79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
//
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// rsa.c
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// c-libp2p
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//
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// Created by John Jones on 11/3/16.
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// Copyright © 2016 JMJAtlanta. All rights reserved.
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//
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#include <stdio.h>
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#include <string.h>
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#include "libp2p/crypto/rsa.h"
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// mbedtls stuff
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#include "mbedtls/config.h"
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#include "mbedtls/platform.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/bignum.h"
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#include "mbedtls/x509.h"
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#include "mbedtls/rsa.h"
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int crypto_rsa_generate_keypair(struct RsaPrivateKey* private_key, unsigned long num_bits_for_keypair) {
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mbedtls_rsa_context rsa;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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int exponent = 65537;
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int retVal = 1;
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const char *pers = "rsa_genkey";
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// initialize mbedtls structs
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mbedtls_ctr_drbg_init( &ctr_drbg );
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mbedtls_entropy_init( &entropy );
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// seed the routines
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if( ( retVal = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen( pers ) ) ) != 0 )
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{
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retVal = 0;
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goto exit;
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}
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// initialize the rsa struct
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mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
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// finally, generate the key
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if( ( retVal = mbedtls_rsa_gen_key( &rsa, mbedtls_ctr_drbg_random, &ctr_drbg, (unsigned int)num_bits_for_keypair,
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exponent ) ) != 0 )
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{
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retVal = 0;
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goto exit;
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}
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retVal = 1;
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// fill in values of structures
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private_key->public_key.modulus = *(rsa.N.p);
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private_key->public_key.exponent = *(rsa.E.p);
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private_key->prime1 = *(rsa.DP.p);
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private_key->prime2 = *(rsa.Q.p);
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private_key->private_exponent = *(rsa.D.p);
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//TODO: fill in the rest of the precomputed values
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private_key->precomputed_values.dp = *(rsa.DP.p);
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private_key->precomputed_values.dq = *(rsa.DQ.p);
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retVal = 1;
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exit:
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mbedtls_rsa_free( &rsa );
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mbedtls_ctr_drbg_free( &ctr_drbg );
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mbedtls_entropy_free( &entropy );
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return retVal;
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}
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