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Fix #13 - add Keypair API and re-derive public keys, raise an error i…
…f the privkey and pubkey are not associated
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| // -*- mode: c; tab-width: 4; indent-tabs-mode: nil; st-rulers: [132] -*- | ||
| // vim: ts=4 sw=4 ft=c et | ||
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| #include "ed25519.h" | ||
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| /* Function Definitions */ | ||
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| /* libdecaf_nif:ed25519_derive_keypair/1 */ | ||
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| ERL_NIF_TERM | ||
| libdecaf_nif_ed25519_derive_keypair_1(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) | ||
| { | ||
| ERL_NIF_TERM out_term; | ||
| ErlNifBinary privkey; | ||
| libdecaf_nif_ed25519_keypair_t *keypair = NULL; | ||
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| if (argc != 1) { | ||
| return EXCP_BADARG(env, "argc must be 1"); | ||
| } | ||
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| if (!enif_inspect_binary(env, argv[0], &privkey) || privkey.size != DECAF_EDDSA_25519_PRIVATE_BYTES) { | ||
| return EXCP_BADARG_F(env, "Privkey must be a binary of size %d-bytes", DECAF_EDDSA_25519_PRIVATE_BYTES); | ||
| } | ||
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| keypair = (libdecaf_nif_ed25519_keypair_t *)(enif_alloc_resource(libdecaf_nif_ed25519_keypair_resource_type, sizeof(libdecaf_nif_ed25519_keypair_t))); | ||
| if (keypair == NULL) { | ||
| return EXCP_ERROR(env, "Failed to allocate libdecaf_nif_ed25519_keypair_t"); | ||
| } | ||
| (void)decaf_ed25519_derive_keypair(keypair->inner, privkey.data); | ||
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| out_term = enif_make_resource(env, (void *)keypair); | ||
| (void)enif_release_resource((void *)keypair); | ||
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| return out_term; | ||
| } | ||
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| /* libdecaf_nif:ed25519_keypair_extract_private_key/1 */ | ||
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| ERL_NIF_TERM | ||
| libdecaf_nif_ed25519_keypair_extract_private_key_1(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) | ||
| { | ||
| libdecaf_nif_ed25519_keypair_t *keypair = NULL; | ||
| ERL_NIF_TERM out; | ||
| uint8_t *privkey = NULL; | ||
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| if (argc != 1) { | ||
| return EXCP_BADARG(env, "argc must be 1"); | ||
| } | ||
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| if (!enif_get_resource(env, argv[0], libdecaf_nif_ed25519_keypair_resource_type, (void **)(&keypair))) { | ||
| return EXCP_BADARG(env, "Keypair reference is invalid"); | ||
| } | ||
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| privkey = (uint8_t *)(enif_make_new_binary(env, DECAF_EDDSA_25519_PRIVATE_BYTES, &out)); | ||
| (void)decaf_ed25519_keypair_extract_private_key(privkey, keypair->inner); | ||
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| return out; | ||
| } | ||
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| /* libdecaf_nif:ed25519_keypair_extract_public_key/1 */ | ||
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| ERL_NIF_TERM | ||
| libdecaf_nif_ed25519_keypair_extract_public_key_1(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) | ||
| { | ||
| libdecaf_nif_ed25519_keypair_t *keypair = NULL; | ||
| ERL_NIF_TERM out; | ||
| uint8_t *pubkey = NULL; | ||
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| if (argc != 1) { | ||
| return EXCP_BADARG(env, "argc must be 1"); | ||
| } | ||
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| if (!enif_get_resource(env, argv[0], libdecaf_nif_ed25519_keypair_resource_type, (void **)(&keypair))) { | ||
| return EXCP_BADARG(env, "Keypair reference is invalid"); | ||
| } | ||
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| pubkey = (uint8_t *)(enif_make_new_binary(env, DECAF_EDDSA_25519_PUBLIC_BYTES, &out)); | ||
| (void)decaf_ed25519_keypair_extract_public_key(pubkey, keypair->inner); | ||
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| return out; | ||
| } | ||
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| /* libdecaf_nif:ed25519_keypair_sign/4 */ | ||
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| ERL_NIF_TERM | ||
| libdecaf_nif_ed25519_keypair_sign_4(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) | ||
| { | ||
| libdecaf_nif_ed25519_keypair_t *keypair = NULL; | ||
| ErlNifBinary message; | ||
| unsigned int prehashed; | ||
| ErlNifBinary context; | ||
| ERL_NIF_TERM out; | ||
| uint8_t *signature = NULL; | ||
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| if (argc != 4) { | ||
| return EXCP_BADARG(env, "argc must be 4"); | ||
| } | ||
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| if (!enif_get_resource(env, argv[0], libdecaf_nif_ed25519_keypair_resource_type, (void **)(&keypair))) { | ||
| return EXCP_BADARG(env, "Keypair reference is invalid"); | ||
| } | ||
| if (!enif_inspect_binary(env, argv[1], &message)) { | ||
| return EXCP_BADARG(env, "Message must be a binary"); | ||
| } | ||
| if (!enif_get_uint(env, argv[2], &prehashed) || (prehashed != 0 && prehashed != 1)) { | ||
| return EXCP_BADARG(env, "Prehashed must be one of {0,1}"); | ||
| } | ||
| if (enif_compare(ATOM(no_context), argv[3]) == 0) { | ||
| context.size = 0; | ||
| context.data = (unsigned char *)(DECAF_ED25519_NO_CONTEXT); | ||
| } else if (!enif_inspect_binary(env, argv[3], &context) || context.size > 255) { | ||
| return EXCP_BADARG(env, "Context must be either the atom 'no_context' or a binary of size <= 255-bytes"); | ||
| } | ||
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| signature = (uint8_t *)(enif_make_new_binary(env, DECAF_EDDSA_25519_SIGNATURE_BYTES, &out)); | ||
| (void)decaf_ed25519_keypair_sign(signature, keypair->inner, message.data, message.size, prehashed, context.data, context.size); | ||
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| return out; | ||
| } | ||
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| /* libdecaf_nif:ed25519_keypair_sign_prehash/3 */ | ||
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| ERL_NIF_TERM | ||
| libdecaf_nif_ed25519_keypair_sign_prehash_3(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) | ||
| { | ||
| libdecaf_nif_ed25519_keypair_t *keypair = NULL; | ||
| ErlNifBinary message; | ||
| ErlNifBinary context; | ||
| decaf_ed25519_prehash_ctx_t hash; | ||
| ERL_NIF_TERM out; | ||
| uint8_t *signature = NULL; | ||
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| if (argc != 3) { | ||
| return EXCP_BADARG(env, "argc must be 3"); | ||
| } | ||
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| if (!enif_get_resource(env, argv[0], libdecaf_nif_ed25519_keypair_resource_type, (void **)(&keypair))) { | ||
| return EXCP_BADARG(env, "Keypair reference is invalid"); | ||
| } | ||
| if (!enif_inspect_binary(env, argv[1], &message)) { | ||
| return EXCP_BADARG(env, "Message must be a binary"); | ||
| } | ||
| if (enif_compare(ATOM(no_context), argv[2]) == 0) { | ||
| context.size = 0; | ||
| context.data = (unsigned char *)(DECAF_ED25519_NO_CONTEXT); | ||
| } else if (!enif_inspect_binary(env, argv[2], &context) || context.size > 255) { | ||
| return EXCP_BADARG(env, "Context must be either the atom 'no_context' or a binary of size <= 255-bytes"); | ||
| } | ||
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| (void)decaf_ed25519_prehash_init(hash); | ||
| (void)decaf_ed25519_prehash_update(hash, message.data, message.size); | ||
| signature = (uint8_t *)(enif_make_new_binary(env, DECAF_EDDSA_25519_SIGNATURE_BYTES, &out)); | ||
| (void)decaf_ed25519_keypair_sign_prehash(signature, keypair->inner, hash, context.data, context.size); | ||
| (void)decaf_ed25519_prehash_destroy(hash); | ||
|
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| return out; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| // -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; st-rulers: [132] -*- | ||
| // vim: ts=4 sw=4 ft=c++ et | ||
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| #ifndef LIBDECAF_NIF_ED25519_H | ||
| #define LIBDECAF_NIF_ED25519_H | ||
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| #include "libdecaf_nif.h" | ||
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| #include <decaf/ed255.h> | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| typedef struct libdecaf_nif_ed25519_keypair_s libdecaf_nif_ed25519_keypair_t; | ||
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| struct libdecaf_nif_ed25519_keypair_s { | ||
| decaf_eddsa_25519_keypair_t inner; | ||
| }; | ||
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| extern ERL_NIF_TERM libdecaf_nif_ed25519_derive_keypair_1(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]); | ||
| extern ERL_NIF_TERM libdecaf_nif_ed25519_keypair_extract_private_key_1(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]); | ||
| extern ERL_NIF_TERM libdecaf_nif_ed25519_keypair_extract_public_key_1(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]); | ||
| extern ERL_NIF_TERM libdecaf_nif_ed25519_keypair_sign_4(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]); | ||
| extern ERL_NIF_TERM libdecaf_nif_ed25519_keypair_sign_prehash_3(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]); | ||
|
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
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| #endif |
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