41 lines
1.8 KiB
Python
41 lines
1.8 KiB
Python
from Cryptodome.Util._raw_api import (load_pycryptodome_raw_lib, c_size_t,
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c_uint8_ptr)
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_raw_pkcs1_decode = load_pycryptodome_raw_lib("Cryptodome.Cipher._pkcs1_decode",
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"""
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int pkcs1_decode(const uint8_t *em, size_t len_em,
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const uint8_t *sentinel, size_t len_sentinel,
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size_t expected_pt_len,
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uint8_t *output);
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int oaep_decode(const uint8_t *em,
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size_t em_len,
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const uint8_t *lHash,
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size_t hLen,
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const uint8_t *db,
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size_t db_len);
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""")
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def pkcs1_decode(em, sentinel, expected_pt_len, output):
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if len(em) != len(output):
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raise ValueError("Incorrect output length")
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ret = _raw_pkcs1_decode.pkcs1_decode(c_uint8_ptr(em),
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c_size_t(len(em)),
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c_uint8_ptr(sentinel),
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c_size_t(len(sentinel)),
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c_size_t(expected_pt_len),
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c_uint8_ptr(output))
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return ret
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def oaep_decode(em, lHash, db):
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ret = _raw_pkcs1_decode.oaep_decode(c_uint8_ptr(em),
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c_size_t(len(em)),
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c_uint8_ptr(lHash),
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c_size_t(len(lHash)),
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c_uint8_ptr(db),
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c_size_t(len(db)))
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return ret
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