--- /dev/null
+/* 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
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