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9f443be Move pubkey recovery code to separate module (Pieter Wuille) d49abbd Separate ECDSA recovery tests (Pieter Wuille) 439d34a Separate recoverable and normal signatures (Pieter Wuille)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| #ifndef _SECP256K1_RECOVERY_ | ||
| # define _SECP256K1_RECOVERY_ | ||
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| # include "secp256k1.h" | ||
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| # ifdef __cplusplus | ||
| extern "C" { | ||
| # endif | ||
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| /** Opaque data structured that holds a parsed ECDSA signature, | ||
| * supporting pubkey recovery. | ||
| * | ||
| * The exact representation of data inside is implementation defined and not | ||
| * guaranteed to be portable between different platforms or versions. It is | ||
| * however guaranteed to be 65 bytes in size, and can be safely copied/moved. | ||
| * If you need to convert to a format suitable for storage or transmission, use | ||
| * the secp256k1_ecdsa_signature_serialize_* and | ||
| * secp256k1_ecdsa_signature_serialize_* functions. | ||
| * | ||
| * Furthermore, it is guaranteed to identical signatures (including their | ||
| * recoverability) will have identical representation, so they can be | ||
| * memcmp'ed. | ||
| */ | ||
| typedef struct { | ||
| unsigned char data[65]; | ||
| } secp256k1_ecdsa_recoverable_signature_t; | ||
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| /** Parse a compact ECDSA signature (64 bytes + recovery id). | ||
| * | ||
| * Returns: 1 when the signature could be parsed, 0 otherwise | ||
| * In: ctx: a secp256k1 context object | ||
| * input64: a pointer to a 64-byte compact signature | ||
| * recid: the recovery id (0, 1, 2 or 3) | ||
| * Out: sig: a pointer to a signature object | ||
| */ | ||
| int secp256k1_ecdsa_recoverable_signature_parse_compact( | ||
| const secp256k1_context_t* ctx, | ||
| secp256k1_ecdsa_recoverable_signature_t* sig, | ||
| const unsigned char *input64, | ||
| int recid | ||
| ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3); | ||
|
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| /** Convert a recoverable signature into a normal signature. | ||
| * | ||
| * Returns: 1 | ||
| * In: sigin: a pointer to a recoverable signature (cannot be NULL). | ||
| * Out: sig: a pointer to a normal signature (cannot be NULL). | ||
| */ | ||
| int secp256k1_ecdsa_recoverable_signature_convert( | ||
| const secp256k1_context_t* ctx, | ||
| secp256k1_ecdsa_signature_t* sig, | ||
| const secp256k1_ecdsa_recoverable_signature_t* sigin | ||
| ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3); | ||
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| /** Serialize an ECDSA signature in compact format (64 bytes + recovery id). | ||
| * | ||
| * Returns: 1 | ||
| * In: ctx: a secp256k1 context object | ||
| * sig: a pointer to an initialized signature object (cannot be NULL) | ||
| * Out: output64: a pointer to a 64-byte array of the compact signature (cannot be NULL) | ||
| * recid: a pointer to an integer to hold the recovery id (can be NULL). | ||
| */ | ||
| int secp256k1_ecdsa_recoverable_signature_serialize_compact( | ||
| const secp256k1_context_t* ctx, | ||
| unsigned char *output64, | ||
| int *recid, | ||
| const secp256k1_ecdsa_recoverable_signature_t* sig | ||
| ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(4); | ||
|
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| /** Create a recoverable ECDSA signature. | ||
| * | ||
| * Returns: 1: signature created | ||
| * 0: the nonce generation function failed, or the private key was invalid. | ||
| * In: ctx: pointer to a context object, initialized for signing (cannot be NULL) | ||
| * msg32: the 32-byte message hash being signed (cannot be NULL) | ||
| * seckey: pointer to a 32-byte secret key (cannot be NULL) | ||
| * noncefp:pointer to a nonce generation function. If NULL, secp256k1_nonce_function_default is used | ||
| * ndata: pointer to arbitrary data used by the nonce generation function (can be NULL) | ||
| * Out: sig: pointer to an array where the signature will be placed (cannot be NULL) | ||
| */ | ||
| int secp256k1_ecdsa_sign_recoverable( | ||
| const secp256k1_context_t* ctx, | ||
| const unsigned char *msg32, | ||
| secp256k1_ecdsa_recoverable_signature_t *sig, | ||
| const unsigned char *seckey, | ||
| secp256k1_nonce_function_t noncefp, | ||
| const void *ndata | ||
| ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4); | ||
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| /** Recover an ECDSA public key from a signature. | ||
| * | ||
| * Returns: 1: public key successfully recovered (which guarantees a correct signature). | ||
| * 0: otherwise. | ||
| * In: ctx: pointer to a context object, initialized for verification (cannot be NULL) | ||
| * msg32: the 32-byte message hash assumed to be signed (cannot be NULL) | ||
| * sig: pointer to initialized signature that supports pubkey recovery (cannot be NULL) | ||
| * Out: pubkey: pointer to the recoved public key (cannot be NULL) | ||
| */ | ||
| SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdsa_recover( | ||
| const secp256k1_context_t* ctx, | ||
| const unsigned char *msg32, | ||
| const secp256k1_ecdsa_recoverable_signature_t *sig, | ||
| secp256k1_pubkey_t *pubkey | ||
| ) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4); | ||
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| # ifdef __cplusplus | ||
| } | ||
| # endif | ||
|
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||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| include_HEADERS += include/secp256k1_recovery.h | ||
| noinst_HEADERS += src/modules/recovery/main_impl.h | ||
| noinst_HEADERS += src/modules/recovery/tests_impl.h | ||
| if USE_BENCHMARK | ||
| noinst_PROGRAMS += bench_recover | ||
| bench_recover_SOURCES = src/bench_recover.c | ||
| bench_recover_LDADD = libsecp256k1.la $(SECP_LIBS) | ||
| bench_recover_LDFLAGS = -static | ||
| endif |
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