1 files changed, 42 insertions, 0 deletions
diff --git a/python/pyasn1-modules/tools/pkcs1dump.py b/python/pyasn1-modules/tools/pkcs1dump.py
new file mode 100755
index 000000000..d0da82b2f
--- /dev/null
+++ b/python/pyasn1-modules/tools/pkcs1dump.py
@@ -0,0 +1,42 @@
+#!/usr/bin/python
+#
+# Read unencrypted PKCS#1/PKIX-compliant, PEM&DER encoded private keys on
+# stdin, print them pretty and encode back into original wire format.
+# Private keys can be generated with "openssl genrsa|gendsa" commands.
+#
+from pyasn1_modules import rfc2459, rfc2437, pem
+from pyasn1.codec.der import encoder, decoder
+import sys
+
+if len(sys.argv) != 1:
+    print("""Usage:
+$ cat rsakey.pem | %s""" % sys.argv[0])
+    sys.exit(-1)
+    
+cnt = 0
+
+while 1:
+    idx, substrate = pem.readPemBlocksFromFile(sys.stdin, ('-----BEGIN RSA PRIVATE KEY-----', '-----END RSA PRIVATE KEY-----'), ('-----BEGIN DSA PRIVATE KEY-----', '-----END DSA PRIVATE KEY-----') )
+    if not substrate:
+        break
+
+    if idx == 0:
+        asn1Spec = rfc2437.RSAPrivateKey()
+    elif idx == 1:
+        asn1Spec = rfc2459.DSAPrivateKey()
+    else:
+        break
+
+    key, rest = decoder.decode(substrate, asn1Spec=asn1Spec)
+
+    if rest: substrate = substrate[:-len(rest)]
+        
+    print(key.prettyPrint())
+
+    assert encoder.encode(key, defMode=False) == substrate or \
+           encoder.encode(key, defMode=True) == substrate, \
+           'pkcs8 recode fails'
+        
+    cnt = cnt + 1
+ 
+print('*** %s key(s) re/serialized' % cnt)