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MD5(3ossl)                           OpenSSL                          MD5(3ossl)





NAME

       MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update,
       MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash
       functions


SYNOPSIS

        #include <openssl/md2.h>

       The following functions have been deprecated since OpenSSL 3.0, and can
       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version
       value, see openssl_user_macros(7):

        unsigned char *MD2(const unsigned char *d, unsigned long n, unsigned char *md);

        int MD2_Init(MD2_CTX *c);
        int MD2_Update(MD2_CTX *c, const unsigned char *data, unsigned long len);
        int MD2_Final(unsigned char *md, MD2_CTX *c);


        #include <openssl/md4.h>

       The following functions have been deprecated since OpenSSL 3.0, and can
       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version
       value, see openssl_user_macros(7):

        unsigned char *MD4(const unsigned char *d, unsigned long n, unsigned char *md);

        int MD4_Init(MD4_CTX *c);
        int MD4_Update(MD4_CTX *c, const void *data, unsigned long len);
        int MD4_Final(unsigned char *md, MD4_CTX *c);


        #include <openssl/md5.h>

       The following functions have been deprecated since OpenSSL 3.0, and can
       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version
       value, see openssl_user_macros(7):

        unsigned char *MD5(const unsigned char *d, unsigned long n, unsigned char *md);

        int MD5_Init(MD5_CTX *c);
        int MD5_Update(MD5_CTX *c, const void *data, unsigned long len);
        int MD5_Final(unsigned char *md, MD5_CTX *c);


DESCRIPTION

       All of the functions described on this page are deprecated.  Applications
       should instead use EVP_DigestInit_ex(3), EVP_DigestUpdate(3) and
       EVP_DigestFinal_ex(3).

       MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output.

       MD5(3) compute the MD2, MD4, and MD5 message digest of
       the n bytes at d and place it in md (which must have space for
       MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 bytes
       of output). If md is NULL, the digest is placed in a static array.

       The following functions may be used if the message is not completely
       stored in memory:

       MD2_Init() initializes a MD2_CTX structure.

       MD2_Update() can be called repeatedly with chunks of the message to be
       hashed (len bytes at data).

       MD2_Final() places the message digest in md, which must have space for
       MD2_DIGEST_LENGTH == 16 bytes of output, and erases the MD2_CTX.

       MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and
       MD5_Final() are analogous using an MD4_CTX and MD5_CTX structure.

       Applications should use the higher level functions EVP_DigestInit(3) etc.
       instead of calling the hash functions directly.


NOTE

       MD2, MD4, and MD5 are recommended only for compatibility with existing
       applications. In new applications, hashes from the SHA-2 or SHA-3 family
       should be preferred.


RETURN VALUES

       MD5(3) return pointers to the hash value.

       MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(),
       MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() return 1 for
       success, 0 otherwise.


CONFORMING TO

       RFC 1319, RFC 1320, RFC 1321


SEE ALSO

       EVP_DigestInit(3), EVP_MD-SHA2(7), EVP_MD-SHA3(7)


HISTORY

       All of these functions were deprecated in OpenSSL 3.0.


COPYRIGHT

       Copyright 2000-2023 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.



3.0.8                              2023-02-07                         MD5(3ossl)

openssl 3.0.8 - Generated Thu Feb 9 18:20:54 CST 2023
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