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-
-The Message Digest subroutines.
-
-These routines require "evp.h" to be included.
-
-These functions are a higher level interface to the various message digest
-routines found in this library.  As such, they allow the same code to be
-used to digest via different algorithms with only a change in an initial
-parameter.  They are basically just a front-end to the MD2, MD5, SHA
-and SHA1
-routines.
-
-These routines all take a pointer to the following structure to specify
-which message digest algorithm to use.
-typedef struct evp_md_st
-	{
-	int type;
-	int pkey_type;
-	int md_size;
-	void (*init)();
-	void (*update)();
-	void (*final)();
-
-	int required_pkey_type; /*EVP_PKEY_xxx */
-	int (*sign)();
-	int (*verify)();
-	} EVP_MD;
-
-If additional message digest algorithms are to be supported, a structure of
-this type needs to be declared and populated and then the Digest routines
-can be used with that algorithm.  The type field is the object NID of the
-digest type (read the section on Objects for an explanation).  The pkey_type
-is the Object type to use when the a message digest is generated by there
-routines and then is to be signed with the pkey algorithm.  Md_size is
-the size of the message digest returned.  Init, update
-and final are the relevant functions to perform the message digest function
-by parts.  One reason for specifying the message digest to use via this
-mechanism is that if you only use md5, only the md5 routines will
-be included in you linked program.  If you passed an integer
-that specified which message digest to use, the routine that mapped that
-integer to a set of message digest functions would cause all the message
-digests functions to be link into the code.  This setup also allows new
-message digest functions to be added by the application.
-
-The six message digests defined in this library are
-
-EVP_MD *EVP_md2(void);	/* RSA sign/verify */
-EVP_MD *EVP_md5(void);	/* RSA sign/verify */
-EVP_MD *EVP_sha(void);	/* RSA sign/verify */
-EVP_MD *EVP_sha1(void);	/* RSA sign/verify */
-EVP_MD *EVP_dss(void);	/* DSA sign/verify */
-EVP_MD *EVP_dss1(void);	/* DSA sign/verify */
-
-All the message digest routines take a EVP_MD_CTX pointer as an argument.
-The state of the message digest is kept in this structure.
-
-typedef struct pem_md_ctx_st
-	{
-	EVP_MD *digest;
-	union	{
-		unsigned char base[4]; /* this is used in my library as a
-					* 'pointer' to all union elements
-					* structures. */
-		MD2_CTX md2;
-		MD5_CTX md5;
-		SHA_CTX sha;
-		} md;
-	} EVP_MD_CTX;
-
-The Digest functions are as follows.
-
-void EVP_DigestInit(
-EVP_MD_CTX *ctx,
-EVP_MD *type);
-	This function is used to initialise the EVP_MD_CTX.  The message
-	digest that will associated with 'ctx' is specified by 'type'.
-
-void EVP_DigestUpdate(
-EVP_MD_CTX *ctx,
-unsigned char *data,
-unsigned int cnt);
-	This function is used to pass more data to the message digest
-	function.  'cnt' bytes are digested from 'data'.
-
-void EVP_DigestFinal(
-EVP_MD_CTX *ctx,
-unsigned char *md,
-unsigned int *len);
-	This function finishes the digestion and puts the message digest
-	into 'md'.  The length of the message digest is put into len;
-	EVP_MAX_MD_SIZE is the size of the largest message digest that
-	can be returned from this function.  Len can be NULL if the
-	size of the digest is not required.
-