| BIO_f_md.3 (206048) | BIO_f_md.3 (215698) |
|---|---|
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| 132.TH BIO_f_md 3 "2010-03-24" "0.9.8n" "OpenSSL" | 127.TH BIO_f_md 3 "2010-11-16" "0.9.8p" "OpenSSL" 128.\" For nroff, turn off justification. Always turn off hyphenation; it makes 129.\" way too many mistakes in technical documents. 130.if n .ad l 131.nh |
| 133.SH "NAME" 134BIO_f_md, BIO_set_md, BIO_get_md, BIO_get_md_ctx \- message digest BIO filter 135.SH "SYNOPSIS" 136.IX Header "SYNOPSIS" 137.Vb 2 138\& #include <openssl/bio.h> 139\& #include <openssl/evp.h> | 132.SH "NAME" 133BIO_f_md, BIO_set_md, BIO_get_md, BIO_get_md_ctx \- message digest BIO filter 134.SH "SYNOPSIS" 135.IX Header "SYNOPSIS" 136.Vb 2 137\& #include <openssl/bio.h> 138\& #include <openssl/evp.h> |
| 140.Ve 141.PP 142.Vb 4 | 139\& |
| 143\& BIO_METHOD * BIO_f_md(void); 144\& int BIO_set_md(BIO *b,EVP_MD *md); 145\& int BIO_get_md(BIO *b,EVP_MD **mdp); 146\& int BIO_get_md_ctx(BIO *b,EVP_MD_CTX **mdcp); 147.Ve 148.SH "DESCRIPTION" 149.IX Header "DESCRIPTION" 150\&\fIBIO_f_md()\fR returns the message digest \s-1BIO\s0 method. This is a filter --- 43 unchanged lines hidden (view full) --- 194\&\fIBIO_set_md()\fR, \fIBIO_get_md()\fR and \fIBIO_md_ctx()\fR return 1 for success and 1950 for failure. 196.SH "EXAMPLES" 197.IX Header "EXAMPLES" 198The following example creates a \s-1BIO\s0 chain containing an \s-1SHA1\s0 and \s-1MD5\s0 199digest \s-1BIO\s0 and passes the string \*(L"Hello World\*(R" through it. Error 200checking has been omitted for clarity. 201.PP | 140\& BIO_METHOD * BIO_f_md(void); 141\& int BIO_set_md(BIO *b,EVP_MD *md); 142\& int BIO_get_md(BIO *b,EVP_MD **mdp); 143\& int BIO_get_md_ctx(BIO *b,EVP_MD_CTX **mdcp); 144.Ve 145.SH "DESCRIPTION" 146.IX Header "DESCRIPTION" 147\&\fIBIO_f_md()\fR returns the message digest \s-1BIO\s0 method. This is a filter --- 43 unchanged lines hidden (view full) --- 191\&\fIBIO_set_md()\fR, \fIBIO_get_md()\fR and \fIBIO_md_ctx()\fR return 1 for success and 1920 for failure. 193.SH "EXAMPLES" 194.IX Header "EXAMPLES" 195The following example creates a \s-1BIO\s0 chain containing an \s-1SHA1\s0 and \s-1MD5\s0 196digest \s-1BIO\s0 and passes the string \*(L"Hello World\*(R" through it. Error 197checking has been omitted for clarity. 198.PP |
| 202.Vb 14 | 199.Vb 10 |
| 203\& BIO *bio, *mdtmp; 204\& char message[] = "Hello World"; 205\& bio = BIO_new(BIO_s_null()); 206\& mdtmp = BIO_new(BIO_f_md()); 207\& BIO_set_md(mdtmp, EVP_sha1()); 208\& /* For BIO_push() we want to append the sink BIO and keep a note of 209\& * the start of the chain. 210\& */ 211\& bio = BIO_push(mdtmp, bio); 212\& mdtmp = BIO_new(BIO_f_md()); 213\& BIO_set_md(mdtmp, EVP_md5()); 214\& bio = BIO_push(mdtmp, bio); 215\& /* Note: mdtmp can now be discarded */ 216\& BIO_write(bio, message, strlen(message)); 217.Ve 218.PP 219The next example digests data by reading through a chain instead: 220.PP | 200\& BIO *bio, *mdtmp; 201\& char message[] = "Hello World"; 202\& bio = BIO_new(BIO_s_null()); 203\& mdtmp = BIO_new(BIO_f_md()); 204\& BIO_set_md(mdtmp, EVP_sha1()); 205\& /* For BIO_push() we want to append the sink BIO and keep a note of 206\& * the start of the chain. 207\& */ 208\& bio = BIO_push(mdtmp, bio); 209\& mdtmp = BIO_new(BIO_f_md()); 210\& BIO_set_md(mdtmp, EVP_md5()); 211\& bio = BIO_push(mdtmp, bio); 212\& /* Note: mdtmp can now be discarded */ 213\& BIO_write(bio, message, strlen(message)); 214.Ve 215.PP 216The next example digests data by reading through a chain instead: 217.PP |
| 221.Vb 14 | 218.Vb 10 |
| 222\& BIO *bio, *mdtmp; 223\& char buf[1024]; 224\& int rdlen; 225\& bio = BIO_new_file(file, "rb"); 226\& mdtmp = BIO_new(BIO_f_md()); 227\& BIO_set_md(mdtmp, EVP_sha1()); 228\& bio = BIO_push(mdtmp, bio); 229\& mdtmp = BIO_new(BIO_f_md()); 230\& BIO_set_md(mdtmp, EVP_md5()); 231\& bio = BIO_push(mdtmp, bio); 232\& do { 233\& rdlen = BIO_read(bio, buf, sizeof(buf)); 234\& /* Might want to do something with the data here */ 235\& } while(rdlen > 0); 236.Ve 237.PP 238This next example retrieves the message digests from a \s-1BIO\s0 chain and 239outputs them. This could be used with the examples above. 240.PP | 219\& BIO *bio, *mdtmp; 220\& char buf[1024]; 221\& int rdlen; 222\& bio = BIO_new_file(file, "rb"); 223\& mdtmp = BIO_new(BIO_f_md()); 224\& BIO_set_md(mdtmp, EVP_sha1()); 225\& bio = BIO_push(mdtmp, bio); 226\& mdtmp = BIO_new(BIO_f_md()); 227\& BIO_set_md(mdtmp, EVP_md5()); 228\& bio = BIO_push(mdtmp, bio); 229\& do { 230\& rdlen = BIO_read(bio, buf, sizeof(buf)); 231\& /* Might want to do something with the data here */ 232\& } while(rdlen > 0); 233.Ve 234.PP 235This next example retrieves the message digests from a \s-1BIO\s0 chain and 236outputs them. This could be used with the examples above. 237.PP |
| 241.Vb 16 | 238.Vb 10 |
| 242\& BIO *mdtmp; 243\& unsigned char mdbuf[EVP_MAX_MD_SIZE]; 244\& int mdlen; 245\& int i; 246\& mdtmp = bio; /* Assume bio has previously been set up */ 247\& do { 248\& EVP_MD *md; 249\& mdtmp = BIO_find_type(mdtmp, BIO_TYPE_MD); 250\& if(!mdtmp) break; 251\& BIO_get_md(mdtmp, &md); 252\& printf("%s digest", OBJ_nid2sn(EVP_MD_type(md))); 253\& mdlen = BIO_gets(mdtmp, mdbuf, EVP_MAX_MD_SIZE); 254\& for(i = 0; i < mdlen; i++) printf(":%02X", mdbuf[i]); 255\& printf("\en"); 256\& mdtmp = BIO_next(mdtmp); 257\& } while(mdtmp); | 239\& BIO *mdtmp; 240\& unsigned char mdbuf[EVP_MAX_MD_SIZE]; 241\& int mdlen; 242\& int i; 243\& mdtmp = bio; /* Assume bio has previously been set up */ 244\& do { 245\& EVP_MD *md; 246\& mdtmp = BIO_find_type(mdtmp, BIO_TYPE_MD); 247\& if(!mdtmp) break; 248\& BIO_get_md(mdtmp, &md); 249\& printf("%s digest", OBJ_nid2sn(EVP_MD_type(md))); 250\& mdlen = BIO_gets(mdtmp, mdbuf, EVP_MAX_MD_SIZE); 251\& for(i = 0; i < mdlen; i++) printf(":%02X", mdbuf[i]); 252\& printf("\en"); 253\& mdtmp = BIO_next(mdtmp); 254\& } while(mdtmp); |
| 258.Ve 259.PP 260.Vb 1 | 255\& |
| 261\& BIO_free_all(bio); 262.Ve 263.SH "BUGS" 264.IX Header "BUGS" 265The lack of support for \fIBIO_puts()\fR and the non standard behaviour of 266\&\fIBIO_gets()\fR could be regarded as anomalous. It could be argued that \fIBIO_gets()\fR 267and \fIBIO_puts()\fR should be passed to the next \s-1BIO\s0 in the chain and digest 268the data passed through and that digests should be retrieved using a 269separate \fIBIO_ctrl()\fR call. 270.SH "SEE ALSO" 271.IX Header "SEE ALSO" 272\&\s-1TBA\s0 | 256\& BIO_free_all(bio); 257.Ve 258.SH "BUGS" 259.IX Header "BUGS" 260The lack of support for \fIBIO_puts()\fR and the non standard behaviour of 261\&\fIBIO_gets()\fR could be regarded as anomalous. It could be argued that \fIBIO_gets()\fR 262and \fIBIO_puts()\fR should be passed to the next \s-1BIO\s0 in the chain and digest 263the data passed through and that digests should be retrieved using a 264separate \fIBIO_ctrl()\fR call. 265.SH "SEE ALSO" 266.IX Header "SEE ALSO" 267\&\s-1TBA\s0 |