commit 621113fd3aa56582df49196ce4bf702b0ff7a05a
author Hanno Becker <hanno.becker@arm.com> Tue Jul 23 17:01:13 2019 +0100
committer Hanno Becker <hanno.becker@arm.com> Mon Aug 12 17:05:38 2019 +0100
tree 8ad9dbab0ea81edb930b8a055691efcbb345be18
parent a3c2c1712c0d7befca0091b50cd9bcba52e22bd8

tinyCrypt: Write client's key share

library/ssl_cli.c

diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 44a7bcc..0488f7b 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -3562,9 +3562,13 @@
 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
 #if defined(MBEDTLS_USE_TINYCRYPT)
     if( mbedtls_ssl_suite_get_key_exchange( ciphersuite_info )
-        == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA)
+        == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ||
+        mbedtls_ssl_suite_get_key_exchange( ciphersuite_info )
+        == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA )
     {
         const struct uECC_Curve_t * uecc_curve = uECC_secp256r1();
+        ((void) n);
+        ((void) ret);
 
         if( !uECC_make_key( ssl->handshake->ecdh_ownpubkey,
                             ssl->handshake->ecdh_privkey,
@@ -3573,13 +3577,13 @@
             return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
         }
 
-        /* TODO: Write the client share. */
-        ((void) p);
-        ((void) end);
-        ((void) ret);
-        ((void) n);
+        if( (size_t)( end - p ) < 2 * NUM_ECC_BYTES + 2 )
+            return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
 
-        mbedtls_platform_zeroize( ssl->handshake->ecdh_privkey, NUM_ECC_BYTES );
+        *p++ = 2 * NUM_ECC_BYTES + 1;
+        *p++ = 0x04; /* uncompressed point presentation */
+        memcpy( p, ssl->handshake->ecdh_ownpubkey, 2 * NUM_ECC_BYTES );
+        p += 2 * NUM_ECC_BYTES;
     }
     else
 #elif defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED)   ||              \