wolfssl/doc/dox_comments/header_files/hash.h

/*!
    \ingroup wolfCrypt
    
    \brief This function will return the OID for the wc_HashType provided.
    
    \return OID returns value greater than 0
    \return HASH_TYPE_E hash type not supported.
    \return BAD_FUNC_ARG one of the provided arguments is incorrect.
    
    \param hash_type A hash type from the “enum  wc_HashType” such 
    as “WC_HASH_TYPE_SHA256”.
    
    _Example_
    \code
    enum wc_HashType hash_type = WC_HASH_TYPE_SHA256;
    int oid = wc_HashGetOID(hash_type);
    if (oid > 0) {
    	// Success
    }
    \endcode
    
    \sa wc_HashGetDigestSize
    \sa wc_Hash
*/
WOLFSSL_API int wc_HashGetOID(enum wc_HashType hash_type);

/*!
    \ingroup wolfCrypt
    
    \brief This function returns the size of the digest (output) for a 
    hash_type. The returns size is used to make sure the output buffer 
    provided to wc_Hash is large enough.
    
    \return Success A positive return value indicates the digest size 
    for the hash.
    \return Error Returns HASH_TYPE_E if hash_type is not supported. 
    \return Failure Returns BAD_FUNC_ARG if an invalid hash_type was used.
    
    \param hash_type A hash type from the “enum  wc_HashType” such as 
    “WC_HASH_TYPE_SHA256”.
    
    _Example_
    \code
    int hash_len = wc_HashGetDigestSize(hash_type);
    if (hash_len <= 0) {
    WOLFSSL_MSG("Invalid hash type/len");
    return BAD_FUNC_ARG;
    }
    \endcode
    
    \sa wc_Hash
*/
WOLFSSL_API int wc_HashGetDigestSize(enum wc_HashType hash_type);

/*!
    \ingroup wolfCrypt
    
    \brief This function performs a hash on the provided data buffer 
    and returns it in the hash buffer provided.
    
    \return 0 Success, else error (such as BAD_FUNC_ARG or BUFFER_E).
    
    \param hash_type A hash type from the “enum  wc_HashType” 
    such as “WC_HASH_TYPE_SHA256”.
    \param data Pointer to buffer containing the data to hash.
    \param data_len Length of the data buffer.
    \param hash Pointer to buffer used to output the final hash to.
    \param hash_len Length of the hash buffer.
    
    _Example_
    \code
    enum wc_HashType hash_type = WC_HASH_TYPE_SHA256;
    int hash_len = wc_HashGetDigestSize(hash_type);
    if (hash_len > 0) {
        int ret = wc_Hash(hash_type, data, data_len, hash_data, hash_len);
        if(ret == 0) {
		    // Success
        }
    }
    \endcode
    
    \sa wc_HashGetDigestSize
*/
WOLFSSL_API int wc_Hash(enum wc_HashType hash_type,
    const byte* data, word32 data_len,
    byte* hash, word32 hash_len);

/*!
    \ingroup MD5
    
    \brief Convenience function, handles all the hashing and places the 
    result into hash.
    
    \return 0 Returned upon successfully hashing the data.
    \return Memory_E memory error, unable to allocate memory. This is only 
    possible with the small stack option enabled.
    
    \param data the data to hash
    \param len the length of data
    \param hash Byte array to hold hash value.

    _Example_
    \code
    const byte* data;
    word32 data_len;
    byte* hash;
    int ret;
    ... 
    ret = wc_Md5Hash(data, data_len, hash);
    if (ret != 0) {
         // Md5 Hash Failure Case.
    }
    \endcode
    
    \sa wc_Md5Hash
    \sa wc_Md5Final
    \sa wc_InitMd5
*/
WOLFSSL_API int wc_Md5Hash(const byte* data, word32 len, byte* hash);

/*!
    \ingroup SHA
    
    \brief Convenience function, handles all the hashing and places the 
    result into hash.
    
    \return 0 Returned upon successfully ….
    \return Memory_E memory error, unable to allocate memory. This is only 
    possible with the small stack option enabled.
    
    \param data the data to hash
    \param len the length of data
    \param hash Byte array to hold hash value.
    
    _Example_
    \code
    none
    \endcode
    
    \sa wc_ShaHash
    \sa wc_ShaFinal
    \sa wc_InitSha
*/
WOLFSSL_API int wc_ShaHash(const byte*, word32, byte*);

/*!
    \ingroup SHA
    
    \brief Convenience function, handles all the hashing and places the 
    result into hash.
    
    \return 0 Returned upon successfully …
    \return Memory_E memory error, unable to allocate memory. This is only 
    possible with the small stack option enabled.
    
    \param data the data to hash
    \param len the length of data
    \param hash Byte array to hold hash value.
    
    _Example_
    \code
    none
    \endcode
    
    \sa wc_Sha256Hash
    \sa wc_Sha256Final
    \sa wc_InitSha256
*/
WOLFSSL_API int wc_Sha256Hash(const byte*, word32, byte*);

/*!
    \ingroup SHA
    
    \brief Convenience function, handles all the hashing and places the 
    result into hash.
    
    \return 0 Success
    \return <0 Error
    
    \param data the data to hash
    \param len the length of data
    \param hash Byte array to hold hash value.
    
    _Example_
    \code
    none
    \endcode
    
    \sa wc_InitSha224
    \sa wc_Sha224Update
    \sa wc_Sha224Final
*/
WOLFSSL_API int wc_Sha224Hash(const byte*, word32, byte*);

/*!
    \ingroup SHA
    
    \brief Convenience function, handles all the hashing and places the 
    result into hash.
    
    \return 0 Returned upon successfully hashing the inputted data
    \return Memory_E memory error, unable to allocate memory. This is only 
    possible with the small stack option enabled.
    
    \param data the data to hash
    \param len the length of data
    \param hash Byte array to hold hash value.

    _Example_
    \code
    none
    \endcode
    
    \sa wc_Sha512Hash
    \sa wc_Sha512Final
    \sa wc_InitSha512
*/
WOLFSSL_API int wc_Sha512Hash(const byte*, word32, byte*);

/*!
    \ingroup SHA
    
    \brief Convenience function, handles all the hashing and places the 
    result into hash.
    
    \return 0 Returned upon successfully hashing the data
    \return Memory_E memory error, unable to allocate memory. This is only 
    possible with the small stack option enabled.

    \param data the data to hash
    \param len the length of data
    \param hash Byte array to hold hash value.
    
    _Example_
    \code
    none
    \endcode

    \sa wc_Sha384Hash
    \sa wc_Sha384Final
    \sa wc_InitSha384
*/
WOLFSSL_API int wc_Sha384Hash(const byte*, word32, byte*);