1*2175Sjp161948=pod 2*2175Sjp161948 3*2175Sjp161948=head1 NAME 4*2175Sjp161948 5*2175Sjp161948MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update, 6*2175Sjp161948MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash functions 7*2175Sjp161948 8*2175Sjp161948=head1 SYNOPSIS 9*2175Sjp161948 10*2175Sjp161948 #include <openssl/md2.h> 11*2175Sjp161948 12*2175Sjp161948 unsigned char *MD2(const unsigned char *d, unsigned long n, 13*2175Sjp161948 unsigned char *md); 14*2175Sjp161948 15*2175Sjp161948 void MD2_Init(MD2_CTX *c); 16*2175Sjp161948 void MD2_Update(MD2_CTX *c, const unsigned char *data, 17*2175Sjp161948 unsigned long len); 18*2175Sjp161948 void MD2_Final(unsigned char *md, MD2_CTX *c); 19*2175Sjp161948 20*2175Sjp161948 21*2175Sjp161948 #include <openssl/md4.h> 22*2175Sjp161948 23*2175Sjp161948 unsigned char *MD4(const unsigned char *d, unsigned long n, 24*2175Sjp161948 unsigned char *md); 25*2175Sjp161948 26*2175Sjp161948 void MD4_Init(MD4_CTX *c); 27*2175Sjp161948 void MD4_Update(MD4_CTX *c, const void *data, 28*2175Sjp161948 unsigned long len); 29*2175Sjp161948 void MD4_Final(unsigned char *md, MD4_CTX *c); 30*2175Sjp161948 31*2175Sjp161948 32*2175Sjp161948 #include <openssl/md5.h> 33*2175Sjp161948 34*2175Sjp161948 unsigned char *MD5(const unsigned char *d, unsigned long n, 35*2175Sjp161948 unsigned char *md); 36*2175Sjp161948 37*2175Sjp161948 void MD5_Init(MD5_CTX *c); 38*2175Sjp161948 void MD5_Update(MD5_CTX *c, const void *data, 39*2175Sjp161948 unsigned long len); 40*2175Sjp161948 void MD5_Final(unsigned char *md, MD5_CTX *c); 41*2175Sjp161948 42*2175Sjp161948=head1 DESCRIPTION 43*2175Sjp161948 44*2175Sjp161948MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output. 45*2175Sjp161948 46*2175Sjp161948MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest 47*2175Sjp161948of the B<n> bytes at B<d> and place it in B<md> (which must have space 48*2175Sjp161948for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 49*2175Sjp161948bytes of output). If B<md> is NULL, the digest is placed in a static 50*2175Sjp161948array. 51*2175Sjp161948 52*2175Sjp161948The following functions may be used if the message is not completely 53*2175Sjp161948stored in memory: 54*2175Sjp161948 55*2175Sjp161948MD2_Init() initializes a B<MD2_CTX> structure. 56*2175Sjp161948 57*2175Sjp161948MD2_Update() can be called repeatedly with chunks of the message to 58*2175Sjp161948be hashed (B<len> bytes at B<data>). 59*2175Sjp161948 60*2175Sjp161948MD2_Final() places the message digest in B<md>, which must have space 61*2175Sjp161948for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the B<MD2_CTX>. 62*2175Sjp161948 63*2175Sjp161948MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and 64*2175Sjp161948MD5_Final() are analogous using an B<MD4_CTX> and B<MD5_CTX> structure. 65*2175Sjp161948 66*2175Sjp161948Applications should use the higher level functions 67*2175Sjp161948L<EVP_DigestInit(3)|EVP_DigestInit(3)> 68*2175Sjp161948etc. instead of calling the hash functions directly. 69*2175Sjp161948 70*2175Sjp161948=head1 NOTE 71*2175Sjp161948 72*2175Sjp161948MD2, MD4, and MD5 are recommended only for compatibility with existing 73*2175Sjp161948applications. In new applications, SHA-1 or RIPEMD-160 should be 74*2175Sjp161948preferred. 75*2175Sjp161948 76*2175Sjp161948=head1 RETURN VALUES 77*2175Sjp161948 78*2175Sjp161948MD2(), MD4(), and MD5() return pointers to the hash value. 79*2175Sjp161948 80*2175Sjp161948MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(), 81*2175Sjp161948MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() do not return 82*2175Sjp161948values. 83*2175Sjp161948 84*2175Sjp161948=head1 CONFORMING TO 85*2175Sjp161948 86*2175Sjp161948RFC 1319, RFC 1320, RFC 1321 87*2175Sjp161948 88*2175Sjp161948=head1 SEE ALSO 89*2175Sjp161948 90*2175Sjp161948L<sha(3)|sha(3)>, L<ripemd(3)|ripemd(3)>, L<EVP_DigestInit(3)|EVP_DigestInit(3)> 91*2175Sjp161948 92*2175Sjp161948=head1 HISTORY 93*2175Sjp161948 94*2175Sjp161948MD2(), MD2_Init(), MD2_Update() MD2_Final(), MD5(), MD5_Init(), 95*2175Sjp161948MD5_Update() and MD5_Final() are available in all versions of SSLeay 96*2175Sjp161948and OpenSSL. 97*2175Sjp161948 98*2175Sjp161948MD4(), MD4_Init(), and MD4_Update() are available in OpenSSL 0.9.6 and 99*2175Sjp161948above. 100*2175Sjp161948 101*2175Sjp161948=cut 102