c-ipfs/repo/config/identity.c

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/**
* an "Identity"
*/
#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include "ipfs/repo/config/identity.h"
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#include "libp2p/crypto/rsa.h"
#include "libp2p/crypto/peerutils.h"
#include "libp2p/crypto/encoding/base64.h"
#include "libp2p/crypto/encoding/x509.h"
/**
* Builds the Peer ID using the private key, and places it in the identity->peer_id
* @param identity Where to get the DER of the private key
* @returns true(1) on success
*/
int repo_config_identity_build_peer_id(struct Identity* identity) {
// ic key and PeerID
unsigned char hash[32];
ID_FromPK_non_null_terminated((char*)hash, (unsigned char*)identity->private_key.der, identity->private_key.der_length);
// peer id is multihashed
size_t sz = 255;
unsigned char results[sz];
if (PrettyID(results, &sz, hash, 32) == 0)
return 0;
// copy it into the structure
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if (identity->peer_id != NULL)
free(identity->peer_id);
identity->peer_id = (char*)malloc(sz + 1);
if (identity->peer_id == NULL)
return 0;
strncpy(identity->peer_id, (char*)results, sz);
identity->peer_id[sz] = 0;
return 1;
}
/***
* public methods
*/
/***
* Initializes a new Identity. NOTE: This builds a new private/public key pair
* @param identity the identity to fill
* @param num_bits_for_keypair the number of bits for the keypair
* @returns true(1) on success, false(0) otherwise
*/
int repo_config_identity_init(struct Identity* identity, unsigned long num_bits_for_keypair) {
if (num_bits_for_keypair < 1024)
return 0;
// generate the private key (& public)
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if (!libp2p_crypto_rsa_generate_keypair( &(identity->private_key), num_bits_for_keypair))
return 0;
if (repo_config_identity_build_peer_id(identity) == 0)
return 0;
return 1;
}
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int repo_config_identity_new(struct Identity** identity) {
*identity = (struct Identity*)malloc(sizeof(struct Identity));
if (*identity == NULL)
return 0;
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memset(*identity, 0, sizeof(struct Identity));
(*identity)->peer_id = NULL;
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(*identity)->private_key.public_key_der = NULL;
(*identity)->private_key.der = NULL;
return 1;
}
int repo_config_identity_free(struct Identity* identity) {
if (identity != NULL) {
if (identity->private_key.public_key_der != NULL)
free(identity->private_key.public_key_der);
if (identity->private_key.der != NULL)
free(identity->private_key.der);
if (identity->peer_id != NULL)
free(identity->peer_id);
free(identity);
}
return 1;
}
/***
* Build a RsaPrivateKey struct from a base64 string of the private key
* @param identity where to put the new struct
* @param base64 the null terminated base 64 encoded private key in DER format
* @returns true(1) on success
*/
int repo_config_identity_build_private_key(struct Identity* identity, const char* base64) {
size_t decoded_size = libp2p_crypto_encoding_base64_decode_size(strlen(base64));
unsigned char decoded[decoded_size];
int retVal = libp2p_crypto_encoding_base64_decode((unsigned char*)base64, strlen(base64), decoded, decoded_size, &decoded_size);
if (retVal == 0)
return 0;
// now convert DER to RsaPrivateKey
retVal = libp2p_crypto_encoding_x509_der_to_private_key(decoded, decoded_size, &identity->private_key);
if (retVal == 0)
return 0;
// now build the private key DER
retVal = libp2p_crypto_rsa_private_key_fill_public_key(&identity->private_key);
if (retVal == 0)
return 0;
// now build PeerID
retVal = repo_config_identity_build_peer_id(identity);
return retVal;
}