Cancel OpenSSL RSA key generation via command line

Question

I'm running macOS 10.12.1 with OpenSSL 0.9.8zh 14 Jan 2016

When generating an RSA key with the OpenSSL cli you are prompted to enter your passphrase.

With most command-line interfaces pressing C-d or C-c will exit the process; however, with openssl it seems like it's impossible to exit the program once you've started the key generation process.

Shown below is a session where I'm trying C-c and C-d, only after entering foobar twice do I exit:

$ openssl genrsa -aes128 -out fd.key 2048
Generating RSA private key, 2048 bit long modulus
.........+++
.................................................+++
e is 65537 (0x10001)
Enter pass phrase for fd.key:
73496:error:28069065:lib(40):UI_set_result:result too small:/BuildRoot/Library/Caches/com.apple.xbs/Sources/OpenSSL098/OpenSSL098-64/src/crypto/ui/ui_lib.c:850:You must type in 4 to 1023 characters
Enter pass phrase for fd.key:
73496:error:28069065:lib(40):UI_set_result:result too small:/BuildRoot/Library/Caches/com.apple.xbs/Sources/OpenSSL098/OpenSSL098-64/src/crypto/ui/ui_lib.c:850:You must type in 4 to 1023 characters
Enter pass phrase for fd.key:
Enter pass phrase for fd.key:
Enter pass phrase for fd.key:
Enter pass phrase for fd.key:
Enter pass phrase for fd.key:
Enter pass phrase for fd.key:
Verifying - Enter pass phrase for fd.key:

• How do I exit the genrsa openssl command?