Description:
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I get this error:

PHP Warning:  openssl_sign(): key type not supported in this PHP build! in /home/mjones/orange.php on line 7


Test script:
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<?php
exec('openssl ecparam -genkey -text -name prime256v1 -out example-ecc.key');
exec('openssl req -new -key example-ecc.key -sha384 -out example-ecc.csr -subj "/C=US/O=x/CN=test"');

$data ='alpha';
$key = openssl_pkey_get_private("file://example-ecc.key");
$res = openssl_sign($data, $sign, $key, 'ecdsa-with-SHA1');
echo base64_encode($sign)."\n";


Expected result:
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MEUCIHIqeyYqn0qzFEqAfhS2eJp1RHcHAd6FebfMoadZ3oRyAiEArZTEqgtDhCQEinrBWZE2MQ0vvyRyX8MmspPGK0ZQ+wg=

Actual result:
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PHP Warning:  openssl_sign(): key type not supported in this PHP build! in /home/mjones/orange.php on line 7
MEUCIHIqeyYqn0qzFEqAfhS2eJp1RHcHAd6FebfMoadZ3oRyAiEArZTEqgtDhCQEinrBWZE2MQ0vvyRyX8MmspPGK0ZQ+wg=