This function will return the public key algorithm of an X.509
If bits is non null, it should have enough size to hold the
parameters size in bits. For RSA the bits returned is the modulus.
For DSA the bits returned are of the public exponent.
Unknown/unsupported algorithms are mapped to GNUTLS_PK_UNKNOWN.
This page is part of the GnuTLS (GnuTLS Transport Layer Security
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