375 lines
11 KiB
C
375 lines
11 KiB
C
/*
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* Cryptographic API.
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*
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* Support for z990 cryptographic instructions.
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*
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* Copyright (C) 2003 IBM Deutschland GmbH, IBM Corporation
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* Author(s): Thomas Spatzier (tspat@de.ibm.com)
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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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#ifndef _CRYPTO_ARCH_S390_CRYPT_Z990_H
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#define _CRYPTO_ARCH_S390_CRYPT_Z990_H
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#include <asm/errno.h>
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#define CRYPT_Z990_OP_MASK 0xFF00
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#define CRYPT_Z990_FUNC_MASK 0x00FF
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/*z990 cryptographic operations*/
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enum crypt_z990_operations {
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CRYPT_Z990_KM = 0x0100,
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CRYPT_Z990_KMC = 0x0200,
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CRYPT_Z990_KIMD = 0x0300,
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CRYPT_Z990_KLMD = 0x0400,
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CRYPT_Z990_KMAC = 0x0500
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};
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/*function codes for KM (CIPHER MESSAGE) instruction*/
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enum crypt_z990_km_func {
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KM_QUERY = CRYPT_Z990_KM | 0,
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KM_DEA_ENCRYPT = CRYPT_Z990_KM | 1,
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KM_DEA_DECRYPT = CRYPT_Z990_KM | 1 | 0x80, //modifier bit->decipher
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KM_TDEA_128_ENCRYPT = CRYPT_Z990_KM | 2,
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KM_TDEA_128_DECRYPT = CRYPT_Z990_KM | 2 | 0x80,
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KM_TDEA_192_ENCRYPT = CRYPT_Z990_KM | 3,
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KM_TDEA_192_DECRYPT = CRYPT_Z990_KM | 3 | 0x80,
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};
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/*function codes for KMC (CIPHER MESSAGE WITH CHAINING) instruction*/
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enum crypt_z990_kmc_func {
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KMC_QUERY = CRYPT_Z990_KMC | 0,
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KMC_DEA_ENCRYPT = CRYPT_Z990_KMC | 1,
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KMC_DEA_DECRYPT = CRYPT_Z990_KMC | 1 | 0x80, //modifier bit->decipher
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KMC_TDEA_128_ENCRYPT = CRYPT_Z990_KMC | 2,
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KMC_TDEA_128_DECRYPT = CRYPT_Z990_KMC | 2 | 0x80,
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KMC_TDEA_192_ENCRYPT = CRYPT_Z990_KMC | 3,
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KMC_TDEA_192_DECRYPT = CRYPT_Z990_KMC | 3 | 0x80,
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};
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/*function codes for KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) instruction*/
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enum crypt_z990_kimd_func {
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KIMD_QUERY = CRYPT_Z990_KIMD | 0,
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KIMD_SHA_1 = CRYPT_Z990_KIMD | 1,
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};
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/*function codes for KLMD (COMPUTE LAST MESSAGE DIGEST) instruction*/
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enum crypt_z990_klmd_func {
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KLMD_QUERY = CRYPT_Z990_KLMD | 0,
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KLMD_SHA_1 = CRYPT_Z990_KLMD | 1,
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};
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/*function codes for KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) instruction*/
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enum crypt_z990_kmac_func {
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KMAC_QUERY = CRYPT_Z990_KMAC | 0,
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KMAC_DEA = CRYPT_Z990_KMAC | 1,
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KMAC_TDEA_128 = CRYPT_Z990_KMAC | 2,
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KMAC_TDEA_192 = CRYPT_Z990_KMAC | 3
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};
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/*status word for z990 crypto instructions' QUERY functions*/
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struct crypt_z990_query_status {
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u64 high;
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u64 low;
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};
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/*
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* Standard fixup and ex_table sections for crypt_z990 inline functions.
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* label 0: the z990 crypto operation
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* label 1: just after 1 to catch illegal operation exception on non-z990
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* label 6: the return point after fixup
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* label 7: set error value if exception _in_ crypto operation
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* label 8: set error value if illegal operation exception
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* [ret] is the variable to receive the error code
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* [ERR] is the error code value
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*/
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#ifndef __s390x__
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#define __crypt_z990_fixup \
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".section .fixup,\"ax\" \n" \
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"7: lhi %0,%h[e1] \n" \
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" bras 1,9f \n" \
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" .long 6b \n" \
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"8: lhi %0,%h[e2] \n" \
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" bras 1,9f \n" \
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" .long 6b \n" \
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"9: l 1,0(1) \n" \
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" br 1 \n" \
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".previous \n" \
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".section __ex_table,\"a\" \n" \
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" .align 4 \n" \
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" .long 0b,7b \n" \
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" .long 1b,8b \n" \
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".previous"
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#else /* __s390x__ */
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#define __crypt_z990_fixup \
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".section .fixup,\"ax\" \n" \
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"7: lhi %0,%h[e1] \n" \
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" jg 6b \n" \
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"8: lhi %0,%h[e2] \n" \
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" jg 6b \n" \
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".previous\n" \
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".section __ex_table,\"a\" \n" \
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" .align 8 \n" \
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" .quad 0b,7b \n" \
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" .quad 1b,8b \n" \
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".previous"
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#endif /* __s390x__ */
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/*
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* Standard code for setting the result of z990 crypto instructions.
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* %0: the register which will receive the result
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* [result]: the register containing the result (e.g. second operand length
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* to compute number of processed bytes].
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*/
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#ifndef __s390x__
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#define __crypt_z990_set_result \
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" lr %0,%[result] \n"
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#else /* __s390x__ */
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#define __crypt_z990_set_result \
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" lgr %0,%[result] \n"
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#endif
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/*
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* Executes the KM (CIPHER MESSAGE) operation of the z990 CPU.
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* @param func: the function code passed to KM; see crypt_z990_km_func
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* @param param: address of parameter block; see POP for details on each func
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* @param dest: address of destination memory area
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* @param src: address of source memory area
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* @param src_len: length of src operand in bytes
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* @returns < zero for failure, 0 for the query func, number of processed bytes
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* for encryption/decryption funcs
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*/
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static inline int
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crypt_z990_km(long func, void* param, u8* dest, const u8* src, long src_len)
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{
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register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
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register void* __param asm("1") = param;
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register u8* __dest asm("4") = dest;
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register const u8* __src asm("2") = src;
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register long __src_len asm("3") = src_len;
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int ret;
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ret = 0;
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__asm__ __volatile__ (
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"0: .insn rre,0xB92E0000,%1,%2 \n" //KM opcode
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"1: brc 1,0b \n" //handle partial completion
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__crypt_z990_set_result
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"6: \n"
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__crypt_z990_fixup
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: "+d" (ret), "+a" (__dest), "+a" (__src),
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[result] "+d" (__src_len)
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: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
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"a" (__param)
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: "cc", "memory"
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);
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if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
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ret = src_len - ret;
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}
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return ret;
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}
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/*
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* Executes the KMC (CIPHER MESSAGE WITH CHAINING) operation of the z990 CPU.
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* @param func: the function code passed to KM; see crypt_z990_kmc_func
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* @param param: address of parameter block; see POP for details on each func
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* @param dest: address of destination memory area
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* @param src: address of source memory area
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* @param src_len: length of src operand in bytes
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* @returns < zero for failure, 0 for the query func, number of processed bytes
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* for encryption/decryption funcs
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*/
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static inline int
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crypt_z990_kmc(long func, void* param, u8* dest, const u8* src, long src_len)
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{
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register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
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register void* __param asm("1") = param;
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register u8* __dest asm("4") = dest;
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register const u8* __src asm("2") = src;
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register long __src_len asm("3") = src_len;
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int ret;
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ret = 0;
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__asm__ __volatile__ (
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"0: .insn rre,0xB92F0000,%1,%2 \n" //KMC opcode
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"1: brc 1,0b \n" //handle partial completion
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__crypt_z990_set_result
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"6: \n"
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__crypt_z990_fixup
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: "+d" (ret), "+a" (__dest), "+a" (__src),
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[result] "+d" (__src_len)
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: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
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"a" (__param)
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: "cc", "memory"
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);
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if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
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ret = src_len - ret;
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}
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return ret;
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}
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/*
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* Executes the KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) operation
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* of the z990 CPU.
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* @param func: the function code passed to KM; see crypt_z990_kimd_func
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* @param param: address of parameter block; see POP for details on each func
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* @param src: address of source memory area
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* @param src_len: length of src operand in bytes
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* @returns < zero for failure, 0 for the query func, number of processed bytes
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* for digest funcs
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*/
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static inline int
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crypt_z990_kimd(long func, void* param, const u8* src, long src_len)
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{
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register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
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register void* __param asm("1") = param;
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register const u8* __src asm("2") = src;
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register long __src_len asm("3") = src_len;
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int ret;
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ret = 0;
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__asm__ __volatile__ (
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"0: .insn rre,0xB93E0000,%1,%1 \n" //KIMD opcode
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"1: brc 1,0b \n" /*handle partical completion of kimd*/
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__crypt_z990_set_result
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"6: \n"
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__crypt_z990_fixup
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: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
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: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
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"a" (__param)
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: "cc", "memory"
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);
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if (ret >= 0 && (func & CRYPT_Z990_FUNC_MASK)){
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ret = src_len - ret;
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}
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return ret;
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}
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/*
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* Executes the KLMD (COMPUTE LAST MESSAGE DIGEST) operation of the z990 CPU.
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* @param func: the function code passed to KM; see crypt_z990_klmd_func
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* @param param: address of parameter block; see POP for details on each func
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* @param src: address of source memory area
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* @param src_len: length of src operand in bytes
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* @returns < zero for failure, 0 for the query func, number of processed bytes
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* for digest funcs
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*/
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static inline int
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crypt_z990_klmd(long func, void* param, const u8* src, long src_len)
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{
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register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
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register void* __param asm("1") = param;
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register const u8* __src asm("2") = src;
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register long __src_len asm("3") = src_len;
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int ret;
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ret = 0;
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__asm__ __volatile__ (
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"0: .insn rre,0xB93F0000,%1,%1 \n" //KLMD opcode
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"1: brc 1,0b \n" /*handle partical completion of klmd*/
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__crypt_z990_set_result
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"6: \n"
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__crypt_z990_fixup
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: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
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: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
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"a" (__param)
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: "cc", "memory"
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);
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if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
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ret = src_len - ret;
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}
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return ret;
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}
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/*
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* Executes the KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) operation
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* of the z990 CPU.
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* @param func: the function code passed to KM; see crypt_z990_klmd_func
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* @param param: address of parameter block; see POP for details on each func
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* @param src: address of source memory area
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* @param src_len: length of src operand in bytes
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* @returns < zero for failure, 0 for the query func, number of processed bytes
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* for digest funcs
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*/
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static inline int
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crypt_z990_kmac(long func, void* param, const u8* src, long src_len)
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{
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register long __func asm("0") = func & CRYPT_Z990_FUNC_MASK;
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register void* __param asm("1") = param;
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register const u8* __src asm("2") = src;
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register long __src_len asm("3") = src_len;
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int ret;
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ret = 0;
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__asm__ __volatile__ (
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"0: .insn rre,0xB91E0000,%5,%5 \n" //KMAC opcode
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"1: brc 1,0b \n" /*handle partical completion of klmd*/
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__crypt_z990_set_result
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"6: \n"
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__crypt_z990_fixup
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: "+d" (ret), "+a" (__src), [result] "+d" (__src_len)
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: [e1] "K" (-EFAULT), [e2] "K" (-ENOSYS), "d" (__func),
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"a" (__param)
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: "cc", "memory"
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);
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if (ret >= 0 && func & CRYPT_Z990_FUNC_MASK){
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ret = src_len - ret;
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}
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return ret;
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}
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/**
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* Tests if a specific z990 crypto function is implemented on the machine.
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* @param func: the function code of the specific function; 0 if op in general
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* @return 1 if func available; 0 if func or op in general not available
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*/
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static inline int
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crypt_z990_func_available(int func)
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{
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int ret;
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struct crypt_z990_query_status status = {
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.high = 0,
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.low = 0
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};
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switch (func & CRYPT_Z990_OP_MASK){
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case CRYPT_Z990_KM:
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ret = crypt_z990_km(KM_QUERY, &status, NULL, NULL, 0);
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break;
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case CRYPT_Z990_KMC:
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ret = crypt_z990_kmc(KMC_QUERY, &status, NULL, NULL, 0);
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break;
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case CRYPT_Z990_KIMD:
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ret = crypt_z990_kimd(KIMD_QUERY, &status, NULL, 0);
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break;
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case CRYPT_Z990_KLMD:
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ret = crypt_z990_klmd(KLMD_QUERY, &status, NULL, 0);
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break;
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case CRYPT_Z990_KMAC:
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ret = crypt_z990_kmac(KMAC_QUERY, &status, NULL, 0);
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break;
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default:
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ret = 0;
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return ret;
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}
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if (ret >= 0){
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func &= CRYPT_Z990_FUNC_MASK;
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func &= 0x7f; //mask modifier bit
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if (func < 64){
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ret = (status.high >> (64 - func - 1)) & 0x1;
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} else {
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ret = (status.low >> (128 - func - 1)) & 0x1;
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}
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} else {
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ret = 0;
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}
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return ret;
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}
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#endif // _CRYPTO_ARCH_S390_CRYPT_Z990_H
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