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