| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library used. |
| * This can be in the form of a textual message at program startup or |
| * in documentation (online or textual) provided with the package. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * "This product includes cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * The licence and distribution terms for any publically available version or |
| * derivative of this code cannot be changed. i.e. this code cannot simply be |
| * copied and put under another distribution licence |
| * [including the GNU Public Licence.] */ |
| |
| #ifndef OPENSSL_HEADER_DIGEST_H |
| #define OPENSSL_HEADER_DIGEST_H |
| |
| #include <openssl/base.h> |
| |
| #if defined(__cplusplus) |
| extern "C" { |
| #endif |
| |
| |
| // Digest functions. |
| // |
| // An EVP_MD abstracts the details of a specific hash function allowing code to |
| // deal with the concept of a "hash function" without needing to know exactly |
| // which hash function it is. |
| |
| |
| // Hash algorithms. |
| // |
| // The following functions return |EVP_MD| objects that implement the named hash |
| // function. |
| |
| OPENSSL_EXPORT const EVP_MD *EVP_md4(void); |
| OPENSSL_EXPORT const EVP_MD *EVP_md5(void); |
| OPENSSL_EXPORT const EVP_MD *EVP_sha1(void); |
| OPENSSL_EXPORT const EVP_MD *EVP_sha224(void); |
| OPENSSL_EXPORT const EVP_MD *EVP_sha256(void); |
| OPENSSL_EXPORT const EVP_MD *EVP_sha384(void); |
| OPENSSL_EXPORT const EVP_MD *EVP_sha512(void); |
| |
| // EVP_md5_sha1 is a TLS-specific |EVP_MD| which computes the concatenation of |
| // MD5 and SHA-1, as used in TLS 1.1 and below. |
| OPENSSL_EXPORT const EVP_MD *EVP_md5_sha1(void); |
| |
| // EVP_get_digestbynid returns an |EVP_MD| for the given NID, or NULL if no |
| // such digest is known. |
| OPENSSL_EXPORT const EVP_MD *EVP_get_digestbynid(int nid); |
| |
| // EVP_get_digestbyobj returns an |EVP_MD| for the given |ASN1_OBJECT|, or NULL |
| // if no such digest is known. |
| OPENSSL_EXPORT const EVP_MD *EVP_get_digestbyobj(const ASN1_OBJECT *obj); |
| |
| |
| // Digest contexts. |
| // |
| // An EVP_MD_CTX represents the state of a specific digest operation in |
| // progress. |
| |
| // EVP_MD_CTX_init initialises an, already allocated, |EVP_MD_CTX|. This is the |
| // same as setting the structure to zero. |
| OPENSSL_EXPORT void EVP_MD_CTX_init(EVP_MD_CTX *ctx); |
| |
| // EVP_MD_CTX_new allocates and initialises a fresh |EVP_MD_CTX| and returns |
| // it, or NULL on allocation failure. The caller must use |EVP_MD_CTX_free| to |
| // release the resulting object. |
| OPENSSL_EXPORT EVP_MD_CTX *EVP_MD_CTX_new(void); |
| |
| // EVP_MD_CTX_cleanup frees any resources owned by |ctx| and resets it to a |
| // freshly initialised state. It does not free |ctx| itself. It returns one. |
| OPENSSL_EXPORT int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx); |
| |
| // EVP_MD_CTX_free calls |EVP_MD_CTX_cleanup| and then frees |ctx| itself. |
| OPENSSL_EXPORT void EVP_MD_CTX_free(EVP_MD_CTX *ctx); |
| |
| // EVP_MD_CTX_copy_ex sets |out|, which must already be initialised, to be a |
| // copy of |in|. It returns one on success and zero on error. |
| OPENSSL_EXPORT int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in); |
| |
| // EVP_MD_CTX_reset calls |EVP_MD_CTX_cleanup| followed by |EVP_MD_CTX_init|. |
| OPENSSL_EXPORT void EVP_MD_CTX_reset(EVP_MD_CTX *ctx); |
| |
| |
| // Digest operations. |
| |
| // EVP_DigestInit_ex configures |ctx|, which must already have been |
| // initialised, for a fresh hashing operation using |type|. It returns one on |
| // success and zero otherwise. |
| OPENSSL_EXPORT int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, |
| ENGINE *engine); |
| |
| // EVP_DigestInit acts like |EVP_DigestInit_ex| except that |ctx| is |
| // initialised before use. |
| OPENSSL_EXPORT int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type); |
| |
| // EVP_DigestUpdate hashes |len| bytes from |data| into the hashing operation |
| // in |ctx|. It returns one. |
| OPENSSL_EXPORT int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, |
| size_t len); |
| |
| // EVP_MAX_MD_SIZE is the largest digest size supported, in bytes. |
| // Functions that output a digest generally require the buffer have |
| // at least this much space. |
| #define EVP_MAX_MD_SIZE 64 // SHA-512 is the longest so far. |
| |
| // EVP_MAX_MD_BLOCK_SIZE is the largest digest block size supported, in |
| // bytes. |
| #define EVP_MAX_MD_BLOCK_SIZE 128 // SHA-512 is the longest so far. |
| |
| // EVP_DigestFinal_ex finishes the digest in |ctx| and writes the output to |
| // |md_out|. |EVP_MD_CTX_size| bytes are written, which is at most |
| // |EVP_MAX_MD_SIZE|. If |out_size| is not NULL then |*out_size| is set to the |
| // number of bytes written. It returns one. After this call, the hash cannot be |
| // updated or finished again until |EVP_DigestInit_ex| is called to start |
| // another hashing operation. |
| OPENSSL_EXPORT int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, uint8_t *md_out, |
| unsigned int *out_size); |
| |
| // EVP_DigestFinal acts like |EVP_DigestFinal_ex| except that |
| // |EVP_MD_CTX_cleanup| is called on |ctx| before returning. |
| OPENSSL_EXPORT int EVP_DigestFinal(EVP_MD_CTX *ctx, uint8_t *md_out, |
| unsigned int *out_size); |
| |
| // EVP_Digest performs a complete hashing operation in one call. It hashes |len| |
| // bytes from |data| and writes the digest to |md_out|. |EVP_MD_CTX_size| bytes |
| // are written, which is at most |EVP_MAX_MD_SIZE|. If |out_size| is not NULL |
| // then |*out_size| is set to the number of bytes written. It returns one on |
| // success and zero otherwise. |
| OPENSSL_EXPORT int EVP_Digest(const void *data, size_t len, uint8_t *md_out, |
| unsigned int *md_out_size, const EVP_MD *type, |
| ENGINE *impl); |
| |
| |
| // Digest function accessors. |
| // |
| // These functions allow code to learn details about an abstract hash |
| // function. |
| |
| // EVP_MD_type returns a NID identifying |md|. (For example, |NID_sha256|.) |
| OPENSSL_EXPORT int EVP_MD_type(const EVP_MD *md); |
| |
| // EVP_MD_flags returns the flags for |md|, which is a set of |EVP_MD_FLAG_*| |
| // values, ORed together. |
| OPENSSL_EXPORT uint32_t EVP_MD_flags(const EVP_MD *md); |
| |
| // EVP_MD_size returns the digest size of |md|, in bytes. |
| OPENSSL_EXPORT size_t EVP_MD_size(const EVP_MD *md); |
| |
| // EVP_MD_block_size returns the native block-size of |md|, in bytes. |
| OPENSSL_EXPORT size_t EVP_MD_block_size(const EVP_MD *md); |
| |
| // EVP_MD_FLAG_PKEY_DIGEST indicates the the digest function is used with a |
| // specific public key in order to verify signatures. (For example, |
| // EVP_dss1.) |
| #define EVP_MD_FLAG_PKEY_DIGEST 1 |
| |
| // EVP_MD_FLAG_DIGALGID_ABSENT indicates that the parameter type in an X.509 |
| // DigestAlgorithmIdentifier representing this digest function should be |
| // undefined rather than NULL. |
| #define EVP_MD_FLAG_DIGALGID_ABSENT 2 |
| |
| |
| // Digest operation accessors. |
| |
| // EVP_MD_CTX_md returns the underlying digest function, or NULL if one has not |
| // been set. |
| OPENSSL_EXPORT const EVP_MD *EVP_MD_CTX_md(const EVP_MD_CTX *ctx); |
| |
| // EVP_MD_CTX_size returns the digest size of |ctx|, in bytes. It |
| // will crash if a digest hasn't been set on |ctx|. |
| OPENSSL_EXPORT size_t EVP_MD_CTX_size(const EVP_MD_CTX *ctx); |
| |
| // EVP_MD_CTX_block_size returns the block size of the digest function used by |
| // |ctx|, in bytes. It will crash if a digest hasn't been set on |ctx|. |
| OPENSSL_EXPORT size_t EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx); |
| |
| // EVP_MD_CTX_type returns a NID describing the digest function used by |ctx|. |
| // (For example, |NID_sha256|.) It will crash if a digest hasn't been set on |
| // |ctx|. |
| OPENSSL_EXPORT int EVP_MD_CTX_type(const EVP_MD_CTX *ctx); |
| |
| |
| // ASN.1 functions. |
| // |
| // These functions allow code to parse and serialize AlgorithmIdentifiers for |
| // hash functions. |
| |
| // EVP_parse_digest_algorithm parses an AlgorithmIdentifier structure containing |
| // a hash function OID (for example, 2.16.840.1.101.3.4.2.1 is SHA-256) and |
| // advances |cbs|. The parameters field may either be omitted or a NULL. It |
| // returns the digest function or NULL on error. |
| OPENSSL_EXPORT const EVP_MD *EVP_parse_digest_algorithm(CBS *cbs); |
| |
| // EVP_marshal_digest_algorithm marshals |md| as an AlgorithmIdentifier |
| // structure and appends the result to |cbb|. It returns one on success and zero |
| // on error. |
| OPENSSL_EXPORT int EVP_marshal_digest_algorithm(CBB *cbb, const EVP_MD *md); |
| |
| |
| // Deprecated functions. |
| |
| // EVP_MD_CTX_copy sets |out|, which must /not/ be initialised, to be a copy of |
| // |in|. It returns one on success and zero on error. |
| OPENSSL_EXPORT int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in); |
| |
| // EVP_add_digest does nothing and returns one. It exists only for |
| // compatibility with OpenSSL. |
| OPENSSL_EXPORT int EVP_add_digest(const EVP_MD *digest); |
| |
| // EVP_get_digestbyname returns an |EVP_MD| given a human readable name in |
| // |name|, or NULL if the name is unknown. |
| OPENSSL_EXPORT const EVP_MD *EVP_get_digestbyname(const char *); |
| |
| // EVP_dss1 returns the value of EVP_sha1(). This was provided by OpenSSL to |
| // specifiy the original DSA signatures, which were fixed to use SHA-1. Note, |
| // however, that attempting to sign or verify DSA signatures with the EVP |
| // interface will always fail. |
| OPENSSL_EXPORT const EVP_MD *EVP_dss1(void); |
| |
| // EVP_MD_CTX_create calls |EVP_MD_CTX_new|. |
| OPENSSL_EXPORT EVP_MD_CTX *EVP_MD_CTX_create(void); |
| |
| // EVP_MD_CTX_destroy calls |EVP_MD_CTX_free|. |
| OPENSSL_EXPORT void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx); |
| |
| |
| struct evp_md_pctx_ops; |
| |
| struct env_md_ctx_st { |
| // digest is the underlying digest function, or NULL if not set. |
| const EVP_MD *digest; |
| // md_data points to a block of memory that contains the hash-specific |
| // context. |
| void *md_data; |
| |
| // pctx is an opaque (at this layer) pointer to additional context that |
| // EVP_PKEY functions may store in this object. |
| EVP_PKEY_CTX *pctx; |
| |
| // pctx_ops, if not NULL, points to a vtable that contains functions to |
| // manipulate |pctx|. |
| const struct evp_md_pctx_ops *pctx_ops; |
| } /* EVP_MD_CTX */; |
| |
| |
| #if defined(__cplusplus) |
| } // extern C |
| |
| #if !defined(BORINGSSL_NO_CXX) |
| extern "C++" { |
| |
| namespace bssl { |
| |
| BORINGSSL_MAKE_DELETER(EVP_MD_CTX, EVP_MD_CTX_free) |
| |
| using ScopedEVP_MD_CTX = |
| internal::StackAllocated<EVP_MD_CTX, int, EVP_MD_CTX_init, |
| EVP_MD_CTX_cleanup>; |
| |
| } // namespace bssl |
| |
| } // extern C++ |
| #endif |
| |
| #endif |
| |
| #define DIGEST_R_INPUT_NOT_INITIALIZED 100 |
| #define DIGEST_R_DECODE_ERROR 101 |
| #define DIGEST_R_UNKNOWN_HASH 102 |
| |
| #endif // OPENSSL_HEADER_DIGEST_H |
