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| 131 | .rm #[ #] #H #V #F C |
| 132 | .\" ======================================================================== |
| 133 | .\" |
| 134 | .IX Title "EVP_DigestInit 3" |
| 135 | .TH EVP_DigestInit 3 "2009-01-11" "0.9.8j" "OpenSSL" |
| 136 | .\" For nroff, turn off justification. Always turn off hyphenation; it makes |
| 137 | .\" way too many mistakes in technical documents. |
| 138 | .if n .ad l |
| 139 | .nh |
| 140 | .SH "NAME" |
| 141 | EVP_MD_CTX_init, EVP_MD_CTX_create, EVP_DigestInit_ex, EVP_DigestUpdate, |
| 142 | EVP_DigestFinal_ex, EVP_MD_CTX_cleanup, EVP_MD_CTX_destroy, EVP_MAX_MD_SIZE, |
| 143 | EVP_MD_CTX_copy_ex, EVP_MD_CTX_copy, EVP_MD_type, EVP_MD_pkey_type, EVP_MD_size, |
| 144 | EVP_MD_block_size, EVP_MD_CTX_md, EVP_MD_CTX_size, EVP_MD_CTX_block_size, EVP_MD_CTX_type, |
| 145 | EVP_md_null, EVP_md2, EVP_md5, EVP_sha, EVP_sha1, EVP_dss, EVP_dss1, EVP_mdc2, |
| 146 | EVP_ripemd160, EVP_get_digestbyname, EVP_get_digestbynid, EVP_get_digestbyobj \- |
| 147 | EVP digest routines |
| 148 | .SH "SYNOPSIS" |
| 149 | .IX Header "SYNOPSIS" |
| 150 | .Vb 1 |
| 151 | \& #include <openssl/evp.h> |
| 152 | \& |
| 153 | \& void EVP_MD_CTX_init(EVP_MD_CTX *ctx); |
| 154 | \& EVP_MD_CTX *EVP_MD_CTX_create(void); |
| 155 | \& |
| 156 | \& int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl); |
| 157 | \& int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt); |
| 158 | \& int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, |
| 159 | \& unsigned int *s); |
| 160 | \& |
| 161 | \& int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx); |
| 162 | \& void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx); |
| 163 | \& |
| 164 | \& int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in); |
| 165 | \& |
| 166 | \& int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type); |
| 167 | \& int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, |
| 168 | \& unsigned int *s); |
| 169 | \& |
| 170 | \& int EVP_MD_CTX_copy(EVP_MD_CTX *out,EVP_MD_CTX *in); |
| 171 | \& |
| 172 | \& #define EVP_MAX_MD_SIZE (16+20) /* The SSLv3 md5+sha1 type */ |
| 173 | \& |
| 174 | \& |
| 175 | \& #define EVP_MD_type(e) ((e)\->type) |
| 176 | \& #define EVP_MD_pkey_type(e) ((e)\->pkey_type) |
| 177 | \& #define EVP_MD_size(e) ((e)\->md_size) |
| 178 | \& #define EVP_MD_block_size(e) ((e)\->block_size) |
| 179 | \& |
| 180 | \& #define EVP_MD_CTX_md(e) (e)\->digest) |
| 181 | \& #define EVP_MD_CTX_size(e) EVP_MD_size((e)\->digest) |
| 182 | \& #define EVP_MD_CTX_block_size(e) EVP_MD_block_size((e)\->digest) |
| 183 | \& #define EVP_MD_CTX_type(e) EVP_MD_type((e)\->digest) |
| 184 | \& |
| 185 | \& const EVP_MD *EVP_md_null(void); |
| 186 | \& const EVP_MD *EVP_md2(void); |
| 187 | \& const EVP_MD *EVP_md5(void); |
| 188 | \& const EVP_MD *EVP_sha(void); |
| 189 | \& const EVP_MD *EVP_sha1(void); |
| 190 | \& const EVP_MD *EVP_dss(void); |
| 191 | \& const EVP_MD *EVP_dss1(void); |
| 192 | \& const EVP_MD *EVP_mdc2(void); |
| 193 | \& const EVP_MD *EVP_ripemd160(void); |
| 194 | \& |
| 195 | \& const EVP_MD *EVP_get_digestbyname(const char *name); |
| 196 | \& #define EVP_get_digestbynid(a) EVP_get_digestbyname(OBJ_nid2sn(a)) |
| 197 | \& #define EVP_get_digestbyobj(a) EVP_get_digestbynid(OBJ_obj2nid(a)) |
| 198 | .Ve |
| 199 | .SH "DESCRIPTION" |
| 200 | .IX Header "DESCRIPTION" |
| 201 | The \s-1EVP\s0 digest routines are a high level interface to message digests. |
| 202 | .PP |
| 203 | \&\fIEVP_MD_CTX_init()\fR initializes digest contet \fBctx\fR. |
| 204 | .PP |
| 205 | \&\fIEVP_MD_CTX_create()\fR allocates, initializes and returns a digest contet. |
| 206 | .PP |
| 207 | \&\fIEVP_DigestInit_ex()\fR sets up digest context \fBctx\fR to use a digest |
| 208 | \&\fBtype\fR from \s-1ENGINE\s0 \fBimpl\fR. \fBctx\fR must be initialized before calling this |
| 209 | function. \fBtype\fR will typically be supplied by a functionsuch as \fIEVP_sha1()\fR. |
| 210 | If \fBimpl\fR is \s-1NULL\s0 then the default implementation of digest \fBtype\fR is used. |
| 211 | .PP |
| 212 | \&\fIEVP_DigestUpdate()\fR hashes \fBcnt\fR bytes of data at \fBd\fR into the |
| 213 | digest context \fBctx\fR. This function can be called several times on the |
| 214 | same \fBctx\fR to hash additional data. |
| 215 | .PP |
| 216 | \&\fIEVP_DigestFinal_ex()\fR retrieves the digest value from \fBctx\fR and places |
| 217 | it in \fBmd\fR. If the \fBs\fR parameter is not \s-1NULL\s0 then the number of |
| 218 | bytes of data written (i.e. the length of the digest) will be written |
| 219 | to the integer at \fBs\fR, at most \fB\s-1EVP_MAX_MD_SIZE\s0\fR bytes will be written. |
| 220 | After calling \fIEVP_DigestFinal_ex()\fR no additional calls to \fIEVP_DigestUpdate()\fR |
| 221 | can be made, but \fIEVP_DigestInit_ex()\fR can be called to initialize a new |
| 222 | digest operation. |
| 223 | .PP |
| 224 | \&\fIEVP_MD_CTX_cleanup()\fR cleans up digest context \fBctx\fR, it should be called |
| 225 | after a digest context is no longer needed. |
| 226 | .PP |
| 227 | \&\fIEVP_MD_CTX_destroy()\fR cleans up digest context \fBctx\fR and frees up the |
| 228 | space allocated to it, it should be called only on a context created |
| 229 | using \fIEVP_MD_CTX_create()\fR. |
| 230 | .PP |
| 231 | \&\fIEVP_MD_CTX_copy_ex()\fR can be used to copy the message digest state from |
| 232 | \&\fBin\fR to \fBout\fR. This is useful if large amounts of data are to be |
| 233 | hashed which only differ in the last few bytes. \fBout\fR must be initialized |
| 234 | before calling this function. |
| 235 | .PP |
| 236 | \&\fIEVP_DigestInit()\fR behaves in the same way as \fIEVP_DigestInit_ex()\fR except |
| 237 | the passed context \fBctx\fR does not have to be initialized, and it always |
| 238 | uses the default digest implementation. |
| 239 | .PP |
| 240 | \&\fIEVP_DigestFinal()\fR is similar to \fIEVP_DigestFinal_ex()\fR except the digest |
| 241 | contet \fBctx\fR is automatically cleaned up. |
| 242 | .PP |
| 243 | \&\fIEVP_MD_CTX_copy()\fR is similar to \fIEVP_MD_CTX_copy_ex()\fR except the destination |
| 244 | \&\fBout\fR does not have to be initialized. |
| 245 | .PP |
| 246 | \&\fIEVP_MD_size()\fR and \fIEVP_MD_CTX_size()\fR return the size of the message digest |
| 247 | when passed an \fB\s-1EVP_MD\s0\fR or an \fB\s-1EVP_MD_CTX\s0\fR structure, i.e. the size of the |
| 248 | hash. |
| 249 | .PP |
| 250 | \&\fIEVP_MD_block_size()\fR and \fIEVP_MD_CTX_block_size()\fR return the block size of the |
| 251 | message digest when passed an \fB\s-1EVP_MD\s0\fR or an \fB\s-1EVP_MD_CTX\s0\fR structure. |
| 252 | .PP |
| 253 | \&\fIEVP_MD_type()\fR and \fIEVP_MD_CTX_type()\fR return the \s-1NID\s0 of the \s-1OBJECT\s0 \s-1IDENTIFIER\s0 |
| 254 | representing the given message digest when passed an \fB\s-1EVP_MD\s0\fR structure. |
| 255 | For example EVP_MD_type(\fIEVP_sha1()\fR) returns \fBNID_sha1\fR. This function is |
| 256 | normally used when setting \s-1ASN1\s0 OIDs. |
| 257 | .PP |
| 258 | \&\fIEVP_MD_CTX_md()\fR returns the \fB\s-1EVP_MD\s0\fR structure corresponding to the passed |
| 259 | \&\fB\s-1EVP_MD_CTX\s0\fR. |
| 260 | .PP |
| 261 | \&\fIEVP_MD_pkey_type()\fR returns the \s-1NID\s0 of the public key signing algorithm associated |
| 262 | with this digest. For example \fIEVP_sha1()\fR is associated with \s-1RSA\s0 so this will |
| 263 | return \fBNID_sha1WithRSAEncryption\fR. This \*(L"link\*(R" between digests and signature |
| 264 | algorithms may not be retained in future versions of OpenSSL. |
| 265 | .PP |
| 266 | \&\fIEVP_md2()\fR, \fIEVP_md5()\fR, \fIEVP_sha()\fR, \fIEVP_sha1()\fR, \fIEVP_mdc2()\fR and \fIEVP_ripemd160()\fR |
| 267 | return \fB\s-1EVP_MD\s0\fR structures for the \s-1MD2\s0, \s-1MD5\s0, \s-1SHA\s0, \s-1SHA1\s0, \s-1MDC2\s0 and \s-1RIPEMD160\s0 digest |
| 268 | algorithms respectively. The associated signature algorithm is \s-1RSA\s0 in each case. |
| 269 | .PP |
| 270 | \&\fIEVP_dss()\fR and \fIEVP_dss1()\fR return \fB\s-1EVP_MD\s0\fR structures for \s-1SHA\s0 and \s-1SHA1\s0 digest |
| 271 | algorithms but using \s-1DSS\s0 (\s-1DSA\s0) for the signature algorithm. |
| 272 | .PP |
| 273 | \&\fIEVP_md_null()\fR is a \*(L"null\*(R" message digest that does nothing: i.e. the hash it |
| 274 | returns is of zero length. |
| 275 | .PP |
| 276 | \&\fIEVP_get_digestbyname()\fR, \fIEVP_get_digestbynid()\fR and \fIEVP_get_digestbyobj()\fR |
| 277 | return an \fB\s-1EVP_MD\s0\fR structure when passed a digest name, a digest \s-1NID\s0 or |
| 278 | an \s-1ASN1_OBJECT\s0 structure respectively. The digest table must be initialized |
| 279 | using, for example, \fIOpenSSL_add_all_digests()\fR for these functions to work. |
| 280 | .SH "RETURN VALUES" |
| 281 | .IX Header "RETURN VALUES" |
| 282 | \&\fIEVP_DigestInit_ex()\fR, \fIEVP_DigestUpdate()\fR and \fIEVP_DigestFinal_ex()\fR return 1 for |
| 283 | success and 0 for failure. |
| 284 | .PP |
| 285 | \&\fIEVP_MD_CTX_copy_ex()\fR returns 1 if successful or 0 for failure. |
| 286 | .PP |
| 287 | \&\fIEVP_MD_type()\fR, \fIEVP_MD_pkey_type()\fR and \fIEVP_MD_type()\fR return the \s-1NID\s0 of the |
| 288 | corresponding \s-1OBJECT\s0 \s-1IDENTIFIER\s0 or NID_undef if none exists. |
| 289 | .PP |
| 290 | \&\fIEVP_MD_size()\fR, \fIEVP_MD_block_size()\fR, EVP_MD_CTX_size(e), \fIEVP_MD_size()\fR, |
| 291 | \&\fIEVP_MD_CTX_block_size()\fR and \fIEVP_MD_block_size()\fR return the digest or block |
| 292 | size in bytes. |
| 293 | .PP |
| 294 | \&\fIEVP_md_null()\fR, \fIEVP_md2()\fR, \fIEVP_md5()\fR, \fIEVP_sha()\fR, \fIEVP_sha1()\fR, \fIEVP_dss()\fR, |
| 295 | \&\fIEVP_dss1()\fR, \fIEVP_mdc2()\fR and \fIEVP_ripemd160()\fR return pointers to the |
| 296 | corresponding \s-1EVP_MD\s0 structures. |
| 297 | .PP |
| 298 | \&\fIEVP_get_digestbyname()\fR, \fIEVP_get_digestbynid()\fR and \fIEVP_get_digestbyobj()\fR |
| 299 | return either an \fB\s-1EVP_MD\s0\fR structure or \s-1NULL\s0 if an error occurs. |
| 300 | .SH "NOTES" |
| 301 | .IX Header "NOTES" |
| 302 | The \fB\s-1EVP\s0\fR interface to message digests should almost always be used in |
| 303 | preference to the low level interfaces. This is because the code then becomes |
| 304 | transparent to the digest used and much more flexible. |
| 305 | .PP |
| 306 | \&\s-1SHA1\s0 is the digest of choice for new applications. The other digest algorithms |
| 307 | are still in common use. |
| 308 | .PP |
| 309 | For most applications the \fBimpl\fR parameter to \fIEVP_DigestInit_ex()\fR will be |
| 310 | set to \s-1NULL\s0 to use the default digest implementation. |
| 311 | .PP |
| 312 | The functions \fIEVP_DigestInit()\fR, \fIEVP_DigestFinal()\fR and \fIEVP_MD_CTX_copy()\fR are |
| 313 | obsolete but are retained to maintain compatibility with existing code. New |
| 314 | applications should use \fIEVP_DigestInit_ex()\fR, \fIEVP_DigestFinal_ex()\fR and |
| 315 | \&\fIEVP_MD_CTX_copy_ex()\fR because they can efficiently reuse a digest context |
| 316 | instead of initializing and cleaning it up on each call and allow non default |
| 317 | implementations of digests to be specified. |
| 318 | .PP |
| 319 | In OpenSSL 0.9.7 and later if digest contexts are not cleaned up after use |
| 320 | memory leaks will occur. |
| 321 | .SH "EXAMPLE" |
| 322 | .IX Header "EXAMPLE" |
| 323 | This example digests the data \*(L"Test Message\en\*(R" and \*(L"Hello World\en\*(R", using the |
| 324 | digest name passed on the command line. |
| 325 | .PP |
| 326 | .Vb 2 |
| 327 | \& #include <stdio.h> |
| 328 | \& #include <openssl/evp.h> |
| 329 | \& |
| 330 | \& main(int argc, char *argv[]) |
| 331 | \& { |
| 332 | \& EVP_MD_CTX mdctx; |
| 333 | \& const EVP_MD *md; |
| 334 | \& char mess1[] = "Test Message\en"; |
| 335 | \& char mess2[] = "Hello World\en"; |
| 336 | \& unsigned char md_value[EVP_MAX_MD_SIZE]; |
| 337 | \& int md_len, i; |
| 338 | \& |
| 339 | \& OpenSSL_add_all_digests(); |
| 340 | \& |
| 341 | \& if(!argv[1]) { |
| 342 | \& printf("Usage: mdtest digestname\en"); |
| 343 | \& exit(1); |
| 344 | \& } |
| 345 | \& |
| 346 | \& md = EVP_get_digestbyname(argv[1]); |
| 347 | \& |
| 348 | \& if(!md) { |
| 349 | \& printf("Unknown message digest %s\en", argv[1]); |
| 350 | \& exit(1); |
| 351 | \& } |
| 352 | \& |
| 353 | \& EVP_MD_CTX_init(&mdctx); |
| 354 | \& EVP_DigestInit_ex(&mdctx, md, NULL); |
| 355 | \& EVP_DigestUpdate(&mdctx, mess1, strlen(mess1)); |
| 356 | \& EVP_DigestUpdate(&mdctx, mess2, strlen(mess2)); |
| 357 | \& EVP_DigestFinal_ex(&mdctx, md_value, &md_len); |
| 358 | \& EVP_MD_CTX_cleanup(&mdctx); |
| 359 | \& |
| 360 | \& printf("Digest is: "); |
| 361 | \& for(i = 0; i < md_len; i++) printf("%02x", md_value[i]); |
| 362 | \& printf("\en"); |
| 363 | \& } |
| 364 | .Ve |
| 365 | .SH "BUGS" |
| 366 | .IX Header "BUGS" |
| 367 | The link between digests and signing algorithms results in a situation where |
| 368 | \&\fIEVP_sha1()\fR must be used with \s-1RSA\s0 and \fIEVP_dss1()\fR must be used with \s-1DSS\s0 |
| 369 | even though they are identical digests. |
| 370 | .SH "SEE ALSO" |
| 371 | .IX Header "SEE ALSO" |
| 372 | \&\fIevp\fR\|(3), \fIhmac\fR\|(3), \fImd2\fR\|(3), |
| 373 | \&\fImd5\fR\|(3), \fImdc2\fR\|(3), \fIripemd\fR\|(3), |
| 374 | \&\fIsha\fR\|(3), \fIdgst\fR\|(1) |
| 375 | .SH "HISTORY" |
| 376 | .IX Header "HISTORY" |
| 377 | \&\fIEVP_DigestInit()\fR, \fIEVP_DigestUpdate()\fR and \fIEVP_DigestFinal()\fR are |
| 378 | available in all versions of SSLeay and OpenSSL. |
| 379 | .PP |
| 380 | \&\fIEVP_MD_CTX_init()\fR, \fIEVP_MD_CTX_create()\fR, \fIEVP_MD_CTX_copy_ex()\fR, |
| 381 | \&\fIEVP_MD_CTX_cleanup()\fR, \fIEVP_MD_CTX_destroy()\fR, \fIEVP_DigestInit_ex()\fR |
| 382 | and \fIEVP_DigestFinal_ex()\fR were added in OpenSSL 0.9.7. |
| 383 | .PP |
| 384 | \&\fIEVP_md_null()\fR, \fIEVP_md2()\fR, \fIEVP_md5()\fR, \fIEVP_sha()\fR, \fIEVP_sha1()\fR, |
| 385 | \&\fIEVP_dss()\fR, \fIEVP_dss1()\fR, \fIEVP_mdc2()\fR and \fIEVP_ripemd160()\fR were |
| 386 | changed to return truely const \s-1EVP_MD\s0 * in OpenSSL 0.9.7. |