OPENSSL_RISCVCAP(3ssl) OpenSSL OPENSSL_RISCVCAP(3ssl) NAME OPENSSL_riscvcap - the RISC-V processor capabilities vector SYNOPSIS env OPENSSL_riscvcap=... DESCRIPTION libcrypto supports RISC-V instruction set extensions. These extensions are denoted by individual extension names in the capabilities vector. For Linux platform, when libcrypto is initialized, the results returned by the RISC-V Hardware Probing syscall (hwprobe) are stored in the vector. Otherwise all capabilities are disabled. To override the set of instructions available to an application, you can set the OPENSSL_riscvcap environment variable before you start the application. The environment variable is similar to the RISC-V ISA string defined in the RISC-V Instruction Set Manual. It is case insensitive. Though due to the limit of the environment variable parser inside libcrypto, an extension must be prefixed with an underscore to make it recognizable. This also applies to the Vector extension. OPENSSL_riscvcap="rv64gc_v_zba_zbb_zbs..." Note that extension implication is currently not implemented. For example, when "rv64gc_b" is provided as the environment variable, zba/zbb/zbs would not be implied in the capability vector. Currently only these extensions are recognized: ZBA Address Generation Could be detected using hwprobe for Linux kernel >= 6.5 ZBB Basic bit-manipulation Could be detected using hwprobe for Linux kernel >= 6.5 ZBC Carry-less multiplication Could be detected using hwprobe for Linux kernel >= 6.8 ZBS Single-bit instructions Could be detected using hwprobe for Linux kernel >= 6.5 ZBKB Bit-manipulation for Cryptography Could be detected using hwprobe for Linux kernel >= 6.8 ZBKC Carry-less multiplication for Cryptography Could be detected using hwprobe for Linux kernel >= 6.8 ZBKX Crossbar permutations Could be detected using hwprobe for Linux kernel >= 6.8 ZKND NIST Suite: AES Decryption Could be detected using hwprobe for Linux kernel >= 6.8 ZKNE NIST Suite: AES Encryption Could be detected using hwprobe for Linux kernel >= 6.8 ZKNH NIST Suite: Hash Function Instructions Could be detected using hwprobe for Linux kernel >= 6.8 ZKSED ShangMi Suite: SM4 Block Cipher Instructions Could be detected using hwprobe for Linux kernel >= 6.8 ZKSH ShangMi Suite: SM3 Hash Function Instructions Could be detected using hwprobe for Linux kernel >= 6.8 ZKR Entropy Source Extension ZKT Data Independent Execution Latency Could be detected using hwprobe for Linux kernel >= 6.8 V Vector Extension for Application Processors Could be detected using hwprobe for Linux kernel >= 6.5 ZVBB Vector Basic Bit-manipulation Could be detected using hwprobe for Linux kernel >= 6.8 ZVBC Vector Carryless Multiplication Could be detected using hwprobe for Linux kernel >= 6.8 ZVKB Vector Cryptography Bit-manipulation Could be detected using hwprobe for Linux kernel >= 6.8 ZVKG Vector GCM/GMAC Could be detected using hwprobe for Linux kernel >= 6.8 ZVKNED NIST Suite: Vector AES Block Cipher Could be detected using hwprobe for Linux kernel >= 6.8 ZVKNHA NIST Suite: Vector SHA-2 Secure Hash Could be detected using hwprobe for Linux kernel >= 6.8 ZVKNHB NIST Suite: Vector SHA-2 Secure Hash Could be detected using hwprobe for Linux kernel >= 6.8 ZVKSED ShangMi Suite: SM4 Block Cipher Could be detected using hwprobe for Linux kernel >= 6.8 ZVKSH ShangMi Suite: SM3 Secure Hash Could be detected using hwprobe for Linux kernel >= 6.8 RETURN VALUES Not available. EXAMPLES Check currently detected capabilities $ openssl info -cpusettings OPENSSL_riscvcap=ZBA_ZBB_ZBC_ZBS_V Disables all instruction set extensions: OPENSSL_riscvcap="rv64gc" Only enable the vector extension: OPENSSL_riscvcap="rv64gc_v" COPYRIGHT Copyright 2024 The OpenSSL Project Authors. All Rights Reserved. Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at . 3.4.0 2024-10-23 OPENSSL_RISCVCAP(3ssl)