[CRYPTO] api: Split out low-level API
The crypto API is made up of the part facing users such as IPsec and the low-level part which is used by cryptographic entities such as algorithms. This patch splits out the latter so that the two APIs are more clearly delineated. As a bonus the low-level API can now be modularised if all algorithms are built as modules. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
9409f38a0c
commit
cce9e06d10
8 changed files with 204 additions and 134 deletions
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@ -9,47 +9,54 @@ config CRYPTO
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help
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This option provides the core Cryptographic API.
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if CRYPTO
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config CRYPTO_ALGAPI
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tristate
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help
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This option provides the API for cryptographic algorithms.
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config CRYPTO_HMAC
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bool "HMAC support"
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depends on CRYPTO
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help
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HMAC: Keyed-Hashing for Message Authentication (RFC2104).
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This is required for IPSec.
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config CRYPTO_NULL
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tristate "Null algorithms"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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These are 'Null' algorithms, used by IPsec, which do nothing.
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config CRYPTO_MD4
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tristate "MD4 digest algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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MD4 message digest algorithm (RFC1320).
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config CRYPTO_MD5
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tristate "MD5 digest algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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MD5 message digest algorithm (RFC1321).
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config CRYPTO_SHA1
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tristate "SHA1 digest algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
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config CRYPTO_SHA1_S390
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tristate "SHA1 digest algorithm (s390)"
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depends on CRYPTO && S390
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depends on S390
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select CRYPTO_ALGAPI
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help
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This is the s390 hardware accelerated implementation of the
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SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
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config CRYPTO_SHA256
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tristate "SHA256 digest algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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SHA256 secure hash standard (DFIPS 180-2).
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@ -58,7 +65,8 @@ config CRYPTO_SHA256
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config CRYPTO_SHA256_S390
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tristate "SHA256 digest algorithm (s390)"
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depends on CRYPTO && S390
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depends on S390
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select CRYPTO_ALGAPI
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help
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This is the s390 hardware accelerated implementation of the
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SHA256 secure hash standard (DFIPS 180-2).
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@ -68,7 +76,7 @@ config CRYPTO_SHA256_S390
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config CRYPTO_SHA512
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tristate "SHA384 and SHA512 digest algorithms"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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SHA512 secure hash standard (DFIPS 180-2).
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@ -80,7 +88,7 @@ config CRYPTO_SHA512
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config CRYPTO_WP512
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tristate "Whirlpool digest algorithms"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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Whirlpool hash algorithm 512, 384 and 256-bit hashes
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@ -92,7 +100,7 @@ config CRYPTO_WP512
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config CRYPTO_TGR192
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tristate "Tiger digest algorithms"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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Tiger hash algorithm 192, 160 and 128-bit hashes
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@ -105,19 +113,20 @@ config CRYPTO_TGR192
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config CRYPTO_DES
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tristate "DES and Triple DES EDE cipher algorithms"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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DES cipher algorithm (FIPS 46-2), and Triple DES EDE (FIPS 46-3).
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config CRYPTO_DES_S390
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tristate "DES and Triple DES cipher algorithms (s390)"
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depends on CRYPTO && S390
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depends on S390
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select CRYPTO_ALGAPI
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help
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DES cipher algorithm (FIPS 46-2), and Triple DES EDE (FIPS 46-3).
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config CRYPTO_BLOWFISH
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tristate "Blowfish cipher algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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Blowfish cipher algorithm, by Bruce Schneier.
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@ -130,7 +139,7 @@ config CRYPTO_BLOWFISH
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config CRYPTO_TWOFISH
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tristate "Twofish cipher algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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select CRYPTO_TWOFISH_COMMON
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help
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Twofish cipher algorithm.
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@ -145,14 +154,14 @@ config CRYPTO_TWOFISH
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config CRYPTO_TWOFISH_COMMON
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tristate
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depends on CRYPTO
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help
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Common parts of the Twofish cipher algorithm shared by the
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generic c and the assembler implementations.
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config CRYPTO_TWOFISH_586
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tristate "Twofish cipher algorithms (i586)"
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depends on CRYPTO && ((X86 || UML_X86) && !64BIT)
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depends on (X86 || UML_X86) && !64BIT
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select CRYPTO_ALGAPI
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select CRYPTO_TWOFISH_COMMON
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help
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Twofish cipher algorithm.
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@ -167,7 +176,8 @@ config CRYPTO_TWOFISH_586
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config CRYPTO_TWOFISH_X86_64
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tristate "Twofish cipher algorithm (x86_64)"
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depends on CRYPTO && ((X86 || UML_X86) && 64BIT)
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depends on (X86 || UML_X86) && 64BIT
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select CRYPTO_ALGAPI
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select CRYPTO_TWOFISH_COMMON
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help
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Twofish cipher algorithm (x86_64).
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@ -182,7 +192,7 @@ config CRYPTO_TWOFISH_X86_64
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config CRYPTO_SERPENT
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tristate "Serpent cipher algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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Serpent cipher algorithm, by Anderson, Biham & Knudsen.
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@ -195,7 +205,7 @@ config CRYPTO_SERPENT
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config CRYPTO_AES
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tristate "AES cipher algorithms"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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AES cipher algorithms (FIPS-197). AES uses the Rijndael
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algorithm.
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@ -215,7 +225,8 @@ config CRYPTO_AES
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config CRYPTO_AES_586
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tristate "AES cipher algorithms (i586)"
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depends on CRYPTO && ((X86 || UML_X86) && !64BIT)
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depends on (X86 || UML_X86) && !64BIT
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select CRYPTO_ALGAPI
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help
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AES cipher algorithms (FIPS-197). AES uses the Rijndael
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algorithm.
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@ -235,7 +246,8 @@ config CRYPTO_AES_586
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config CRYPTO_AES_X86_64
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tristate "AES cipher algorithms (x86_64)"
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depends on CRYPTO && ((X86 || UML_X86) && 64BIT)
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depends on (X86 || UML_X86) && 64BIT
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select CRYPTO_ALGAPI
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help
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AES cipher algorithms (FIPS-197). AES uses the Rijndael
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algorithm.
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@ -255,7 +267,8 @@ config CRYPTO_AES_X86_64
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config CRYPTO_AES_S390
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tristate "AES cipher algorithms (s390)"
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depends on CRYPTO && S390
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depends on S390
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select CRYPTO_ALGAPI
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help
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This is the s390 hardware accelerated implementation of the
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AES cipher algorithms (FIPS-197). AES uses the Rijndael
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@ -275,21 +288,21 @@ config CRYPTO_AES_S390
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config CRYPTO_CAST5
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tristate "CAST5 (CAST-128) cipher algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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The CAST5 encryption algorithm (synonymous with CAST-128) is
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described in RFC2144.
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config CRYPTO_CAST6
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tristate "CAST6 (CAST-256) cipher algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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The CAST6 encryption algorithm (synonymous with CAST-256) is
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described in RFC2612.
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config CRYPTO_TEA
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tristate "TEA, XTEA and XETA cipher algorithms"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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TEA cipher algorithm.
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@ -306,7 +319,7 @@ config CRYPTO_TEA
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config CRYPTO_ARC4
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tristate "ARC4 cipher algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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ARC4 cipher algorithm.
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@ -317,7 +330,7 @@ config CRYPTO_ARC4
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config CRYPTO_KHAZAD
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tristate "Khazad cipher algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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Khazad cipher algorithm.
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@ -330,7 +343,7 @@ config CRYPTO_KHAZAD
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config CRYPTO_ANUBIS
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tristate "Anubis cipher algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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Anubis cipher algorithm.
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@ -345,7 +358,7 @@ config CRYPTO_ANUBIS
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config CRYPTO_DEFLATE
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tristate "Deflate compression algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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select ZLIB_INFLATE
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select ZLIB_DEFLATE
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help
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@ -356,7 +369,7 @@ config CRYPTO_DEFLATE
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config CRYPTO_MICHAEL_MIC
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tristate "Michael MIC keyed digest algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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help
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Michael MIC is used for message integrity protection in TKIP
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(IEEE 802.11i). This algorithm is required for TKIP, but it
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@ -365,7 +378,7 @@ config CRYPTO_MICHAEL_MIC
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config CRYPTO_CRC32C
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tristate "CRC32c CRC algorithm"
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depends on CRYPTO
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select CRYPTO_ALGAPI
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select LIBCRC32C
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help
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Castagnoli, et al Cyclic Redundancy-Check Algorithm. Used
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@ -375,10 +388,13 @@ config CRYPTO_CRC32C
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config CRYPTO_TEST
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tristate "Testing module"
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depends on CRYPTO && m
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depends on m
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select CRYPTO_ALGAPI
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help
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Quick & dirty crypto test module.
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source "drivers/crypto/Kconfig"
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endmenu
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endif # if CRYPTO
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endmenu
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@ -2,10 +2,11 @@
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# Cryptographic API
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#
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proc-crypto-$(CONFIG_PROC_FS) = proc.o
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obj-$(CONFIG_CRYPTO) += api.o scatterwalk.o cipher.o digest.o compress.o
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obj-$(CONFIG_CRYPTO) += api.o scatterwalk.o cipher.o digest.o compress.o \
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$(proc-crypto-y)
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crypto_algapi-$(CONFIG_PROC_FS) += proc.o
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crypto_algapi-objs := algapi.o $(crypto_algapi-y)
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obj-$(CONFIG_CRYPTO_ALGAPI) += crypto_algapi.o
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obj-$(CONFIG_CRYPTO_HMAC) += hmac.o
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obj-$(CONFIG_CRYPTO_NULL) += crypto_null.o
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118
crypto/algapi.c
Normal file
118
crypto/algapi.c
Normal file
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@ -0,0 +1,118 @@
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/*
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* Cryptographic API for algorithms (i.e., low-level API).
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include "internal.h"
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static inline int crypto_set_driver_name(struct crypto_alg *alg)
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{
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static const char suffix[] = "-generic";
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char *driver_name = alg->cra_driver_name;
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int len;
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if (*driver_name)
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return 0;
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len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
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return -ENAMETOOLONG;
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memcpy(driver_name + len, suffix, sizeof(suffix));
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return 0;
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}
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int crypto_register_alg(struct crypto_alg *alg)
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{
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int ret;
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struct crypto_alg *q;
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if (alg->cra_alignmask & (alg->cra_alignmask + 1))
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return -EINVAL;
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if (alg->cra_alignmask & alg->cra_blocksize)
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return -EINVAL;
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if (alg->cra_blocksize > PAGE_SIZE / 8)
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return -EINVAL;
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if (alg->cra_priority < 0)
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return -EINVAL;
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ret = crypto_set_driver_name(alg);
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if (unlikely(ret))
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return ret;
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down_write(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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if (q == alg) {
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ret = -EEXIST;
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goto out;
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}
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}
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list_add(&alg->cra_list, &crypto_alg_list);
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atomic_set(&alg->cra_refcnt, 1);
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out:
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up_write(&crypto_alg_sem);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_register_alg);
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int crypto_unregister_alg(struct crypto_alg *alg)
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{
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int ret = -ENOENT;
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struct crypto_alg *q;
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down_write(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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if (alg == q) {
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list_del(&alg->cra_list);
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ret = 0;
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goto out;
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}
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}
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out:
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up_write(&crypto_alg_sem);
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if (ret)
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return ret;
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BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
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if (alg->cra_destroy)
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alg->cra_destroy(alg);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_alg);
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static int __init crypto_algapi_init(void)
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{
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crypto_init_proc();
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return 0;
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}
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static void __exit crypto_algapi_exit(void)
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{
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crypto_exit_proc();
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}
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module_init(crypto_algapi_init);
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module_exit(crypto_algapi_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Cryptographic algorithms API");
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97
crypto/api.c
97
crypto/api.c
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@ -15,19 +15,17 @@
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*
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*/
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#include <linux/compiler.h>
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#include <linux/init.h>
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#include <linux/crypto.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/rwsem.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include "internal.h"
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LIST_HEAD(crypto_alg_list);
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EXPORT_SYMBOL_GPL(crypto_alg_list);
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DECLARE_RWSEM(crypto_alg_sem);
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EXPORT_SYMBOL_GPL(crypto_alg_sem);
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static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
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{
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@ -239,86 +237,6 @@ void crypto_free_tfm(struct crypto_tfm *tfm)
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kfree(tfm);
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}
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static inline int crypto_set_driver_name(struct crypto_alg *alg)
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{
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static const char suffix[] = "-generic";
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char *driver_name = alg->cra_driver_name;
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int len;
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if (*driver_name)
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return 0;
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len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
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return -ENAMETOOLONG;
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memcpy(driver_name + len, suffix, sizeof(suffix));
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return 0;
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}
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int crypto_register_alg(struct crypto_alg *alg)
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{
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int ret;
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struct crypto_alg *q;
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if (alg->cra_alignmask & (alg->cra_alignmask + 1))
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return -EINVAL;
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|
||||
if (alg->cra_alignmask & alg->cra_blocksize)
|
||||
return -EINVAL;
|
||||
|
||||
if (alg->cra_blocksize > PAGE_SIZE / 8)
|
||||
return -EINVAL;
|
||||
|
||||
if (alg->cra_priority < 0)
|
||||
return -EINVAL;
|
||||
|
||||
ret = crypto_set_driver_name(alg);
|
||||
if (unlikely(ret))
|
||||
return ret;
|
||||
|
||||
down_write(&crypto_alg_sem);
|
||||
|
||||
list_for_each_entry(q, &crypto_alg_list, cra_list) {
|
||||
if (q == alg) {
|
||||
ret = -EEXIST;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
list_add(&alg->cra_list, &crypto_alg_list);
|
||||
atomic_set(&alg->cra_refcnt, 1);
|
||||
out:
|
||||
up_write(&crypto_alg_sem);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int crypto_unregister_alg(struct crypto_alg *alg)
|
||||
{
|
||||
int ret = -ENOENT;
|
||||
struct crypto_alg *q;
|
||||
|
||||
down_write(&crypto_alg_sem);
|
||||
list_for_each_entry(q, &crypto_alg_list, cra_list) {
|
||||
if (alg == q) {
|
||||
list_del(&alg->cra_list);
|
||||
ret = 0;
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
out:
|
||||
up_write(&crypto_alg_sem);
|
||||
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
|
||||
if (alg->cra_destroy)
|
||||
alg->cra_destroy(alg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int crypto_alg_available(const char *name, u32 flags)
|
||||
{
|
||||
int ret = 0;
|
||||
|
|
@ -332,17 +250,6 @@ int crypto_alg_available(const char *name, u32 flags)
|
|||
return ret;
|
||||
}
|
||||
|
||||
static int __init init_crypto(void)
|
||||
{
|
||||
printk(KERN_INFO "Initializing Cryptographic API\n");
|
||||
crypto_init_proc();
|
||||
return 0;
|
||||
}
|
||||
|
||||
__initcall(init_crypto);
|
||||
|
||||
EXPORT_SYMBOL_GPL(crypto_register_alg);
|
||||
EXPORT_SYMBOL_GPL(crypto_unregister_alg);
|
||||
EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
|
||||
EXPORT_SYMBOL_GPL(crypto_free_tfm);
|
||||
EXPORT_SYMBOL_GPL(crypto_alg_available);
|
||||
|
|
|
|||
|
|
@ -12,7 +12,8 @@
|
|||
*/
|
||||
#ifndef _CRYPTO_INTERNAL_H
|
||||
#define _CRYPTO_INTERNAL_H
|
||||
#include <linux/crypto.h>
|
||||
|
||||
#include <crypto/algapi.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/interrupt.h>
|
||||
|
|
@ -64,9 +65,12 @@ static inline void crypto_free_hmac_block(struct crypto_tfm *tfm)
|
|||
|
||||
#ifdef CONFIG_PROC_FS
|
||||
void __init crypto_init_proc(void);
|
||||
void __exit crypto_exit_proc(void);
|
||||
#else
|
||||
static inline void crypto_init_proc(void)
|
||||
{ }
|
||||
static inline void crypto_exit_proc(void)
|
||||
{ }
|
||||
#endif
|
||||
|
||||
static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg,
|
||||
|
|
|
|||
|
|
@ -113,3 +113,8 @@ void __init crypto_init_proc(void)
|
|||
if (proc)
|
||||
proc->proc_fops = &proc_crypto_ops;
|
||||
}
|
||||
|
||||
void __exit crypto_exit_proc(void)
|
||||
{
|
||||
remove_proc_entry("crypto", NULL);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -2,7 +2,8 @@ menu "Hardware crypto devices"
|
|||
|
||||
config CRYPTO_DEV_PADLOCK
|
||||
tristate "Support for VIA PadLock ACE"
|
||||
depends on CRYPTO && X86_32
|
||||
depends on X86_32
|
||||
select CRYPTO_ALGAPI
|
||||
help
|
||||
Some VIA processors come with an integrated crypto engine
|
||||
(so called VIA PadLock ACE, Advanced Cryptography Engine)
|
||||
|
|
|
|||
18
include/crypto/algapi.h
Normal file
18
include/crypto/algapi.h
Normal file
|
|
@ -0,0 +1,18 @@
|
|||
/*
|
||||
* Cryptographic API for algorithms (i.e., low-level API).
|
||||
*
|
||||
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the Free
|
||||
* Software Foundation; either version 2 of the License, or (at your option)
|
||||
* any later version.
|
||||
*
|
||||
*/
|
||||
#ifndef _CRYPTO_ALGAPI_H
|
||||
#define _CRYPTO_ALGAPI_H
|
||||
|
||||
#include <linux/crypto.h>
|
||||
|
||||
#endif /* _CRYPTO_ALGAPI_H */
|
||||
|
||||
Loading…
Reference in a new issue