1 files changed, 28 insertions, 0 deletions
diff --git a/rsa/pem.py b/rsa/pem.py
index a06d59f..3f0ea76 100644
--- a/rsa/pem.py
+++ b/rsa/pem.py
@@ -58,3 +58,31 @@ def load_pem(contents, pem_start, pem_end):
     pem = ''.join(pem_lines)
     return base64.decodestring(pem)
 
+def save_pem(contents, pem_start, pem_end):
+    '''Saves a PEM file.
+
+    The PEM file will start with the 'pem_start' marker, then the
+    base64-encoded content, and end with the 'pem_end' marker.
+
+    @param contents: the contents to encode in PEM format
+    @param pem_start: the start marker of the PEM content, such as
+        '-----BEGIN RSA PRIVATE KEY-----'
+    @param pem_end: the end marker of the PEM content, such as
+        '-----END RSA PRIVATE KEY-----'
+
+    @return the base64-encoded content between the start and end markers.
+
+    '''
+
+    b64 = base64.encodestring(contents).strip()
+    pem_lines = [pem_start]
+    
+    for block_start in range(0, len(b64), 64):
+        block = b64[block_start:block_start + 64]
+        pem_lines.append(block)
+
+    pem_lines.append(pem_end)
+    pem_lines.append('')
+
+    return '\n'.join(pem_lines)
+