
Referenced by pgp_elgamal_decrypt(), and pgp_elgamal_encrypt().
{
mpz_t *tmp = mp_new();
mp_int_mul(a, b, tmp);
mp_int_mod(tmp, p, res);
mp_clear_free(tmp);
}
| static mpz_t* mp_new | ( | ) | [static] |
Definition at line 40 of file pgp-mpi-internal.c.
References mp_int_alloc(), and mp_int_init_size().
Referenced by mp_modmul(), mpi_to_bn(), pgp_elgamal_decrypt(), pgp_elgamal_encrypt(), pgp_rsa_decrypt(), and pgp_rsa_encrypt().
{
mpz_t *mp = mp_int_alloc();
mp_int_init_size(mp, 256);
return mp;
}
Definition at line 59 of file pgp-mpi-internal.c.
References buf, mp_int_read_unsigned(), px_alloc, px_free, and px_get_random_bytes().
Referenced by pgp_elgamal_encrypt().
{
int err;
unsigned bytes = (bits + 7) / 8;
int last_bits = bits & 7;
uint8 *buf;
buf = px_alloc(bytes);
err = px_get_random_bytes(buf, bytes);
if (err < 0)
{
px_free(buf);
return err;
}
/* 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);
px_free(buf);
return 0;
}
Definition at line 101 of file pgp-mpi-internal.c.
References PGP_MPI::bits, PGP_MPI::bytes, PGP_MPI::data, mp_clear_free(), mp_int_count_bits(), mp_int_read_unsigned(), mp_new(), and px_debug().
Referenced by pgp_elgamal_decrypt(), pgp_elgamal_encrypt(), pgp_rsa_decrypt(), and pgp_rsa_encrypt().
{
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;
}
| int pgp_elgamal_decrypt | ( | PGP_PubKey * | pk, | |
| PGP_MPI * | _c1, | |||
| PGP_MPI * | _c2, | |||
| PGP_MPI ** | msg_p | |||
| ) |
Definition at line 217 of file pgp-mpi-internal.c.
Referenced by decrypt_elgamal().
{
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_elgamal_encrypt | ( | PGP_PubKey * | pk, | |
| PGP_MPI * | _m, | |||
| PGP_MPI ** | c1_p, | |||
| PGP_MPI ** | c2_p | |||
| ) |
Definition at line 167 of file pgp-mpi-internal.c.
Referenced by encrypt_and_write_elgamal().
{
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_rsa_decrypt | ( | PGP_PubKey * | pk, | |
| PGP_MPI * | _c, | |||
| PGP_MPI ** | m_p | |||
| ) |
Definition at line 283 of file pgp-mpi-internal.c.
Referenced by decrypt_rsa().
{
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;
}
| int pgp_rsa_encrypt | ( | PGP_PubKey * | pk, | |
| PGP_MPI * | _m, | |||
| PGP_MPI ** | c_p | |||
| ) |
Definition at line 255 of file pgp-mpi-internal.c.
Referenced by encrypt_and_write_rsa().
{
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;
}
1.7.1