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secp256k1
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Support cloning a context into preallocated memory

This commit is contained in:
Tim Ruffing 2018-10-25 17:14:10 +02:00
parent c4fd5dab45
commit 5feadde462
1 changed files with 21 additions and 10 deletions
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31
src/secp256k1.c
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@ -82,6 +82,17 @@ size_t secp256k1_context_preallocated_size(unsigned int flags) {
return ret;
}
size_t secp256k1_context_preallocated_clone_size(const secp256k1_context* ctx) {
size_t ret = ROUND_TO_ALIGN(sizeof(secp256k1_context));
if (secp256k1_ecmult_gen_context_is_built(&ctx->ecmult_gen_ctx)) {
ret += SECP256K1_ECMULT_GEN_CONTEXT_PREALLOCATED_SIZE;
}
if (secp256k1_ecmult_context_is_built(&ctx->ecmult_ctx)) {
ret += SECP256K1_ECMULT_CONTEXT_PREALLOCATED_SIZE;
}
return ret;
}
secp256k1_context* secp256k1_context_preallocated_create(void* prealloc, unsigned int flags) {
void* const base = prealloc;
size_t prealloc_size = secp256k1_context_preallocated_size(flags);
@ -120,22 +131,22 @@ secp256k1_context* secp256k1_context_create(unsigned int flags) {
return ctx;
}
secp256k1_context* secp256k1_context_clone(const secp256k1_context* ctx) {
secp256k1_context* ret;
size_t prealloc_size = ROUND_TO_ALIGN(sizeof(secp256k1_context));
if (secp256k1_ecmult_gen_context_is_built(&ctx->ecmult_gen_ctx)) {
prealloc_size += SECP256K1_ECMULT_GEN_CONTEXT_PREALLOCATED_SIZE;
}
if (secp256k1_ecmult_context_is_built(&ctx->ecmult_ctx)) {
prealloc_size += SECP256K1_ECMULT_CONTEXT_PREALLOCATED_SIZE;
}
ret = checked_malloc(&ctx->error_callback, prealloc_size);
secp256k1_context* secp256k1_context_preallocated_clone(const secp256k1_context* ctx, void* prealloc) {
size_t prealloc_size = secp256k1_context_preallocated_clone_size(ctx);
secp256k1_context* ret = (secp256k1_context*)prealloc;
memcpy(ret, ctx, prealloc_size);
secp256k1_ecmult_gen_context_finalize_memcpy(&ret->ecmult_gen_ctx, &ctx->ecmult_gen_ctx);
secp256k1_ecmult_context_finalize_memcpy(&ret->ecmult_ctx, &ctx->ecmult_ctx);
return ret;
}
secp256k1_context* secp256k1_context_clone(const secp256k1_context* ctx) {
size_t prealloc_size = secp256k1_context_preallocated_clone_size(ctx);
secp256k1_context* ret = (secp256k1_context*)checked_malloc(&ctx->error_callback, prealloc_size);
ret = secp256k1_context_preallocated_clone(ctx, ret);
return ret;
}
void secp256k1_context_preallocated_destroy(secp256k1_context* ctx) {
CHECK(ctx != secp256k1_context_no_precomp);
if (ctx != NULL) {