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    <p>Here is an example of how you can see the actual prime numbers (in hex) behind the encoding for an RSA key. There are similar commands for ECDSA and other keys as well.</p> <pre><code>&gt;openssl genrsa -out key.pem Generating RSA private key, 1024 bit long modulus ..........++++++ ........++++++ e is 65537 (0x10001) &gt;more key.pem -----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQD16SAcS+MFmW2j6XKN2IIxu4Ij9Vqhy/IQDgzEtx9c+3Ojz2Av FsaTnV6mybyWZoGXbElVlk+5ZrevwRkK9cgxJPLbcPvvBRKdfzzbtjVAb8y65fmc eaz2Xmbi0n5H1ksHr8Yo0p8vZqptuGRKlLMK0SzVlE3uNe9z0RQG3VQR7QIDAQAB AoGBALnKz9rxLu3tFNxRpZ4r5XoDrHjUiAxUVWfx5Y2+uXB7/svWA1qwf4nJzViA dP7BJcotI18JuORgCgo8/1m7huq3S7KvGT8PTKihRi1hUI7TdIIJdc4WeV7Ml+PG 5CD6vKGfNKyydigmlD89s6RZ/ijoL3H/YfnEHlEOcZMpBfL1AkEA/uoTEq5vFQn4 p0cO9U0Ly/H8zXzOmIwFNUe02RPX4xnr1jlmO+3eiGsSJcsIx5CA+DNpd5awUq45 7CuOzBjSfwJBAPb1PAVAnr5lh/1E2mu+obhGW1Ce42AdlHxiLXqk6D6bDGmepjrL QayolN+qYAh3BO0mzhEVRT/gquJF8TS9TZMCQE05gFmyenh3MtsKTd/GXYKFZr6h xryz/ofrl0AEIOzt12JotS4Gm9ncBf1pCtnaTxfiC1ttTTFfErEXaQUvp+UCQQDK NOAxOMkCAqZHhUIGqK9H8CvCpmZsg6vZ8JVmb3JOGKwgKyvWxih/FAXZ4WoCZFmf SH+/0xfBhtbEsRof4cSLAkAawArz+s5b3SLfwjXcy2EOQxXGagjkxrht2XreUi/X uCrk2l8h4B38B+i8fim0wV3gr8kItIyeKc7r+jzlqvVe -----END RSA PRIVATE KEY----- &gt;openssl rsa -in key.pem -text Private-Key: (1024 bit) modulus: 00:f5:e9:20:1c:4b:e3:05:99:6d:a3:e9:72:8d:d8: 82:31:bb:82:23:f5:5a:a1:cb:f2:10:0e:0c:c4:b7: 1f:5c:fb:73:a3:cf:60:2f:16:c6:93:9d:5e:a6:c9: bc:96:66:81:97:6c:49:55:96:4f:b9:66:b7:af:c1: 19:0a:f5:c8:31:24:f2:db:70:fb:ef:05:12:9d:7f: 3c:db:b6:35:40:6f:cc:ba:e5:f9:9c:79:ac:f6:5e: 66:e2:d2:7e:47:d6:4b:07:af:c6:28:d2:9f:2f:66: aa:6d:b8:64:4a:94:b3:0a:d1:2c:d5:94:4d:ee:35: ef:73:d1:14:06:dd:54:11:ed publicExponent: 65537 (0x10001) privateExponent: 00:b9:ca:cf:da:f1:2e:ed:ed:14:dc:51:a5:9e:2b: e5:7a:03:ac:78:d4:88:0c:54:55:67:f1:e5:8d:be: b9:70:7b:fe:cb:d6:03:5a:b0:7f:89:c9:cd:58:80: 74:fe:c1:25:ca:2d:23:5f:09:b8:e4:60:0a:0a:3c: ff:59:bb:86:ea:b7:4b:b2:af:19:3f:0f:4c:a8:a1: 46:2d:61:50:8e:d3:74:82:09:75:ce:16:79:5e:cc: 97:e3:c6:e4:20:fa:bc:a1:9f:34:ac:b2:76:28:26: 94:3f:3d:b3:a4:59:fe:28:e8:2f:71:ff:61:f9:c4: 1e:51:0e:71:93:29:05:f2:f5 prime1: 00:fe:ea:13:12:ae:6f:15:09:f8:a7:47:0e:f5:4d: 0b:cb:f1:fc:cd:7c:ce:98:8c:05:35:47:b4:d9:13: d7:e3:19:eb:d6:39:66:3b:ed:de:88:6b:12:25:cb: 08:c7:90:80:f8:33:69:77:96:b0:52:ae:39:ec:2b: 8e:cc:18:d2:7f prime2: 00:f6:f5:3c:05:40:9e:be:65:87:fd:44:da:6b:be: a1:b8:46:5b:50:9e:e3:60:1d:94:7c:62:2d:7a:a4: e8:3e:9b:0c:69:9e:a6:3a:cb:41:ac:a8:94:df:aa: 60:08:77:04:ed:26:ce:11:15:45:3f:e0:aa:e2:45: f1:34:bd:4d:93 exponent1: 4d:39:80:59:b2:7a:78:77:32:db:0a:4d:df:c6:5d: 82:85:66:be:a1:c6:bc:b3:fe:87:eb:97:40:04:20: ec:ed:d7:62:68:b5:2e:06:9b:d9:dc:05:fd:69:0a: d9:da:4f:17:e2:0b:5b:6d:4d:31:5f:12:b1:17:69: 05:2f:a7:e5 exponent2: 00:ca:34:e0:31:38:c9:02:02:a6:47:85:42:06:a8: af:47:f0:2b:c2:a6:66:6c:83:ab:d9:f0:95:66:6f: 72:4e:18:ac:20:2b:2b:d6:c6:28:7f:14:05:d9:e1: 6a:02:64:59:9f:48:7f:bf:d3:17:c1:86:d6:c4:b1: 1a:1f:e1:c4:8b coefficient: 1a:c0:0a:f3:fa:ce:5b:dd:22:df:c2:35:dc:cb:61: 0e:43:15:c6:6a:08:e4:c6:b8:6d:d9:7a:de:52:2f: d7:b8:2a:e4:da:5f:21:e0:1d:fc:07:e8:bc:7e:29: b4:c1:5d:e0:af:c9:08:b4:8c:9e:29:ce:eb:fa:3c: e5:aa:f5:5e </code></pre> <p>If your key is in binary DER format, you can get the same output by using this command:</p> <pre><code>openssl rsa -in key.der -inform DER -text </code></pre>
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