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envelope-from=freude@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add a first document covering the Qemu s390 CPACF instructions and functions supported. Signed-off-by: Harald Freudenberger Reviewed-by: Finn Callies Reviewed-by: Ilya Leoshkevich --- docs/system/s390x/cpacf.rst | 143 +++++++++++++++++++++++++++++++++++ docs/system/target-s390x.rst | 1 + 2 files changed, 144 insertions(+) create mode 100644 docs/system/s390x/cpacf.rst diff --git a/docs/system/s390x/cpacf.rst b/docs/system/s390x/cpacf.rst new file mode 100644 index 0000000000..c68aa74abe --- /dev/null +++ b/docs/system/s390x/cpacf.rst @@ -0,0 +1,143 @@ +.. SPDX-License-Identifier: GPL-2.0-or-later + +CPACF Support +============= + +CPACF +----- + +CP Assist for Cryptographic Function (CPACF) is a hardware-integrated +coprocessor feature built into every processor core of IBM Z and +LinuxONE mainframes (s390x architecture). It provides high-speed, +hardware-accelerated encryption and hashing directly on the CPU. + +CPACF provides a set of z/Architecture instructions (known as Message +Security Assist or MSA) that execute cryptographic operations +synchronously with the main processor. + +- Symmetric Encryption: Support for AES (128, 192, 256-bit), DES, and + Triple-DES (TDES). +- Hashing: Acceleration for SHA-1, SHA-2 (up to SHA-512), SHA-3 and + SHAKE. +- Random Number Generation: Pseudo Random Number Generator (PRNG) and + a hardware-based True Random Number Generator (TRNG). +- Asymmetric Support: Elliptic Curve Cryptography (ECC) primitives + P-256, P-384, P-521, Montgomery/Edwards curves (e.g., Ed25519). + +Documentation about CPACF instructions is publicly available and +can be found in the "z/Architecture Principles of Operation" +accessible at the IBM documentation hub https://www.ibm.com/docs/en. +For example the latest version as a pdf is available here: +https://www.ibm.com/support/pages/zvm/library/other/22783214.pdf + + +CPACF instructions +------------------ + +Here is a list of implemented CPACF instructions and the supported +functions for each instruction: + +KDSA (COMPUTE DIGITAL SIGNATURE AUTHENTICATION) +- Function code 0x00 - Function Query + +KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) +- Function code 0x00 - Function Query +- Function code 0x02 - CPACF_KIMD_SHA_256 +- Function code 0x03 - CPACF_KIMD_SHA_512 + +KLMD (COMPUTE LAST MESSAGE DIGEST) +- Function code 0x00 - Function Query +- Function code 0x02 - CPACF_KLMD_SHA_256 +- Function code 0x03 - CPACF_KLMD_SHA_512 + +KM (CIPHER MESSAGE) +- Function code 0x00 - Function Query +- Function code 0x12 - CPACF_KM_AES_128 +- Function code 0x13 - CPACF_KM_AES_192 +- Function code 0x14 - CPACF_KM_AES_256 +- Function code 0x1a - CPACF_KM_PAES_128 +- Function code 0x1b - CPACF_KM_PAES_192 +- Function code 0x1c - CPACF_KM_PAES_256 +- Function code 0x32 - CPACF_KM_XTS_128 +- Function code 0x34 - CPACF_KM_XTS_256 +- Function code 0x3a - CPACF_KM_PXTS_128 +- Function code 0x3c - CPACF_KM_PXTS_256 + +KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) +- Function code 0x00 - Function Query + +KMC (CIPHER MESSAGE WITH CHAINING) +- Function code 0x00 - Function Query +- Function code 0x12 - CPACF_KMC_AES_128 +- Function code 0x13 - CPACF_KMC_AES_192 +- Function code 0x14 - CPACF_KMC_AES_256 +- Function code 0x1a - CPACF_KMC_PAES_128 +- Function code 0x1b - CPACF_KMC_PAES_192 +- Function code 0x1c - CPACF_KMC_PAES_256 + +KMCTR (CIPHER MESSAGE WITH COUNTER) +- Function code 0x00 - Function Query +- Function code 0x12 - CPACF_KMCTR_AES_128 +- Function code 0x13 - CPACF_KMCTR_AES_192 +- Function code 0x14 - CPACF_KMCTR_AES_256 +- Function code 0x1a - CPACF_KMCTR_PAES_128 +- Function code 0x1b - CPACF_KMCTR_PAES_192 +- Function code 0x1c - CPACF_KMCTR_PAES_256 + +KMF (CIPHER MESSAGE WITH CIPHER FEEDBACK) +- not supported + +KMO (CIPHER MESSAGE WITH OUTPUT FEEDBACK) +- not supported + +PCC (PERFORM CRYPTOGRAPHIC COMPUTATION) +- Function code 0x00 - Function Query +- Function code 0x32 - compute XTS param AES-128 +- Function code 0x34 - compute XTS param AES-256 +- Function code 0x3a - compute XTS param Encrypted AES-128 +- Function code 0x3c - compute XTS param Encrypted AES-256 + +PCKMO (PERFORM CRYPTOGRAPHIC KEY MANAGEMENT OPERATION) +- Function code 0x00 - Function Query +- Function code 0x12 - CPACF_PCKMO_ENC_AES_128_KEY +- Function code 0x13 - CPACF_PCKMO_ENC_AES_192_KEY +- Function code 0x14 - CPACF_PCKMO_ENC_AES_256_KEY + +PRNO (PERFORM RANDOM NUMBER OPERATION) +- Function code 0x00 - Function Query +- Function code 0x72 - CPACF_PRNO_TRNG + +Not listed CPACF instructions (KMA) cause an Operation Exception when +used. Instructions with only query function support (KMF, KMO, KDSA) +perform register validation and raise a Specification Exception for +invalid registers or non-query function codes. The query function for +these instructions will return a function status word with all but the +query function bit set to 0. + + +Protected key support +--------------------- + +The qemu version for protected key support is only a fake provided +here for developing and testing purpose: + +- The protected key is _derived_ from the clear key by xoring the + fixed pattern 0xAAAA... onto the key value. +- The AES Wrapping Key Verification Pattern is a fixed value of 32 + bytes 0x0F0A0C0E0F0A0C0E... + +The PCKMO instruction implementation does exactly this - _derive_ a +_protected_ key from the clear key given by xor 0xAAAA... and writing +the fixed value for the WKVP of 0x0F0A0C0E0F0A0C0E... into the blob. +The other subfunctions of the CPACF instructions dealing with +protected key treat the protected key blob by first checking for the +WKVP (against the fixed value of 0x0F0A0C0E0F0A0C0E...) and second +_decrypting_ the key value by xoring 0xAAAA... and then execute the +clear key operation with the decrypted key value. +This is suitable for testing purpose but such keys are not for real +production load and would open up a huge security breach! + +For more details about protected keys see the "z/Architecture +Principles of Operation" document chapter "General Instructions" +sub-chapter "Protection of Cryptographic Keys" and again the +implementation here does NOT implement what is explained there. diff --git a/docs/system/target-s390x.rst b/docs/system/target-s390x.rst index 94c981e732..49159826eb 100644 --- a/docs/system/target-s390x.rst +++ b/docs/system/target-s390x.rst @@ -35,3 +35,4 @@ Architectural features s390x/bootdevices s390x/protvirt s390x/cpu-topology + s390x/cpacf -- 2.43.0