openssl加密解密文件

openssl enc --help

Usage: enc [options]
Valid options are:
 -help          Display this summary
 -ciphers       List ciphers
 -in infile     Input file
 -out outfile   Output file
 -pass val      Passphrase source
 -e             Encrypt
 -d             Decrypt
 -p             Print the iv/key
 -P             Print the iv/key and exit
 -v             Verbose output
 -nopad         Disable standard block padding
 -salt          Use salt in the KDF (default)
 -nosalt        Do not use salt in the KDF
 -debug         Print debug info
 -a             Base64 encode/decode, depending on encryption flag
 -base64        Same as option -a
 -A             Used with -[base64|a] to specify base64 buffer as a single line
 -bufsize val   Buffer size
 -k val         Passphrase
 -kfile infile  Read passphrase from file
 -K val         Raw key, in hex
 -S val         Salt, in hex
 -iv val        IV in hex
 -md val        Use specified digest to create a key from the passphrase
 -none          Don't encrypt
 -*             Any supported cipher
 -engine val    Use engine, possibly a hardware device

openssl enc -e -in test -out test.enc  -p -k 123 -aes256

openssl enc -d  -in test.enc -out test -aes256 -k 123