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OpenSSLでbase64をエンコード、デコードするコマンド

f:id:tea_cat:20181014193121j:plain

エンコード

$ echo hoge | openssl base64
aG9nZQo=

デコード

$ echo aG9nZQo= | openssl base64 -d
hoge

以下のようにいろいろな形式でエンコード、デコードも可能です

エンコード

$ echo hoge |  openssl enc -e -aes-256-cbc >|a
enter aes-256-cbc encryption password:
Verifying - enter aes-256-cbc encryption password:

デコード

$ cat a |  openssl enc -d -aes-256-cbc
enter aes-256-cbc decryption password:
hoge

エンコードできる暗号方式一覧

openssl enc help
unknown option 'help'
options are
-in <file>     input file
-out <file>    output file
-pass <arg>    pass phrase source
-e             encrypt
-d             decrypt
-a/-base64     base64 encode/decode, depending on encryption flag
-k             passphrase is the next argument
-kfile         passphrase is the first line of the file argument
-md            the next argument is the md to use to create a key
                 from a passphrase. See openssl dgst -h for list.
-S             salt in hex is the next argument
-K/-iv         key/iv in hex is the next argument
-[pP]          print the iv/key (then exit if -P)
-bufsize <n>   buffer size
-nopad         disable standard block padding
-engine e      use engine e, possibly a hardware device.
Cipher Types
-aes-128-cbc               -aes-128-cbc-hmac-sha1     -aes-128-cfb
-aes-128-cfb1              -aes-128-cfb8              -aes-128-ctr
-aes-128-ecb               -aes-128-gcm               -aes-128-ofb
-aes-128-xts               -aes-192-cbc               -aes-192-cfb
-aes-192-cfb1              -aes-192-cfb8              -aes-192-ctr
-aes-192-ecb               -aes-192-gcm               -aes-192-ofb
-aes-256-cbc               -aes-256-cbc-hmac-sha1     -aes-256-cfb
-aes-256-cfb1              -aes-256-cfb8              -aes-256-ctr
-aes-256-ecb               -aes-256-gcm               -aes-256-ofb
-aes-256-xts               -aes128                    -aes192
-aes256                    -bf                        -bf-cbc
-bf-cfb                    -bf-ecb                    -bf-ofb
-blowfish                  -camellia-128-cbc          -camellia-128-cfb
-camellia-128-cfb1         -camellia-128-cfb8         -camellia-128-ecb
-camellia-128-ofb          -camellia-192-cbc          -camellia-192-cfb
-camellia-192-cfb1         -camellia-192-cfb8         -camellia-192-ecb
-camellia-192-ofb          -camellia-256-cbc          -camellia-256-cfb
-camellia-256-cfb1         -camellia-256-cfb8         -camellia-256-ecb
-camellia-256-ofb          -camellia128               -camellia192
-camellia256               -cast                      -cast-cbc
-cast5-cbc                 -cast5-cfb                 -cast5-ecb
-cast5-ofb                 -des                       -des-cbc
-des-cfb                   -des-cfb1                  -des-cfb8
-des-ecb                   -des-ede                   -des-ede-cbc
-des-ede-cfb               -des-ede-ofb               -des-ede3
-des-ede3-cbc              -des-ede3-cfb              -des-ede3-cfb1
-des-ede3-cfb8             -des-ede3-ofb              -des-ofb
-des3                      -desx                      -desx-cbc
-id-aes128-GCM             -id-aes192-GCM             -id-aes256-GCM
-idea                      -idea-cbc                  -idea-cfb
-idea-ecb                  -idea-ofb                  -rc2
-rc2-40-cbc                -rc2-64-cbc                -rc2-cbc
-rc2-cfb                   -rc2-ecb                   -rc2-ofb
-rc4                       -rc4-40                    -rc4-hmac-md5
-seed                      -seed-cbc                  -seed-cfb
-seed-ecb                  -seed-ofb