35 lines
1.5 KiB
C
35 lines
1.5 KiB
C
#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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/// XEd25519-signed a message given a curve25519 privkey and message. Writes the 64-byte signature
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/// to `sig` on success and returns 0. Returns non-zero on failure.
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__attribute__((warn_unused_result)) int session_xed25519_sign(
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unsigned char* signature /* 64 byte buffer */,
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const unsigned char* curve25519_privkey /* 32 bytes */,
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const unsigned char* msg,
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const unsigned int msg_len);
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/// Verifies an XEd25519-signed message given a 64-byte signature, 32-byte curve25519 pubkey, and
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/// message. Returns 0 if the signature verifies successfully, non-zero on failure.
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__attribute__((warn_unused_result)) int session_xed25519_verify(
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const unsigned char* signature /* 64 bytes */,
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const unsigned char* pubkey /* 32-bytes */,
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const unsigned char* msg,
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const unsigned int msg_len);
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/// Given a curve25519 pubkey, this writes the associated XEd25519-derived Ed25519 pubkey into
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/// ed25519_pubkey. Note, however, that there are *two* possible Ed25519 pubkeys that could result
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/// in a given curve25519 pubkey: this always returns the positive value. You can get the other
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/// possibility (the negative) by flipping the sign bit, i.e. `returned_pubkey[31] |= 0x80`.
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/// Returns 0 on success, non-0 on failure.
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__attribute__((warn_unused_result)) int session_xed25519_pubkey(
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unsigned char* ed25519_pubkey /* 32-byte output buffer */,
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const unsigned char* curve25519_pubkey /* 32 bytes */);
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#ifdef __cplusplus
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}
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#endif
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