crypto

MODULE

crypto

MODULE SUMMARY

Crypto Functions

DESCRIPTION

This module provides a set of cryptographic functions.

References:

• md5: The MD5 Message Digest Algorithm (RFC 1321)
  
• sha: Secure Hash Standard (FIPS 180-1)
  
• hmac: Keyed-Hashing for Message Authentication (RFC 2104)
  
• des: Data Encryption Standard (FIPS 46-2)
  
• ecb, cbc, cfb, ofb: DES modes of operation (FIPS 81).
  

Types

byte() = 0 ... 255
ioelem() = byte() | binary() | iolist()
iolist() = [ioelem()]
    

EXPORTS

start() -> ok

Starts the crypto server.

stop() -> ok

Stops the crypto server.

info() -> [atom()]

Stops the crypto server.

md5(Data) -> Digest

Types:
Data = iolist() | binary()
Digest = binary()

Computes an MD5 message digest from Data, where the length of the digest is 128 bits (16 bytes).

md5_init() -> Context

Types:
Context = binary()

Creates an MD5 context, to be used in subsequent calls to md5_update/2.

md5_update(Context, Data) -> NewContext

Types:
Data = iolist() | binary()
Context = NewContext = binary()

Updates an MD5 Context with Data, and returns a NewContext.

md5_finish(Context) -> Digest

Types:
Context = Digest = binary()

Finishes the update of an MD5 Context and returns the computed MD5 message digest.

sha(Data) -> Digest

Types:
Data = iolist() | binary()
Digest = binary()

Computes an SHA message digest from Data, where the length of the digest is 160 bits (20 bytes).

XXX Should have sha_[init|update|finish] too.

sha_init() -> Context

Types:
Context = binary()

Creates an SHA context, to be used in subsequent calls to sha_update/2.

sha_update(Context, Data) -> NewContext

Types:
Data = iolist() | binary()
Context = NewContext = binary()

Updates an SHA Context with Data, and returns a NewContext.

sha_finish(Context) -> Digest

Types:
Context = Digest = binary()

Finishes the update of an SHA Context and returns the computed SHA message digest.

md5_mac(Key, Data) -> Mac

Types:
Key = Data = iolist() | binary()
Mac = binary()

Computes an MD5 MAC message authentification code from Key and Data, where the the length of the Mac is 128 bits (16 bytes).

md5_mac_96(Key, Data) -> Mac

Types:
Key = Data = iolist() | binary()
Mac = binary()

Computes an MD5 MAC message authentification code from Key and Data, where the length of the Mac is 96 bits (12 bytes).

sha_mac(Key, Data) -> Mac

Types:
Key = Data = iolist() | binary()
Mac = binary()

Computes an SHA MAC message authentification code from Key and Data, where the length of the Mac is 160 bits (20 bytes).

sha_mac_96(Key, Data) -> Mac

Types:
Key = Data = iolist() | binary()
Mac = binary()

Computes an SHA MAC message authentification code from Key and Data, where the length of the Mac is 96 bits (12 bytes).

des_cbc_encrypt(Key, IVec, Text) -> Cipher

Types:
Key = Text = iolist() | binary()
IVec = Cipher = binary()

Encrypts Text according to DES in CBC mode. Text must be a multiple of 64 bits (8 bytes). The lengths of Key and IVec must be 64 bits (8 bytes).

des_cbc_decrypt(Key, IVec, Cipher) -> Text

Types:
Key = Cipher = iolist() | binary()
IVec = Text = binary()

Decrypts Cipher according to DES in CBC mode. Cipher must be a multiple of 64 bits (8 bytes). The lengths of Key and IVec must be 64 bits (8 bytes).

AUTHORS

Peter Högfeldt - support@erlang.ericsson.se