Java.security.InvalidKeyException IOException algid parse error

Question

Hi
i am trying to encrypt message using private key (RSA), when i try to get the private key, for the given key spec, I get error (java.security.InvalidKeyException: IOException : algid parse error, not a sequence
below is he code snippet, error occurs at line no 4
KeyFactory keyFactory;
keyFactory = KeyFactory.getInstance(RSA);
PKCS8EncodedKeySpec privSpec = new PKCS8EncodedKeySpec(encryptionKeyBytes);
privKey = (RSAPrivateKey) keyFactory.generatePrivate(privSpec);
cf = Cipher.getInstance(RSA);
cf.init(Cipher.ENCRYPT_MODE, privKey);
let me know if i am missing something, the key is provide by 3rd party,
Thanks in advance

Answer 1

Hi,
glennlasrado wrote:
Its a valid private key, the same key is used by PHP client and it works,This may be due to PHP handling different key formats for you where your Java code is trying to decode a specific key format. You should try decoding the DER encoded key to see what format it is in.
Here is an example CRT private key from Java. You could pass this through a DER dump tool to see the tags if you are not familiar with DER encoding.
<pre>
30 820155
02 01 00
30 0D
06 09 2A864886F70D010101
05 00
04 82013F
30 82013B
02 01 00
02 41 00917ACA34E71863DDD2A6E9FF52850D88EB2EFF7BA936FF079ECBA0576B412388D12E76C31C09C136A041A7145043470606B7E4CC045BD343739181E1C380DB81
02 03 010001
02 40 7EFFEE9E1850167E8372EB3BD55209EAC945120B66417889B27A98D337F2798D9118564F1B4DB704A0BB2B589F8491D3B4AEA74512031AAEFB3BAB34C5AA0341
02 21 00F2B6B08C77C9100C914BD43E71D514CE52DC9CAF431C679D4274C58E2B0D6205
02 21 0099717E9F6020C0428FF8F002BA29BF339C4AB2F777860FE92D40933ADFBEE04D
02 21 00CF2088D9D6FF86EAB2B3FB94AEA020F9524D62894EC456C82586717139DC59E1
02 20 60E97DBFCB46E427262763EF5504E8EDFFD86E103E3D3DEF57D56127DE090041
02 21 008AEC6D299EAAF5378EEFAAF0043093A47CC0EE336745033225E071EE2393F172
</pre>
Your key file may look like this (the inner sequence of the above):
<pre>
30 82013B
02 01 00
02 41 00917ACA34E71863DDD2A6E9FF52850D88EB2EFF7BA936FF079ECBA0576B412388D12E76C31C09C136A041A7145043470606B7E4CC045BD343739181E1C380DB81
02 03 010001
02 40 7EFFEE9E1850167E8372EB3BD55209EAC945120B66417889B27A98D337F2798D9118564F1B4DB704A0BB2B589F8491D3B4AEA74512031AAEFB3BAB34C5AA0341
02 21 00F2B6B08C77C9100C914BD43E71D514CE52DC9CAF431C679D4274C58E2B0D6205
02 21 0099717E9F6020C0428FF8F002BA29BF339C4AB2F777860FE92D40933ADFBEE04D
02 21 00CF2088D9D6FF86EAB2B3FB94AEA020F9524D62894EC456C82586717139DC59E1
02 20 60E97DBFCB46E427262763EF5504E8EDFFD86E103E3D3DEF57D56127DE090041
02 21 008AEC6D299EAAF5378EEFAAF0043093A47CC0EE336745033225E071EE2393F172
</pre>
These are just the Hex string representations of the key formatted for your readability. There are several Eclipse plugins that can help you view DER encoded streams.
Cheers,
Shane
Edited by: safarmer on Oct 11, 2010 4:55 PM