From 4d607f17ea3eb38ed9f7703afd423f6055c686d4 Mon Sep 17 00:00:00 2001 From: schwarze <> Date: Thu, 3 Nov 2016 09:35:34 +0000 Subject: convert EVP manuals from pod to mdoc --- src/lib/libcrypto/doc/EVP_DigestInit.pod | 277 ------------------------------- 1 file changed, 277 deletions(-) delete mode 100644 src/lib/libcrypto/doc/EVP_DigestInit.pod (limited to 'src/lib/libcrypto/doc/EVP_DigestInit.pod') diff --git a/src/lib/libcrypto/doc/EVP_DigestInit.pod b/src/lib/libcrypto/doc/EVP_DigestInit.pod deleted file mode 100644 index c83dcc736f..0000000000 --- a/src/lib/libcrypto/doc/EVP_DigestInit.pod +++ /dev/null @@ -1,277 +0,0 @@ -=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_sha1, EVP_sha224, EVP_sha256, EVP_sha384, EVP_sha512, EVP_dss, EVP_dss1, -EVP_ripemd160, EVP_get_digestbyname, EVP_get_digestbynid, -EVP_get_digestbyobj, EVP_DigestInit, EVP_DigestFinal - EVP digest routines - -=head1 SYNOPSIS - - #include - - void EVP_MD_CTX_init(EVP_MD_CTX *ctx); - EVP_MD_CTX *EVP_MD_CTX_create(void); - - int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl); - int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt); - int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, - unsigned int *s); - - int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx); - void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx); - - int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in); - - int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type); - int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, - unsigned int *s); - - int EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in); - - #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); - - 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_md_null(void); - const EVP_MD *EVP_md2(void); - const EVP_MD *EVP_md5(void); - const EVP_MD *EVP_sha1(void); - const EVP_MD *EVP_dss(void); - const EVP_MD *EVP_dss1(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)) - -=head1 DESCRIPTION - -The EVP digest routines are a high level interface to message digests. - -EVP_MD_CTX_init() initializes digest context B. - -EVP_MD_CTX_create() allocates, initializes and returns a digest context. - -EVP_DigestInit_ex() sets up digest context B to use a digest -B from ENGINE B. B must be initialized before calling this -function. B will typically be supplied by a function such as EVP_sha1(). -If B is NULL then the default implementation of digest B is used. - -EVP_DigestUpdate() hashes B bytes of data at B into the -digest context B. This function can be called several times on the -same B to hash additional data. - -EVP_DigestFinal_ex() retrieves the digest value from B and places -it in B. If the B parameter is not NULL then the number of -bytes of data written (i.e. the length of the digest) will be written -to the integer at B, at most B bytes will be written. -After calling EVP_DigestFinal_ex() no additional calls to EVP_DigestUpdate() -can be made, but EVP_DigestInit_ex() can be called to initialize a new -digest operation. - -EVP_MD_CTX_cleanup() cleans up digest context B, it should be called -after a digest context is no longer needed. - -EVP_MD_CTX_destroy() cleans up digest context B and frees up the -space allocated to it, it should be called only on a context created -using EVP_MD_CTX_create(). - -EVP_MD_CTX_copy_ex() can be used to copy the message digest state from -B to B. This is useful if large amounts of data are to be -hashed which only differ in the last few bytes. B must be initialized -before calling this function. - -EVP_DigestInit() behaves in the same way as EVP_DigestInit_ex() except -the passed context B does not have to be initialized, and it always -uses the default digest implementation. - -EVP_DigestFinal() is similar to EVP_DigestFinal_ex() except the digest -context B is automatically cleaned up. - -EVP_MD_CTX_copy() is similar to EVP_MD_CTX_copy_ex() except the destination -B does not have to be initialized. - -EVP_MD_size() and EVP_MD_CTX_size() return the size of the message digest -when passed an B or an B structure, i.e. the size of the -hash. - -EVP_MD_block_size() and EVP_MD_CTX_block_size() return the block size of the -message digest when passed an B or an B structure. - -EVP_MD_type() and EVP_MD_CTX_type() return the NID of the OBJECT IDENTIFIER -representing the given message digest when passed an B structure. -For example EVP_MD_type(EVP_sha1()) returns B. This function is -normally used when setting ASN1 OIDs. - -EVP_MD_CTX_md() returns the B structure corresponding to the passed -B. - -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. Since digests and signature -algorithms are no longer linked this function is only retained for -compatibility reasons. - -EVP_md2(), EVP_md5(), EVP_sha1(), EVP_sha224(), EVP_sha256(), EVP_sha384(), -EVP_sha512() and EVP_ripemd160() return B structures for the MD2, MD5, -SHA1, SHA224, SHA256, SHA384, SHA512 and RIPEMD160 digest algorithms -respectively. - -EVP_dss() and EVP_dss1() return B structures for SHA1 digest -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 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 - -EVP_DigestInit_ex(), EVP_DigestUpdate() and EVP_DigestFinal_ex() return 1 for -success and 0 for failure. - -EVP_MD_CTX_copy_ex() returns 1 if successful or 0 for failure. - -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() and -EVP_MD_CTX_block_size() return the digest or block size in bytes. - -EVP_md_null(), EVP_md2(), EVP_md5(), EVP_sha1(), EVP_dss(), -EVP_dss1() and EVP_ripemd160() return pointers to the -corresponding EVP_MD structures. - -EVP_get_digestbyname(), EVP_get_digestbynid() and EVP_get_digestbyobj() -return either an B structure or NULL if an error occurs. - -=head1 NOTES - -The B interface to message digests should almost always be used in -preference to the low level interfaces. This is because the code then becomes -transparent to the digest used and much more flexible. - -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 parameter to EVP_DigestInit_ex() will be -set to NULL to use the default digest implementation. - -The functions EVP_DigestInit(), EVP_DigestFinal() and EVP_MD_CTX_copy() are -obsolete but are retained to maintain compatibility with existing code. New -applications should use EVP_DigestInit_ex(), EVP_DigestFinal_ex() and -EVP_MD_CTX_copy_ex() because they can efficiently reuse a digest context -instead of initializing and cleaning it up on each call and allow non default -implementations of digests to be specified. - -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 -digest name passed on the command line. - - #include - #include - - int - main(int argc, char *argv[]) - { - EVP_MD_CTX *mdctx; - const EVP_MD *md; - const char mess1[] = "Test Message\n"; - const char mess2[] = "Hello World\n"; - unsigned char md_value[EVP_MAX_MD_SIZE]; - int md_len, i; - - OpenSSL_add_all_digests(); - - if (argc <= 1) { - printf("Usage: mdtest digestname\n"); - exit(1); - } - - md = EVP_get_digestbyname(argv[1]); - if (md == NULL) { - printf("Unknown message digest %s\n", argv[1]); - exit(1); - } - - 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]); - printf("\n"); - } - -=head1 SEE ALSO - -L, L, L, -L, L, -L, L - -=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_sha1(), -EVP_dss(), EVP_dss1() 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 -- cgit v1.2.3-55-g6feb