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(Visual FoxPro) Understanding a few ECDSA Public Key FormatsSee more ECC ExamplesDescribes a few ECDSA public key formats.
LOCAL lnSuccess LOCAL loSbPem LOCAL loPubKey1 LOCAL loSbHex LOCAL lnNumReplaced LOCAL loBdKey LOCAL loPubKey2 * 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: * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbPem = CreateObject('Chilkat.StringBuilder') loSbPem.Append("-----BEGIN PUBLIC KEY-----" + CHR(13) + CHR(10)) loSbPem.Append("MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET" + CHR(13) + CHR(10)) loSbPem.Append("Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw==" + CHR(13) + CHR(10)) loSbPem.Append("-----END PUBLIC KEY-----" + CHR(13) + CHR(10)) * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PublicKey') loPubKey1 = CreateObject('Chilkat.PublicKey') lnSuccess = loPubKey1.LoadFromString(loSbPem.GetAsString()) IF (lnSuccess = 0) THEN ? loPubKey1.LastErrorText RELEASE loSbPem RELEASE loPubKey1 CANCEL ENDIF * The X9.63 format can be loaded like this: * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbHex = CreateObject('Chilkat.StringBuilder') loSbHex.Append("04:5d:1a:4f:d9:bd:49:9e:e4:fd:55:2c:0d:ea:6d:") loSbHex.Append("b1:66:64:7a:71:91:13:63:86:fe:ca:94:d4:47:51:") loSbHex.Append("39:66:ff:43:d5:62:de:f2:f2:41:3c:2e:3f:95:18:") loSbHex.Append("2d:23:f7:e7:8e:75:19:3b:c6:50:fb:d9:90:f5:e8:") loSbHex.Append("12:b7:b8:6a:43") * Get rid of the ":" chars. lnNumReplaced = loSbHex.Replace(":","") * We'll need to convert hex to base64.. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData') loBdKey = CreateObject('Chilkat.BinData') loBdKey.AppendEncoded(loSbHex.GetAsString(),"hex") * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.PublicKey') loPubKey2 = CreateObject('Chilkat.PublicKey') lnSuccess = loPubKey2.LoadFromString(loBdKey.GetEncoded("base64")) IF (lnSuccess = 0) THEN ? loPubKey2.LastErrorText RELEASE loSbPem RELEASE loPubKey1 RELEASE loSbHex RELEASE loBdKey RELEASE loPubKey2 CANCEL ENDIF * Let's get the key in pubKey2 as PEM. * It should be idential to the PEM above. ? loPubKey2.GetPem(1) * 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----- RELEASE loSbPem RELEASE loPubKey1 RELEASE loSbHex RELEASE loBdKey RELEASE loPubKey2 |
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