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ECPrivacy

Why

Grandpa, what did you do when PGP was bloated intentionally to block people from using encryption?

Warning

Not tested at all. Do not use this as a replacement for battle-tested programs.

Encryption

ECPrivacy uses Eliptic Curve Cryptography with libsodium.

For signing and verifying, a twisted edwards curve variant Ed25519 is used. For encryption and decryption, a Montgomery curve variant Curve25519 implementation X25519, stream cipher XSalsa20, and Poly1305 MAC is used. Since Curve25519 is birationally equivalent with Ed25519, a single key pair can be used for both encryption and sign operation.

Install

You need gcc, libsodium and libsodium headers to compile.

dnf install gcc libsodium libsodium-devel
git clone https://github.com/moonsikpark/ecprivacy.git
cd ecprivacy
gcc -o ecprivacy src/ecprivacy.c -lsodium
cp ecprivacy /usr/bin

Syntax

Syntax: ecprivacy [command]

Commands:
 help                                           Show this help text
 genkey                                         Generate a new key pair
 sign    [my privatekey]                        Sign message
 verify                                         Verify message
 encrypt [receiver's publickey] [my privatekey] Encrypt message
 decrypt [my privatekey]                        Decrypt message

Usage

Keypair generation

[alice@test ~]# ecprivacy genkey
ecprivacy 0.1alpha

A new keypair has been generated.

Public key: pubI2GqdwLLa9io9ofTsDG6h4MMLtHRuo5ptMlQSGIZ3LQ=pub
Private key: privHfANEdqs0o7j2lCjkO8aBCGfAdLwgu0Ga7wzp43vdQjYap3Astr2Kj2h9OwMbqHgwwu0dG6jmm0yVBIYhnctA==pri

Signing

[alice@test ~]# ecprivacy sign privHfANEdqs0o7j2lCjkO8aBCGfAdLwgu0Ga7wzp43vdQjYap3Astr2Kj2h9OwMbqHgwwu0dG6jmm0yVBIYhnctA==pri
ecprivacy 0.1alpha

Please enter the message; To finish, press Enter, then EOF(Ctrl + D).

Hello World!


Your message has been signed.

===ECPRIVACY SIGNED MESSAGE===
Hello World!


/s/pubI2GqdwLLa9io9ofTsDG6h4MMLtHRuo5ptMlQSGIZ3LQ=pub/
/xvNqy8aV25ihNTDzVG9oDN1RqVRBGA16Jv-WoKfZMXQYPJtqiM0NP5j4F5eTMl0OA2AagxXp13wo32d739RoAQ==/
===END MESSAGE===

Verifying

[bob@test ~]# ecprivacy verify
ecprivacy 0.1alpha

Please enter the message to verify; To finish, press Enter, then EOF(Ctrl + D).

===ECPRIVACY SIGNED MESSAGE===
Hello World!


/s/pubI2GqdwLLa9io9ofTsDG6h4MMLtHRuo5ptMlQSGIZ3LQ=pub/
/xvNqy8aV25ihNTDzVG9oDN1RqVRBGA16Jv-WoKfZMXQYPJtqiM0NP5j4F5eTMl0OA2AagxXp13wo32d739RoAQ==/
===END MESSAGE===


Message is verified and is the exact copy.
[bob@test ~]# ecprivacy verify
ecprivacy 0.1alpha

Please enter the message to verify; To finish, press Enter, then EOF(Ctrl + D).

===ECPRIVACY SIGNED MESSAGE===
Hello World.


/s/pubI2GqdwLLa9io9ofTsDG6h4MMLtHRuo5ptMlQSGIZ3LQ=pub/
/xvNqy8aV25ihNTDzVG9oDN1RqVRBGA16Jv-WoKfZMXQYPJtqiM0NP5j4F5eTMl0OA2AagxXp13wo32d739RoAQ==/
===END MESSAGE===


WARNING! Message is not verified. It might have been tampered with or not signed by the key holder.

Encrypting

[bob@test ~]# ecprivacy genkey
ecprivacy 0.1alpha

A new keypair has been generated.

Public key: pub7JTQXp02LDNzTBK7EPGYxwfVzZcXNy8En05sp6Rw0p4=pub
Private key: priUbhSdleGCS2cXJhV6NS5g2tzlSd0hnNzJ3wKZ3Kw9KXslNBenTYsM3NMErsQ8ZjHB9XNlxc3LwSfTmynpHDSng==pri

[alice@test ~]# ecprivacy encrypt pub7JTQXp02LDNzTBK7EPGYxwfVzZcXNy8En05sp6Rw0p4=pub privHfANEdqs0o7j2lCjkO8aBCGfAdLwgu0Ga7wzp43vdQjYap3Astr2Kj2h9OwMbqHgwwu0dG6jmm0yVBIYhnctA==pri
ecprivacy 0.1alpha

Please enter the message to encrypt; To finish, press Enter, then EOF(Ctrl + D).

Hello World!


Your message has been encrypted.

===ECPRIVACY ENCRYPTED MESSAGE===
ZWFocmd0cmRlZmhiZHJzZnRoYnRmcmRhd3JzZWdiaG
FTUldFaGRndHllYXJobmJkdHJneWhqYXRlZGdmaGIg
ZnhkZXRhIG5qaGJlYXQ0NmpodWFldGQ0aGJkZnRlcj
VnaGVkcnQ1aA==
===END MESSAGE===

Decrypting

[bob@test ~]# ecprivacy decrypt priUbhSdleGCS2cXJhV6NS5g2tzlSd0hnNzJ3wKZ3Kw9KXslNBenTYsM3NMErsQ8ZjHB9XNlxc3LwSfTmynpHDSng==pri
ecprivacy 0.1alpha

Please enter the message to decrypt; To finish, press Enter, then EOF(Ctrl + D).

===ECPRIVACY ENCRYPTED MESSAGE===
ZWFocmd0cmRlZmhiZHJzZnRoYnRmcmRhd3JzZWdiaG
FTUldFaGRndHllYXJobmJkdHJneWhqYXRlZGdmaGIg
ZnhkZXRhIG5qaGJlYXQ0NmpodWFldGQ0aGJkZnRlcj
VnaGVkcnQ1aA==
===END MESSAGE===


Your message has been decrypted.

Hello World!