SECStatus
SSL_ExportKeyingMaterial(PRFileDesc *fd,
const char *label, unsigned int labelLen,
PRBool hasContext,
const unsigned char *context, unsigned int contextLen,
unsigned char *out, unsigned int outLen)
{
sslSocket *ss;
unsigned char *val = NULL;
unsigned int valLen, i;
SECStatus rv = SECFailure;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in ExportKeyingMaterial",
SSL_GETPID(), fd));
return SECFailure;
}
if (!label || !labelLen || !out || !outLen ||
(hasContext && (!context || !contextLen))) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (ss->version >= SSL_LIBRARY_VERSION_TLS_1_3) {
return tls13_Exporter(ss, ss->ssl3.hs.exporterSecret,
label, labelLen,
context, hasContext ? contextLen : 0,
out, outLen);
}
if (hasContext && contextLen > MAX_CONTEXT_LEN) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
/* construct PRF arguments */
valLen = SSL3_RANDOM_LENGTH * 2;
if (hasContext) {
valLen += 2 /* PRUint16 length */ + contextLen;
}
val = PORT_Alloc(valLen);
if (!val) {
return SECFailure;
}
i = 0;
PORT_Memcpy(val + i, &ss->ssl3.hs.client_random.rand, SSL3_RANDOM_LENGTH);
i += SSL3_RANDOM_LENGTH;
PORT_Memcpy(val + i, &ss->ssl3.hs.server_random.rand, SSL3_RANDOM_LENGTH);
i += SSL3_RANDOM_LENGTH;
if (hasContext) {
val[i++] = contextLen >> 8;
val[i++] = contextLen;
PORT_Memcpy(val + i, context, contextLen);
i += contextLen;
}
PORT_Assert(i == valLen);
/* Allow TLS keying material to be exported sooner, when the master
* secret is available and we have sent ChangeCipherSpec.
*/
ssl_GetSpecReadLock(ss);
if (!ss->ssl3.cwSpec->master_secret && !ss->ssl3.cwSpec->msItem.len) {
PORT_SetError(SSL_ERROR_HANDSHAKE_NOT_COMPLETED);
rv = SECFailure;
} else {
rv = ssl3_TLSPRFWithMasterSecret(ss, ss->ssl3.cwSpec, label, labelLen,
val, valLen, out, outLen);
}
ssl_ReleaseSpecReadLock(ss);
PORT_ZFree(val, valLen);
return rv;
}
SECStatus
SSL_ExportKeyingMaterial(PRFileDesc *fd,
const char *label, unsigned int labelLen,
PRBool hasContext,
const unsigned char *context, unsigned int contextLen,
unsigned char *out, unsigned int outLen)
{
sslSocket *ss;
unsigned char *val = NULL;
unsigned int valLen, i;
SECStatus rv = SECFailure;
ss = ssl_FindSocket(fd);
if (!ss) {
SSL_DBG(("%d: SSL[%d]: bad socket in ExportKeyingMaterial",
SSL_GETPID(), fd));
return SECFailure;
}
ssl_GetRecvBufLock(ss);
ssl_GetSSL3HandshakeLock(ss);
if (ss->version < SSL_LIBRARY_VERSION_3_1_TLS) {
PORT_SetError(SSL_ERROR_FEATURE_NOT_SUPPORTED_FOR_VERSION);
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_ReleaseRecvBufLock(ss);
return SECFailure;
}
valLen = SSL3_RANDOM_LENGTH * 2;
if (hasContext) {
valLen += 2 + contextLen;
}
val = PORT_Alloc(valLen);
if (!val) {
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_ReleaseRecvBufLock(ss);
return SECFailure;
}
i = 0;
PORT_Memcpy(val + i, &ss->ssl3.hs.client_random.rand, SSL3_RANDOM_LENGTH);
i += SSL3_RANDOM_LENGTH;
PORT_Memcpy(val + i, &ss->ssl3.hs.server_random.rand, SSL3_RANDOM_LENGTH);
i += SSL3_RANDOM_LENGTH;
if (hasContext) {
val[i++] = contextLen >> 8;
val[i++] = contextLen;
PORT_Memcpy(val + i, context, contextLen);
i += contextLen;
}
PORT_Assert(i == valLen);
ssl_GetSpecReadLock(ss);
if (!ss->ssl3.cwSpec->master_secret && !ss->ssl3.cwSpec->msItem.len) {
PORT_SetError(SSL_ERROR_HANDSHAKE_NOT_COMPLETED);
rv = SECFailure;
} else {
rv = ssl3_TLSPRFWithMasterSecret(ss->ssl3.cwSpec, label, labelLen, val,
valLen, out, outLen);
}
ssl_ReleaseSpecReadLock(ss);
ssl_ReleaseSSL3HandshakeLock(ss);
ssl_ReleaseRecvBufLock(ss);
PORT_ZFree(val, valLen);
return rv;
}
