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(PHP Extension) Understanding a few ECDSA Public Key FormatsSee more ECC ExamplesDescribes a few ECDSA public key formats.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // Here we have the output of the following openssl command: openssl ec -in key.pem -pubout -text // Private-Key: (256 bit) // priv: // 0e:63:25:8a:73:3c:71:b6:c0:e7:a3:0f:94:b9:74: // e0:be:bd:46:18:be:40:7e:66:9e:21:99:85:0e:ed: // 87:2d // pub: // 04:5d:1a:4f:d9:bd:49:9e:e4:fd:55:2c:0d:ea:6d: // b1:66:64:7a:71:91:13:63:86:fe:ca:94:d4:47:51: // 39:66:ff:43:d5:62:de:f2:f2:41:3c:2e:3f:95:18: // 2d:23:f7:e7:8e:75:19:3b:c6:50:fb:d9:90:f5:e8: // 12:b7:b8:6a:43 // ASN1 OID: prime256v1 // NIST CURVE: P-256 // writing EC key // -----BEGIN PUBLIC KEY----- // MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET // Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw== // -----END PUBLIC KEY----- // The public key is shown in two different formats. // The first is this: // pub: // 04:5d:1a:4f:d9:bd:49:9e:e4:fd:55:2c:0d:ea:6d: // b1:66:64:7a:71:91:13:63:86:fe:ca:94:d4:47:51: // 39:66:ff:43:d5:62:de:f2:f2:41:3c:2e:3f:95:18: // 2d:23:f7:e7:8e:75:19:3b:c6:50:fb:d9:90:f5:e8: // 12:b7:b8:6a:43 // It is the ANSI X9.63 format. // 65-bytes are the uncompressed public key (04 || X || Y) // This is the same public key, but in PEM format // -----BEGIN PUBLIC KEY----- // MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET // Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw== // -----END PUBLIC KEY----- // It contains ASN.1 that more explicitly identifies the key type. // // SEQUENCE (2 elem) // SEQUENCE (2 elem) // OBJECT IDENTIFIER 1.2.840.10045.2.1 ecPublicKey (ANSI X9.62 public key type) // OBJECT IDENTIFIER 1.2.840.10045.3.1.7 prime256v1 (ANSI X9.62 named elliptic curve) // BIT STRING (520 bit) 000001000101110100011010010011111101100110111101010010011001111011100... // PEM format can be loaded into a Chilkat public key object like this: $sbPem = new CkStringBuilder(); $sbPem->Append('-----BEGIN PUBLIC KEY-----\r\n'); $sbPem->Append('MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET\r\n'); $sbPem->Append('Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw==\r\n'); $sbPem->Append('-----END PUBLIC KEY-----\r\n'); $pubKey1 = new CkPublicKey(); $success = $pubKey1->LoadFromString($sbPem->getAsString()); if ($success == false) { print $pubKey1->lastErrorText() . "\n"; exit; } // The X9.63 format can be loaded like this: $sbHex = new CkStringBuilder(); $sbHex->Append('04:5d:1a:4f:d9:bd:49:9e:e4:fd:55:2c:0d:ea:6d:'); $sbHex->Append('b1:66:64:7a:71:91:13:63:86:fe:ca:94:d4:47:51:'); $sbHex->Append('39:66:ff:43:d5:62:de:f2:f2:41:3c:2e:3f:95:18:'); $sbHex->Append('2d:23:f7:e7:8e:75:19:3b:c6:50:fb:d9:90:f5:e8:'); $sbHex->Append('12:b7:b8:6a:43'); // Get rid of the ":" chars. $numReplaced = $sbHex->Replace(':',''); // We'll need to convert hex to base64.. $bdKey = new CkBinData(); $bdKey->AppendEncoded($sbHex->getAsString(),'hex'); $pubKey2 = new CkPublicKey(); $success = $pubKey2->LoadFromString($bdKey->getEncoded('base64')); if ($success == false) { print $pubKey2->lastErrorText() . "\n"; exit; } // Let's get the key in pubKey2 as PEM. // It should be idential to the PEM above. print $pubKey2->getPem(true) . "\n"; // Here's the output. You can see it's the same as the PEM above.. // -----BEGIN PUBLIC KEY----- // MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET // Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw== // -----END PUBLIC KEY----- ?> |
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