1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #ifndef OPENSSL_HEADER_DIGEST_H 58 #define OPENSSL_HEADER_DIGEST_H 59 60 #include <openssl/base.h> 61 62 #if defined(__cplusplus) 63 extern "C" { 64 #endif 65 66 67 /* Digest functions. 68 * 69 * An EVP_MD abstracts the details of a specific hash function allowing code to 70 * deal with the concept of a "hash function" without needing to know exactly 71 * which hash function it is. */ 72 73 74 /* Hash algorithms. 75 * 76 * The following functions return |EVP_MD| objects that implement the named hash 77 * function. */ 78 79 OPENSSL_EXPORT const EVP_MD *EVP_md4(void); 80 OPENSSL_EXPORT const EVP_MD *EVP_md5(void); 81 OPENSSL_EXPORT const EVP_MD *EVP_sha1(void); 82 OPENSSL_EXPORT const EVP_MD *EVP_sha224(void); 83 OPENSSL_EXPORT const EVP_MD *EVP_sha256(void); 84 OPENSSL_EXPORT const EVP_MD *EVP_sha384(void); 85 OPENSSL_EXPORT const EVP_MD *EVP_sha512(void); 86 87 /* EVP_get_digestbynid returns an |EVP_MD| for the given NID, or NULL if no 88 * such digest is known. */ 89 OPENSSL_EXPORT const EVP_MD *EVP_get_digestbynid(int nid); 90 91 /* EVP_get_digestbyobj returns an |EVP_MD| for the given |ASN1_OBJECT|, or NULL 92 * if no such digest is known. */ 93 OPENSSL_EXPORT const EVP_MD *EVP_get_digestbyobj(const ASN1_OBJECT *obj); 94 95 96 /* Digest contexts. 97 * 98 * An EVP_MD_CTX represents the state of a specific digest operation in 99 * progress. */ 100 101 /* EVP_MD_CTX_init initialises an, already allocated, |EVP_MD_CTX|. */ 102 OPENSSL_EXPORT void EVP_MD_CTX_init(EVP_MD_CTX *ctx); 103 104 /* EVP_MD_CTX_create allocates and initialises a fresh |EVP_MD_CTX| and returns 105 * it, or NULL on allocation failure. */ 106 OPENSSL_EXPORT EVP_MD_CTX *EVP_MD_CTX_create(void); 107 108 /* EVP_MD_CTX_cleanup frees any resources owned by |ctx| and resets it to a 109 * freshly initialised state. It does not free |ctx| itself. It returns one. */ 110 OPENSSL_EXPORT int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx); 111 112 /* EVP_MD_CTX_destroy calls |EVP_MD_CTX_cleanup| and then frees |ctx| itself. */ 113 OPENSSL_EXPORT void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx); 114 115 /* EVP_MD_CTX_copy_ex sets |out|, which must already be initialised, to be a 116 * copy of |in|. It returns one on success and zero on error. */ 117 OPENSSL_EXPORT int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in); 118 119 120 /* Digest operations. */ 121 122 /* EVP_DigestInit_ex configures |ctx|, which must already have been 123 * initialised, for a fresh hashing operation using |type|. It returns one on 124 * success and zero otherwise. */ 125 OPENSSL_EXPORT int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, 126 ENGINE *engine); 127 128 /* EVP_DigestInit acts like |EVP_DigestInit_ex| except that |ctx| is 129 * initialised before use. */ 130 OPENSSL_EXPORT int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type); 131 132 /* EVP_DigestUpdate hashes |len| bytes from |data| into the hashing operation 133 * in |ctx|. It returns one on success and zero otherwise. */ 134 OPENSSL_EXPORT int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, 135 size_t len); 136 137 /* EVP_MAX_MD_SIZE is the largest digest size supported. Functions that output 138 * a digest generally require the buffer have at least this much space. */ 139 #define EVP_MAX_MD_SIZE 64 /* SHA-512 is the longest so far. */ 140 141 /* EVP_DigestFinal_ex finishes the digest in |ctx| and writes the output to 142 * |md_out|. At most |EVP_MAX_MD_SIZE| bytes are written. If |out_size| is not 143 * NULL then |*out_size| is set to the number of bytes written. It returns one 144 * on success and zero otherwise. After this call, the hash cannot be updated 145 * or finished again until |EVP_DigestFinal_ex| is called to start another 146 * hashing operation. */ 147 OPENSSL_EXPORT int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, uint8_t *md_out, 148 unsigned int *out_size); 149 150 /* EVP_DigestFinal acts like |EVP_DigestFinal_ex| except that 151 * |EVP_MD_CTX_cleanup| is called on |ctx| before returning. */ 152 OPENSSL_EXPORT int EVP_DigestFinal(EVP_MD_CTX *ctx, uint8_t *md_out, 153 unsigned int *out_size); 154 155 /* EVP_Digest performs a complete hashing operation in one call. It hashes 156 * |len| bytes from |data| and writes the digest to |md_out|. At most 157 * |EVP_MAX_MD_SIZE| bytes are written. If |out_size| is not NULL then 158 * |*out_size| is set to the number of bytes written. It returns one on success 159 * and zero otherwise. */ 160 OPENSSL_EXPORT int EVP_Digest(const void *data, size_t len, uint8_t *md_out, 161 unsigned int *md_out_size, const EVP_MD *type, 162 ENGINE *impl); 163 164 165 /* Digest function accessors. 166 * 167 * These functions allow code to learn details about an abstract hash 168 * function. */ 169 170 /* EVP_MD_type returns a NID identifing |md|. (For example, |NID_md5|.) */ 171 OPENSSL_EXPORT int EVP_MD_type(const EVP_MD *md); 172 173 /* EVP_MD_name returns the short name for |md| or NULL if no name is known. */ 174 OPENSSL_EXPORT const char *EVP_MD_name(const EVP_MD *md); 175 176 /* EVP_MD_flags returns the flags for |md|, which is a set of |EVP_MD_FLAG_*| 177 * values, ORed together. */ 178 OPENSSL_EXPORT uint32_t EVP_MD_flags(const EVP_MD *md); 179 180 /* EVP_MD_size returns the digest size of |md|, in bytes. */ 181 OPENSSL_EXPORT size_t EVP_MD_size(const EVP_MD *md); 182 183 /* EVP_MD_block_size returns the native block-size of |md|. */ 184 OPENSSL_EXPORT size_t EVP_MD_block_size(const EVP_MD *md); 185 186 /* EVP_MD_FLAG_PKEY_DIGEST indicates the the digest function is used with a 187 * specific public key in order to verify signatures. (For example, 188 * EVP_dss1.) */ 189 #define EVP_MD_FLAG_PKEY_DIGEST 1 190 191 /* EVP_MD_FLAG_DIGALGID_ABSENT indicates that the parameter type in an X.509 192 * DigestAlgorithmIdentifier representing this digest function should be 193 * undefined rather than NULL. */ 194 #define EVP_MD_FLAG_DIGALGID_ABSENT 2 195 196 197 /* Deprecated functions. */ 198 199 /* EVP_MD_CTX_copy sets |out|, which must /not/ be initialised, to be a copy of 200 * |in|. It returns one on success and zero on error. */ 201 OPENSSL_EXPORT int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in); 202 203 /* EVP_add_digest does nothing and returns one. It exists only for 204 * compatibility with OpenSSL. */ 205 OPENSSL_EXPORT int EVP_add_digest(const EVP_MD *digest); 206 207 208 /* Digest operation accessors. */ 209 210 /* EVP_MD_CTX_md returns the underlying digest function, or NULL if one has not 211 * been set. */ 212 OPENSSL_EXPORT const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx); 213 214 /* EVP_MD_CTX_size returns the digest size of |ctx|. It will crash if a digest 215 * hasn't been set on |ctx|. */ 216 OPENSSL_EXPORT unsigned EVP_MD_CTX_size(const EVP_MD_CTX *ctx); 217 218 /* EVP_MD_CTX_block_size returns the block size of the digest function used by 219 * |ctx|. It will crash if a digest hasn't been set on |ctx|. */ 220 OPENSSL_EXPORT unsigned EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx); 221 222 /* EVP_MD_CTX_type returns a NID describing the digest function used by |ctx|. 223 * (For example, |NID_md5|.) It will crash if a digest hasn't been set on 224 * |ctx|. */ 225 OPENSSL_EXPORT int EVP_MD_CTX_type(const EVP_MD_CTX *ctx); 226 227 /* EVP_MD_CTX_set_flags ORs |flags| into the flags member of |ctx|. */ 228 OPENSSL_EXPORT void EVP_MD_CTX_set_flags(EVP_MD_CTX *ctx, uint32_t flags); 229 230 /* EVP_MD_CTX_clear_flags clears any bits from the flags member of |ctx| that 231 * are set in |flags|. */ 232 OPENSSL_EXPORT void EVP_MD_CTX_clear_flags(EVP_MD_CTX *ctx, uint32_t flags); 233 234 /* EVP_MD_CTX_test_flags returns the AND of |flags| and the flags member of 235 * |ctx|. */ 236 OPENSSL_EXPORT uint32_t 237 EVP_MD_CTX_test_flags(const EVP_MD_CTX *ctx, uint32_t flags); 238 239 240 struct evp_md_pctx_ops; 241 242 struct env_md_ctx_st { 243 /* digest is the underlying digest function, or NULL if not set. */ 244 const EVP_MD *digest; 245 /* flags is the OR of a number of |EVP_MD_CTX_FLAG_*| values. */ 246 uint32_t flags; 247 /* md_data points to a block of memory that contains the hash-specific 248 * context. */ 249 void *md_data; 250 /* update is usually copied from |digest->update| but can differ in some 251 * cases, i.e. HMAC. */ 252 int (*update)(EVP_MD_CTX *ctx, const void *data, size_t count); 253 254 /* pctx is an opaque (at this layer) pointer to additional context that 255 * EVP_PKEY functions may store in this object. */ 256 EVP_PKEY_CTX *pctx; 257 258 /* pctx_ops, if not NULL, points to a vtable that contains functions to 259 * manipulate |pctx|. */ 260 const struct evp_md_pctx_ops *pctx_ops; 261 } /* EVP_MD_CTX */; 262 263 /* EVP_MD_CTX_FLAG_NO_INIT causes the |EVP_MD|'s |init| function not to be 264 * called, the |update| member not to be copied from the |EVP_MD| in 265 * |EVP_DigestInit_ex| and for |md_data| not to be initialised. */ 266 #define EVP_MD_CTX_FLAG_NO_INIT 1 267 268 269 #if defined(__cplusplus) 270 } /* extern C */ 271 #endif 272 273 #define DIGEST_F_EVP_DigestInit_ex 100 274 #define DIGEST_F_EVP_MD_CTX_copy_ex 101 275 #define DIGEST_R_INPUT_NOT_INITIALIZED 100 276 277 #endif /* OPENSSL_HEADER_DIGEST_H */ 278
