path: root/patches/channelid.patch

diff -ur openssl/crypto/evp/evp.h openssl.channelid/crypto/evp/evp.h
--- openssl/crypto/evp/evp.h	2012-05-16 12:44:09.000000000 -0400
+++ openssl.channelid/crypto/evp/evp.h	2012-08-28 16:19:15.195752493 -0400
@@ -922,6 +922,7 @@
 #endif
 
 EVP_PKEY *	EVP_PKEY_new(void);
+EVP_PKEY *	EVP_PKEY_dup(EVP_PKEY *pkey);
 void		EVP_PKEY_free(EVP_PKEY *pkey);
 
 EVP_PKEY *	d2i_PublicKey(int type,EVP_PKEY **a, const unsigned char **pp,
diff -ur openssl/crypto/evp/p_lib.c openssl.channelid/crypto/evp/p_lib.c
--- openssl/crypto/evp/p_lib.c	2011-02-01 09:46:34.000000000 -0500
+++ openssl.channelid/crypto/evp/p_lib.c	2012-08-29 16:22:27.467810070 -0400
@@ -200,6 +200,12 @@
 	return(ret);
 	}
 
+EVP_PKEY *EVP_PKEY_dup(EVP_PKEY *pkey)
+	{
+	CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
+	return pkey;
+	}
+
 /* Setup a public key ASN1 method and ENGINE from a NID or a string.
  * If pkey is NULL just return 1 or 0 if the algorithm exists.
  */
diff -ur openssl/ssl/s3_both.c openssl.channelid/ssl/s3_both.c
--- openssl/ssl/s3_both.c	2012-08-28 16:04:21.173349370 -0400
+++ openssl.channelid/ssl/s3_both.c	2012-08-28 16:04:40.583618671 -0400
@@ -544,7 +544,8 @@
 		ssl3_take_mac(s);
 #endif
 	/* Feed this message into MAC computation. */
-	ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
+	if (*s->init_buf->data != SSL3_MT_ENCRYPTED_EXTENSIONS)
+		ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
 	if (s->msg_callback)
 		s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);
 	*ok=1;
diff -ur openssl/ssl/s3_clnt.c openssl.channelid/ssl/s3_clnt.c
--- openssl/ssl/s3_clnt.c	2012-08-28 16:04:21.173349370 -0400
+++ openssl.channelid/ssl/s3_clnt.c	2012-08-28 16:04:42.563646142 -0400
@@ -465,14 +465,14 @@
 				SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 			if (ret <= 0) goto end;
 
-
-#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 			s->state=SSL3_ST_CW_FINISHED_A;
-#else
+#if !defined(OPENSSL_NO_TLSEXT)
+			if (s->s3->tlsext_channel_id_valid)
+				s->state=SSL3_ST_CW_CHANNEL_ID_A;
+# if !defined(OPENSSL_NO_NEXTPROTONEG)
 			if (s->s3->next_proto_neg_seen)
 				s->state=SSL3_ST_CW_NEXT_PROTO_A;
-			else
-				s->state=SSL3_ST_CW_FINISHED_A;
+# endif
 #endif
 			s->init_num=0;
 
@@ -506,6 +506,18 @@
 		case SSL3_ST_CW_NEXT_PROTO_B:
 			ret=ssl3_send_next_proto(s);
 			if (ret <= 0) goto end;
+			if (s->s3->tlsext_channel_id_valid)
+				s->state=SSL3_ST_CW_CHANNEL_ID_A;
+			else
+				s->state=SSL3_ST_CW_FINISHED_A;
+			break;
+#endif
+
+#if !defined(OPENSSL_NO_TLSEXT)
+		case SSL3_ST_CW_CHANNEL_ID_A:
+		case SSL3_ST_CW_CHANNEL_ID_B:
+			ret=ssl3_send_channel_id(s);
+			if (ret <= 0) goto end;
 			s->state=SSL3_ST_CW_FINISHED_A;
 			break;
 #endif
@@ -3339,7 +3351,8 @@
 	return(0);
 	}
 
-#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
+#if !defined(OPENSSL_NO_TLSEXT)
+# if !defined(OPENSSL_NO_NEXTPROTONEG)
 int ssl3_send_next_proto(SSL *s)
 	{
 	unsigned int len, padding_len;
@@ -3363,7 +3376,116 @@
 
 	return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
 }
-#endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
+# endif  /* !OPENSSL_NO_NEXTPROTONEG */
+
+int ssl3_send_channel_id(SSL *s)
+	{
+	unsigned char *d;
+	int ret = -1, public_key_len;
+	EVP_MD_CTX md_ctx;
+	size_t sig_len;
+	ECDSA_SIG *sig = NULL;
+	unsigned char *public_key = NULL, *derp, *der_sig = NULL;
+
+	if (s->state != SSL3_ST_CW_CHANNEL_ID_A)
+		return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
+
+	d = (unsigned char *)s->init_buf->data;
+	*(d++)=SSL3_MT_ENCRYPTED_EXTENSIONS;
+	l2n3(2 + 2 + TLSEXT_CHANNEL_ID_SIZE, d);
+	s2n(TLSEXT_TYPE_channel_id, d);
+	s2n(TLSEXT_CHANNEL_ID_SIZE, d);
+
+	EVP_MD_CTX_init(&md_ctx);
+
+	public_key_len = i2d_PublicKey(s->tlsext_channel_id_private, NULL);
+	if (public_key_len <= 0)
+		{
+		SSLerr(SSL_F_SSL3_SEND_CHANNEL_ID,SSL_R_CANNOT_SERIALIZE_PUBLIC_KEY);
+		goto err;
+		}
+	// i2d_PublicKey will produce an ANSI X9.62 public key which, for a
+	// P-256 key, is 0x04 (meaning uncompressed) followed by the x and y
+	// field elements as 32-byte, big-endian numbers.
+	if (public_key_len != 65)
+		{
+		SSLerr(SSL_F_SSL3_SEND_CHANNEL_ID,SSL_R_CHANNEL_ID_NOT_P256);
+		goto err;
+		}
+	public_key = OPENSSL_malloc(public_key_len);
+	if (!public_key)
+		{
+		SSLerr(SSL_F_SSL3_SEND_CHANNEL_ID,ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	derp = public_key;
+	i2d_PublicKey(s->tlsext_channel_id_private, &derp);
+
+	if (EVP_DigestSignInit(&md_ctx, NULL, EVP_sha256(), NULL,
+			       s->tlsext_channel_id_private) != 1)
+		{
+		SSLerr(SSL_F_SSL3_SEND_CHANNEL_ID,SSL_R_EVP_DIGESTSIGNINIT_FAILED);
+		goto err;
+		}
+
+	if (!tls1_channel_id_hash(&md_ctx, s))
+		goto err;
+
+	if (!EVP_DigestSignFinal(&md_ctx, NULL, &sig_len))
+		{
+		SSLerr(SSL_F_SSL3_SEND_CHANNEL_ID,SSL_R_EVP_DIGESTSIGNFINAL_FAILED);
+		goto err;
+		}
+
+	der_sig = OPENSSL_malloc(sig_len);
+	if (!der_sig)
+		{
+		SSLerr(SSL_F_SSL3_SEND_CHANNEL_ID,ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	if (!EVP_DigestSignFinal(&md_ctx, der_sig, &sig_len))
+		{
+		SSLerr(SSL_F_SSL3_SEND_CHANNEL_ID,SSL_R_EVP_DIGESTSIGNFINAL_FAILED);
+		goto err;
+		}
+
+	derp = der_sig;
+	sig = d2i_ECDSA_SIG(NULL, &derp, sig_len);
+	if (sig == NULL)
+		{
+		SSLerr(SSL_F_SSL3_SEND_CHANNEL_ID,SSL_R_D2I_ECDSA_SIG);
+		goto err;
+		}
+
+	// The first byte of public_key will be 0x4, denoting an uncompressed key.
+	memcpy(d, public_key + 1, 64);
+	d += 64;
+	memset(d, 0, 2 * 32);
+	BN_bn2bin(sig->r, d + 32 - BN_num_bytes(sig->r));
+	d += 32;
+	BN_bn2bin(sig->s, d + 32 - BN_num_bytes(sig->s));
+	d += 32;
+
+	s->state = SSL3_ST_CW_CHANNEL_ID_B;
+	s->init_num = 4 + 2 + 2 + TLSEXT_CHANNEL_ID_SIZE;
+	s->init_off = 0;
+
+	ret = ssl3_do_write(s, SSL3_RT_HANDSHAKE);
+
+err:
+	EVP_MD_CTX_cleanup(&md_ctx);
+	if (public_key)
+		OPENSSL_free(public_key);
+	if (der_sig)
+		OPENSSL_free(der_sig);
+	if (sig)
+		ECDSA_SIG_free(sig);
+
+	return ret;
+	}
+#endif  /* !OPENSSL_NO_TLSEXT */
 
 /* Check to see if handshake is full or resumed. Usually this is just a
  * case of checking to see if a cache hit has occurred. In the case of
diff -ur openssl/ssl/s3_lib.c openssl.channelid/ssl/s3_lib.c
--- openssl/ssl/s3_lib.c	2012-08-28 16:04:21.173349370 -0400
+++ openssl.channelid/ssl/s3_lib.c	2012-08-28 16:19:15.195752493 -0400
@@ -2951,6 +2951,11 @@
 #ifndef OPENSSL_NO_SRP
 	SSL_SRP_CTX_init(s);
 #endif
+#if !defined(OPENSSL_NO_TLSEXT)
+	s->tlsext_channel_id_enabled = s->ctx->tlsext_channel_id_enabled;
+	if (s->ctx->tlsext_channel_id_private)
+		s->tlsext_channel_id_private = EVP_PKEY_dup(s->ctx->tlsext_channel_id_private);
+#endif
 	s->method->ssl_clear(s);
 	return(1);
 err:
@@ -3074,6 +3079,10 @@
 		s->next_proto_negotiated_len = 0;
 		}
 #endif
+
+#if !defined(OPENSSL_NO_TLSEXT)
+	s->s3->tlsext_channel_id_valid = 0;
+#endif
 	}
 
 #ifndef OPENSSL_NO_SRP
@@ -3348,6 +3357,35 @@
 		ret = 1;
 		break;
 #endif
+	case SSL_CTRL_CHANNEL_ID:
+		if (!s->server)
+			break;
+		s->tlsext_channel_id_enabled = 1;
+		ret = 1;
+		break;
+
+	case SSL_CTRL_SET_CHANNEL_ID:
+		if (s->server)
+			break;
+		s->tlsext_channel_id_enabled = 1;
+		if (EVP_PKEY_bits(parg) != 256)
+			{
+			SSLerr(SSL_F_SSL3_CTRL,SSL_R_CHANNEL_ID_NOT_P256);
+			break;
+			}
+		if (s->tlsext_channel_id_private)
+			EVP_PKEY_free(s->tlsext_channel_id_private);
+		s->tlsext_channel_id_private = (EVP_PKEY*) parg;
+		ret = 1;
+		break;
+
+	case SSL_CTRL_GET_CHANNEL_ID:
+		if (!s->server)
+			break;
+		if (!s->s3->tlsext_channel_id_valid)
+			break;
+		memcpy(parg, s->s3->tlsext_channel_id, larg < 64 ? larg : 64);
+		return 64;
 
 #endif /* !OPENSSL_NO_TLSEXT */
 	default:
@@ -3569,6 +3607,12 @@
 			}
 		return 1;
 		}
+	case SSL_CTRL_CHANNEL_ID:
+		/* must be called on a server */
+		if (ctx->method->ssl_accept == ssl_undefined_function)
+			return 0;
+		ctx->tlsext_channel_id_enabled=1;
+		return 1;
 
 #ifdef TLSEXT_TYPE_opaque_prf_input
 	case SSL_CTRL_SET_TLSEXT_OPAQUE_PRF_INPUT_CB_ARG:
@@ -3637,6 +3681,18 @@
 			}
 		break;
 
+	case SSL_CTRL_SET_CHANNEL_ID:
+		ctx->tlsext_channel_id_enabled = 1;
+		if (EVP_PKEY_bits(parg) != 256)
+			{
+			SSLerr(SSL_F_SSL3_CTX_CTRL,SSL_R_CHANNEL_ID_NOT_P256);
+			break;
+			}
+		if (ctx->tlsext_channel_id_private)
+			EVP_PKEY_free(ctx->tlsext_channel_id_private);
+		ctx->tlsext_channel_id_private = (EVP_PKEY*) parg;
+		break;
+
 	default:
 		return(0);
 		}
diff -ur openssl/ssl/s3_srvr.c openssl.channelid/ssl/s3_srvr.c
--- openssl/ssl/s3_srvr.c	2012-08-28 16:04:21.173349370 -0400
+++ openssl.channelid/ssl/s3_srvr.c	2012-08-28 16:04:40.593618810 -0400
@@ -158,8 +158,11 @@
 #include <openssl/buffer.h>
 #include <openssl/rand.h>
 #include <openssl/objects.h>
+#include <openssl/ec.h>
+#include <openssl/ecdsa.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
+#include <openssl/sha.h>
 #include <openssl/x509.h>
 #ifndef OPENSSL_NO_DH
 #include <openssl/dh.h>
@@ -621,15 +624,8 @@
 				 * the client uses its key from the certificate
 				 * for key exchange.
 				 */
-#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
-				s->state=SSL3_ST_SR_FINISHED_A;
-#else
-				if (s->s3->next_proto_neg_seen)
-					s->state=SSL3_ST_SR_NEXT_PROTO_A;
-				else
-					s->state=SSL3_ST_SR_FINISHED_A;
-#endif
 				s->init_num = 0;
+				s->state=SSL3_ST_SR_POST_CLIENT_CERT;
 				}
 			else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 				{
@@ -689,16 +685,28 @@
 			ret=ssl3_get_cert_verify(s);
 			if (ret <= 0) goto end;
 
-#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
-			s->state=SSL3_ST_SR_FINISHED_A;
-#else
-			if (s->s3->next_proto_neg_seen)
+			s->state=SSL3_ST_SR_POST_CLIENT_CERT;
+			s->init_num=0;
+			break;
+
+		case SSL3_ST_SR_POST_CLIENT_CERT: {
+			char next_proto_neg = 0;
+			char channel_id = 0;
+#if !defined(OPENSSL_NO_TLSEXT)
+# if !defined(OPENSSL_NO_NEXTPROTONEG)
+			next_proto_neg = s->s3->next_proto_neg_seen;
+# endif
+			channel_id = s->s3->tlsext_channel_id_valid;
+#endif
+
+			if (next_proto_neg)
 				s->state=SSL3_ST_SR_NEXT_PROTO_A;
+			else if (channel_id)
+				s->state=SSL3_ST_SR_CHANNEL_ID_A;
 			else
 				s->state=SSL3_ST_SR_FINISHED_A;
-#endif
-			s->init_num=0;
 			break;
+		}
 
 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 		case SSL3_ST_SR_NEXT_PROTO_A:
@@ -706,6 +714,19 @@
 			ret=ssl3_get_next_proto(s);
 			if (ret <= 0) goto end;
 			s->init_num = 0;
+			if (s->s3->tlsext_channel_id_valid)
+				s->state=SSL3_ST_SR_CHANNEL_ID_A;
+			else
+				s->state=SSL3_ST_SR_FINISHED_A;
+			break;
+#endif
+
+#if !defined(OPENSSL_NO_TLSEXT)
+		case SSL3_ST_SR_CHANNEL_ID_A:
+		case SSL3_ST_SR_CHANNEL_ID_B:
+			ret=ssl3_get_channel_id(s);
+			if (ret <= 0) goto end;
+			s->init_num = 0;
 			s->state=SSL3_ST_SR_FINISHED_A;
 			break;
 #endif
@@ -777,16 +798,7 @@
 			if (ret <= 0) goto end;
 			s->state=SSL3_ST_SW_FLUSH;
 			if (s->hit)
-				{
-#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
-				s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
-#else
-				if (s->s3->next_proto_neg_seen)
-					s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
-				else
-					s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
-#endif
-				}
+				s->s3->tmp.next_state=SSL3_ST_SR_POST_CLIENT_CERT;
 			else
 				s->s3->tmp.next_state=SSL_ST_OK;
 			s->init_num=0;
@@ -3679,4 +3691,140 @@
 	return 1;
 	}
 # endif
+
+/* ssl3_get_channel_id reads and verifies a ClientID handshake message. */
+int ssl3_get_channel_id(SSL *s)
+	{
+	int ret = -1, ok;
+	long n;
+	const unsigned char *p;
+	unsigned short extension_type, extension_len;
+	EC_GROUP* p256 = NULL;
+	EC_KEY* key = NULL;
+	EC_POINT* point = NULL;
+	ECDSA_SIG sig;
+	BIGNUM x, y;
+
+	if (s->state == SSL3_ST_SR_CHANNEL_ID_A && s->init_num == 0)
+		{
+		/* The first time that we're called we take the current
+		 * handshake hash and store it. */
+		EVP_MD_CTX md_ctx;
+		unsigned int len;
+
+		EVP_MD_CTX_init(&md_ctx);
+		EVP_DigestInit_ex(&md_ctx, EVP_sha256(), NULL);
+		if (!tls1_channel_id_hash(&md_ctx, s))
+			return -1;
+		len = sizeof(s->s3->tlsext_channel_id);
+		EVP_DigestFinal(&md_ctx, s->s3->tlsext_channel_id, &len);
+		EVP_MD_CTX_cleanup(&md_ctx);
+		}
+
+	n = s->method->ssl_get_message(s,
+		SSL3_ST_SR_CHANNEL_ID_A,
+		SSL3_ST_SR_CHANNEL_ID_B,
+		SSL3_MT_ENCRYPTED_EXTENSIONS,
+		2 + 2 + TLSEXT_CHANNEL_ID_SIZE,
+		&ok);
+
+	if (!ok)
+		return((int)n);
+
+	ssl3_finish_mac(s, (unsigned char*)s->init_buf->data, s->init_num + 4);
+
+	/* s->state doesn't reflect whether ChangeCipherSpec has been received
+	 * in this handshake, but s->s3->change_cipher_spec does (will be reset
+	 * by ssl3_get_finished). */
+	if (!s->s3->change_cipher_spec)
+		{
+		SSLerr(SSL_F_SSL3_GET_CHANNEL_ID,SSL_R_GOT_CHANNEL_ID_BEFORE_A_CCS);
+		return -1;
+		}
+
+	if (n != 2 + 2 + TLSEXT_CHANNEL_ID_SIZE)
+		{
+		SSLerr(SSL_F_SSL3_GET_CHANNEL_ID,SSL_R_INVALID_MESSAGE);
+		return -1;
+		}
+
+	p = (unsigned char *)s->init_msg;
+
+	/* The payload looks like:
+	 *   uint16 extension_type
+	 *   uint16 extension_len;
+	 *   uint8 x[32];
+	 *   uint8 y[32];
+	 *   uint8 r[32];
+	 *   uint8 s[32];
+	 */
+	n2s(p, extension_type);
+	n2s(p, extension_len);
+
+	if (extension_type != TLSEXT_TYPE_channel_id ||
+	    extension_len != TLSEXT_CHANNEL_ID_SIZE)
+		{
+		SSLerr(SSL_F_SSL3_GET_CHANNEL_ID,SSL_R_INVALID_MESSAGE);
+		return -1;
+		}
+
+	p256 = EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1);
+	if (!p256)
+		{
+		SSLerr(SSL_F_SSL3_GET_CHANNEL_ID,SSL_R_NO_P256_SUPPORT);
+		return -1;
+		}
+
+	BN_init(&x);
+	BN_init(&y);
+	sig.r = BN_new();
+	sig.s = BN_new();
+
+	if (BN_bin2bn(p +  0, 32, &x) == NULL ||
+	    BN_bin2bn(p + 32, 32, &y) == NULL ||
+	    BN_bin2bn(p + 64, 32, sig.r) == NULL ||
+	    BN_bin2bn(p + 96, 32, sig.s) == NULL)
+		goto err;
+
+	point = EC_POINT_new(p256);
+	if (!point ||
+	    !EC_POINT_set_affine_coordinates_GFp(p256, point, &x, &y, NULL))
+		goto err;
+
+	key = EC_KEY_new();
+	if (!key ||
+	    !EC_KEY_set_group(key, p256) ||
+	    !EC_KEY_set_public_key(key, point))
+		goto err;
+
+	/* We stored the handshake hash in |tlsext_channel_id| the first time
+	 * that we were called. */
+	switch (ECDSA_do_verify(s->s3->tlsext_channel_id, SHA256_DIGEST_LENGTH, &sig, key)) {
+	case 1:
+		break;
+	case 0:
+		SSLerr(SSL_F_SSL3_GET_CHANNEL_ID,SSL_R_CHANNEL_ID_SIGNATURE_INVALID);
+		s->s3->tlsext_channel_id_valid = 0;
+		goto err;
+	default:
+		s->s3->tlsext_channel_id_valid = 0;
+		goto err;
+	}
+
+	memcpy(s->s3->tlsext_channel_id, p, 64);
+	ret = 1;
+
+err:
+	BN_free(&x);
+	BN_free(&y);
+	BN_free(sig.r);
+	BN_free(sig.s);
+	if (key)
+		EC_KEY_free(key);
+	if (point)
+		EC_POINT_free(point);
+	if (p256)
+		EC_GROUP_free(p256);
+	return ret;
+	}
 #endif
diff -ur openssl/ssl/ssl.h openssl.channelid/ssl/ssl.h
--- openssl/ssl/ssl.h	2012-08-28 16:04:21.183349508 -0400
+++ openssl.channelid/ssl/ssl.h	2012-08-28 16:19:15.195752493 -0400
@@ -1016,6 +1016,12 @@
 # endif
         /* SRTP profiles we are willing to do from RFC 5764 */
         STACK_OF(SRTP_PROTECTION_PROFILE) *srtp_profiles;  
+
+	/* If true, a client will advertise the Channel ID extension and a
+	 * server will echo it. */
+	char tlsext_channel_id_enabled;
+	/* The client's Channel ID private key. */
+	EVP_PKEY *tlsext_channel_id_private;
 #endif
 	};
 
@@ -1057,6 +1063,10 @@
 	SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_TIMEOUTS,0,NULL)
 #define SSL_CTX_sess_cache_full(ctx) \
 	SSL_CTX_ctrl(ctx,SSL_CTRL_SESS_CACHE_FULL,0,NULL)
+/* SSL_CTX_enable_tls_channel_id configures a TLS server to accept TLS client
+ * IDs from clients. Returns 1 on success. */
+#define SSL_CTX_enable_tls_channel_id(ctx) \
+	SSL_CTX_ctrl(ctx,SSL_CTRL_CHANNEL_ID,0,NULL)
 
 void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, int (*new_session_cb)(struct ssl_st *ssl,SSL_SESSION *sess));
 int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(struct ssl_st *ssl, SSL_SESSION *sess);
@@ -1400,6 +1410,13 @@
 	                                 */
 	unsigned int tlsext_hb_pending; /* Indicates if a HeartbeatRequest is in flight */
 	unsigned int tlsext_hb_seq;     /* HeartbeatRequest sequence number */
+
+	/* Copied from the SSL_CTX. For a server, means that we'll accept
+	 * Channel IDs from clients. For a client, means that we'll advertise
+	 * support. */
+	char tlsext_channel_id_enabled;
+	/* The client's Channel ID private key. */
+	EVP_PKEY *tlsext_channel_id_private;
 #else
 #define session_ctx ctx
 #endif /* OPENSSL_NO_TLSEXT */
@@ -1659,6 +1676,9 @@
 #define SSL_CTRL_GET_TLS_EXT_HEARTBEAT_PENDING		86
 #define SSL_CTRL_SET_TLS_EXT_HEARTBEAT_NO_REQUESTS	87
 #endif
+#define SSL_CTRL_CHANNEL_ID			88
+#define SSL_CTRL_GET_CHANNEL_ID			89
+#define SSL_CTRL_SET_CHANNEL_ID			90
 #endif
 
 #define DTLS_CTRL_GET_TIMEOUT		73
@@ -1706,6 +1726,25 @@
 #define SSL_set_tmp_ecdh(ssl,ecdh) \
 	SSL_ctrl(ssl,SSL_CTRL_SET_TMP_ECDH,0,(char *)ecdh)
 
+/* SSL_enable_tls_channel_id configures a TLS server to accept TLS client
+ * IDs from clients. Returns 1 on success. */
+#define SSL_enable_tls_channel_id(ctx) \
+	SSL_ctrl(ctx,SSL_CTRL_CHANNEL_ID,0,NULL)
+/* SSL_set1_tls_channel_id configures a TLS client to send a TLS Channel ID to
+ * compatible servers. private_key must be a P-256 EVP_PKEY*. Returns 1 on
+ * success. */
+#define SSL_set1_tls_channel_id(s, private_key) \
+	SSL_ctrl(s,SSL_CTRL_SET_CHANNEL_ID,0,(void*)private_key)
+#define SSL_CTX_set1_tls_channel_id(ctx, private_key) \
+	SSL_CTX_ctrl(ctx,SSL_CTRL_SET_CHANNEL_ID,0,(void*)private_key)
+/* SSL_get_tls_channel_id gets the client's TLS Channel ID from a server SSL*
+ * and copies up to the first |channel_id_len| bytes into |channel_id|. The
+ * Channel ID consists of the client's P-256 public key as an (x,y) pair where
+ * each is a 32-byte, big-endian field element. Returns 0 if the client didn't
+ * offer a Channel ID and the length of the complete Channel ID otherwise. */
+#define SSL_get_tls_channel_id(ctx, channel_id, channel_id_len) \
+	SSL_ctrl(ctx,SSL_CTRL_GET_CHANNEL_ID,channel_id_len,(void*)channel_id)
+
 #define SSL_CTX_add_extra_chain_cert(ctx,x509) \
 	SSL_CTX_ctrl(ctx,SSL_CTRL_EXTRA_CHAIN_CERT,0,(char *)x509)
 #define SSL_CTX_get_extra_chain_certs(ctx,px509) \
@@ -2207,6 +2246,7 @@
 #define SSL_F_SSL3_GET_CERTIFICATE_REQUEST		 135
 #define SSL_F_SSL3_GET_CERT_STATUS			 289
 #define SSL_F_SSL3_GET_CERT_VERIFY			 136
+#define SSL_F_SSL3_GET_CHANNEL_ID			 317
 #define SSL_F_SSL3_GET_CLIENT_CERTIFICATE		 137
 #define SSL_F_SSL3_GET_CLIENT_HELLO			 138
 #define SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE		 139
@@ -2226,6 +2266,7 @@
 #define SSL_F_SSL3_READ_BYTES				 148
 #define SSL_F_SSL3_READ_N				 149
 #define SSL_F_SSL3_SEND_CERTIFICATE_REQUEST		 150
+#define SSL_F_SSL3_SEND_CHANNEL_ID			 318
 #define SSL_F_SSL3_SEND_CLIENT_CERTIFICATE		 151
 #define SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE		 152
 #define SSL_F_SSL3_SEND_CLIENT_VERIFY			 153
@@ -2391,12 +2432,15 @@
 #define SSL_R_BIO_NOT_SET				 128
 #define SSL_R_BLOCK_CIPHER_PAD_IS_WRONG			 129
 #define SSL_R_BN_LIB					 130
+#define SSL_R_CANNOT_SERIALIZE_PUBLIC_KEY		 376
 #define SSL_R_CA_DN_LENGTH_MISMATCH			 131
 #define SSL_R_CA_DN_TOO_LONG				 132
 #define SSL_R_CCS_RECEIVED_EARLY			 133
 #define SSL_R_CERTIFICATE_VERIFY_FAILED			 134
 #define SSL_R_CERT_LENGTH_MISMATCH			 135
 #define SSL_R_CHALLENGE_IS_DIFFERENT			 136
+#define SSL_R_CHANNEL_ID_NOT_P256			 375
+#define SSL_R_CHANNEL_ID_SIGNATURE_INVALID		 371
 #define SSL_R_CIPHER_CODE_WRONG_LENGTH			 137
 #define SSL_R_CIPHER_OR_HASH_UNAVAILABLE		 138
 #define SSL_R_CIPHER_TABLE_SRC_ERROR			 139
@@ -2409,6 +2453,7 @@
 #define SSL_R_CONNECTION_ID_IS_DIFFERENT		 143
 #define SSL_R_CONNECTION_TYPE_NOT_SET			 144
 #define SSL_R_COOKIE_MISMATCH				 308
+#define SSL_R_D2I_ECDSA_SIG				 379
 #define SSL_R_DATA_BETWEEN_CCS_AND_FINISHED		 145
 #define SSL_R_DATA_LENGTH_TOO_LONG			 146
 #define SSL_R_DECRYPTION_FAILED				 147
@@ -2426,9 +2471,12 @@
 #define SSL_R_ENCRYPTED_LENGTH_TOO_LONG			 150
 #define SSL_R_ERROR_GENERATING_TMP_RSA_KEY		 282
 #define SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST		 151
+#define SSL_R_EVP_DIGESTSIGNFINAL_FAILED		 377
+#define SSL_R_EVP_DIGESTSIGNINIT_FAILED			 378
 #define SSL_R_EXCESSIVE_MESSAGE_SIZE			 152
 #define SSL_R_EXTRA_DATA_IN_MESSAGE			 153
 #define SSL_R_GOT_A_FIN_BEFORE_A_CCS			 154
+#define SSL_R_GOT_CHANNEL_ID_BEFORE_A_CCS		 372
 #define SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS		 355
 #define SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION		 356
 #define SSL_R_HTTPS_PROXY_REQUEST			 155
@@ -2438,6 +2486,7 @@
 #define SSL_R_INVALID_CHALLENGE_LENGTH			 158
 #define SSL_R_INVALID_COMMAND				 280
 #define SSL_R_INVALID_COMPRESSION_ALGORITHM		 341
+#define SSL_R_INVALID_MESSAGE				 374
 #define SSL_R_INVALID_PURPOSE				 278
 #define SSL_R_INVALID_SRP_USERNAME			 357
 #define SSL_R_INVALID_STATUS_RESPONSE			 328
@@ -2492,6 +2541,7 @@
 #define SSL_R_NO_COMPRESSION_SPECIFIED			 187
 #define SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER		 330
 #define SSL_R_NO_METHOD_SPECIFIED			 188
+#define SSL_R_NO_P256_SUPPORT				 373
 #define SSL_R_NO_PRIVATEKEY				 189
 #define SSL_R_NO_PRIVATE_KEY_ASSIGNED			 190
 #define SSL_R_NO_PROTOCOLS_AVAILABLE			 191
diff -ur openssl/ssl/ssl3.h openssl.channelid/ssl/ssl3.h
--- openssl/ssl/ssl3.h	2012-08-28 16:04:21.183349508 -0400
+++ openssl.channelid/ssl/ssl3.h	2012-08-28 16:04:40.593618810 -0400
@@ -539,6 +539,17 @@
 	/* Set if we saw the Next Protocol Negotiation extension from our peer. */
 	int next_proto_neg_seen;
 #endif
+
+	/* In a client, this means that the server supported Channel ID and that
+	 * a Channel ID was sent. In a server it means that we echoed support
+	 * for Channel IDs and that tlsext_channel_id will be valid after the
+	 * handshake. */
+	char tlsext_channel_id_valid;
+	/* For a server:
+	 *     If |tlsext_channel_id_valid| is true, then this contains the
+	 *     verified Channel ID from the client: a P256 point, (x,y), where
+	 *     each are big-endian values. */
+	unsigned char tlsext_channel_id[64];
 	} SSL3_STATE;
 
 #endif
@@ -581,6 +592,8 @@
 #define SSL3_ST_CW_CHANGE_B		(0x1A1|SSL_ST_CONNECT)
 #define SSL3_ST_CW_NEXT_PROTO_A		(0x200|SSL_ST_CONNECT)
 #define SSL3_ST_CW_NEXT_PROTO_B		(0x201|SSL_ST_CONNECT)
+#define SSL3_ST_CW_CHANNEL_ID_A		(0x210|SSL_ST_CONNECT)
+#define SSL3_ST_CW_CHANNEL_ID_B		(0x211|SSL_ST_CONNECT)
 #define SSL3_ST_CW_FINISHED_A		(0x1B0|SSL_ST_CONNECT)
 #define SSL3_ST_CW_FINISHED_B		(0x1B1|SSL_ST_CONNECT)
 /* read from server */
@@ -631,8 +644,11 @@
 #define SSL3_ST_SR_CERT_VRFY_B		(0x1A1|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_CHANGE_A		(0x1B0|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_CHANGE_B		(0x1B1|SSL_ST_ACCEPT)
+#define SSL3_ST_SR_POST_CLIENT_CERT	(0x1BF|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_NEXT_PROTO_A		(0x210|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_NEXT_PROTO_B		(0x211|SSL_ST_ACCEPT)
+#define SSL3_ST_SR_CHANNEL_ID_A		(0x220|SSL_ST_ACCEPT)
+#define SSL3_ST_SR_CHANNEL_ID_B		(0x221|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_FINISHED_A		(0x1C0|SSL_ST_ACCEPT)
 #define SSL3_ST_SR_FINISHED_B		(0x1C1|SSL_ST_ACCEPT)
 /* write to client */
@@ -658,6 +674,7 @@
 #define SSL3_MT_FINISHED			20
 #define SSL3_MT_CERTIFICATE_STATUS		22
 #define SSL3_MT_NEXT_PROTO			67
+#define SSL3_MT_ENCRYPTED_EXTENSIONS		203
 #define DTLS1_MT_HELLO_VERIFY_REQUEST    3
 
 
diff -ur openssl/ssl/ssl_err.c openssl.channelid/ssl/ssl_err.c
--- openssl/ssl/ssl_err.c	2012-08-28 16:04:21.183349508 -0400
+++ openssl.channelid/ssl/ssl_err.c	2012-08-28 16:04:40.593618810 -0400
@@ -151,6 +151,7 @@
 {ERR_FUNC(SSL_F_SSL3_GET_CERTIFICATE_REQUEST),	"SSL3_GET_CERTIFICATE_REQUEST"},
 {ERR_FUNC(SSL_F_SSL3_GET_CERT_STATUS),	"SSL3_GET_CERT_STATUS"},
 {ERR_FUNC(SSL_F_SSL3_GET_CERT_VERIFY),	"SSL3_GET_CERT_VERIFY"},
+{ERR_FUNC(SSL_F_SSL3_GET_CHANNEL_ID),	"SSL3_GET_CHANNEL_ID"},
 {ERR_FUNC(SSL_F_SSL3_GET_CLIENT_CERTIFICATE),	"SSL3_GET_CLIENT_CERTIFICATE"},
 {ERR_FUNC(SSL_F_SSL3_GET_CLIENT_HELLO),	"SSL3_GET_CLIENT_HELLO"},
 {ERR_FUNC(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE),	"SSL3_GET_CLIENT_KEY_EXCHANGE"},
@@ -170,6 +171,7 @@
 {ERR_FUNC(SSL_F_SSL3_READ_BYTES),	"SSL3_READ_BYTES"},
 {ERR_FUNC(SSL_F_SSL3_READ_N),	"SSL3_READ_N"},
 {ERR_FUNC(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST),	"SSL3_SEND_CERTIFICATE_REQUEST"},
+{ERR_FUNC(SSL_F_SSL3_SEND_CHANNEL_ID),	"SSL3_SEND_CHANNEL_ID"},
 {ERR_FUNC(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE),	"SSL3_SEND_CLIENT_CERTIFICATE"},
 {ERR_FUNC(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE),	"SSL3_SEND_CLIENT_KEY_EXCHANGE"},
 {ERR_FUNC(SSL_F_SSL3_SEND_CLIENT_VERIFY),	"SSL3_SEND_CLIENT_VERIFY"},
@@ -338,12 +340,15 @@
 {ERR_REASON(SSL_R_BIO_NOT_SET)           ,"bio not set"},
 {ERR_REASON(SSL_R_BLOCK_CIPHER_PAD_IS_WRONG),"block cipher pad is wrong"},
 {ERR_REASON(SSL_R_BN_LIB)                ,"bn lib"},
+{ERR_REASON(SSL_R_CANNOT_SERIALIZE_PUBLIC_KEY),"cannot serialize public key"},
 {ERR_REASON(SSL_R_CA_DN_LENGTH_MISMATCH) ,"ca dn length mismatch"},
 {ERR_REASON(SSL_R_CA_DN_TOO_LONG)        ,"ca dn too long"},
 {ERR_REASON(SSL_R_CCS_RECEIVED_EARLY)    ,"ccs received early"},
 {ERR_REASON(SSL_R_CERTIFICATE_VERIFY_FAILED),"certificate verify failed"},
 {ERR_REASON(SSL_R_CERT_LENGTH_MISMATCH)  ,"cert length mismatch"},
 {ERR_REASON(SSL_R_CHALLENGE_IS_DIFFERENT),"challenge is different"},
+{ERR_REASON(SSL_R_CHANNEL_ID_NOT_P256)   ,"channel id not p256"},
+{ERR_REASON(SSL_R_CHANNEL_ID_SIGNATURE_INVALID),"Channel ID signature invalid"},
 {ERR_REASON(SSL_R_CIPHER_CODE_WRONG_LENGTH),"cipher code wrong length"},
 {ERR_REASON(SSL_R_CIPHER_OR_HASH_UNAVAILABLE),"cipher or hash unavailable"},
 {ERR_REASON(SSL_R_CIPHER_TABLE_SRC_ERROR),"cipher table src error"},
@@ -356,6 +361,7 @@
 {ERR_REASON(SSL_R_CONNECTION_ID_IS_DIFFERENT),"connection id is different"},
 {ERR_REASON(SSL_R_CONNECTION_TYPE_NOT_SET),"connection type not set"},
 {ERR_REASON(SSL_R_COOKIE_MISMATCH)       ,"cookie mismatch"},
+{ERR_REASON(SSL_R_D2I_ECDSA_SIG)         ,"d2i ecdsa sig"},
 {ERR_REASON(SSL_R_DATA_BETWEEN_CCS_AND_FINISHED),"data between ccs and finished"},
 {ERR_REASON(SSL_R_DATA_LENGTH_TOO_LONG)  ,"data length too long"},
 {ERR_REASON(SSL_R_DECRYPTION_FAILED)     ,"decryption failed"},
@@ -373,9 +379,12 @@
 {ERR_REASON(SSL_R_ENCRYPTED_LENGTH_TOO_LONG),"encrypted length too long"},
 {ERR_REASON(SSL_R_ERROR_GENERATING_TMP_RSA_KEY),"error generating tmp rsa key"},
 {ERR_REASON(SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST),"error in received cipher list"},
+{ERR_REASON(SSL_R_EVP_DIGESTSIGNFINAL_FAILED),"evp digestsignfinal failed"},
+{ERR_REASON(SSL_R_EVP_DIGESTSIGNINIT_FAILED),"evp digestsigninit failed"},
 {ERR_REASON(SSL_R_EXCESSIVE_MESSAGE_SIZE),"excessive message size"},
 {ERR_REASON(SSL_R_EXTRA_DATA_IN_MESSAGE) ,"extra data in message"},
 {ERR_REASON(SSL_R_GOT_A_FIN_BEFORE_A_CCS),"got a fin before a ccs"},
+{ERR_REASON(SSL_R_GOT_CHANNEL_ID_BEFORE_A_CCS),"got Channel ID before a ccs"},
 {ERR_REASON(SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS),"got next proto before a ccs"},
 {ERR_REASON(SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION),"got next proto without seeing extension"},
 {ERR_REASON(SSL_R_HTTPS_PROXY_REQUEST)   ,"https proxy request"},
@@ -385,6 +394,7 @@
 {ERR_REASON(SSL_R_INVALID_CHALLENGE_LENGTH),"invalid challenge length"},
 {ERR_REASON(SSL_R_INVALID_COMMAND)       ,"invalid command"},
 {ERR_REASON(SSL_R_INVALID_COMPRESSION_ALGORITHM),"invalid compression algorithm"},
+{ERR_REASON(SSL_R_INVALID_MESSAGE)       ,"invalid message"},
 {ERR_REASON(SSL_R_INVALID_PURPOSE)       ,"invalid purpose"},
 {ERR_REASON(SSL_R_INVALID_SRP_USERNAME)  ,"invalid srp username"},
 {ERR_REASON(SSL_R_INVALID_STATUS_RESPONSE),"invalid status response"},
@@ -439,6 +449,7 @@
 {ERR_REASON(SSL_R_NO_COMPRESSION_SPECIFIED),"no compression specified"},
 {ERR_REASON(SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER),"Peer haven't sent GOST certificate, required for selected ciphersuite"},
 {ERR_REASON(SSL_R_NO_METHOD_SPECIFIED)   ,"no method specified"},
+{ERR_REASON(SSL_R_NO_P256_SUPPORT)       ,"no p256 support"},
 {ERR_REASON(SSL_R_NO_PRIVATEKEY)         ,"no privatekey"},
 {ERR_REASON(SSL_R_NO_PRIVATE_KEY_ASSIGNED),"no private key assigned"},
 {ERR_REASON(SSL_R_NO_PROTOCOLS_AVAILABLE),"no protocols available"},
diff -ur openssl/ssl/ssl_lib.c openssl.channelid/ssl/ssl_lib.c
--- openssl/ssl/ssl_lib.c	2012-08-28 16:04:21.183349508 -0400
+++ openssl.channelid/ssl/ssl_lib.c	2012-08-29 16:19:55.815717788 -0400
@@ -562,6 +562,8 @@
 		sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids, OCSP_RESPID_free);
 	if (s->tlsext_ocsp_resp)
 		OPENSSL_free(s->tlsext_ocsp_resp);
+	if (s->tlsext_channel_id_private)
+		EVP_PKEY_free(s->tlsext_channel_id_private);
 #endif
 
 	if (s->client_CA != NULL)
@@ -1946,6 +1948,11 @@
 		ssl_buf_freelist_free(a->rbuf_freelist);
 #endif
 
+#ifndef OPENSSL_NO_TLSEXT
+	if (a->tlsext_channel_id_private)
+		EVP_PKEY_free(a->tlsext_channel_id_private);
+#endif
+
 	OPENSSL_free(a);
 	}
 
diff -ur openssl/ssl/ssl_locl.h openssl.channelid/ssl/ssl_locl.h
--- openssl/ssl/ssl_locl.h	2012-08-28 16:04:21.183349508 -0400
+++ openssl.channelid/ssl/ssl_locl.h	2012-08-28 16:04:40.603618948 -0400
@@ -369,6 +369,7 @@
  * (currently this also goes into algorithm2) */
 #define TLS1_STREAM_MAC 0x04
 
+#define TLSEXT_CHANNEL_ID_SIZE 128
 
 
 /*
@@ -996,6 +997,7 @@
 int ssl3_check_finished(SSL *s);
 # ifndef OPENSSL_NO_NEXTPROTONEG
 int ssl3_send_next_proto(SSL *s);
+int ssl3_send_channel_id(SSL *s);
 # endif
 #endif
 
@@ -1018,6 +1020,7 @@
 #ifndef OPENSSL_NO_NEXTPROTONEG
 int ssl3_get_next_proto(SSL *s);
 #endif
+int ssl3_get_channel_id(SSL *s);
 
 int dtls1_send_hello_request(SSL *s);
 int dtls1_send_server_hello(SSL *s);
@@ -1114,7 +1117,9 @@
 int tls12_get_sigid(const EVP_PKEY *pk);
 const EVP_MD *tls12_get_hash(unsigned char hash_alg);
 
+int tls1_channel_id_hash(EVP_MD_CTX *ctx, SSL *s);
 #endif
+
 EVP_MD_CTX* ssl_replace_hash(EVP_MD_CTX **hash,const EVP_MD *md) ;
 void ssl_clear_hash_ctx(EVP_MD_CTX **hash);
 int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
diff -ur openssl/ssl/t1_lib.c openssl.channelid/ssl/t1_lib.c
--- openssl/ssl/t1_lib.c	2012-08-28 16:04:21.193349647 -0400
+++ openssl.channelid/ssl/t1_lib.c	2012-08-28 16:04:40.603618948 -0400
@@ -649,6 +649,16 @@
 		}
 #endif
 
+	if (s->tlsext_channel_id_enabled)
+		{
+		/* The client advertises an emtpy extension to indicate its
+		 * support for Channel ID. */
+		if (limit - ret - 4 < 0)
+			return NULL;
+		s2n(TLSEXT_TYPE_channel_id,ret);
+		s2n(0,ret);
+		}
+
         if(SSL_get_srtp_profiles(s))
                 {
                 int el;
@@ -855,6 +865,16 @@
 		}
 #endif
 
+	/* If the client advertised support for Channel ID, and we have it
+	 * enabled, then we want to echo it back. */
+	if (s->s3->tlsext_channel_id_valid)
+		{
+		if (limit - ret - 4 < 0)
+			return NULL;
+		s2n(TLSEXT_TYPE_channel_id,ret);
+		s2n(0,ret);
+		}
+
 	if ((extdatalen = ret-p-2)== 0) 
 		return p;
 
@@ -1331,6 +1351,9 @@
 			}
 #endif
 
+		else if (type == TLSEXT_TYPE_channel_id && s->tlsext_channel_id_enabled)
+			s->s3->tlsext_channel_id_valid = 1;
+
 		/* session ticket processed earlier */
 		else if (type == TLSEXT_TYPE_use_srtp)
                         {
@@ -1558,6 +1581,9 @@
 			s->s3->next_proto_neg_seen = 1;
 			}
 #endif
+		else if (type == TLSEXT_TYPE_channel_id)
+			s->s3->tlsext_channel_id_valid = 1;
+
 		else if (type == TLSEXT_TYPE_renegotiate)
 			{
 			if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
@@ -2580,3 +2606,37 @@
 	return ret;
 	}
 #endif
+
+#if !defined(OPENSSL_NO_TLSEXT)
+/* tls1_channel_id_hash calculates the signed data for a Channel ID on the given
+ * SSL connection and writes it to |md|.
+ */
+int
+tls1_channel_id_hash(EVP_MD_CTX *md, SSL *s)
+	{
+	EVP_MD_CTX ctx;
+	unsigned char temp_digest[EVP_MAX_MD_SIZE];
+	unsigned temp_digest_len;
+	int i;
+	static const char kClientIDMagic[] = "TLS Channel ID signature";
+
+	if (s->s3->handshake_buffer)
+		if (!ssl3_digest_cached_records(s))
+			return 0;
+
+	EVP_DigestUpdate(md, kClientIDMagic, sizeof(kClientIDMagic));
+
+	EVP_MD_CTX_init(&ctx);
+	for (i = 0; i < SSL_MAX_DIGEST; i++)
+		{
+		if (s->s3->handshake_dgst[i] == NULL)
+			continue;
+		EVP_MD_CTX_copy_ex(&ctx, s->s3->handshake_dgst[i]);
+		EVP_DigestFinal_ex(&ctx, temp_digest, &temp_digest_len);
+		EVP_DigestUpdate(md, temp_digest, temp_digest_len);
+		}
+	EVP_MD_CTX_cleanup(&ctx);
+
+	return 1;
+	}
+#endif
diff -ur openssl/ssl/tls1.h openssl.channelid/ssl/tls1.h
--- openssl/ssl/tls1.h	2012-08-28 16:04:21.193349647 -0400
+++ openssl.channelid/ssl/tls1.h	2012-08-28 16:04:40.603618948 -0400
@@ -248,6 +248,9 @@
 #define TLSEXT_TYPE_next_proto_neg		13172
 #endif
 
+/* This is not an IANA defined extension number */
+#define TLSEXT_TYPE_channel_id			30031
+
 /* NameType value from RFC 3546 */
 #define TLSEXT_NAMETYPE_host_name 0
 /* status request value from RFC 3546 */