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_MD_CTX_copy_ex, EVP_DigestInit, EVP_DigestFinal, 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_sha224, EVP_sha256, EVP_sha384, EVP_sha512, EVP_dss, EVP_dss1, EVP_mdc2,
EVP_ripemd160, EVP_get_digestbyname, EVP_get_digestbynid, EVP_get_digestbyobj -
EVP digest routines
int EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in);
- #define EVP_MAX_MD_SIZE (16+20) /* The SSLv3 md5+sha1 type */
+ #define EVP_MAX_MD_SIZE 64 /* SHA512 */
+ int EVP_MD_type(const EVP_MD *md);
+ int EVP_MD_pkey_type(const EVP_MD *md);
+ int EVP_MD_size(const EVP_MD *md);
+ int EVP_MD_block_size(const EVP_MD *md);
- #define EVP_MD_type(e) ((e)->type)
- #define EVP_MD_pkey_type(e) ((e)->pkey_type)
- #define EVP_MD_size(e) ((e)->md_size)
- #define EVP_MD_block_size(e) ((e)->block_size)
-
- #define EVP_MD_CTX_md(e) (e)->digest)
- #define EVP_MD_CTX_size(e) EVP_MD_size((e)->digest)
+ const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx);
+ #define EVP_MD_CTX_size(e) EVP_MD_size(EVP_MD_CTX_md(e))
#define EVP_MD_CTX_block_size(e) EVP_MD_block_size((e)->digest)
#define EVP_MD_CTX_type(e) EVP_MD_type((e)->digest)
const EVP_MD *EVP_mdc2(void);
const EVP_MD *EVP_ripemd160(void);
+ const EVP_MD *EVP_sha224(void);
+ const EVP_MD *EVP_sha256(void);
+ const EVP_MD *EVP_sha384(void);
+ const EVP_MD *EVP_sha512(void);
+
const EVP_MD *EVP_get_digestbyname(const char *name);
#define EVP_get_digestbynid(a) EVP_get_digestbyname(OBJ_nid2sn(a))
#define EVP_get_digestbyobj(a) EVP_get_digestbynid(OBJ_obj2nid(a))
The EVP digest routines are a high level interface to message digests.
-EVP_MD_CTX_init() initializes digest contet B<ctx>.
+EVP_MD_CTX_init() initializes digest context B<ctx>.
-EVP_MD_CTX_create() allocates, initializes and returns a digest contet.
+EVP_MD_CTX_create() allocates, initializes and returns a digest context.
EVP_DigestInit_ex() sets up digest context B<ctx> to use a digest
B<type> from ENGINE B<impl>. B<ctx> must be initialized before calling this
uses the default digest implementation.
EVP_DigestFinal() is similar to EVP_DigestFinal_ex() except the digest
-contet B<ctx> is automatically cleaned up.
+context B<ctx> is automatically cleaned up.
EVP_MD_CTX_copy() is similar to EVP_MD_CTX_copy_ex() except the destination
B<out> does not have to be initialized.
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.
+return B<NID_sha1WithRSAEncryption>. Since digests and signature algorithms
+are no longer linked this function is only retained for compatibility
+reasons.
-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_md2(), EVP_md5(), EVP_sha(), EVP_sha1(), EVP_sha224(), EVP_sha256(),
+EVP_sha384(), EVP_sha512(), EVP_mdc2() and EVP_ripemd160() return B<EVP_MD>
+structures for the MD2, MD5, SHA, SHA1, SHA224, SHA256, SHA384, SHA512, MDC2
+and RIPEMD160 digest algorithms respectively.
EVP_dss() and EVP_dss1() return B<EVP_MD> structures for SHA and SHA1 digest
algorithms but using DSS (DSA) for the signature algorithm. Note: there is
EVP_MD_type(), EVP_MD_pkey_type() and EVP_MD_type() return the NID of the
corresponding OBJECT IDENTIFIER or NID_undef if none exists.
-EVP_MD_size(), EVP_MD_block_size(), EVP_MD_CTX_size(e), EVP_MD_size(),
-EVP_MD_CTX_block_size() and EVP_MD_block_size() return the digest or block
-size in bytes.
+EVP_MD_size(), EVP_MD_block_size(), EVP_MD_CTX_size() and
+EVP_MD_CTX_block_size() return the digest or block size in bytes.
EVP_md_null(), EVP_md2(), EVP_md5(), EVP_sha(), EVP_sha1(), EVP_dss(),
EVP_dss1(), EVP_mdc2() and EVP_ripemd160() return pointers to the
preference to the low level interfaces. This is because the code then becomes
transparent to the digest used and much more flexible.
-SHA1 is the digest of choice for new applications. The other digest algorithms
-are still in common use.
+New applications should use the SHA2 digest algorithms such as SHA256.
+The other digest algorithms are still in common use.
For most applications the B<impl> parameter to EVP_DigestInit_ex() will be
set to NULL to use the default digest implementation.
In OpenSSL 0.9.7 and later if digest contexts are not cleaned up after use
memory leaks will occur.
+Stack allocation of EVP_MD_CTX structures is common, for example:
+
+ EVP_MD_CTX mctx;
+ EVP_MD_CTX_init(&mctx);
+
+This will cause binary compatibility issues if the size of EVP_MD_CTX
+structure changes (this will only happen with a major release of OpenSSL).
+Applications wishing to avoid this should use EVP_MD_CTX_create() instead:
+
+ EVP_MD_CTX *mctx;
+ mctx = EVP_MD_CTX_create();
+
+
=head1 EXAMPLE
This example digests the data "Test Message\n" and "Hello World\n", using the
main(int argc, char *argv[])
{
- EVP_MD_CTX mdctx;
+ EVP_MD_CTX *mdctx;
const EVP_MD *md;
char mess1[] = "Test Message\n";
char mess2[] = "Hello World\n";
exit(1);
}
- EVP_MD_CTX_init(&mdctx);
- EVP_DigestInit_ex(&mdctx, md, NULL);
- 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);
+ mdctx = EVP_MD_CTX_create();
+ EVP_DigestInit_ex(mdctx, md, NULL);
+ EVP_DigestUpdate(mdctx, mess1, strlen(mess1));
+ EVP_DigestUpdate(mdctx, mess2, strlen(mess2));
+ EVP_DigestFinal_ex(mdctx, md_value, &md_len);
+ EVP_MD_CTX_destroy(mdctx);
printf("Digest is: ");
for(i = 0; i < md_len; i++) printf("%02x", md_value[i]);
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.
+changed to return truly 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
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