From 4ab26920b98768df4984f29147150c24b799d8db Mon Sep 17 00:00:00 2001
From: "Andreas M. Antonopoulos" <andreas@antonopoulos.com>
Date: Mon, 2 Jun 2014 15:04:18 -0400
Subject: [PATCH] added python code sample for key and address generation in
 various formats

---
 code/key-to-address-ecc-example.py | 52 ++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 code/key-to-address-ecc-example.py

diff --git a/code/key-to-address-ecc-example.py b/code/key-to-address-ecc-example.py
new file mode 100644
index 00000000..29698579
--- /dev/null
+++ b/code/key-to-address-ecc-example.py
@@ -0,0 +1,52 @@
+import bitcoin
+
+# Generate a random private key
+valid_private_key = False
+while not valid_private_key:
+    private_key = bitcoin.random_key()
+    decoded_private_key = bitcoin.decode_privkey(private_key, 'hex')
+    valid_private_key =  0 < decoded_private_key < bitcoin.N       
+print "Private Key (hex) is: ", private_key
+print "Private Key (decimal) is: ", decoded_private_key
+
+# Convert private key to WIF format
+wif_encoded_private_key = bitcoin.encode_privkey(decoded_private_key, 'wif')
+print "Private Key (WIF) is: ", wif_encoded_private_key
+
+# Add suffix "01" to indicate a compressed private key
+compressed_private_key = private_key + '01'
+print "Private Key Compressed (hex) is: ", compressed_private_key
+
+# Generate a WIF format from the compressed private key (WIF-compressed)
+wif_compressed_private_key = bitcoin.encode_privkey(bitcoin.decode_privkey(compressed_private_key, 'hex'), 'wif')
+print "Private Key (WIF-Compressed) is: ", wif_compressed_private_key
+
+# Multiply the EC generator point G with the private key to get a public key point
+public_key = bitcoin.base10_multiply(bitcoin.G, decoded_private_key)
+print "Public Key (x,y) coordinates is:", public_key
+
+# Encode as hex, prefix 04
+hex_encoded_public_key = bitcoin.encode_pubkey(public_key,'hex')
+print "Public Key (hex) is:", hex_encoded_public_key
+
+# Compress public key, adjust prefix depending on whether y is even or odd
+(public_key_x, public_key_y) = public_key
+if (public_key_y % 2) == 0:
+    compressed_prefix = '02'
+else:
+    compressed_prefix = '03'
+hex_compressed_public_key = compressed_prefix + bitcoin.encode(public_key_x, 16)
+print "Compressed Public Key (hex) is:", hex_compressed_public_key
+
+# Generate bitcoin address from public key
+print "Bitcoin Address (b58check) is:", bitcoin.pubkey_to_address(public_key)
+
+# Generate compressed bitcoin address from compressed public key
+print "Compressed Bitcoin Address (b58check) is:", bitcoin.pubkey_to_address(hex_compressed_public_key)
+
+
+
+
+
+
+