agorise/c-libp2p
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More cleanup

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This commit is contained in:
John Jones 2017-02-09 04:55:16 -05:00
parent c1620d1d8b
commit e55f81490d
3 changed files with 47 additions and 13 deletions
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39
crypto/rsa.c
View file

@ -256,20 +256,36 @@ int libp2p_crypto_rsa_rsa_private_key_free(struct RsaPrivateKey* private_key) {
* @param message the message to be signed
* @param message_length the length of message
* @param result the resultant signature. Note: should be pre-allocated and be the size of the private key (i.e. 2048 bit key can store a sig in 256 bytes)
* @returns true(1) on successs, otherwise false(0)
* @returns true(1) on success, otherwise false(0)
*/
int libp2p_crypto_rsa_sign(struct RsaPrivateKey* private_key, const char* message, size_t message_length, unsigned char* result) {
unsigned char hash[32];
int retVal = 0;
char* pers = "libp2p crypto rsa sign";
mbedtls_pk_context private_context;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
char* pers = "libp2p crypto rsa sign";
unsigned char* der = NULL;
int der_allocated = 0;
// hash the incoming message
libp2p_crypto_hashing_sha256(message, message_length, hash);
// put a null terminator on the key (if ncessary)
if (private_key->der[private_key->der_length-1] != 0) {
der = (unsigned char*)malloc(private_key->der_length + 1);
if (der == NULL)
goto exit;
der_allocated = 1;
memcpy(der, private_key->der, private_key->der_length);
der[private_key->der_length] = 0;
} else {
der = private_key->der;
}
// make a pk_context from the private key
mbedtls_pk_init(&private_context);
mbedtls_pk_parse_key(&private_context, (unsigned char*)private_key->der, private_key->der_length, NULL, 0);
if (mbedtls_pk_parse_key(&private_context, der, private_key->der_length, NULL, 0) != 0)
goto exit;
// get just the RSA portion of the context
mbedtls_rsa_context* ctx = mbedtls_pk_rsa(private_context);
@ -279,7 +295,7 @@ int libp2p_crypto_rsa_sign(struct RsaPrivateKey* private_key, const char* messag
// seed the routines
if( mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy, (const unsigned char *) pers, strlen( pers ) ) != 0 )
return 0;
goto exit;
// sign
@ -293,11 +309,20 @@ int libp2p_crypto_rsa_sign(struct RsaPrivateKey* private_key, const char* messag
output,
result );
*/
int retVal = mbedtls_rsa_private(ctx, mbedtls_ctr_drbg_random, &ctr_drbg, hash, result);
retVal = mbedtls_rsa_private(ctx, mbedtls_ctr_drbg_random, &ctr_drbg, hash, result);
if (retVal != 0) {
retVal = 0;
goto exit;
}
retVal = 1;
// cleanup
exit:
mbedtls_ctr_drbg_free(&ctr_drbg);
//mbedtls_pk_free(private_context);
return retVal == 0;
mbedtls_entropy_free(&entropy);
mbedtls_pk_free(&private_context);
if (der_allocated)
free(der);
return retVal;
}
/**

1
include/libp2p/secio/exchange.h
View file

@ -8,6 +8,7 @@ struct Exchange {
};
struct Exchange* libp2p_secio_exchange_new();
void libp2p_secio_exchange_free(struct Exchange* in);
/**
* retrieves the approximate size of an encoded version of the passed in struct

20
secio/secio.c
View file

@ -495,13 +495,17 @@ int libp2p_secio_handshake(struct SecureSession* local_session, struct RsaPrivat
unsigned char order_hash_in[32];
unsigned char order_hash_out[32];
int order;
struct Exchange* exchange_out;
struct Exchange* exchange_in = NULL;
struct Exchange* exchange_out = NULL;
unsigned char* exchange_out_protobuf;
size_t exchange_out_protobuf_size;
struct Exchange* exchange_in;
struct Libp2pVector* char_buffer = NULL;
struct StretchedKey* k1 = NULL, *k2 = NULL;
struct PrivateKey priv;
struct PublicKey pub_key;
struct SecureSession remote_session;
char* remote_peer_id = NULL;
struct EphemeralPrivateKey* e_private_key = NULL;
const unsigned char* protocol = (unsigned char*)"/secio/1.0.0\n";
@ -529,7 +533,6 @@ int libp2p_secio_handshake(struct SecureSession* local_session, struct RsaPrivat
libp2p_secio_propose_set_property((void**)&propose_out->rand, &propose_out->rand_size, local_session->nonce, 16);
// public key - protobuf it and stick it in propose_out
struct PublicKey pub_key;
pub_key.type = KEYTYPE_RSA;
pub_key.data_size = private_key->public_key_length;
pub_key.data = malloc(pub_key.data_size);
@ -600,13 +603,11 @@ int libp2p_secio_handshake(struct SecureSession* local_session, struct RsaPrivat
goto exit;
// prepare exchange of encryption parameters
struct SecureSession remote_session;
remote_session.chosen_cipher = local_session->chosen_cipher;
remote_session.chosen_curve = local_session->chosen_curve;
remote_session.chosen_hash = local_session->chosen_hash;
// generate EphemeralPubKey
struct EphemeralPrivateKey* e_private_key;
if (libp2p_crypto_ephemeral_keypair_generate(local_session->chosen_curve, &e_private_key) == 0)
goto exit;
@ -614,6 +615,7 @@ int libp2p_secio_handshake(struct SecureSession* local_session, struct RsaPrivat
memcpy(local_session->ephemeral_public_key, e_private_key->public_key->bytes, e_private_key->public_key->bytes_size);
local_session->ephemeral_public_key_size = e_private_key->public_key->bytes_size;
libp2p_crypto_ephemeral_key_free(e_private_key);
e_private_key = NULL;
// build buffer to sign
char_buffer = libp2p_utils_vector_new();
@ -628,7 +630,7 @@ int libp2p_secio_handshake(struct SecureSession* local_session, struct RsaPrivat
exchange_out->epubkey = (unsigned char*)malloc(local_session->ephemeral_public_key_size);
memcpy(exchange_out->epubkey, local_session->ephemeral_public_key, local_session->ephemeral_public_key_size);
exchange_out->epubkey_size = local_session->ephemeral_public_key_size;
struct PrivateKey priv;
priv.type = KEYTYPE_RSA;
priv.data = (unsigned char*)private_key->der;
priv.data_size = private_key->der_length;
@ -641,6 +643,8 @@ int libp2p_secio_handshake(struct SecureSession* local_session, struct RsaPrivat
if (exchange_out_protobuf == NULL)
goto exit;
libp2p_secio_exchange_protobuf_encode(exchange_out, exchange_out_protobuf, exchange_out_protobuf_size, &bytes_written);
libp2p_secio_exchange_free(exchange_out);
exchange_out = NULL;
bytes_written = libp2p_secio_write(local_session, exchange_out_protobuf, exchange_out_protobuf_size);
free(exchange_out_protobuf);
@ -707,6 +711,10 @@ int libp2p_secio_handshake(struct SecureSession* local_session, struct RsaPrivat
libp2p_crypto_public_key_free(public_key);
if (remote_peer_id != NULL)
free(remote_peer_id);
if (exchange_out != NULL)
libp2p_secio_exchange_free(exchange_out);
if (e_private_key != NULL)
libp2p_crypto_ephemeral_key_free(e_private_key);
libp2p_secio_propose_free(propose_out);
libp2p_secio_propose_free(propose_in);