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89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/*
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* Crypto wrapper for internal crypto implementation - modexp
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* Copyright (c) 2006-2009, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "atbm_hal.h"
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#include "bignum.h"
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int crypto_mod_exp(const atbm_uint8 *base, atbm_size_t base_len,
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const atbm_uint8 *power, atbm_size_t power_len,
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const atbm_uint8 *modulus, atbm_size_t modulus_len,
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atbm_uint8 *result, atbm_size_t *result_len)
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{
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int ret = -1;
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atbm_uint32 start_T, end_T;
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#if 1
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atbm_mbedtls_mpi iresult, ibase, ipower, imodulus, ictx;
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start_T = atbm_GetOsTime();
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atbm_mbedtls_mpi_init(&iresult);
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atbm_mbedtls_mpi_init(&ibase);
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atbm_mbedtls_mpi_init(&ipower);
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atbm_mbedtls_mpi_init(&imodulus);
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atbm_mbedtls_mpi_init(&ictx);
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if (atbm_mbedtls_mpi_read_binary(&ibase, base, base_len) < 0 ||
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atbm_mbedtls_mpi_read_binary(&ipower, power, power_len) < 0 ||
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atbm_mbedtls_mpi_read_binary(&imodulus, modulus, modulus_len) < 0)
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goto error;
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end_T = atbm_GetOsTime();
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wpa_printf(MSG_ALWAYS, "cryptoexp:1 =%dms", end_T-start_T);
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if (atbm_mbedtls_mpi_exp_mod( &iresult, &ibase, &ipower, &imodulus, &ictx ) < 0)
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goto error;
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end_T = atbm_GetOsTime();
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wpa_printf(MSG_ALWAYS, "cryptoexp:2 =%dms", end_T-start_T);
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ret = atbm_mbedtls_mpi_write_binary( &iresult, result, *result_len);
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error:
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atbm_mbedtls_mpi_free(&iresult);
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atbm_mbedtls_mpi_free(&ibase);
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atbm_mbedtls_mpi_free(&ipower);
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atbm_mbedtls_mpi_free(&imodulus);
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atbm_mbedtls_mpi_free(&ictx);
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#else
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struct bignum *bn_base, *bn_exp, *bn_modulus, *bn_result;
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bn_base = bignum_init();
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bn_exp = bignum_init();
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bn_modulus = bignum_init();
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bn_result = bignum_init();
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wifi_printk("crypto_mod_exp\n");
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if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
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bn_result == NULL)
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goto error;
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if (bignum_set_unsigned_bin(bn_base, base, base_len) < 0 ||
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bignum_set_unsigned_bin(bn_exp, power, power_len) < 0 ||
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bignum_set_unsigned_bin(bn_modulus, modulus, modulus_len) < 0)
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goto error;
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wifi_printk("crypto_mod_exp222\n");
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if (bignum_exptmod(bn_base, bn_exp, bn_modulus, bn_result) < 0)
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goto error;
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wifi_printk("crypto_mod_exp333\n");
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ret = bignum_get_unsigned_bin(bn_result, result, result_len);
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wifi_printk("crypto_mod_exp444\n");
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error:
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bignum_deinit(bn_base);
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bignum_deinit(bn_exp);
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bignum_deinit(bn_modulus);
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bignum_deinit(bn_result);
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#endif
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return ret;
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}
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