1 files changed, 142 insertions, 0 deletions
diff --git a/lib/libsecureboot/openpgp/dearmor.c b/lib/libsecureboot/openpgp/dearmor.c
new file mode 100644
index 000000000000..452722ff1a10
--- /dev/null
+++ b/lib/libsecureboot/openpgp/dearmor.c
@@ -0,0 +1,142 @@
+/*-
+ * Copyright (c) 2018, Juniper Networks, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#define NEED_BRSSL_H
+#include <libsecureboot.h>
+#include <brssl.h>
+
+#include "decode.h"
+
+/**
+ * @brief decode ascii armor
+ *
+ * once we get rid of the trailing checksum
+ * we can treat as PEM.
+ *
+ * @sa rfc4880:6.2
+ */
+unsigned char *
+dearmor(char *pem, size_t nbytes, size_t *len)
+{
+#ifdef USE_BEARSSL
+	pem_object *po;
+	size_t npo;
+#else
+	BIO *bp;
+	char *name = NULL;
+	char *header = NULL;
+#endif
+	unsigned char *data = NULL;
+	char *cp;
+	char *ep;
+
+	/* we need to remove the Armor tail */
+	if ((cp = strstr((char *)pem, "\n=")) &&
+	    (ep = strstr(cp, "\n---"))) {
+		memmove(cp, ep, nbytes - (size_t)(ep - pem));
+		nbytes -= (size_t)(ep - cp);
+		pem[nbytes] = '\0';
+	}
+#ifdef USE_BEARSSL
+	/* we also need to remove any headers */
+	if ((cp = strstr((char *)pem, "---\n")) &&
+	    (ep = strstr(cp, "\n\n"))) {
+		cp += 4;
+		ep += 2;
+		memmove(cp, ep, nbytes - (size_t)(ep - pem));
+		nbytes -= (size_t)(ep - cp);
+		pem[nbytes] = '\0';
+	}
+	if ((po = decode_pem(pem, nbytes, &npo))) {
+		data = po->data;
+		*len = po->data_len;
+	}
+#else
+	if ((bp = BIO_new_mem_buf(pem, (int)nbytes))) {
+		long llen = (long)nbytes;
+
+		if (!PEM_read_bio(bp, &name, &header, &data, &llen))
+			data = NULL;
+		BIO_free(bp);
+		*len = (size_t)llen;
+	}
+#endif
+	return (data);
+}
+
+#ifdef MAIN_DEARMOR
+#include <unistd.h>
+#include <fcntl.h>
+#include <err.h>
+
+/*
+ * Mostly a unit test.
+ */
+int
+main(int argc, char *argv[])
+{
+	const char *infile, *outfile;
+	unsigned char *data;
+	size_t n, x;
+	int fd;
+	int o;
+
+	infile = outfile = NULL;
+	while ((o = getopt(argc, argv, "i:o:")) != -1) {
+		switch (o) {
+		case 'i':
+			infile = optarg;
+			break;
+		case 'o':
+			outfile = optarg;
+			break;
+		default:
+			errx(1, "unknown option: -%c", o);
+		}
+	}
+	if (!infile)
+		errx(1, "need -i infile");
+	if (outfile) {
+		if ((fd = open(outfile, O_WRONLY|O_CREAT|O_TRUNC)) < 0)
+			err(1, "cannot open %s", outfile);
+	} else {
+		fd = 1;			/* stdout */
+	}
+	data = read_file(infile, &n);
+	if (!(data[0] & OPENPGP_TAG_ISTAG))
+		data = dearmor(data, n, &n);
+	for (x = 0; x < n; ) {
+		o = write(fd, &data[x], (n - x));
+		if (o < 0)
+			err(1, "cannot write");
+		x += o;
+	}
+	if (fd != 1)
+		close(fd);
+	free(data);
+	return (0);
+}
+#endif