diff --git a/auth.h b/auth.h
index 9279619..2063cad 100644
--- a/auth.h
+++ b/auth.h
@@ -125,6 +125,7 @@ struct AuthState {
 	char *pw_passwd;
 #if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 	struct PubKeyOptions* pubkey_options;
+	char *pubkey_info;
 #endif
 };
 
diff --git a/svr-authpubkey.c b/svr-authpubkey.c
index a33cc39..70e7f70 100644
--- a/svr-authpubkey.c
+++ b/svr-authpubkey.c
@@ -261,7 +261,7 @@ static int checkpubkey_line(buffer* line, int line_num, const char* filename,
 		const char* algo, unsigned int algolen,
 		const unsigned char* keyblob, unsigned int keybloblen) {
 	buffer *options_buf = NULL;
-	unsigned int pos, len;
+	unsigned int pos, len, infopos, infolen;
 	int ret = DROPBEAR_FAILURE;
 
 	if (line->len < MIN_AUTHKEYS_LINE || line->len > MAX_AUTHKEYS_LINE) {
@@ -344,6 +344,11 @@ static int checkpubkey_line(buffer* line, int line_num, const char* filename,
 	for (len = 0; line->pos < line->len; len++) {
 		if (buf_getbyte(line) == ' ') break;
 	}	
+	/* findout the length of the public key info */
+	infopos = line->pos;
+	for (infolen = 0; line->pos < line->len; infolen++) {
+		if (buf_getbyte(line) == ' ') break;
+	}
 	buf_setpos(line, pos);
 	buf_setlen(line, line->pos + len);
 
@@ -351,8 +356,23 @@ static int checkpubkey_line(buffer* line, int line_num, const char* filename,
 
 	ret = cmp_base64_key(keyblob, keybloblen, (const unsigned char *) algo, algolen, line, NULL);
 
-	if (ret == DROPBEAR_SUCCESS && options_buf) {
-		ret = svr_add_pubkey_options(options_buf, line_num, filename);
+	/* free pubkey_info if it is filled */
+	if (ses.authstate.pubkey_info) {
+		m_free(ses.authstate.pubkey_info);
+		ses.authstate.pubkey_info = NULL;
+	}
+	if (ret == DROPBEAR_SUCCESS) {
+		if (options_buf) {
+			ret = svr_add_pubkey_options(options_buf, line_num, filename);
+		}
+		/* save the (optional) public key information */
+		if (infolen) {
+			ses.authstate.pubkey_info = m_malloc(infolen + 1);
+			if (ses.authstate.pubkey_info) {
+		                strncpy(ses.authstate.pubkey_info,(const char *) buf_getptr(line, infopos), infolen);
+				ses.authstate.pubkey_info[infolen]='\0';
+			}
+		}
 	}
 
 out:
diff --git a/svr-authpubkeyoptions.c b/svr-authpubkeyoptions.c
index 7ddf680..447f4b7 100644
--- a/svr-authpubkeyoptions.c
+++ b/svr-authpubkeyoptions.c
@@ -115,6 +115,9 @@ void svr_pubkey_options_cleanup() {
 		}
 		m_free(ses.authstate.pubkey_options);
 	}
+	if (ses.authstate.pubkey_info) {
+		m_free(ses.authstate.pubkey_info);
+	}
 }
 
 /* helper for svr_add_pubkey_options. returns DROPBEAR_SUCCESS if the option is matched,
diff --git a/svr-chansession.c b/svr-chansession.c
index 02cb035..71e0e46 100644
--- a/svr-chansession.c
+++ b/svr-chansession.c
@@ -1030,6 +1030,9 @@ static void execchild(const void *user_data) {
 	if (chansess->original_command) {
 		addnewvar("SSH_ORIGINAL_COMMAND", chansess->original_command);
 	}
+        if (ses.authstate.pubkey_info != NULL) {
+                addnewvar("SSH_PUBKEYINFO", ses.authstate.pubkey_info);
+        }
 
 	/* change directory */
 	if (chdir(ses.authstate.pw_dir) < 0) {