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ECDSA signature values and private keys are fixed-length unsigned integers modulo N (the group order of the elliptic curve) and are therefore most naturally represented in ASN.1 using ASN1_OCTET_STRING. Private key representations do use ASN1_OCTET_STRING, but signature values tend to use ASN1_INTEGER, which adds no value but does ensure that the encoding becomes variable-length and requires handling a pointless extra zero byte if the MSB of the unsigned value happens to be set. RSA also makes use of ASN1_INTEGER for modulus and exponent values. Generalise the existing rsa_parse_integer() to asn1_enter_unsigned() to allow this code to be reused for ECDSA. Signed-off-by: Michael Brown <mcb30@ipxe.org>