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Title "md5 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
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 Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" \s-1MD2, MD4,\s0 and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output.

\s-1MD2\s0(), \s-1MD4\s0(), and \s-1MD5\s0() compute the \s-1MD2, MD4,\s0 and \s-1MD5\s0 message digest of the n bytes at d and place it in md (which must have space for \s-1MD2_DIGEST_LENGTH\s0 == \s-1MD4_DIGEST_LENGTH\s0 == \s-1MD5_DIGEST_LENGTH\s0 == 16 bytes of output). If md is \s-1NULL,\s0 the digest is placed in a static array.

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

\fIMD2_Init() initializes a \s-1MD2_CTX\s0 structure.

\fIMD2_Update() can be called repeatedly with chunks of the message to be hashed (len bytes at data).

\fIMD2_Final() places the message digest in md, which must have space for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \s-1MD2_CTX\s0.

\fIMD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and \fIMD5_Final() are analogous using an \s-1MD4_CTX\s0 and \s-1MD5_CTX\s0 structure.

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

Header "NOTE" \s-1MD2, MD4,\s0 and \s-1MD5\s0 are recommended only for compatibility with existing applications. In new applications, \s-1SHA-1\s0 or \s-1RIPEMD-160\s0 should be preferred. Header "RETURN VALUES" \s-1MD2\s0(), \s-1MD4\s0(), and \s-1MD5\s0() return pointers to the hash value.

\fIMD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(), \fIMD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() return 1 for success, 0 otherwise.

Header "CONFORMING TO" \s-1RFC 1319, RFC 1320, RFC 1321\s0 Header "SEE ALSO" \fIsha\|(3), ripemd\|(3), EVP_DigestInit\|(3) Header "HISTORY" \s-1MD2\s0(), MD2_Init(), MD2_Update() MD2_Final(), \s-1MD5\s0(), MD5_Init(), \fIMD5_Update() and MD5_Final() are available in all versions of SSLeay and OpenSSL.

\s-1MD4\s0(), MD4_Init(), and MD4_Update() are available in OpenSSL 0.9.6 and above.