OSSL_PARAM helper functions. Provide a number of functions to allow parameters to be set and retrieved in a type safe manner. Functions are provided for many integral types plus dou
OSSL_PARAM helper functions. Provide a number of functions to allow parameters to be set and retrieved in a type safe manner. Functions are provided for many integral types plus double, BIGNUM, UTF8 strings and OCTET strings. All of the integer functions will widen the parameter data as required. This permits a degree of malleability in the parameter definition. For example a type can be changed from a thirty two bit integer to a sixty four bit one without changing application code. Only four and eight byte integral sizes are supported here. A pair of real functions are available for doubles. A pair of functions is available for BIGNUMs. These accept any sized unsigned integer input and convert to/from a BIGNUM. For each OCTET and UTF8 strings, four functions are defined. This provide get and set functionality for string and for pointers to strings. The latter avoiding copies but have other inherent risks. Finally, some utility macros and functions are defined to allow OSSL_PARAM definition arrays to be specified in a simple manner. There are two macro and one function for most types. The exception being BIGNUM, for which there is one macro and one function. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8451)
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