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using Srtp;
namespace Crypto.Srtp {
public const string AES_CM_128_HMAC_SHA1_80 = "AES_CM_128_HMAC_SHA1_80";
public const string AES_CM_128_HMAC_SHA1_32 = "AES_CM_128_HMAC_SHA1_32";
public const string F8_128_HMAC_SHA1_80 = "F8_128_HMAC_SHA1_80";
public class Session {
public bool has_encrypt { get; private set; default = false; }
public bool has_decrypt { get; private set; default = false; }
private Context encrypt_context;
private Context decrypt_context;
static construct {
init();
install_log_handler(log);
}
private static void log(LogLevel level, string msg) {
print(@"SRTP[$level]: $msg\n");
}
public Session() {
Context.create(out encrypt_context, null);
Context.create(out decrypt_context, null);
}
public uint8[] encrypt_rtp(uint8[] data) throws Error {
uint8[] buf = new uint8[data.length + MAX_TRAILER_LEN];
Memory.copy(buf, data, data.length);
int buf_use = data.length;
ErrorStatus res = encrypt_context.protect(buf, ref buf_use);
if (res != ErrorStatus.ok) {
throw new Error.UNKNOWN(@"SRTP encrypt failed: $res");
}
uint8[] ret = new uint8[buf_use];
GLib.Memory.copy(ret, buf, buf_use);
return ret;
}
public uint8[] decrypt_rtp(uint8[] data) throws Error {
uint8[] buf = new uint8[data.length];
Memory.copy(buf, data, data.length);
int buf_use = data.length;
ErrorStatus res = decrypt_context.unprotect(buf, ref buf_use);
switch (res) {
case ErrorStatus.auth_fail:
throw new Error.AUTHENTICATION_FAILED("SRTP packet failed the message authentication check");
case ErrorStatus.ok:
break;
default:
throw new Error.UNKNOWN(@"SRTP decrypt failed: $res");
}
uint8[] ret = new uint8[buf_use];
GLib.Memory.copy(ret, buf, buf_use);
return ret;
}
public uint8[] encrypt_rtcp(uint8[] data) throws Error {
uint8[] buf = new uint8[data.length + MAX_TRAILER_LEN + 4];
Memory.copy(buf, data, data.length);
int buf_use = data.length;
ErrorStatus res = encrypt_context.protect_rtcp(buf, ref buf_use);
if (res != ErrorStatus.ok) {
throw new Error.UNKNOWN(@"SRTCP encrypt failed: $res");
}
uint8[] ret = new uint8[buf_use];
GLib.Memory.copy(ret, buf, buf_use);
return ret;
}
public uint8[] decrypt_rtcp(uint8[] data) throws Error {
uint8[] buf = new uint8[data.length];
Memory.copy(buf, data, data.length);
int buf_use = data.length;
ErrorStatus res = decrypt_context.unprotect_rtcp(buf, ref buf_use);
switch (res) {
case ErrorStatus.auth_fail:
throw new Error.AUTHENTICATION_FAILED("SRTCP packet failed the message authentication check");
case ErrorStatus.ok:
break;
default:
throw new Error.UNKNOWN(@"SRTP decrypt failed: $res");
}
uint8[] ret = new uint8[buf_use];
GLib.Memory.copy(ret, buf, buf_use);
return ret;
}
private Policy create_policy(string profile) {
Policy policy = Policy();
switch (profile) {
case AES_CM_128_HMAC_SHA1_80:
policy.rtp.set_aes_cm_128_hmac_sha1_80();
policy.rtcp.set_aes_cm_128_hmac_sha1_80();
break;
}
return policy;
}
public void set_encryption_key(string profile, uint8[] key, uint8[] salt) {
Policy policy = create_policy(profile);
policy.ssrc.type = SsrcType.any_outbound;
policy.key = new uint8[key.length + salt.length];
Memory.copy(policy.key, key, key.length);
Memory.copy(((uint8*)policy.key) + key.length, salt, salt.length);
encrypt_context.add_stream(ref policy);
has_encrypt = true;
}
public void set_decryption_key(string profile, uint8[] key, uint8[] salt) {
Policy policy = create_policy(profile);
policy.ssrc.type = SsrcType.any_inbound;
policy.key = new uint8[key.length + salt.length];
Memory.copy(policy.key, key, key.length);
Memory.copy(((uint8*)policy.key) + key.length, salt, salt.length);
decrypt_context.add_stream(ref policy);
has_decrypt = true;
}
}
}
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