Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * PRNG: Pseudo Random Number Generator
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *       Based on NIST Recommended PRNG From ANSI X9.31 Appendix A.2.4 using
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *       AES 128 cipher
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *  (C) Neil Horman <nhorman@tuxdriver.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <crypto/internal/cipher.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <crypto/internal/rng.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define DEFAULT_PRNG_KEY "0123456789abcdef"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define DEFAULT_PRNG_KSZ 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define DEFAULT_BLK_SZ 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define DEFAULT_V_SEED "zaybxcwdveuftgsh"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * Flags for the prng_context flags field
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define PRNG_FIXED_SIZE 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define PRNG_NEED_RESET 0x2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  * Note: DT is our counter value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  *	 I is our intermediate value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  *	 V is our seed vector
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * See http://csrc.nist.gov/groups/STM/cavp/documents/rng/931rngext.pdf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  * for implementation details
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) struct prng_context {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	spinlock_t prng_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	unsigned char rand_data[DEFAULT_BLK_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	unsigned char last_rand_data[DEFAULT_BLK_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	unsigned char DT[DEFAULT_BLK_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	unsigned char I[DEFAULT_BLK_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	unsigned char V[DEFAULT_BLK_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	u32 rand_data_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct crypto_cipher *tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	u32 flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) static int dbg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) static void hexdump(char *note, unsigned char *buf, unsigned int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	if (dbg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		printk(KERN_CRIT "%s", note);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		print_hex_dump(KERN_CONT, "", DUMP_PREFIX_OFFSET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 				16, 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 				buf, len, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) #define dbgprint(format, args...) do {\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) if (dbg)\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	printk(format, ##args);\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) static void xor_vectors(unsigned char *in1, unsigned char *in2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 			unsigned char *out, unsigned int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	for (i = 0; i < size; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		out[i] = in1[i] ^ in2[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * Returns DEFAULT_BLK_SZ bytes of random data per call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * returns 0 if generation succeeded, <0 if something went wrong
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static int _get_more_prng_bytes(struct prng_context *ctx, int cont_test)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	unsigned char tmp[DEFAULT_BLK_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	unsigned char *output = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	dbgprint(KERN_CRIT "Calling _get_more_prng_bytes for context %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	hexdump("Input DT: ", ctx->DT, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	hexdump("Input I: ", ctx->I, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	hexdump("Input V: ", ctx->V, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	 * This algorithm is a 3 stage state machine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	for (i = 0; i < 3; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		switch (i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			 * Start by encrypting the counter value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			 * This gives us an intermediate value I
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			memcpy(tmp, ctx->DT, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 			output = ctx->I;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			hexdump("tmp stage 0: ", tmp, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		case 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			 * Next xor I with our secret vector V
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 			 * encrypt that result to obtain our
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			 * pseudo random data which we output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 			xor_vectors(ctx->I, ctx->V, tmp, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			hexdump("tmp stage 1: ", tmp, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			output = ctx->rand_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		case 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			 * First check that we didn't produce the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 			 * random data that we did last time around through this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 			if (!memcmp(ctx->rand_data, ctx->last_rand_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 					DEFAULT_BLK_SZ)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 				if (cont_test) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 					panic("cprng %p Failed repetition check!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 						ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 				}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				printk(KERN_ERR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 					"ctx %p Failed repetition check!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 					ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 				ctx->flags |= PRNG_NEED_RESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			memcpy(ctx->last_rand_data, ctx->rand_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 				DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			 * Lastly xor the random data with I
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			 * and encrypt that to obtain a new secret vector V
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 			 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			xor_vectors(ctx->rand_data, ctx->I, tmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 				DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			output = ctx->V;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 			hexdump("tmp stage 2: ", tmp, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		/* do the encryption */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		crypto_cipher_encrypt_one(ctx->tfm, output, tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	 * Now update our DT value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	for (i = DEFAULT_BLK_SZ - 1; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		ctx->DT[i] += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		if (ctx->DT[i] != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	dbgprint("Returning new block for context %p\n", ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	ctx->rand_data_valid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	hexdump("Output DT: ", ctx->DT, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	hexdump("Output I: ", ctx->I, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	hexdump("Output V: ", ctx->V, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	hexdump("New Random Data: ", ctx->rand_data, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /* Our exported functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static int get_prng_bytes(char *buf, size_t nbytes, struct prng_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 				int do_cont_test)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	unsigned char *ptr = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	unsigned int byte_count = (unsigned int)nbytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	spin_lock_bh(&ctx->prng_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (ctx->flags & PRNG_NEED_RESET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	 * If the FIXED_SIZE flag is on, only return whole blocks of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	 * pseudo random data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (ctx->flags & PRNG_FIXED_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		if (nbytes < DEFAULT_BLK_SZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		byte_count = DEFAULT_BLK_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 * Return 0 in case of success as mandated by the kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	 * crypto API interface definition.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	dbgprint(KERN_CRIT "getting %d random bytes for context %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		byte_count, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) remainder:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (ctx->rand_data_valid == DEFAULT_BLK_SZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		if (_get_more_prng_bytes(ctx, do_cont_test) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 			memset(buf, 0, nbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 			err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	 * Copy any data less than an entire block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (byte_count < DEFAULT_BLK_SZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) empty_rbuf:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		while (ctx->rand_data_valid < DEFAULT_BLK_SZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 			*ptr = ctx->rand_data[ctx->rand_data_valid];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			ptr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			byte_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			ctx->rand_data_valid++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			if (byte_count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 				goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	 * Now copy whole blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	for (; byte_count >= DEFAULT_BLK_SZ; byte_count -= DEFAULT_BLK_SZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		if (ctx->rand_data_valid == DEFAULT_BLK_SZ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			if (_get_more_prng_bytes(ctx, do_cont_test) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 				memset(buf, 0, nbytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 				err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 				goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		if (ctx->rand_data_valid > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			goto empty_rbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		memcpy(ptr, ctx->rand_data, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		ctx->rand_data_valid += DEFAULT_BLK_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		ptr += DEFAULT_BLK_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	 * Now go back and get any remaining partial block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (byte_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		goto remainder;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	spin_unlock_bh(&ctx->prng_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	dbgprint(KERN_CRIT "returning %d from get_prng_bytes in context %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		err, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static void free_prng_context(struct prng_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	crypto_free_cipher(ctx->tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static int reset_prng_context(struct prng_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			      const unsigned char *key, size_t klen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 			      const unsigned char *V, const unsigned char *DT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	const unsigned char *prng_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	spin_lock_bh(&ctx->prng_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	ctx->flags |= PRNG_NEED_RESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	prng_key = (key != NULL) ? key : (unsigned char *)DEFAULT_PRNG_KEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	if (!key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		klen = DEFAULT_PRNG_KSZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (V)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		memcpy(ctx->V, V, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		memcpy(ctx->V, DEFAULT_V_SEED, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	if (DT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		memcpy(ctx->DT, DT, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		memset(ctx->DT, 0, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	memset(ctx->rand_data, 0, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	memset(ctx->last_rand_data, 0, DEFAULT_BLK_SZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	ctx->rand_data_valid = DEFAULT_BLK_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	ret = crypto_cipher_setkey(ctx->tfm, prng_key, klen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		dbgprint(KERN_CRIT "PRNG: setkey() failed flags=%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 			crypto_cipher_get_flags(ctx->tfm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	ctx->flags &= ~PRNG_NEED_RESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	spin_unlock_bh(&ctx->prng_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) static int cprng_init(struct crypto_tfm *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	struct prng_context *ctx = crypto_tfm_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	spin_lock_init(&ctx->prng_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	ctx->tfm = crypto_alloc_cipher("aes", 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if (IS_ERR(ctx->tfm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		dbgprint(KERN_CRIT "Failed to alloc tfm for context %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 				ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		return PTR_ERR(ctx->tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (reset_prng_context(ctx, NULL, DEFAULT_PRNG_KSZ, NULL, NULL) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	 * after allocation, we should always force the user to reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	 * so they don't inadvertently use the insecure default values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	 * without specifying them intentially
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	ctx->flags |= PRNG_NEED_RESET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static void cprng_exit(struct crypto_tfm *tfm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	free_prng_context(crypto_tfm_ctx(tfm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) static int cprng_get_random(struct crypto_rng *tfm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			    const u8 *src, unsigned int slen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			    u8 *rdata, unsigned int dlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	struct prng_context *prng = crypto_rng_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	return get_prng_bytes(rdata, dlen, prng, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)  *  This is the cprng_registered reset method the seed value is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)  *  interpreted as the tuple { V KEY DT}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)  *  V and KEY are required during reset, and DT is optional, detected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)  *  as being present by testing the length of the seed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) static int cprng_reset(struct crypto_rng *tfm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		       const u8 *seed, unsigned int slen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	struct prng_context *prng = crypto_rng_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	const u8 *key = seed + DEFAULT_BLK_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	const u8 *dt = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	if (slen < DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	if (slen >= (2 * DEFAULT_BLK_SZ + DEFAULT_PRNG_KSZ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 		dt = key + DEFAULT_PRNG_KSZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	reset_prng_context(prng, key, DEFAULT_PRNG_KSZ, seed, dt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	if (prng->flags & PRNG_NEED_RESET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) #ifdef CONFIG_CRYPTO_FIPS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) static int fips_cprng_get_random(struct crypto_rng *tfm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 				 const u8 *src, unsigned int slen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 				 u8 *rdata, unsigned int dlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	struct prng_context *prng = crypto_rng_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	return get_prng_bytes(rdata, dlen, prng, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) static int fips_cprng_reset(struct crypto_rng *tfm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 			    const u8 *seed, unsigned int slen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	u8 rdata[DEFAULT_BLK_SZ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	const u8 *key = seed + DEFAULT_BLK_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	struct prng_context *prng = crypto_rng_ctx(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	if (slen < DEFAULT_PRNG_KSZ + DEFAULT_BLK_SZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	/* fips strictly requires seed != key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	if (!memcmp(seed, key, DEFAULT_PRNG_KSZ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	rc = cprng_reset(tfm, seed, slen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	/* this primes our continuity test */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	rc = get_prng_bytes(rdata, DEFAULT_BLK_SZ, prng, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	prng->rand_data_valid = DEFAULT_BLK_SZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) static struct rng_alg rng_algs[] = { {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	.generate		= cprng_get_random,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	.seed			= cprng_reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	.seedsize		= DEFAULT_PRNG_KSZ + 2 * DEFAULT_BLK_SZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	.base			=	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 		.cra_name		= "stdrng",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		.cra_driver_name	= "ansi_cprng",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 		.cra_priority		= 100,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 		.cra_ctxsize		= sizeof(struct prng_context),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 		.cra_module		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 		.cra_init		= cprng_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 		.cra_exit		= cprng_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) #ifdef CONFIG_CRYPTO_FIPS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) }, {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 	.generate		= fips_cprng_get_random,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	.seed			= fips_cprng_reset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	.seedsize		= DEFAULT_PRNG_KSZ + 2 * DEFAULT_BLK_SZ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	.base			=	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 		.cra_name		= "fips(ansi_cprng)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 		.cra_driver_name	= "fips_ansi_cprng",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		.cra_priority		= 300,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 		.cra_ctxsize		= sizeof(struct prng_context),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 		.cra_module		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 		.cra_init		= cprng_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 		.cra_exit		= cprng_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) } };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) /* Module initalization */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) static int __init prng_mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	return crypto_register_rngs(rng_algs, ARRAY_SIZE(rng_algs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) static void __exit prng_mod_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	crypto_unregister_rngs(rng_algs, ARRAY_SIZE(rng_algs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) MODULE_DESCRIPTION("Software Pseudo Random Number Generator");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) module_param(dbg, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) MODULE_PARM_DESC(dbg, "Boolean to enable debugging (0/1 == off/on)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) subsys_initcall(prng_mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) module_exit(prng_mod_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) MODULE_ALIAS_CRYPTO("stdrng");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) MODULE_ALIAS_CRYPTO("ansi_cprng");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) MODULE_IMPORT_NS(CRYPTO_INTERNAL);