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Add crypto_mod_exp() for GnuTLS (libgcrypt)

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This allows WPS to be linked with GnuTLS.
This commit is contained in:
Jouni Malinen 2009-02-05 18:57:26 +02:00
parent a7baefda28
commit 3a19555445
1 changed files with 35 additions and 0 deletions
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35
src/crypto/crypto_gnutls.c
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@ -163,3 +163,38 @@ void aes_decrypt_deinit(void *ctx)
gcry_cipher_close(hd);
}
#endif /* EAP_TLS_FUNCS */
int crypto_mod_exp(const u8 *base, size_t base_len,
const u8 *power, size_t power_len,
const u8 *modulus, size_t modulus_len,
u8 *result, size_t *result_len)
{
gcry_mpi_t bn_base = NULL, bn_exp = NULL, bn_modulus = NULL,
bn_result = NULL;
int ret = -1;
if (gcry_mpi_scan(&bn_base, GCRYMPI_FMT_USG, base, base_len, NULL) !=
GPG_ERR_NO_ERROR ||
gcry_mpi_scan(&bn_exp, GCRYMPI_FMT_USG, power, power_len, NULL) !=
GPG_ERR_NO_ERROR ||
gcry_mpi_scan(&bn_modulus, GCRYMPI_FMT_USG, modulus, modulus_len,
NULL) != GPG_ERR_NO_ERROR)
goto error;
bn_result = gcry_mpi_new(modulus_len * 8);
gcry_mpi_powm(bn_result, bn_base, bn_exp, bn_modulus);
if (gcry_mpi_print(GCRYMPI_FMT_USG, result, *result_len, result_len,
bn_result) != GPG_ERR_NO_ERROR)
goto error;
ret = 0;
error:
gcry_mpi_release(bn_base);
gcry_mpi_release(bn_exp);
gcry_mpi_release(bn_modulus);
gcry_mpi_release(bn_result);
return ret;
}