mirror of https://git.matrix.org/git/olm.git
44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
void convert_curve25519_to_ed25519(
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unsigned char * public_key,
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unsigned char * signature
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) {
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fe mont_x, mont_x_minus_one, mont_x_plus_one, inv_mont_x_plus_one;
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fe one;
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fe ed_y;
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fe_frombytes(mont_x, public_key);
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fe_1(one);
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fe_sub(mont_x_minus_one, mont_x, one);
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fe_add(mont_x_plus_one, mont_x, one);
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fe_invert(inv_mont_x_plus_one, mont_x_plus_one);
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fe_mul(ed_y, mont_x_minus_one, inv_mont_x_plus_one);
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fe_tobytes(public_key, ed_y);
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public_key[31] &= 0x7F;
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public_key[31] |= (signature[63] & 0x80);
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signature[63] &= 0x7F;
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}
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void convert_ed25519_to_curve25519(
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unsigned char const * public_key,
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unsigned char * signature
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) {
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unsigned char sign_bit = public_key[31] & 0x80;
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signature[63] &= 0x7F;
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signature[63] |= sign_bit;
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}
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void ed25519_keypair(
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unsigned char * private_key,
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unsigned char * public_key
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) {
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ge_p3 A;
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private_key[0] &= 248;
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private_key[31] &= 63;
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private_key[31] |= 64;
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ge_scalarmult_base(&A, private_key);
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ge_p3_tobytes(public_key, &A);
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}
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