MD5 - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEMD2, 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> ​ ​ 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> ​ ​ 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> ​ ​ 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​MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output. ​MD2(), MD4(), and MD5() 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, SHA−1 or RIPEMD−160 should be preferred.
RETURN VALUES​MD2(), MD4(), and MD5() 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)
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