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Add secp256k1_ec_pubkey_compress(), with test similar to the related decompress() function.

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This commit is contained in:
Thomas Kerin
2015-07-13 13:09:00 +01:00
parent 873a453d26
commit 99fd963bd5
3 changed files with 45 additions and 5 deletions
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21
include/secp256k1.h
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@@ -260,10 +260,27 @@ SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_create(
int compressed
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
/** Compress a public key.
* In: ctx: pointer to a context object (cannot be NULL)
* pubkeyin: pointer to a 33-byte or 65-byte public key (cannot be NULL)
* Out: pubkeyout: pointer to a 33-byte array to put the compressed public key (cannot be NULL)
* May alias pubkeyin.
* pubkeylen: pointer to the size of the public key pointed to by pubkeyin (cannot be NULL)
* It will be updated to reflect the size of the public key in pubkeyout.
* Returns: 0: pubkeyin was invalid
* 1: pubkeyin was valid, and pubkeyout is its compressed version
*/
SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_compress(
const secp256k1_context_t* ctx,
const unsigned char *pubkeyin,
unsigned char *pubkeyout,
int *pubkeylen
) 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: pubkeyin: pointer to a 33-byte or 65-byte public key (cannot be NULL)
* In/Out: pubkeyout: pointer to a 65-byte array to put the decompressed public key (cannot be NULL)
* pubkeyin: pointer to a 33-byte or 65-byte public key (cannot be NULL)
* Out: pubkeyout: pointer to a 65-byte array to put the decompressed public key (cannot be NULL)
* May alias pubkeyin.
* pubkeylen: pointer to the size of the public key pointed to by pubkeyin (cannot be NULL)
* It will be updated to reflect the size of the public key in pubkeyout.