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aesctr_drbg.c
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hmac_drbg.c
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sysrng.c
(3.44 KB)
Editing: hmac_drbg.c
/* * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include "inner.h" /* see bearssl.h */ void br_hmac_drbg_init(br_hmac_drbg_context *ctx, const br_hash_class *digest_class, const void *seed, size_t len) { size_t hlen; ctx->vtable = &br_hmac_drbg_vtable; hlen = br_digest_size(digest_class); memset(ctx->K, 0x00, hlen); memset(ctx->V, 0x01, hlen); ctx->digest_class = digest_class; br_hmac_drbg_update(ctx, seed, len); } /* see bearssl.h */ void br_hmac_drbg_generate(br_hmac_drbg_context *ctx, void *out, size_t len) { const br_hash_class *dig; br_hmac_key_context kc; br_hmac_context hc; size_t hlen; unsigned char *buf; unsigned char x; dig = ctx->digest_class; hlen = br_digest_size(dig); br_hmac_key_init(&kc, dig, ctx->K, hlen); buf = out; while (len > 0) { size_t clen; br_hmac_init(&hc, &kc, 0); br_hmac_update(&hc, ctx->V, hlen); br_hmac_out(&hc, ctx->V); clen = hlen; if (clen > len) { clen = len; } memcpy(buf, ctx->V, clen); buf += clen; len -= clen; } /* * To prepare the state for the next request, we should call * br_hmac_drbg_update() with an empty additional seed. However, * we already have an initialized HMAC context with the right * initial key, and we don't want to push another one on the * stack, so we inline that update() call here. */ br_hmac_init(&hc, &kc, 0); br_hmac_update(&hc, ctx->V, hlen); x = 0x00; br_hmac_update(&hc, &x, 1); br_hmac_out(&hc, ctx->K); br_hmac_key_init(&kc, dig, ctx->K, hlen); br_hmac_init(&hc, &kc, 0); br_hmac_update(&hc, ctx->V, hlen); br_hmac_out(&hc, ctx->V); } /* see bearssl.h */ void br_hmac_drbg_update(br_hmac_drbg_context *ctx, const void *seed, size_t len) { const br_hash_class *dig; br_hmac_key_context kc; br_hmac_context hc; size_t hlen; unsigned char x; dig = ctx->digest_class; hlen = br_digest_size(dig); /* * 1. K = HMAC(K, V || 0x00 || seed) */ br_hmac_key_init(&kc, dig, ctx->K, hlen); br_hmac_init(&hc, &kc, 0); br_hmac_update(&hc, ctx->V, hlen); x = 0x00; br_hmac_update(&hc, &x, 1); br_hmac_update(&hc, seed, len); br_hmac_out(&hc, ctx->K); br_hmac_key_init(&kc, dig, ctx->K, hlen); /* * 2. V = HMAC(K, V) */ br_hmac_init(&hc, &kc, 0); br_hmac_update(&hc, ctx->V, hlen); br_hmac_out(&hc, ctx->V); /* * 3. If the additional seed is empty, then stop here. */ if (len == 0) { return; } /* * 4. K = HMAC(K, V || 0x01 || seed) */ br_hmac_init(&hc, &kc, 0); br_hmac_update(&hc, ctx->V, hlen); x = 0x01; br_hmac_update(&hc, &x, 1); br_hmac_update(&hc, seed, len); br_hmac_out(&hc, ctx->K); br_hmac_key_init(&kc, dig, ctx->K, hlen); /* * 5. V = HMAC(K, V) */ br_hmac_init(&hc, &kc, 0); br_hmac_update(&hc, ctx->V, hlen); br_hmac_out(&hc, ctx->V); } /* see bearssl.h */ const br_prng_class br_hmac_drbg_vtable = { sizeof(br_hmac_drbg_context), (void (*)(const br_prng_class **, const void *, const void *, size_t)) &br_hmac_drbg_init, (void (*)(const br_prng_class **, void *, size_t)) &br_hmac_drbg_generate, (void (*)(const br_prng_class **, const void *, size_t)) &br_hmac_drbg_update };
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