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-rw-r--r--plugins/crypto-vala/src/srtp.vala122
1 files changed, 122 insertions, 0 deletions
diff --git a/plugins/crypto-vala/src/srtp.vala b/plugins/crypto-vala/src/srtp.vala
new file mode 100644
index 00000000..493afdb0
--- /dev/null
+++ b/plugins/crypto-vala/src/srtp.vala
@@ -0,0 +1,122 @@
+using Srtp;
+
+public class 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;
+ }
+ }
+} \ No newline at end of file