Expose informational encryption details.

2 files changed, 46 insertions, 0 deletions

diff --git a/pdf/mupdf.h b/pdf/mupdf.h
index 428bd7e9..d9d6355d 100644
--- a/pdf/mupdf.h
+++ b/pdf/mupdf.h
@@ -128,6 +128,11 @@ int pdf_needs_password(pdf_xref *xref);
 int pdf_authenticate_password(pdf_xref *xref, char *pw);
 int pdf_has_permission(pdf_xref *xref, int p);
 
+int pdf_get_crypt_revision(pdf_xref *xref);
+char *pdf_get_crypt_method(pdf_xref *xref);
+int pdf_get_crypt_length(pdf_xref *xref);
+unsigned char *pdf_get_crypt_key(pdf_xref *xref);
+
 void pdf_debug_crypt(pdf_crypt *crypt);
 
 /*
diff --git a/pdf/pdf_crypt.c b/pdf/pdf_crypt.c
index edd3e985..e1243d24 100644
--- a/pdf/pdf_crypt.c
+++ b/pdf/pdf_crypt.c
@@ -609,6 +609,47 @@ pdf_has_permission(pdf_xref *xref, int p)
 	return xref->crypt->p & p;
 }
 
+unsigned char *
+pdf_get_crypt_key(pdf_xref *xref)
+{
+	if (xref->crypt)
+		return xref->crypt->key;
+	return NULL;
+}
+
+int
+pdf_get_crypt_revision(pdf_xref *xref)
+{
+	if (xref->crypt)
+		return xref->crypt->v;
+	return 0;
+}
+
+char *
+pdf_get_crypt_method(pdf_xref *xref)
+{
+	if (xref->crypt)
+	{
+		switch (xref->crypt->strf.method)
+		{
+		case PDF_CRYPT_NONE: return "None";
+		case PDF_CRYPT_RC4: return "RC4";
+		case PDF_CRYPT_AESV2: return "AES";
+		case PDF_CRYPT_AESV3: return "AES";
+		case PDF_CRYPT_UNKNOWN: return "Unknown";
+		}
+	}
+	return "None";
+}
+
+int
+pdf_get_crypt_length(pdf_xref *xref)
+{
+	if (xref->crypt)
+		return xref->crypt->length;
+	return 0;
+}
+
 /*
  * PDF 1.7 algorithm 3.1 and ExtensionLevel 3 algorithm 3.1a
  *