| EVP_BytesToKey.3 (206048) | EVP_BytesToKey.3 (215698) |
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| 132.TH EVP_BytesToKey 3 "2010-03-24" "0.9.8n" "OpenSSL" | 127.TH EVP_BytesToKey 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" 134EVP_BytesToKey \- password based encryption routine 135.SH "SYNOPSIS" 136.IX Header "SYNOPSIS" 137.Vb 1 138\& #include <openssl/evp.h> | 132.SH "NAME" 133EVP_BytesToKey \- password based encryption routine 134.SH "SYNOPSIS" 135.IX Header "SYNOPSIS" 136.Vb 1 137\& #include <openssl/evp.h> |
| 139.Ve 140.PP 141.Vb 4 | 138\& |
| 142\& int EVP_BytesToKey(const EVP_CIPHER *type,const EVP_MD *md, 143\& const unsigned char *salt, 144\& const unsigned char *data, int datal, int count, 145\& unsigned char *key,unsigned char *iv); 146.Ve 147.SH "DESCRIPTION" 148.IX Header "DESCRIPTION" 149\&\fIEVP_BytesToKey()\fR derives a key and \s-1IV\s0 from various parameters. \fBtype\fR is --- 19 unchanged lines hidden (view full) --- 169Newer applications should use more standard algorithms such as PKCS#5 170v2.0 for key derivation. 171.SH "KEY DERIVATION ALGORITHM" 172.IX Header "KEY DERIVATION ALGORITHM" 173The key and \s-1IV\s0 is derived by concatenating D_1, D_2, etc until 174enough data is available for the key and \s-1IV\s0. D_i is defined as: 175.PP 176.Vb 1 | 139\& int EVP_BytesToKey(const EVP_CIPHER *type,const EVP_MD *md, 140\& const unsigned char *salt, 141\& const unsigned char *data, int datal, int count, 142\& unsigned char *key,unsigned char *iv); 143.Ve 144.SH "DESCRIPTION" 145.IX Header "DESCRIPTION" 146\&\fIEVP_BytesToKey()\fR derives a key and \s-1IV\s0 from various parameters. \fBtype\fR is --- 19 unchanged lines hidden (view full) --- 166Newer applications should use more standard algorithms such as PKCS#5 167v2.0 for key derivation. 168.SH "KEY DERIVATION ALGORITHM" 169.IX Header "KEY DERIVATION ALGORITHM" 170The key and \s-1IV\s0 is derived by concatenating D_1, D_2, etc until 171enough data is available for the key and \s-1IV\s0. D_i is defined as: 172.PP 173.Vb 1 |
| 177\& D_i = HASH^count(D_(i-1) || data || salt) | 174\& D_i = HASH^count(D_(i\-1) || data || salt) |
| 178.Ve 179.PP 180where || denotes concatentaion, D_0 is empty, \s-1HASH\s0 is the digest 181algorithm in use, HASH^1(data) is simply \s-1HASH\s0(data), HASH^2(data) 182is \s-1HASH\s0(\s-1HASH\s0(data)) and so on. 183.PP 184The initial bytes are used for the key and the subsequent bytes for 185the \s-1IV\s0. 186.SH "RETURN VALUES" 187.IX Header "RETURN VALUES" 188\&\fIEVP_BytesToKey()\fR returns the size of the derived key in bytes. 189.SH "SEE ALSO" 190.IX Header "SEE ALSO" 191\&\fIevp\fR\|(3), \fIrand\fR\|(3), 192\&\fIEVP_EncryptInit\fR\|(3) 193.SH "HISTORY" 194.IX Header "HISTORY" | 175.Ve 176.PP 177where || denotes concatentaion, D_0 is empty, \s-1HASH\s0 is the digest 178algorithm in use, HASH^1(data) is simply \s-1HASH\s0(data), HASH^2(data) 179is \s-1HASH\s0(\s-1HASH\s0(data)) and so on. 180.PP 181The initial bytes are used for the key and the subsequent bytes for 182the \s-1IV\s0. 183.SH "RETURN VALUES" 184.IX Header "RETURN VALUES" 185\&\fIEVP_BytesToKey()\fR returns the size of the derived key in bytes. 186.SH "SEE ALSO" 187.IX Header "SEE ALSO" 188\&\fIevp\fR\|(3), \fIrand\fR\|(3), 189\&\fIEVP_EncryptInit\fR\|(3) 190.SH "HISTORY" 191.IX Header "HISTORY" |