title: Specification defining ECDSA signature data
body: <p>I want to know what specification (or standard) define the data format of the ECDSA signature and public key?</p>
  
  <p>I'm testing the ECDSA signature on java card. I found out that there is a TLV format in the signature and the public key value.</p>
  
  <pre><code>* Public key (TV format)
  [Tag=04] [public key value 1] [public key value 2]
  04 038A3F59E813995DAB730588CFCBB985F5A1ED90C0D62960AE0B274D 2E6B12672318E0B113DECC0406B62887B6BCB9B1583B1A50779EAB5A
  
  * Signature (TLV format)
  [Tag=30] [Length=3C~3E] [Tag=02] [Length=1C~1D] [signature value 1] [Tag=02] [Length=1C~1D] [signature value 2]
  
  303C 021C 7EEB0B2596F74344B3D7B046EA0BD17C4461FC277658CE93509F1674      021C 4F5DBFB30D994664DA80528847A767F0194876B068E5958161797991
  303E 021D 0080F20B82D407AE663F010F4990F12073631D653EA1D65DC75EBD4293    021D 00880DB667EF51AEA8E7C9BB012496C7C9ECE3BC5829B82B692B9211C3
  303D 021D 00F77447EF326A4A49597D0B839F68F524891F3655DA4561F1AA10EF70    021C 152F7FF18644C5E5C9118736E1F7528F0B10C5FF641C7B7CDF012129
  303D 021D 00A2EBCC5C5981341D0726F2E846CC3879C74EFD64D8698589A8CEAB60    021C 6E04FF884A451D7C0737A182BC2DE7F7D3008EE182B46A009BFFC9E8
  </code></pre>
  
  <p>I think that the data format is defined in some specification or standard. I just want to know the document name.</p>