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Squashed 'src/secp256k1/' changes from 1897b8e..22f60a6

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22f60a6 Merge pull request #245
61c1b1e Merge pull request #190
d227579 Add scalar blinding and a secp256k1_context_randomize() call.
c146b4a Add bench_internal to gitignore.
9c4fb23 Add a secp256k1_fe_cmov unit test.
426fa52 Merge pull request #243
d505a89 Merge pull request #244
2d2707a travis: test i686 builds with gmp
cf7f702 travis: update to new build infrastructure
bb0ea50 Replace set/add with cmov in secp256k1_gej_add_ge.
f3d3519 Merge pull request #241
5c2a4fa Fix memory leak in context unit test
14aacdc Merge pull request #239
93226a5 secp256k1.c: Add missing DEBUG_CHECKs for sufficiently capable contexts
6099220 Merge pull request #237
6066bb6 Fix typo: avg -> max
9688030 Merge pull request #236
d899b5b Expose ability to deep-copy a context
3608c7f Merge pull request #208
a9b6595 [API BREAK] Introduce explicit contexts
a0d3b89 Merge pull request #233
9e8d89b Merge pull request #234
65e70e7 Merge pull request #235
5098f62 Improve documentation formatting consistency
4450e24 Add a comment about the avoidance of secret data in array indexes.
6534ee1 initialize variable
d5b53aa Merge pull request #232
c01df1a Avoid some implicit type conversions to make C++ compilers happy.
bfe96ba Merge pull request #231
33270bf Add a couple comments pointing to particular sections of RFC6979.
41603aa Merge pull request #230
2632019 Brace all the if/for/while.

git-subtree-dir: src/secp256k1
git-subtree-split: 22f60a62801a8a49ecd049e7a563f69a41affd8d
This commit is contained in:
Pieter Wuille
2015-04-22 14:03:10 -07:00
parent 9d09322b41
commit a591d98c32
26 changed files with 1160 additions and 474 deletions
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154
include/secp256k1.h
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@@ -40,42 +40,60 @@ extern "C" {
# define SECP256K1_ARG_NONNULL(_x)
# endif
/** Flags to pass to secp256k1_start. */
# define SECP256K1_START_VERIFY (1 << 0)
# define SECP256K1_START_SIGN (1 << 1)
/** Initialize the library. This may take some time (10-100 ms).
* You need to call this before calling any other function.
* It cannot run in parallel with any other functions, but once
* secp256k1_start() returns, all other functions are thread-safe.
/** Opaque data structure that holds context information (precomputed tables etc.).
* Only functions that take a pointer to a non-const context require exclusive
* access to it. Multiple functions that take a pointer to a const context may
* run simultaneously.
*/
void secp256k1_start(unsigned int flags);
typedef struct secp256k1_context_struct secp256k1_context_t;
/** Free all memory associated with this library. After this, no
* functions can be called anymore, except secp256k1_start()
/** Flags to pass to secp256k1_context_create. */
# define SECP256K1_CONTEXT_VERIFY (1 << 0)
# define SECP256K1_CONTEXT_SIGN (1 << 1)
/** Create a secp256k1 context object.
* Returns: a newly created context object.
* In: flags: which parts of the context to initialize.
*/
void secp256k1_stop(void);
secp256k1_context_t* secp256k1_context_create(
int flags
) SECP256K1_WARN_UNUSED_RESULT;
/** Copies a secp256k1 context object.
* Returns: a newly created context object.
* In: ctx: an existing context to copy
*/
secp256k1_context_t* secp256k1_context_clone(
const secp256k1_context_t* ctx
) SECP256K1_WARN_UNUSED_RESULT;
/** Destroy a secp256k1 context object.
* The context pointer may not be used afterwards.
*/
void secp256k1_context_destroy(
secp256k1_context_t* ctx
) SECP256K1_ARG_NONNULL(1);
/** Verify an ECDSA signature.
* Returns: 1: correct signature
* 0: incorrect signature
* -1: invalid public key
* -2: invalid signature
* In: msg32: the 32-byte message hash being verified (cannot be NULL)
* In: ctx: a secp256k1 context object, initialized for verification.
* msg32: the 32-byte message hash being verified (cannot be NULL)
* sig: the signature being verified (cannot be NULL)
* siglen: the length of the signature
* pubkey: the public key to verify with (cannot be NULL)
* pubkeylen: the length of pubkey
* Requires starting using SECP256K1_START_VERIFY.
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdsa_verify(
const secp256k1_context_t* ctx,
const unsigned char *msg32,
const unsigned char *sig,
int siglen,
const unsigned char *pubkey,
int pubkeylen
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(4);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(5);
/** A pointer to a function to deterministically generate a nonce.
* Returns: 1 if a nonce was successfully generated. 0 will cause signing to fail.
@@ -111,15 +129,14 @@ extern const secp256k1_nonce_function_t secp256k1_nonce_function_default;
* Returns: 1: signature created
* 0: the nonce generation function failed, the private key was invalid, or there is not
* enough space in the signature (as indicated by siglen).
* In: msg32: the 32-byte message hash being signed (cannot be NULL)
* 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)
* In/Out: siglen: pointer to an int with the length of sig, which will be updated
* to contain the actual signature length (<=72). If 0 is returned, this will be
* set to zero.
* Requires starting using SECP256K1_START_SIGN.
* to contain the actual signature length (<=72).
*
* The sig always has an s value in the lower half of the range (From 0x1
* to 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0,
@@ -148,145 +165,180 @@ extern const secp256k1_nonce_function_t secp256k1_nonce_function_default;
* be taken when this property is required for an application.
*/
int secp256k1_ecdsa_sign(
const secp256k1_context_t* ctx,
const unsigned char *msg32,
unsigned char *sig,
int *siglen,
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);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4) SECP256K1_ARG_NONNULL(5);
/** Create a compact ECDSA signature (64 byte + recovery id).
* Returns: 1: signature created
* 0: the nonce generation function failed, or the secret key was invalid.
* In: msg32: the 32-byte message hash being signed (cannot be NULL)
* 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 a 64-byte array where the signature will be placed (cannot be NULL)
* In case 0 is returned, the returned signature length will be zero.
* recid: pointer to an int, which will be updated to contain the recovery id (can be NULL)
* Requires starting using SECP256K1_START_SIGN.
*/
int secp256k1_ecdsa_sign_compact(
const secp256k1_context_t* ctx,
const unsigned char *msg32,
unsigned char *sig64,
const unsigned char *seckey,
secp256k1_nonce_function_t noncefp,
const void *ndata,
int *recid
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
/** Recover an ECDSA public key from a compact signature.
* Returns: 1: public key successfully recovered (which guarantees a correct signature).
* 0: otherwise.
* In: msg32: the 32-byte message hash assumed to be signed (cannot be NULL)
* 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)
* sig64: signature as 64 byte array (cannot be NULL)
* compressed: whether to recover a compressed or uncompressed pubkey
* recid: the recovery id (0-3, as returned by ecdsa_sign_compact)
* Out: pubkey: pointer to a 33 or 65 byte array to put the pubkey (cannot be NULL)
* pubkeylen: pointer to an int that will contain the pubkey length (cannot be NULL)
* Requires starting using SECP256K1_START_VERIFY.
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ecdsa_recover_compact(
const secp256k1_context_t* ctx,
const unsigned char *msg32,
const unsigned char *sig64,
unsigned char *pubkey,
int *pubkeylen,
int compressed,
int recid
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4) SECP256K1_ARG_NONNULL(5);
/** Verify an ECDSA secret key.
* Returns: 1: secret key is valid
* 0: secret key is invalid
* In: seckey: pointer to a 32-byte secret key (cannot be NULL)
* In: ctx: pointer to a context object (cannot be NULL)
* seckey: pointer to a 32-byte secret key (cannot be NULL)
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_verify(const unsigned char *seckey) SECP256K1_ARG_NONNULL(1);
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_seckey_verify(
const secp256k1_context_t* ctx,
const unsigned char *seckey
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
/** Just validate a public key.
* Returns: 1: valid public key
* 0: invalid public key
* In: pubkey: pointer to a 33-byte or 65-byte public key (cannot be NULL).
* Returns: 1: public key is valid
* 0: public key is invalid
* In: ctx: pointer to a context object (cannot be NULL)
* pubkey: pointer to a 33-byte or 65-byte public key (cannot be NULL).
* pubkeylen: length of pubkey
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_verify(const unsigned char *pubkey, int pubkeylen) SECP256K1_ARG_NONNULL(1);
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_verify(
const secp256k1_context_t* ctx,
const unsigned char *pubkey,
int pubkeylen
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
/** Compute the public key for a secret key.
* In: compressed: whether the computed public key should be compressed
* In: ctx: pointer to a context object, initialized for signing (cannot be NULL)
* compressed: whether the computed public key should be compressed
* seckey: pointer to a 32-byte private key (cannot be NULL)
* Out: pubkey: pointer to a 33-byte (if compressed) or 65-byte (if uncompressed)
* area to store the public key (cannot be NULL)
* pubkeylen: pointer to int that will be updated to contains the pubkey's
* length (cannot be NULL)
* Returns: 1: secret was valid, public key stores
* 0: secret was invalid, try again.
* Requires starting using SECP256K1_START_SIGN.
* 0: secret was invalid, try again
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_create(
const secp256k1_context_t* ctx,
unsigned char *pubkey,
int *pubkeylen,
const unsigned char *seckey,
int compressed
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
/** Decompress a public key.
* In: ctx: pointer to a context object (cannot be NULL)
* In/Out: pubkey: pointer to a 65-byte array to put the decompressed public key.
It must contain a 33-byte or 65-byte public key already (cannot be NULL)
* It must contain a 33-byte or 65-byte public key already (cannot be NULL)
* pubkeylen: pointer to the size of the public key pointed to by pubkey (cannot be NULL)
It will be updated to reflect the new size.
* Returns: 0 if the passed public key was invalid, 1 otherwise. If 1 is returned, the
pubkey is replaced with its decompressed version.
* It will be updated to reflect the new size.
* Returns: 0: pubkey was invalid
* 1: pubkey was valid, and was replaced with its decompressed version
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_decompress(
const secp256k1_context_t* ctx,
unsigned char *pubkey,
int *pubkeylen
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
/** Export a private key in DER format. */
/** Export a private key in DER format.
* In: ctx: pointer to a context object, initialized for signing (cannot be NULL)
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_export(
const secp256k1_context_t* ctx,
const unsigned char *seckey,
unsigned char *privkey,
int *privkeylen,
int compressed
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
/** Import a private key in DER format. */
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_import(
const secp256k1_context_t* ctx,
unsigned char *seckey,
const unsigned char *privkey,
int privkeylen
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
/** Tweak a private key by adding tweak to it. */
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_tweak_add(
const secp256k1_context_t* ctx,
unsigned char *seckey,
const unsigned char *tweak
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
/** Tweak a public key by adding tweak times the generator to it.
* Requires starting with SECP256K1_START_VERIFY.
* In: ctx: pointer to a context object, initialized for verification (cannot be NULL)
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_tweak_add(
const secp256k1_context_t* ctx,
unsigned char *pubkey,
int pubkeylen,
const unsigned char *tweak
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(3);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(4);
/** Tweak a private key by multiplying it with tweak. */
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_tweak_mul(
const secp256k1_context_t* ctx,
unsigned char *seckey,
const unsigned char *tweak
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3);
/** Tweak a public key by multiplying it with tweak.
* Requires starting with SECP256K1_START_VERIFY.
* In: ctx: pointer to a context object, initialized for verification (cannot be NULL)
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_tweak_mul(
const secp256k1_context_t* ctx,
unsigned char *pubkey,
int pubkeylen,
const unsigned char *tweak
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(3);
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(4);
/** Updates the context randomization.
* Returns: 1: randomization successfully updated
* 0: error
* In: ctx: pointer to a context object (cannot be NULL)
* seed32: pointer to a 32-byte random seed (NULL resets to initial state)
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_context_randomize(
secp256k1_context_t* ctx,
const unsigned char *seed32
) SECP256K1_ARG_NONNULL(1);
# ifdef __cplusplus
}