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Diffstat (limited to '')
-rw-r--r-- | comm/third_party/botan/src/lib/pubkey/pem/pem.cpp | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/pubkey/pem/pem.cpp b/comm/third_party/botan/src/lib/pubkey/pem/pem.cpp new file mode 100644 index 0000000000..d2433860dd --- /dev/null +++ b/comm/third_party/botan/src/lib/pubkey/pem/pem.cpp @@ -0,0 +1,169 @@ +/* +* PEM Encoding/Decoding +* (C) 1999-2007 Jack Lloyd +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#include <botan/pem.h> +#include <botan/data_src.h> +#include <botan/base64.h> +#include <botan/exceptn.h> + +namespace Botan { + +namespace PEM_Code { + +namespace { + +std::string linewrap(size_t width, const std::string& in) + { + std::string out; + for(size_t i = 0; i != in.size(); ++i) + { + if(i > 0 && i % width == 0) + { + out.push_back('\n'); + } + out.push_back(in[i]); + } + if(out.size() > 0 && out[out.size()-1] != '\n') + { + out.push_back('\n'); + } + + return out; + } + +} + +/* +* PEM encode BER/DER-encoded objects +*/ +std::string encode(const uint8_t der[], size_t length, const std::string& label, size_t width) + { + const std::string PEM_HEADER = "-----BEGIN " + label + "-----\n"; + const std::string PEM_TRAILER = "-----END " + label + "-----\n"; + + return (PEM_HEADER + linewrap(width, base64_encode(der, length)) + PEM_TRAILER); + } + +/* +* Decode PEM down to raw BER/DER +*/ +secure_vector<uint8_t> decode_check_label(DataSource& source, + const std::string& label_want) + { + std::string label_got; + secure_vector<uint8_t> ber = decode(source, label_got); + if(label_got != label_want) + throw Decoding_Error("PEM: Label mismatch, wanted " + label_want + + ", got " + label_got); + return ber; + } + +/* +* Decode PEM down to raw BER/DER +*/ +secure_vector<uint8_t> decode(DataSource& source, std::string& label) + { + const size_t RANDOM_CHAR_LIMIT = 8; + + label.clear(); + + const std::string PEM_HEADER1 = "-----BEGIN "; + const std::string PEM_HEADER2 = "-----"; + size_t position = 0; + + while(position != PEM_HEADER1.length()) + { + uint8_t b; + if(!source.read_byte(b)) + throw Decoding_Error("PEM: No PEM header found"); + if(b == PEM_HEADER1[position]) + ++position; + else if(position >= RANDOM_CHAR_LIMIT) + throw Decoding_Error("PEM: Malformed PEM header"); + else + position = 0; + } + position = 0; + while(position != PEM_HEADER2.length()) + { + uint8_t b; + if(!source.read_byte(b)) + throw Decoding_Error("PEM: No PEM header found"); + if(b == PEM_HEADER2[position]) + ++position; + else if(position) + throw Decoding_Error("PEM: Malformed PEM header"); + + if(position == 0) + label += static_cast<char>(b); + } + + std::vector<char> b64; + + const std::string PEM_TRAILER = "-----END " + label + "-----"; + position = 0; + while(position != PEM_TRAILER.length()) + { + uint8_t b; + if(!source.read_byte(b)) + throw Decoding_Error("PEM: No PEM trailer found"); + if(b == PEM_TRAILER[position]) + ++position; + else if(position) + throw Decoding_Error("PEM: Malformed PEM trailer"); + + if(position == 0) + b64.push_back(b); + } + + return base64_decode(b64.data(), b64.size()); + } + +secure_vector<uint8_t> decode_check_label(const std::string& pem, + const std::string& label_want) + { + DataSource_Memory src(pem); + return decode_check_label(src, label_want); + } + +secure_vector<uint8_t> decode(const std::string& pem, std::string& label) + { + DataSource_Memory src(pem); + return decode(src, label); + } + +/* +* Search for a PEM signature +*/ +bool matches(DataSource& source, const std::string& extra, + size_t search_range) + { + const std::string PEM_HEADER = "-----BEGIN " + extra; + + secure_vector<uint8_t> search_buf(search_range); + size_t got = source.peek(search_buf.data(), search_buf.size(), 0); + + if(got < PEM_HEADER.length()) + return false; + + size_t index = 0; + + for(size_t j = 0; j != got; ++j) + { + if(search_buf[j] == PEM_HEADER[index]) + ++index; + else + index = 0; + if(index == PEM_HEADER.size()) + return true; + } + return false; + } + +} + +} |