diff options
Diffstat (limited to 'secure/lib/libcrypto/man/hmac.3')
| -rw-r--r-- | secure/lib/libcrypto/man/hmac.3 | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/secure/lib/libcrypto/man/hmac.3 b/secure/lib/libcrypto/man/hmac.3 index 85e1af8..cd71e7d 100644 --- a/secure/lib/libcrypto/man/hmac.3 +++ b/secure/lib/libcrypto/man/hmac.3 @@ -1,4 +1,4 @@ -.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.30) +.\" Automatically generated by Pod::Man 2.28 (Pod::Simple 3.28) .\" .\" Standard preamble: .\" ======================================================================== @@ -133,7 +133,7 @@ .\" ======================================================================== .\" .IX Title "hmac 3" -.TH hmac 3 "2016-05-03" "1.0.2h" "OpenSSL" +.TH hmac 3 "2016-09-22" "1.0.2i" "OpenSSL" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l @@ -197,13 +197,17 @@ function \fBevp_md\fR and the key \fBkey\fR which is \fBkey_len\fR bytes long. It is deprecated and only included for backward compatibility with OpenSSL 0.9.6b. .PP -\&\fIHMAC_Init_ex()\fR initializes or reuses a \fB\s-1HMAC_CTX\s0\fR structure to use -the function \fBevp_md\fR and key \fBkey\fR. Either can be \s-1NULL,\s0 in which -case the existing one will be reused. \fIHMAC_CTX_init()\fR must have been -called before the first use of an \fB\s-1HMAC_CTX\s0\fR in this -function. \fBN.B. \f(BIHMAC_Init()\fB had this undocumented behaviour in -previous versions of OpenSSL \- failure to switch to \f(BIHMAC_Init_ex()\fB in -programs that expect it will cause them to stop working\fR. +\&\fIHMAC_Init_ex()\fR initializes or reuses a \fB\s-1HMAC_CTX\s0\fR structure to use the hash +function \fBevp_md\fR and key \fBkey\fR. If both are \s-1NULL \s0(or \fBevp_md\fR is the same +as the previous digest used by \fBctx\fR and \fBkey\fR is \s-1NULL\s0) the existing key is +reused. \fBctx\fR must have been created with \fIHMAC_CTX_new()\fR before the first use +of an \fB\s-1HMAC_CTX\s0\fR in this function. \fBN.B. \f(BIHMAC_Init()\fB had this undocumented +behaviour in previous versions of OpenSSL \- failure to switch to \f(BIHMAC_Init_ex()\fB +in programs that expect it will cause them to stop working\fR. +.PP +\&\fB\s-1NB:\s0 if \f(BIHMAC_Init_ex()\fB is called with \fBkey\fB \s-1NULL\s0 and \fBevp_md\fB is not the +same as the previous digest used by \fBctx\fB then an error is returned +because reuse of an existing key with a different digest is not supported.\fR .PP \&\fIHMAC_Update()\fR can be called repeatedly with chunks of the message to be authenticated (\fBlen\fR bytes at \fBdata\fR). |
