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c212166171
Add pk_write test cases where the ASN.1 INTEGER encoding of the private value would not have the mandatory size for the OCTET STRING that contains the value. ec_256_long_prv.pem is a random secp256r1 private key, selected so that the private value is >= 2^255, i.e. the top bit of the first byte is set (which would cause the INTEGER encoding to have an extra leading 0 byte). ec_521_short_prv.pem is a random secp521r1 private key, selected so that the private value is < 2^519, i.e. the first byte is 0 and the top bit of the second byte is 0 (which would cause the INTEGER encoding to have one less 0 byte at the start).