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Update crypto(7) to list current ciphers. 

Add descriptions of AES-CCM, Camellia-CBC, and Chacha20.

Reviewed by:	cem (previous version)
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D24963
This commit is contained in:
John Baldwin 2020-06-04 22:16:19 +00:00
parent 7814aaf5a9
commit 82785a3cc8
1 changed files with 60 additions and 6 deletions
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66
share/man/man7/crypto.7
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@ -27,7 +27,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd May 22, 2020
.Dd June 04, 2020
.Dt CRYPTO 7
.Os
.Sh NAME
@ -43,7 +43,7 @@ The following cryptographic algorithms that are part of the OpenCrypto
framework have the following requirements.
.Pp
Cipher algorithms:
.Bl -tag -width ".Dv CRYPTO_AES_CBC"
.Bl -tag -width "CRYPTO_AES_NIST_GCM_16"
.It Dv CRYPTO_AES_CBC
.Bl -tag -width "Block size :" -compact -offset indent
.It IV size :
@ -54,7 +54,33 @@ Cipher algorithms:
16, 24 or 32
.El
.Pp
This algorithm implements Cipher-block chaining.
This algorithm implements Cipher Block Chaining.
.It Dv CRYPTO_AES_CCM_16
.Bl -tag -width "Block size :" -compact -offset indent
.It IV size :
12
.It Block size :
16
.It Key size :
16, 24 or 32
.It Digest size :
16
.El
.Pp
This algorithm implements Counter with CBC-MAC Mode.
This cipher uses AEAD
.Pq Authenticated Encryption with Associated Data
mode.
.Pp
The authentication tag will be read from or written to the offset
.Va crp_digest_start
specified in the request.
.Pp
Note: The nonce for each request must be provided in
.Fa crp_iv
via the
.Dv CRYPTO_F_IV_SEPARATE
flag.
.It Dv CRYPTO_AES_NIST_GCM_16
.Bl -tag -width "Block size :" -compact -offset indent
.It IV size :
@ -72,11 +98,15 @@ This cipher uses AEAD
.Pq Authenticated Encryption with Associated Data
mode.
.Pp
The authentication tag will be read/written from/to the offset
The authentication tag will be read from or written to the offset
.Va crp_digest_start
specified in the request.
.Pp
Note: You must provide an IV on every call.
Note: The nonce for each request must be provided in
.Fa crp_iv
via the
.Dv CRYPTO_F_IV_SEPARATE
flag.
.It Dv CRYPTO_AES_ICM
.Bl -tag -width "Block size :" -compact -offset indent
.It IV size :
@ -95,7 +125,11 @@ This does mean that if a counter is required that rolls over at 32 bits,
the transaction need to be split into two parts where the counter rolls over.
The counter incremented as a 128-bit big endian number.
.Pp
Note: You must provide an IV on every call.
Note: The counter for each request must be provided in
.Fa crp_iv
via the
.Dv CRYPTO_F_IV_SEPARATE
flag.
.It Dv CRYPTO_AES_XTS
.Bl -tag -width "Block size :" -compact -offset indent
.It IV size :
@ -111,6 +145,26 @@ as defined in NIST SP 800-38E.
.Pp
NOTE: The ciphertext stealing part is not implemented which is why this cipher
is listed as having a block size of 16 instead of 1.
.It Dv CRYPTO_CAMELLIA_CBC
.Bl -tag -width "Block size :" -compact -offset indent
.It IV size :
16
.It Block size :
16
.It Key size :
16, 24 or 32
.El
.Pp
This algorithm implements Cipher Block Chaining.
.It Dv CRYPTO_CHACHA20
.Bl -tag -width "Block size :" -compact -offset indent
.It IV size :
16
.It Block size :
1
.It Key size :
16 or 32
.El
.El
.Sh HISTORY
The