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openssl/doc/crypto/EVP_DigestInit.pod

 =pod
 
 =head1 NAME
 
 EVP_MD_CTX_init, EVP_MD_CTX_create, EVP_DigestInit_ex, EVP_DigestUpdate,
 EVP_DigestFinal_ex, EVP_MD_CTX_cleanup, EVP_MD_CTX_destroy, EVP_MAX_MD_SIZE,
 EVP_MD_CTX_copy_ex, EVP_MD_CTX_copy, EVP_MD_type, EVP_MD_pkey_type, EVP_MD_size,
 EVP_MD_block_size, EVP_MD_CTX_md, EVP_MD_CTX_size, EVP_MD_CTX_block_size, EVP_MD_CTX_type,
 EVP_md_null, EVP_md2, EVP_md5, EVP_sha, EVP_sha1, EVP_dss, EVP_dss1, EVP_mdc2,
 EVP_ripemd160, EVP_get_digestbyname, EVP_get_digestbynid, EVP_get_digestbyobj -
@@ skipping 114 matching lines @@
 EVP_MD_pkey_type() returns the NID of the public key signing algorithm associated
 with this digest. For example EVP_sha1() is associated with RSA so this will
 return B<NID_sha1WithRSAEncryption>. This "link" between digests and signature
 algorithms may not be retained in future versions of OpenSSL.
 
 EVP_md2(), EVP_md5(), EVP_sha(), EVP_sha1(), EVP_mdc2() and EVP_ripemd160()
 return B<EVP_MD> structures for the MD2, MD5, SHA, SHA1, MDC2 and RIPEMD160 digest
 algorithms respectively. The associated signature algorithm is RSA in each case.
 
 EVP_dss() and EVP_dss1() return B<EVP_MD> structures for SHA and SHA1 digest
-algorithms but using DSS (DSA) for the signature algorithm.
+algorithms but using DSS (DSA) for the signature algorithm. Note: there is 
+no need to use these pseudo-digests in OpenSSL 1.0.0 and later, they are
+however retained for compatibility.
 
 EVP_md_null() is a "null" message digest that does nothing: i.e. the hash it
 returns is of zero length.
 
 EVP_get_digestbyname(), EVP_get_digestbynid() and EVP_get_digestbyobj()
 return an B<EVP_MD> structure when passed a digest name, a digest NID or
 an ASN1_OBJECT structure respectively. The digest table must be initialized
 using, for example, OpenSSL_add_all_digests() for these functions to work.
 
 =head1 RETURN VALUES
@@ skipping 75 matching lines @@
  EVP_DigestUpdate(&mdctx, mess1, strlen(mess1));
  EVP_DigestUpdate(&mdctx, mess2, strlen(mess2));
  EVP_DigestFinal_ex(&mdctx, md_value, &md_len);
  EVP_MD_CTX_cleanup(&mdctx);
 
  printf("Digest is: ");
  for(i = 0; i < md_len; i++) printf("%02x", md_value[i]);
  printf("\n");
  }
 
-=head1 BUGS
-
-The link between digests and signing algorithms results in a situation where
-EVP_sha1() must be used with RSA and EVP_dss1() must be used with DSS
-even though they are identical digests.
-
 =head1 SEE ALSO
 
 L<evp(3)|evp(3)>, L<hmac(3)|hmac(3)>, L<md2(3)|md2(3)>,
 L<md5(3)|md5(3)>, L<mdc2(3)|mdc2(3)>, L<ripemd(3)|ripemd(3)>,
 L<sha(3)|sha(3)>, L<dgst(1)|dgst(1)>
 
 =head1 HISTORY
 
 EVP_DigestInit(), EVP_DigestUpdate() and EVP_DigestFinal() are
 available in all versions of SSLeay and OpenSSL.
 
 EVP_MD_CTX_init(), EVP_MD_CTX_create(), EVP_MD_CTX_copy_ex(),
 EVP_MD_CTX_cleanup(), EVP_MD_CTX_destroy(), EVP_DigestInit_ex()
 and EVP_DigestFinal_ex() were added in OpenSSL 0.9.7.
 
 EVP_md_null(), EVP_md2(), EVP_md5(), EVP_sha(), EVP_sha1(),
 EVP_dss(), EVP_dss1(), EVP_mdc2() and EVP_ripemd160() were
 changed to return truely const EVP_MD * in OpenSSL 0.9.7.
 
+The link between digests and signing algorithms was fixed in OpenSSL 1.0 and
+later, so now EVP_sha1() can be used with RSA and DSA, there is no need to
+use EVP_dss1() any more.
+
+OpenSSL 1.0 and later does not include the MD2 digest algorithm in the
+default configuration due to its security weaknesses.
+
 =cut