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Merge pull request #175 from clearmatics/templatize-code
Templatize code
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| Original file line number | Diff line number | Diff line change |
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| // Copyright (c) 2015-2020 Clearmatics Technologies Ltd | ||
| // | ||
| // SPDX-License-Identifier: LGPL-3.0+ | ||
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| #ifndef __ZETH_DEBUG_HELPERS_TCC__ | ||
| #define __ZETH_DEBUG_HELPERS_TCC__ | ||
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| #include <fstream> | ||
| #include <iomanip> | ||
| #include <iostream> | ||
| #include <libff/algebra/fields/bigint.hpp> | ||
| #include <libff/common/default_types/ec_pp.hpp> | ||
| #include <sstream> | ||
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| // This file uses types and preprocessor variables defined in the `gmp.h` | ||
| // header: | ||
| // - `mp_size_t` | ||
| // - `GMP_LIMB_BITS` | ||
| // - `GMP_NAIL_BITS` | ||
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| namespace libzeth | ||
| { | ||
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| // WARNING: The following function assumes that NAILS are NOT used | ||
| // See Section 8.2 (page 68): https://gmplib.org/gmp-man-6.2.0.pdf | ||
| // In other words, we assume below that: | ||
| // - GMP_NUMB_BITS = GMP_LIMB_BITS and thus, | ||
| // - GMP_NAIL_BITS = 0 | ||
| // | ||
| // This function decomposes a bigint into an array of bytes. | ||
| // | ||
| // For instance, if the number of bits in a Limb is 64, | ||
| // and we have `input_bigint = [Limb0, Limb1, Limb2, Limb3]`, | ||
| // where every Limb{i} is of type `mp_limb_t`, then the function returns | ||
| // | ||
| // x = [x0, ..., x7, x8, ..., x15, x16, ..., x23, x24, ..., x31] | ||
| // ^ ^ ^ ^ ^ ^ ^ ^ | ||
| // |_______| |________| |_________| |_________| | ||
| // | | | | | ||
| // Limb3 Limb2 Limb1 Limb0 | ||
| // | ||
| // where all x_i's are bytes (uint8_t) | ||
| template<typename FieldT> | ||
| std::string hex_from_libsnark_bigint( | ||
| const libff::bigint<FieldT::num_limbs> &limbs) | ||
| { | ||
| const unsigned bytes_per_limb = (GMP_LIMB_BITS + 8 - 1) / 8; | ||
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| uint8_t x[bytes_per_limb * FieldT::num_limbs]; | ||
| for (unsigned i = 0; i < FieldT::num_limbs; i++) { | ||
| for (unsigned j = 0; j < bytes_per_limb; j++) { | ||
| x[i * 8 + j] = uint8_t( | ||
| uint64_t(limbs.data[(FieldT::num_limbs - 1) - i]) >> | ||
| (GMP_LIMB_BITS - 8 * (j + 1))); | ||
| } | ||
| } | ||
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| std::stringstream ss; | ||
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| // Display every byte as 2 hexadecimal characters | ||
| ss << std::setfill('0'); | ||
| for (unsigned i = 0; i < bytes_per_limb * FieldT::num_limbs; i++) { | ||
| ss << std::hex << std::setw(2) << (int)x[i]; | ||
| } | ||
| std::string str = ss.str(); | ||
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| // Remove leading 0's | ||
| return str.erase(0, std::min(str.find_first_not_of('0'), str.size() - 1)); | ||
| } | ||
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| // WARNING: The following function assumes that NAILS are NOT used | ||
| // See Section 8.2 (page 68): https://gmplib.org/gmp-man-6.2.0.pdf | ||
| // In other words, we assume below that: | ||
| // - GMP_NUMB_BITS = GMP_LIMB_BITS and thus, | ||
| // - GMP_NAIL_BITS = 0 | ||
| // | ||
| // This function recomposes a bigint from an array of bytes. | ||
| // | ||
| // For instance, if the number of bits in a Limb is 64, and we have as input: | ||
| // x = [x0, ..., x7, x8, ..., x15, x16, ..., x23, x24, ..., x31] | ||
| // ^ ^ ^ ^ ^ ^ ^ ^ | ||
| // |_______| |________| |_________| |_________| | ||
| // | | | | | ||
| // Limb3 Limb2 Limb1 Limb0 | ||
| // where all x_i's are bytes (uint8_t) | ||
| // | ||
| // then the function returns: | ||
| // and we have `res_bigint = [Limb0, Limb1, Limb2, Limb3]`, | ||
| // where every Limb{i} is of type `mp_limb_t`, | ||
| template<typename FieldT> | ||
| libff::bigint<FieldT::num_limbs> libsnark_bigint_from_bytes( | ||
| const uint8_t bytes[(FieldT::num_bits + 8 - 1) / 8]) | ||
| { | ||
| const unsigned bytes_per_limb = (GMP_LIMB_BITS + 8 - 1) / 8; | ||
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| libff::bigint<FieldT::num_limbs> res; | ||
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| for (unsigned i = 0; i < FieldT::num_limbs; i++) { | ||
| for (unsigned j = 0; j < bytes_per_limb; j++) { | ||
| res.data[FieldT::num_limbs - i] |= mp_limb_t(bytes[i * 8 + j]) | ||
| << (GMP_LIMB_BITS - 8 * (j + 1)); | ||
| } | ||
| } | ||
| return res; | ||
| } | ||
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| template<typename ppT> | ||
| std::string point_g1_affine_as_hex(const libff::G1<ppT> &point) | ||
| { | ||
| libff::G1<ppT> affine_p = point; | ||
| affine_p.to_affine_coordinates(); | ||
| return "\"0x" + | ||
| hex_from_libsnark_bigint<libff::Fq<ppT>>(affine_p.X.as_bigint()) + | ||
| "\", \"0x" + | ||
| hex_from_libsnark_bigint<libff::Fq<ppT>>(affine_p.Y.as_bigint()) + | ||
| "\""; | ||
| } | ||
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| template<typename ppT> | ||
| std::string point_g2_affine_as_hex(const libff::G2<ppT> &point) | ||
| { | ||
| libff::G2<ppT> affine_p = point; | ||
| affine_p.to_affine_coordinates(); | ||
| return "[\"0x" + | ||
| hex_from_libsnark_bigint<libff::Fq<ppT>>(affine_p.X.c1.as_bigint()) + | ||
| "\", \"0x" + | ||
| hex_from_libsnark_bigint<libff::Fq<ppT>>(affine_p.X.c0.as_bigint()) + | ||
| "\"],\n [\"0x" + | ||
| hex_from_libsnark_bigint<libff::Fq<ppT>>(affine_p.Y.c1.as_bigint()) + | ||
| "\", \"0x" + | ||
| hex_from_libsnark_bigint<libff::Fq<ppT>>(affine_p.Y.c0.as_bigint()) + | ||
| "\"]"; | ||
| } | ||
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| } // namespace libzeth | ||
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| #endif // __ZETH_DEBUG_HELPERS_TCC__ |
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