encrypt/decrypt a buffer in a C program

[cweng]

What function call can I use to encrypt and decrypt a buffer of 128 bytes in a C program ? The only requirement is that the buffer must be encrypted with ASCII code. Because I will printf the encrypted buffer and I want people to be able to cut and paste it. Thanks.

[Yatima]

Sounds like you want to encrypt, then hexdump.

Try "man 3 openssl" to get the possible C functions.

For example "man 3 blowfish" for blowfish encryption.

For the dump, roll your own or use for example "man BIO_f_base64" to learn about base64 encoding

Best luck.

[cweng]

Does blowfish encrypt the buffer with ASCII key ? Because I want to able to printf the whole encrypted buffer ...

[Yatima]

No, you have to separate these two problems.

Any encrypt/decrypt transform some byte array into another byte array. But to print, you can do
something simple like using printf("%x",array[i]) over the array.

Work with a byte array - then output using printf %x, transforming bytes to text.

Same the other way:

Input using scanf %x - then work with the byte array.