diff options
Diffstat (limited to 'lib/libcrypto/man/EVP_des_cbc.3')
| -rw-r--r-- | lib/libcrypto/man/EVP_des_cbc.3 | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/libcrypto/man/EVP_des_cbc.3 b/lib/libcrypto/man/EVP_des_cbc.3 index 759e03fac0b..7c8a08c7dbe 100644 --- a/lib/libcrypto/man/EVP_des_cbc.3 +++ b/lib/libcrypto/man/EVP_des_cbc.3 @@ -1,4 +1,4 @@ -.\" $OpenBSD: EVP_des_cbc.3,v 1.1 2019/03/21 12:54:37 schwarze Exp $ +.\" $OpenBSD: EVP_des_cbc.3,v 1.2 2024/11/09 22:03:49 schwarze Exp $ .\" full merge up to: .\" OpenSSL EVP_desx_cbc.pod 8fa4d95e Oct 21 11:59:09 2017 +0900 .\" selective merge up to: @@ -51,7 +51,7 @@ .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" -.Dd $Mdocdate: March 21 2019 $ +.Dd $Mdocdate: November 9 2024 $ .Dt EVP_DES_CBC 3 .Os .Sh NAME @@ -128,6 +128,15 @@ These functions provide the DES encryption algorithm in the .Xr evp 3 framework. +DES is a block cipher operating on 64 bit blocks. +The key length to be used for +.Xr EVP_EncryptInit 3 +is 64 bits. +However, only 56 of these bits are used in the encryption algorithm. +The least significant bit in each of the eight bytes is only used +for checking parity. +Using this algorithm is discouraged because the short key length +makes it vulnerable to brute force attacks. .Pp .Fn EVP_des_cbc , .Fn EVP_des_cfb1 , |