Added additional properties to getPeerCertificate, now includes subjectAltName, Exponent and Modulus (FOAF+SSL friendly).

Patch written by Nathan,
http://groups.google.com/group/nodejs/browse_thread/thread/1d42da4cb2e51536

src/node_crypto.cc

@@ -63,6 +63,9 @@ using namespace v8;
 static Persistent<String> errno_symbol;
 static Persistent<String> syscall_symbol;
 static Persistent<String> subject_symbol;
+static Persistent<String> subjectaltname_symbol;
+static Persistent<String> modulus_symbol;
+static Persistent<String> exponent_symbol;
 static Persistent<String> issuer_symbol;
 static Persistent<String> valid_from_symbol;
 static Persistent<String> valid_to_symbol;
@@ -1087,6 +1090,46 @@ Handle<Value> Connection::GetPeerCertificate(const Arguments& args) {
     }
     (void) BIO_reset(bio);
 
+    char buf[256];
+    bio = NULL;
+    ASN1_OBJECT *oid;
+    oid = OBJ_txt2obj("2.5.29.17", 1); // OID 2.5.29.17 is Subject AltName
+    int count = 0, j;
+    count = X509_get_ext_count(peer_cert);
+    for (j = 0; j < count; j++) {
+        X509_EXTENSION *ext = X509_get_ext(peer_cert, j);
+        if (OBJ_cmp(ext->object, oid) == 0) {
+            bio = BIO_new(BIO_s_mem());
+            if (X509V3_EXT_print(bio, ext, 0, 0) == 1) {
+                memset(buf, 0, sizeof(buf));
+                BIO_read(bio, buf, sizeof(buf) - 1);
+                info->Set(subjectaltname_symbol, String::New(buf));
+            }
+            BIO_vfree(bio);
+            break;
+        }
+    }
+
+    EVP_PKEY *pkey = NULL;
+    RSA *rsa = NULL;
+    if( NULL != (pkey = X509_get_pubkey(peer_cert))
+        && NULL != (rsa = EVP_PKEY_get1_RSA(pkey)) ) {
+        bio = BIO_new(BIO_s_mem());
+        BN_print(bio, rsa->n);
+        memset(buf, 0, sizeof(buf));
+        BIO_read(bio, buf, sizeof(buf) - 1);
+        info->Set(modulus_symbol, String::New(buf) );
+        BIO_free(bio);
+
+        bio = BIO_new(BIO_s_mem());
+        BN_print(bio, rsa->e);
+        memset(buf, 0, sizeof(buf));
+        BIO_read(bio, buf, sizeof(buf) - 1);
+        info->Set(exponent_symbol, String::New(buf) );
+        BIO_free(bio);
+    }
+    (void) BIO_reset(bio);
+
     ASN1_TIME_print(bio, X509_get_notBefore(peer_cert));
     BIO_get_mem_ptr(bio, &mem);
     info->Set(valid_from_symbol, String::New(mem->data, mem->length));
@@ -3922,6 +3965,9 @@ void InitCrypto(Handle<Object> target) {
   issuer_symbol     = NODE_PSYMBOL("issuer");
   valid_from_symbol = NODE_PSYMBOL("valid_from");
   valid_to_symbol   = NODE_PSYMBOL("valid_to");
+  subjectaltname_symbol = NODE_PSYMBOL("subjectaltname");
+  modulus_symbol        = NODE_PSYMBOL("modulus");
+  exponent_symbol       = NODE_PSYMBOL("exponent");
   fingerprint_symbol   = NODE_PSYMBOL("fingerprint");
   name_symbol       = NODE_PSYMBOL("name");
   version_symbol    = NODE_PSYMBOL("version");

src/node_crypto.h

@@ -32,6 +32,7 @@
 #include <openssl/evp.h>
 #include <openssl/pem.h>
 #include <openssl/x509.h>
+#include <openssl/x509v3.h>
 #include <openssl/hmac.h>
 
 #ifdef OPENSSL_NPN_NEGOTIATED