EVP_PKEY_DSA
EVP_PKEY_DSA2
EVP_PKEY_DSA3
EVP_PKEY_DSA4

EVP_PKEY_RSA
EVP_PKEY_RSA2

valid DSA pkey types
	NID_dsa
	NID_dsaWithSHA
	NID_dsaWithSHA1
	NID_dsaWithSHA1_2

valid RSA pkey types
	NID_rsaEncryption
	NID_rsa

NID_dsaWithSHA	NID_dsaWithSHA			DSA		SHA
NID_dsa		NID_dsaWithSHA1			DSA		SHA1
NID_md2		NID_md2WithRSAEncryption	RSA-pkcs1	MD2
NID_md5		NID_md5WithRSAEncryption	RSA-pkcs1	MD5
NID_mdc2	NID_mdc2WithRSA			RSA-none	MDC2
NID_ripemd160	NID_ripemd160WithRSA		RSA-pkcs1	RIPEMD160
NID_sha		NID_shaWithRSAEncryption	RSA-pkcs1	SHA
NID_sha1	NID_sha1WithRSAEncryption	RSA-pkcs1	SHA1
:w